Magnum Energy MMS Series User manual

Owner’s Manual
MMS Series
Inverters/Chargers

© 2017 Sensata Technologies i
Disclaimer of Liability
The use of this manual and the conditions or methods of installation,
operation, use, and maintenance of the MMS Series inverter/
charger are beyond the control of Sensata Technologies. Therefore,
this company assumes no responsibility and expressly disclaims
any liability for loss, damage, or expense whether direct, indirect,
consequential, or incidental that may arise out of or be in any way
connected with such installation, operation, use, or maintenance.
Due to continuous improvements and product updates, the images
shown in this manual may not exactly match the unit purchased.
Restrictions on Use
The MMS Series inverter/charger may only be used in life support
devices or systems with the express written approval of Sensata.
Failure of this inverter can reasonably be expected to cause the
failure of that life support device or system, or to affect the safety
or effectiveness of that device or system. If the MMS Series inverter
fails, it is reasonable to assume that the health of the user or other
persons may be endangered.
Copyright Notice
Copyright © 2017 by Sensata Technologies. All rights reserved.
Permission to copy, distribute, and/or modify this document is
prohibited without express written permission from Sensata.
Document Information
Description – MMS Series Owner’s Manual
Part Number and Revision – 64-0036 Rev C
Date Published – April 2017
This entire manual is available for download—with many of the
diagrams in color—on our website at: www.SensataPower.com
Contact Information
For Magnum Energy products:
Sensata Technologies
Phone: [phone]
Fax: [phone]
www.SensataPower.com
Record the unit’s model and serial number in case you need to
provide this information in the future.
Model: Serial Number:
MMS1012 WU1/U1
MMS1012-G WU1/U1

© 2017 Sensata Technologies
ii
Conventions Used in this Manual (terminology)
Shorepower or External AC power – refers to alternating current
(AC) provided by the utility electric power grid or from a generator.
Mobile application – refers to inverters used in a recreational vehicle
(RV), boat, or a truck installation.
Safety Symbols
To reduce the risk of electrical shock, fire, or other safety hazard, the
following safety symbols have been placed throughout this manual
to indicate dangerous and important safety instructions.
WARNING: This symbol indicates that failure to take a
specified action could result in physical harm to the user.
CAUTION: This symbol indicates that failure to take a
specified action could result in damage to the equipment.
Info: This symbol indicates information that emphasizes
or supplements important points of the main text.
IMPORTANT PRODUCT SAFETY INSTRUCTIONS
This manual contains important safety instructions that must be
followed during the installation and operation of this product. Read
all instructions and safety information contained in this manual before
installing or using this product.
• All electrical work must be performed in accordance with local,
state, and federal electrical codes.
• This product is designed for indoor/compartment installation.
DO NOT expose to rain, snow, moisture, or liquids of any type.
• Use insulated tools to reduce the chance of electrical shock or
accidental short circuits.
• Remove all jewelry (such as rings, watches, bracelets, etc.,) when
installing or performing maintenance on the inverter.
• Always disconnect the batteries or energy source prior to installing
or performing maintenance on the inverter. Live power may be
present at more than one point since an inverter utilizes both
batteries and AC. Turning off the inverter may not reduce this
risk. As long as AC power is connected, it will pass through the
inverter regardless of the ON/OFF power switch setting.
• Always verify proper wiring prior to starting the inverter.
• Do not operate the inverter if it has been damaged.
• Do not dismantle the inverter; there are no user-serviceable parts
contained in this product. Attempting to service the unit yourself
could cause electrical shock. Internal capacitors remain charged
after all power is disconnected.
Safety Instructions

© 2017 Sensata Technologies iii
• Ensure all conductor insulation is of a type that is approved for
the voltage, operation, temperature, and location of use.
• No AC or DC disconnects are provided as an integral part of this
inverter. Both AC and DC disconnects must be provided as part
of the system installation.
• No overcurrent protection for the battery supply is provided as
an integral part of this inverter. Overcurrent protection of the
battery cables must be provided as part of the installation.
• No overcurrent protection for the AC output wiring is provided
as an integral part of this inverter. Overcurrent protection of the
AC output wiring must be provided as part of the installation.
IMPORTANT BATTERY SAFETY INSTRUCTIONS
• Wear eye protection (safety glasses) when working with batteries.
• Remove all jewelry such as rings, watches, bracelets, etc., when
installing or performing maintenance on the batteries.
• Never work alone. Always have someone near you when working
around batteries.
• Use proper lifting techniques when working with batteries.
• Never use old or untested batteries. Check each battery’s label
for age, type, and date code to ensure all batteries are identical.
• Batteries are sensitive to changes in temperature. Always install
batteries in a stable environment.
• Install batteries in a well ventilated area. Batteries can produce
explosive gasses. For compartment or enclosure installations,
always vent batteries to the outside.
• Provide at least one inch (2.5 cm) of air space between batteries
to provide optimum cooling.
• Never smoke when in the vicinity of batteries.
• To prevent a spark at the battery and to reduce the chance of
explosion, always connect the cables to the batteries first. Then
connect the cables to the inverter.
• Use insulated tools at all times.
• Always verify proper polarity and voltage before connecting the
batteries to the inverter.
• To reduce the chance of fire or explosion, do not short-circuit
the batteries.
• In the event of accidental exposure to battery acid, wash
thoroughly with soap and water. In the event of exposure to the
eyes, flood them for at least 15 minutes with running water and
seek immediate medical attention.
• Recycle old batteries.
SAVE ALL INSTRUCTIONS
Safety Instructions

© 2017 Sensata Technologies
iv
Symboles de sécurité
Afin de réduire les risques de choc électrique, d’incendie ou d’autres
risques pour la sécurité, les symboles de sécurité suivants ont été
placés tout au long de ce manuel pour indiquer les consignes de
sécurité dangereuses et importantes.
AVERTISSEMENT: Ce symbole indique que le défaut
de prendre une action spécifiée pourraitcauser des
dommages physiques à l’utilisateur.
ATTENTION: Ce symbole indique que le défaut de
prendre une action spécifiée peut entraîner des dommages
à l’équipement.
Info: Ce symbole indique une information qui met
l’accent ou des suppléments points importants du texte
principal.
CONSIGNES DE SÉCURITÉ IMPORTANTES
Ce manuel contient des consignes de sécurité importantes qui doivent
être respectées pendant l’installation et l’utilisation de ce produit.
Lisez toutes les instructions et informations de sécurité contenues
dans ce manuel avant d’installer ou d’utiliser ce produit.
• Tous les travaux électriques doivent être effectués conformément
aux codes électriques locaux, provinciaux et fédéraux.
• Ce produit est conçu pour l’installation à l’intérieur ou dans le
compartiment. NE PAS exposer à la pluie, à la neige, à l’humidité
ou à des liquides de tout type.
• Utilisez des outils isolés pour réduire les risques de choc électrique
ou de court-circuit accidentel.
• Enlevez tous les bijoux (tels que bagues, montres, bracelets, etc.)
lors de l’installation ou de la maintenance de l’onduleur.
• Débranchez toujours les piles ou la source d’énergie avant
d’installer ou d’effectuer l’entretien sur l’onduleur. La puissance
active peut être présente à plus d’un point, car un onduleur utilise
les deux batteries et AC. La mise hors tension de l’onduleur peut
ne pas réduire ce risque. Tant que l’alimentation CA est connectée,
elle passera par l’onduleur indépendamment du réglage du
commutateur ON/OFF.
• Vérifiez toujours le bon câblage avant le démarrage de l’onduleur.
• Ne pas faire fonctionner l’onduleur s’il a été endommagé.
• Ne démontez pas l’onduleur; Il n’y a pas de pièces réparables
par l’utilisateur contenues dans ce produit. Si vous essayez de
réparer l’appareil vous-même, vous risquez de provoquer un choc
électrique. Les condensateurs internes restent chargés après la
coupure de l’alimentation.
Safety Instructions

© 2017 Sensata Technologies v
• Assurez-vous que tous les isolateurs de conducteurs sont
approuvés pour la tension, le fonctionnement, la température et
le lieu d’utilisation.
• Aucune déconnexion AC ou DC n’est fournie en tant que partie
intégrante de cet onduleur. Les deux disjoncteurs AC et DC doivent
être fournis dans le cadre de l’installation du système.
• Aucune protection contre les surintensités n’est fournie en tant
que partie intégrante de cet onduleur. La protection contre les
surintensités des câbles de la batterie doit être fournie dans le
cadre de l’installation.
• Aucune protection contre les surintensités pour le câblage de
sortie CA n’est fournie en tant que partie intégrante de cet
onduleur. La protection contre les surintensités du câblage de
sortie CA doit être fournie dans le cadre de l’installation.
CONSIGNES DE SÉCURITÉ IMPORTANTES
• Porter des lunettes de sécurité lorsque vous travaillez avec des
piles.
• Retirez tous les bijoux tels que bagues, montres, bracelets, etc,
lors de l’installation ou d’effectuer l’entretien sur les batteries.
• Ne jamais travailler seul. Toujours avoir quelqu’un près de vous
lorsque vous travaillez autour des piles.
• Utilisez des techniques de levage appropriées lorsque vous
travaillez avec des piles.
• N’utilisez jamais de piles usées ou non testées. Vérifiez chaque
étiquette des piles pour l’âge, le type et le code de date pour
s’assurer que toutes les piles sont identiques.
• Les batteries sont sensibles aux variations de température.
Installez toujours les piles dans un environnement stable.
• Installez les piles dans un endroit bien ventilé. Les piles peuvent
produire des gaz explosifs. Pour les installations de compartiment
ou d’enceinte, évacuez toujours les piles vers l’extérieur.Provide
at least 2.5 cm (1 in.) of air space between batteries to provide
optimum cooling.
• Ne jamais fumer à proximité des piles.
• Pour éviter une étincelle à la batterie et pour réduire les risques
d’explosion, branchez toujours les câbles aux piles en premier.
Connectez ensuite les câbles à l’onduleur.Use insulated tools at
all times.
• Vérifiez toujours la polarité et la tension avant de connecter les
piles au variateur.
• Pour réduire les risques d’incendie ou d’explosion, ne pas court-
circuiter les piles.
Safety Instructions

© 2017 Sensata Technologies
vi
Safety Instructions
• En cas d’exposition accidentelle à l’acide de la batterie, laver à
fond avec de l’eau et du savon. En cas d’exposition aux yeux, les
inonder pendant au moins 15 minutes avec de l’eau courante et
consulter un médecin.
• Recyclez les vieilles batteries.
CONSERVER CES INSTRUCTIONS

© 2017 Sensata Technologies vii
Table of Contents
1.0 Introduction................................................................1
1.1 MMS Series Models................................................... 1
1.2 How an Inverter/Charger Works ................................. 2
1.3 Pure Sine Wave vs Modified Sine Wave........................ 2
1.4 Appliances and Run Time .......................................... 2
1.5 Standard Features and Benefits ................................. 3
1.5.1 Battery Temperature Sensor ................................... 6
2.0 Installation .................................................................7
2.1 Pre-Installation ........................................................ 7
2.1.1 Unpacking and Inspection ...................................... 7
2.1.2 Locating and Mounting the Inverter ......................... 7
2.1.3 Wiring Guidelines .................................................12
2.2 DC Wiring ..............................................................14
2.2.1 DC Wire Sizing ....................................................14
2.2.2 DC Overcurrent Protection.....................................14
2.2.3 DC Grounding......................................................15
2.2.4 DC Cable Connections...........................................17
2.3 Battery Bank Wiring ................................................18
2.3.1 Inverter to Battery Bank Wiring .............................19
2.4 AC Wiring (MMS1012 model only) .............................21
2.4.1 Pre-AC Wiring Requirements..................................21
2.4.2 AC Wire Size and Overcurrent Protection.................21
2.4.3 Ground-Fault Circuit Interruption (GFCI) Breakers ....22
2.4.4 AC Wiring Connections..........................................23
2.4.5 AC Input Wiring ...................................................23
2.4.6 AC Output Wiring .................................................24
2.5 Grounding Inverters ................................................25
2.5.1 Neutral to Safety Ground Bonding ..........................25
2.5.2 Disabling the Neutral-to-Ground Connection ............27
2.6 Inverter Warning Label ............................................28
2.7 Functional Test .......................................................28
3.0 Operation..................................................................30
3.1 Operating Modes.....................................................30
3.1.1 Inverter Mode......................................................30
3.1.2 Standby Mode .....................................................31
3.2 Battery Temperature Sensor Operation.......................34
3.3 Protection Circuitry Operation ...................................35
3.4 Inverter Startup......................................................36
3.5 Factory Default Settings...........................................37
4.0 Maintenance and Troubleshooting ............................39
4.1 Recommended Inverter and Battery Care ...................39
4.2 RV/Marine Off-Season Storage..................................39
Table of Contents

© 2017 Sensata Technologies
viii
List of Tables
Table 2-1, Wire/Overcurrent Device ........................................16
Table 2-2, Minimum Wire Size to Circuit-breaker Size ................22
Table 2-3, Wire Color to AC Wire Connection ............................22
Table 3-1, Inverter Battery Turn On/Off Levels..........................36
Table 3-2, Inverter/Charger Default Settings ............................38
Table 4-1, Troubleshooting Guide ............................................40
Table 5-1, MMS Series Specifications.......................................42
List of Figures
Figure 1-1, MMS1012 Model Inverter/Charger ........................... 1
Figure 1-2, MMS1012-G Model Inverter/Charger........................ 1
Figure 1-3, Top and Left Side Features ..................................... 4
Figure 1-4, Front and Back Side Features.................................. 5
Figure 1-5, Battery Temperature Sensor (BTS) .......................... 6
Figure 2-1, MMS1012 Model Basic Installation Diagram .............. 8
Figure 2-2, MMS1012-G Model Basic Installation Diagram ........... 9
Figure 2-3, Approved MMS1012 (-G) Mounting Orientations ......11
Figure 2-4, MMS1012 Model Dimensions..................................12
Figure 2-5, MMS1012-G Model Dimensions ..............................13
Figure 2-6, DC Cable to Battery Terminals................................17
Figure 2-7, DC Cable to Inverter’s DC Terminals .......................18
Figure 2-8, Battery String Connections ....................................20
Figure 2-9, AC Wiring Connections (MMS1012 model) ...............24
Figure 2-10, Neutral-to-Ground Connection (Inverter Mode).......26
Figure 2-11, Neutral-to-Ground Connection (Standby Mode).......26
Figure 2-12, Disconnecting Neutral-to-Ground Connection .........27
Figure 2-13, Warning Label ....................................................28
Figure 3-1, Automatic 4-Stage Charging Graph.........................33
Figure 3-2, BTS Temperature to Charge Voltage Change ............34
Figure B-1, Series Battery Wiring............................................44
Figure B-2, Parallel Battery Wiring ..........................................45
Figure B-3, Series-Parallel Battery Wiring.................................45
Figure B-4, Battery Bank Wiring Examples (12-volt)..................46
Table of Contents (cont.)
4.3 Resetting the Inverter..............................................39
4.4 Troubleshooting ......................................................40
5.0 Specifications............................................................42
A-1 Optional Equipment and Accessories.........................43
B-1 Battery Information..................................................44
C-1 Warranty/Service Information..................................47
C-1.1 Limited Warranty ....................................................47
C-1.2 How to Receive Repair Service ..................................48
Table of Contents

© 2017 Sensata Technologies 1
1.0 Introduction
Congratulations on your purchase of an MMS Series inverter/charger
from Sensata Technologies. This product is designed especially for
your small home or mobile application. Powerful, yet simple to use,
this product will provide you with years of trouble-free use.
1.1 MMS Series Models
MMS1012 – a 1000 watt inverter/charger with a 50-amp, 4-stage
Power Factor Correction (PFC) charger. The AC input and output
are provided with pigtail wires to allow hardwiring to a main AC
distribution panel and to an inverter sub-panel. Features isolated
input/output neutrals for mobile applications. Includes a 15-foot
battery temperature sensor.
Figure 1-1, MMS1012 Model Inverter/Charger
MMS1012-G – a 1000 watt inverter/charger with a 50-amp, 4-stage
PFC charger. The AC input is provided by a standard 3-foot plug-in
power cord, and the AC output is provided by a standard GFCI two plug
outlet. Features isolated input/output neutrals for mobile applications.
Includes a 15-foot battery temperature sensor.
Figure 1-2, MMS1012-G Model Inverter/Charger
Introduction

© 2017 Sensata Technologies
2
1.2 How an Inverter/Charger Works
An inverter takes direct current (DC) from your batteries and turns
it into alternating current (AC), like you use at home. With MMS
Series models, it also takes alternating current (when connected to
a generator or to shorepower) and transforms it into direct current
to recharge your batteries.
The two modes of operation associated with this inverter/charger are
referred to in this document as:
Inverter Mode: DC from the batteries is transformed into pure sine
wave AC for powering your applications.
Standby Mode: The unit operates as a battery charger to convert
incoming AC power into DC power to recharge the batteries while
continuing to pass the incoming AC power directly to the inverter’s
output, to power any AC loads.
1.3 Pure Sine Wave vs Modified Sine Wave
Today’s inverters come in two basic output waveforms: modified sine
wave and pure sine wave.
Modified sine wave inverters approximate a pure sine waveform and
will run most appliances and electronics without any problems. These
inverters are less expensive and, therefore, offer a viable alternative
to more expensive pure sine wave inverters.
The output of a pure sine wave inverter is equal to, or in many
cases, better than the utility power used in your home. Virtually
any electronic device will operate from a pure sine wave inverter.
Motors run cooler, microwaves usually cook faster, and clocks keep
better time just to name a few examples. Without compromising
quality or performance, the MagnaSine provides you with all of the
advantages of a pure sine wave inverter at a much lower cost than
many on the market.
1.4 Appliances and Run Time
The MMS Series inverter/charger can power a wide range of household
appliances. As with any appliance using batteries for power, there
is a certain length of time that it can run—this is called “run time”.
Actual run time depends on several variables including the size and the
type of appliance, the type of batteries installed in your application,
as well as the battery’s capacity and age. Other factors such as the
battery’s state of charge and temperature can also affect the length
of time your appliances can run.
Depending on your inverter capacity, larger electrical appliances
such as coffee pots and hair dryers can be used for short durations.
However, loads that are used for longer periods such as stoves
or water heaters can quickly drain your batteries and are not
recommended for inverter applications.
Introduction

© 2017 Sensata Technologies 3
Introduction
All electrical appliances are rated by the amount of power they
consume. The rating is printed on the product’s nameplate label,
usually located on its chassis near the AC power cord. Even though
it is difficult to calculate exactly how long an inverter will run a
particular appliance, the best advice is trial and error. Your MMS
Series inverter/charger has a built-in safeguard that automatically
protects your batteries from being over-discharged.
1.5 Standard Features and Benefits
The MMS Series inverter/charger converts 12 volts of direct current
(VDC) power from your battery to 120 volts alternating current (VAC)
power. The multi-stage battery charger optimizes incoming AC power
using Power Factor Correction (PFC) technology to keep the inverter’s
battery bank fully charged. This inverter is designed to allow easy
installation and use, and with its die-cast aluminum baseplate it
ensures maximum durability and cooler, more efficient operation.
The inverter/charger provides the following:
• 1000 watts continuous at 25°C (77°F).
• Numerous protection features to provide a safe and peace-of-
mind operation.
• AC transfer switch circuitry; allowing incoming AC power to
continue to pass-thru to power loads even if the inverter is off.
• Dead battery charging for batteries that are extremely low.
• Automatic 4-stage battery charger with power factor correction
and temperature compensation—for optimum battery charging
(using the temperature sensor).
• Modern and aesthetically pleasing design with a large AC wiring
compartment (provides easy access to AC wiring for simple and
quick connections) and 360° DC connection terminals with color
coded insulating covers.
• True RMS output voltage regulation to ensure the inverter will
deliver the correct amount of power—within the DC input voltage
range and the continuous output power level.
• Quick connection accessory and remote ports—easily accepts
several optional remote controls and the battery temperature
sensor.

© 2017 Sensata Technologies
4
Figure 1-3, Top and Left Side Features
1. Inverter Status Indicator – a green LED that illuminates to
provide information on the inverter’s operation.
2. Power Switch –amomentary pushbutton switch that turns the
inverter on or off.
3. Negative DC Terminal (black) – the inverter’s connection to
the negative terminal on the battery bank.
4. Positive DC Terminal (red) – the inverter’s connection to the
positive terminal on the battery bank.
5. Input Circuit Breaker – a circuit breaker that protects the unit’s
internal wiring and pass-thru relay.
6. Output Circuit Breaker –a circuit breaker that provides another
layer of overload protection. Not a branch circuit-rated breaker.
Separate AC output breakers may be required on the output.
7. Mounting Flanges (x4) – secure the inverter to shelf/wall.
8. AC Wiring Compartment - provides access for all AC input and
output connections on the inverter.
9. AC Output Connection –AC knockout for hardwiring AC output.
10. AC Input Connection –a strain relief clamp for hardwiring AC
input. On the MMS1012-G model, the strain relief comes with an
attached flexible AC input power cord.
11. DC Ground Terminal –a connection that is used to tie the
exposed chassis of the inverter to the DC grounding system.
Accepts CU/AL conductors from #14 AWG (2.1 mm²) to #6 AWG
(13.3 mm²).
12. GFCI Outlet – Ground Fault Circuit Interrupter outlet (with test
and reset capability). MMS1012-G models only.
1 2
3
4
5
6
7
8
10 911
12
Introduction

© 2017 Sensata Technologies 5
Introduction
Figure 1-4, Front and Back Side Features
13. Warning and Information Label –provides pertinent
information for safely using the inverter.
14. REMOTE Port Connection –a RJ11 connector that allows an
optional remote control to be connected.
15. ACCESSORY PORT Connection – a RJ11 connector to allow
the Battery Temperature Sensor (BTS) or MMS accessories (e.g.,
MM-DCLD, MM-ISA) to be connected.
16. Intake Vent –ventilation openings to pull in air to keep the
inverter cool for peak performance.
17. Exhaust Vent –ventilation openings that allow heated air to be
removed by the internal cooling fan.
18. Model/Serial Number Label –includes model/serial number
and provides specifications and information on the inverter and
charger. See the MMS Series Specifications (Table 5-1) for more
information and the different models available.
Front Side 13
15
16
Back Side
17
18
14
NOTE: MMS1012-G model shown, MMS1012 model has identical front
side and back side features.

© 2017 Sensata Technologies
6
Introduction
FRONT VIEW
SIDE VIEW
~2" (5.1 cm) ~1"
~½”
0.375" diameter
Cable
~¾”
(2.5 cm)
(.95 cm)
(1.9 cm)
(1.3 cm)
Figure 1-5, Battery Temperature Sensor (BTS)
1.5.1 Battery Temperature Sensor
A plug-in external Battery Temperature Sensor (BTS) is provided
for units with the battery charger feature. When installed, the BTS
automatically adjusts the battery charger’s BULK, ABSORB, and
FLOAT voltage set-points (based on temperature) for better charging
performance and longer battery life. If the temperature sensor is
NOT installed and the batteries are subjected to large temperature
changes, battery life may be shortened. See Section 3.2 for more
information on the BTS.

© 2017 Sensata Technologies 7
2.0 Installation
2.1 Pre-Installation
Before installing the inverter, read the entire Installation section.
Thorough planning will better meet your inverter needs.
WARNING: Installations should be performed by
qualified personnel (licensed or certified electrician).
The installer determines which safety codes apply and
ensures that all applicable installation requirements are
followed. Applicable installation codes vary depending on
the specific location and the type of installation.
Info: Review the Important Product Safety Information
and Important Battery Safety Instructions on pages ii-vi
before any installation.
The basic system diagrams shown in Figures 2-1 and 2-2 should be
reviewed to assist you in planning and designing your installation.
2.1.1 Unpacking and Inspection
Carefully remove the MMS inverter/charger from its shipping container
and inspect all contents. Verify the following items are included:
• MMS Series inverter/charger
• Red and black DC terminal covers
• AC access cover with two screws
• Two 5/16-18 hex-head kep nuts (installed on the DC terminals)
• Battery Temperature Sensor (BTS)
• MMS Series Owner’s Manual
• Warning Label
If items appear to be missing or damaged, contact your authorized
Magnum Energy dealer or Sensata Technologies. If at all possible,
keep your shipping box. It will help protect your inverter from damage
if it ever needs to be returned for service. Save your proof-of-purchase
as a record of your ownership (needed for any in-warranty service).
Record the unit’s model and serial number in the front of this manual
in case you need to provide this information in the future. It is much
easier to record this information before the unit has been installed.
Installation
2.1.2 Locating and Mounting the Inverter
WARNINGS:
• Do not mount the inverter near any flammable or
combustible fluid or components.
• Provide adequate clearance/ventilation to the inverter.
• Mount only on a non-combustible surface.
• Maximum ambient temperature around the inverter
must not exceed 77°F (25°C) to meet continuous power
output specifications.

© 2017 Sensata Technologies
8
Installation
Figure 2-1, MMS1012 Model Basic Installation Diagram
120VAC power to inverter
DC
Overcurrent
Protection
(breaker or
fuse/switch)
MMS1012
Inverter/Charger
120VAC inverter
power
to sub-panel
DC
Shunt
BTS
Main Panel
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
AC
Transfer
Switch
Generator Power
120VAC Output
Shorepower
120VAC Output
ME-AGS-N
Auto Gen Start
Controller
120
VAC
ON
OFF
Sub-Panel
ME-BMK
Battery Monitor
with shunt
(Magnum
Accessory)
ME-SBC
Smart Battery
Combiner
(Magnum
Accessory)
12V Battery Bank
ME-RC50
Remote Controls
BULK
ABSORB
FLOAT
INV ER T
AC IN
FAULT
ON/OFF
MM-RC
SELECT
TECH
AGS M ETER SETU PSH ORE
INVERTE
R
CH ARGER
INV
CHG
FAU LT
PWR
ON/OFF
ON/
OFF

© 2017 Sensata Technologies 9
Figure 2-2, MMS1012-G Model Basic Installation Diagram
DC Overcurrent
Protection
(breaker or fuse/switch)
MMS1012 -G
Inverter/Charger
DC
Shunt
BTS
ME-BMK
Battery Monitor
with shunt
(Magnum
Accessory)
ME-SBC
Smart Battery
Combiner
(Magnum
Accessory)
12V Battery Bank
ME-RC50
Remote Controls
BULK
ABSORB
FLOAT
INV ER T
AC IN
FAULT
ON/OFF
MM-RC
SELECT
TECH
AGS M ETER SETU PSH OR E
INVERTE
R
CH ARGER
INV
CHG
FAU LT
PWR
ON/OFF
ON/
OFF
AC
IN
120
VAC
AC OUT
DVR
TV Tools
Installation

© 2017 Sensata Technologies
10
Installation
The inverter should only be installed in a location that meets the
following requirements:
Clean and Dry – The inverter should not be installed in an area that
allows dust, fumes, insects, or rodents to enter or block the inverter’s
ventilation openings. The area also must be free from any risk of
condensation, water, or any other liquid that can enter or fall on the
inverter. The inverter uses stainless steel fasteners, plated copper
busbars, and a power-coated aluminum base. Also, the internal circuit
boards are conformal coated. The above measures are undertaken to
help fight the harmful effects of corrosive environments. However,
the life of the inverter is uncertain if used in any of these types of
environments, and inverter failure under these conditions is not
covered under warranty.
Cool – The inverter should be protected from direct exposure to the
sun or any equipment that produces extreme heat. The ambient air
temperature should be between 32°F (0°C) and 104°F (40°C); keep
in mind that the inverter’s output specifications are rated at 77°F
(25°C), so the cooler the better within this range.
Ventilated – In order for the inverter to provide full output power
and avoid over-temperature fault conditions, do not cover or block
the inverter’s ventilation openings or install this inverter in an area
with limited airflow. Allow as much clearance around the inverter’s
intake and exhaust ventilation openings as possible (see Figure 1-4,
Items 16 & 17). At the minimum, allow an airspace clearance of 3”
(7.5 cm) on all sides to provide adequate ventilation.
If installed in an enclosure, a fresh air intake opening must be provided
directly to the front side (intake vent) and an exhaust opening on
the back side (exhaust vent) of the inverter. This will allow cool air
from the outside to flow into the inverter, and heated air to exit away
from the inverter and the enclosure. When mounted in an enclosed
compartment, airflow must be at least 59 cfm in order to maintain no
more than a 68°F (20°C) rise in compartment temperature. Minimum
clearances can be reduced if airflow is increased, but in no case should
clearance around the inverter be less than 2” (5 cm) on all sides.
Safe – Keep any flammable/combustible material (e.g., paper, cloth,
plastic, etc.) that may be ignited by heat, sparks, or flames at a
minimum distance of 2 feet (60 cm) from the inverter.
WARNING: The MMS inverter/charger should not be
installed in any location that requires ignition-protected
equipment. To prevent fire or explosion, do not install in
any area with extremely flammable liquids like gasoline
or propane; or, in an area that contains connections
between components of a fuel system.

© 2017 Sensata Technologies 11
Close to the battery bank – As with any inverter, it should be
located as close to the batteries as possible. Long DC wires tend to
lose efficiency and reduce the overall performance of an inverter.
However, the unit should not be installed in the same compartment as
the batteries or mounted where it will be exposed to gases produced
by the batteries. These gases are corrosive and will damage the
inverter. Also, if these gases are not ventilated and allowed to collect,
they could ignite and cause an explosion.
Accessible – Do not block access to the inverter’s remote control
and accessory ports. Also, allow enough room to access the AC and
DC wiring connections, as they will need to be checked and tightened
periodically. Refer to Figures 2-4 and 2-5 for the specific dimensions
of the two MMS Series models.
Mounting Orientation – To meet regulatory requirements, the MMS
Series inverter/charger can only be mounted on a horizontal surface
(shelf or table) or a vertical surface (wall or bulkhead) either right-
side up or upside-down, as shown in Figure 2-3. The inverter must
be mounted on a non-combustible surface, and this surface and the
mounting hardware must be capable of supporting at least twice the
weight of the inverter. After determining your mounting position,
use the base of the inverter’s chassis as a template to mark your
mounting screw locations. Remove the inverter and drill pilot holes
into the mounting surface.
If this unit is used in a mobile application, you may want to place
flexible washers or bushings between the mounting surface and the
inverter’s mounting flanges to reduce vibration.
Shelf Mounted
(right-side up)
Shelf Mounted
(up-side down)
Wall Mounted (up-side down)
Wall Mounted (right-side up)
Figure 2-3, Approved MMS1012 (-G) Mounting Orientations
Installation