Magnum Energy ME Series User manual

ME Series
Inverter / Chargers
Operators Manual

2003 - Magnum Energy, Inc.
IMPORTANT SAFETY INSTRUCTIONS
This manual contains important safety instructions that must me followed
during the installation and operation of this product.
To reduce the risk of electrical shock, fire, or other safety hazard, the follow-
ing safety symbols have been placed throughout this manual to indicate
dangerous and important safety instructions.
WARNING - Indicates a dangerous voltage or condition exists.
CAUTION - Indicates a critical step necessary for the safe installation
and operation of this device.
NOTE - Indicates an important statement. Follow these instructions
closely.
ATTENTION - Electrostatic Sensitive Devices. Observe precautions for
handling.
All electrical work must be performed in accordance with local, state and
federal electrical codes.
Read all instructions and safety information contained in this manual before
installing or using this product.
This product is designed for indoor / compartment installation. It must not
be exposed 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 per-
forming maintenance on the inverter.
Live power may be present at more than one point since an inverter utilizes
both batteries and AC.
Always verify proper wiring prior to starting the inverter.
There are no user serviceable parts contained in this product.
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2003 - Magnum Energy, Inc.
IMPORTANT
BATTERY SAFETY INSTRUCTIONS
Wear eye protection such as safety glasses when working with batteries.
Remove all jewelry such as rings, watches, bracelets, etc., when installing or
performing maintenance on the inverter.
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 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 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 even of accidental exposure to battery acid, wash thoroughly with
soap and water. In the even of exposure to the eyes, flood them for at least
15 minutes with running water and seek immediate medical attention.
Recycle old batteries.
SAVE THESE INSTRUCTIONS
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2003 - Magnum Energy, Inc.
Magnum Energy
ME Series Inverter / Chargers
Table of Contents
iii
Section Description Page
1. Introduction 1
1. Features and Benefits 1
2. Standard Features 1
3. How an Inverter/Charger Works 3
4. Appliances and Run Time 3
5. The ME Series Inverter/Charger 5
2. Installation 7
1. Unpacking and Inspection 7
2. Pre-Installation 7
Locating the Inverter 7
Locating Dedicated Batteries (optional) 7
Hardware / Materials Required 8
Tools Required 8
Wiring 8
AC Connections 8
DC Connections 8
AC Grounding 8
DC Grounding 8
Torque Requirements 9
AC Main Panel 9
Circuit Protection 9
Wire Routing 9
3. Installation 11
Inverter Mounting 11
Battery Installation 11
Battery Cables and Sizing 12
DC Wiring 12
DC Grounding 12
Negative Cable 12
Positive Cable 12
Battery Wiring 13
Parallel Connection 13
Series Connection 15
Series/Parallel Connection 15
DC Fuse Block 17
AC Wiring 19
AC Input (Shore Power) Routing 19
AC Input (Generator) Routing 19
Main AC Electrical Panel Routing 19
Wiring the Inverter AC Input 21
Wiring the Inverter AC Output 21
Final Inspection 21

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iv
Section Description Page
2. Installation, continued
4. Options 25
Battery Temperature Sensor Installation and Wiring 25
Remote Control Installation and Wiring 25
AGS Module 25
Smart Shunt 25
Stacking Cable Kit 25
5. Start-up and Test 26
Connecting the Batteries to the Inverter 26
Final Inspection and Power-up 26
Configuring the Inverter 27
3. Operation 28
1. Operating the Inverter 29
Search 29
Inverter Mode 29
AC Shore Power Mode 29
Bulk Charge Mode 29
Absorption Charge Mode 29
Float Charge Mode 29
Battery SaverTM Mode 29
Fault or Alarm Conditions 31
Low Battery 31
High Battery 31
Overload 31
Overtemperature 31
4. Troubleshooting 33
1. Basic Troubleshooting 33
5. Preventive Maintenance 34
1. Recommended Inverter and Battery Care 34
2. Off-Season Storage 34
6. Specifications 35
7. Warranty 36
Table of Contents, continued

2003 - Magnum Energy, Inc. 1
1. INTRODUCTION
1. Features and Benefits
Congratulations on your purchase of the ME Series inverter/charger from Magnum
Energy. The ME Series is a new generation inverter designed especially for rugged
recreational vehicle usage. Powerful, yet simple to use, the Magnum Energy inverter
will provide you with years of trouble-free performance so you can enjoy the all of
the comforts you have come to expect from your RV, all backed by our limited 3 year
(36-month warranty).
The ME Series inverter is ETL Listed meeting the stringent requirements of UL458,
ensuring you the highest level of electrical safety and reliability.
Installation is easy. Simply connect the inverters output to your distribution
circuits or electrical panel; connect your shore power cable (AC) to the inverters
easy-to-reach terminal block; connect the batteries, and then switch on the power.
Using the optional remote control, you can easily operate your inverter from any-
where within your motor coach.
2. Standard Features
•Four Power Models (ME1512RV, ME2012RV, ME2512RV and ME3012RV)
•Shelf, Bulkhead or Upside Down Mounting
•Modified Sine Wave Output
•Power Factor Corrected Charger (Sine Wave)
•RS485 Communication Port
•Remote Port
•Flash Programming
•ON/OFF Inverter-mounted Switch with LED Indicator
•50 Amp Transfer (on Dual IN / Dual OUT Models)
•Extra Large AC Access Cover with Terminal Screw Block
•360 degree DC Connection Terminals with Covers
•Battery Temperature Sensor - for optimum battery charging
•Aluminum Cover
•Smooth, Aesthetically Pleasing Design
•ETL listed to UL/cUL 458
The following accessories are also available for ME Series products:
Remote Control - for convenient finger tip operation
AGS Module - automatically starts and stops your generator
Smart Shunt - provides precise voltage to DC current
Stacking Cable Kit - designed to accommodate dual inverter configurations

2003 - Magnum Energy, Inc.
2
1. INTRODUCTION
Figure 1
ME Series Inverter / Charger

2003 - Magnum Energy, Inc. 3
1. INTRODUCTION
3. How an Inverter/Charger Works
An inverter takes direct current (DC) from your batteries and turns it into alter-
nating current (AC), exactly like you use at home. It also takes alternating current
when your motor coach is connected to shore power and transforms it into direct
current to recharge your batteries.
There are two modes of operation associated with an inverter/charger:
Inverter Mode:
Direct current (DC) from the vehicles batteries is transformed into alternating
current (AC) for use with you household electrical appliances.
Charger Mode:
Alternating current (AC) is taken directly from shore power (or other AC sources)
and passed directly to your household appliances. At the same time, the incoming
AC is also converted to DC to recharge the vehicles batteries.
4. Appliances and Run Time
The ME Series inverter/charger can power a wide range of household appliances
including small motors, hair dryers, clocks and other electrical devices. 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 recreational
vehicle, 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.
Appliances such as TVs, VCRs, stereos, computers, coffee pots, incandescent
lights and toasters can all be successfully powered by your inverter. Larger electrical
appliances, however, such as stoves, water heaters, etc., can quickly drain your
batteries and are not recommended for this application.
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 ME
Series inverter has a built-in safeguard that automatically protects your batteries
from over discharge.
NOTE: For optimum performance, a minimum battery bank of 200 AHr is
recommended.
Table 1 - Typical Appliance Power Consumption
Device Load Device Load
Blender 400 W Coffee Maker 1200 W
Computer 300 W Color TV 150 W
Drill 500 W Hair Dryer 1000 W
Hot Plate 1800 W Iron 1000 W
Light (Flo) 10 W Light (Inc) 100 W
Microwave 1000 W Refridgerator 500 W

2003 - Magnum Energy, Inc.
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Figure 2
ME Series Inverter / Charger
Switch, LED and Connection Ports
Charging / Inverting
LED
Stack Port
Magnum Net Port
Remote Port
Battery Temp Sensor
Port
1. INTRODUCTION
Power ON/OFF
Switch
Figure 3
ME Series Inverter / Charger
Electrical Connection Points
AC Connections DC Connections

2003 - Magnum Energy, Inc. 5
5. The ME Series Inverter/Charger
The ME Series inverter/charger is designed to allow easy access to wiring, circuit
breakers, controls and LED status indicator. Its die cast baseplate with one piece
aluminum cover ensures maximum durability with minimum weight, as well as cooler
more efficient operation. The inverter is equipped with the following features:
ON / OFF Switch - used to manually switch the inverter ON and OFF.
Green LED Indicator
•Medium flash (1 every 2 seconds)
Indicates connected loads are being powered from the batteries (inverting).
•Fast flash (1 per second)
Indicates search mode, conserving power when appliances are switched OFF.
•Solid
Indicates bulk charge when the batteries are low and the inverter is connected
to shore power.
•Fast flash (1 per second)
Indicates absorption charge when the batteries are almost fully recharged and
the inverter is connected to shore power.
•Slow flash (1 every 8 seconds)
Indicates float charge when batteries are fully charged and the inverter is
connected to shore power.
•LED off
Indicates a fault condition such as low battery, overload or over temperature.
Remote Control Port - accepts connector for Magnum remote control cable.
BTS Port - accepts connector for remote battery temperature sensor cable.
MagnumNet Communication Port - accepts connector for Auto Gen Start or Smart
Shunt (DC current display) cable.
Positive Battery Terminal - provides 360 degree connection point for the positive
(+) cable from the vehicles batteries.
Negative Battery Terminal - provides 180 degree connection point for the
negative (-) cable from the vehicles batteries.
Chassis Ground Connector - accepts chassis ground cable.
AC Access Cover - provides access to internal AC screw terminal connections.
AC Input Circuit Breaker - protects main AC (shore power) input circuit.
AC Output 1 Circuit Breaker (optional) - protects the primary AC output circuit
(on dual out units only).
AC Output 2 Circuit Breaker (optional) - protects secondary AC output circuit
(on dual out units only).
ME Series Nameplate Label - provides product and safety information.
1. INTRODUCTION

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6
2. INSTALLATION
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2003 - Magnum Energy, Inc. 7
2. INSTALLATION
1. Unpacking and Inspection
Carefully remove the ME Series inverter from its shipping container and inspect all
contents. If items appear to be missing or damaged, contact Magnum Energy
at [phone] or your authorized Magnum Energy dealer. If at all possible,
retain the shipping container in the event the unit ever needs to be returned for
factory service.
ATTENTION: Electrostatic Sensitive Devices. Observe precautions for
handling.
2. Pre-Installation
Before installing the inverter, read all of the instructions and cautionary markings
contained in this manual.
NOTE: The inverter is heavy. Use proper lifting techniques during installation to
prevent personal injury.
Locating the Inverter
The inverter must be mounted in a clean, dry, ventilated environment where the
ambient temperatures will not exceed 122 ºF (50 ºC). The location must be fully
accessible and protected from exposure to heat producing devices. You can mount
the inverter horizontally, vertically or upside-down. It must be securely fastened to a
shelf, bulkhead, or other structural part.
Allow enough clearance to access the AC and DC connection points as well as the
inverters controls and status indicator. As with any inverter, it should be located as
close to the batteries as possible. Longer battery cable runs tend to loose efficiency
and reduce the overall performance of an inverter.
If you are planning to install dedicated batteries, other than the vehicles, make
sure they are in a dedicated compartment that has ventilation to the outside. Also it
is important that you never mount the inverter directly above the batteries as they
emit corrosive fumes which could damage the inverters electronics.
Locating Dedicated Batteries (optional)
Dedicated batteries must be mounted in a clean, dry, ventilated environment
where they are protected from high and low temperatures. The batteries must be
mounted upright (if using liquid batteries) and securely fastened to the vehicle. The
location must be fully accessible and protected from exposure to heat producing
devices.
To ensure optimum performance, a ventilated battery enclosure is recommended.
The batteries should be located as close as possible to the inverter. Longer battery
cable runs tend to loose efficiency and reduce the overall performance of an inverter.
Also, do not mount the batteries beneath the inverter (or in the same compartment).
Batteries emit corrosive fumes which could damage the inverters electronics.
NOTE: For optimum performance, Magnum Energy recommends using AGM
(absorbed glass mat) batteries such as LifelineTM brand batteries.
CAUTION: Never locate dedicated batteries near the vehicles fuel tanks
containing gasoline or propane.

2003 - Magnum Energy, Inc.
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2. INSTALLATION
2. Pre-Installation, continued
Hardware / Materials Required
Conduit, strain-reliefs and appropriate fittings
1/4" mounting bolts and lock washers
Electrical tape
Wire ties
Tools Required
Misc screw drivers Level 1/2" wrench
Drill and drill bits Pliers Wire strippers
Level Pencil or Marker Multimeter
Wiring
Pre-plan the wire and conduit runs. For maximum safety, run both AC and DC
wires/cabling in (separate) conduit. Direct current wiring, due to its potential to
generate RFI, should be tied together with electrical tape. Wiring and installation
methods must conform to all applicable electrical codes.
NOTE: Run DC cabling in twisted pairs, keeping the runs as short as practical.
AC Connections
Use #10 AWG (or larger) THHN wire for all AC wiring. The inverters AC terminal
blocks accept up to #6 AWG wire.
DC Connections
Battery to inverter cabling should be only as long as required. If using #2/0 AWG
cables, do not exceed 5 feet (one way) for 12 VDC systems.
Crimped and sealed copper ring terminal lugs with a 5/16 hole should be used to
connect the battery cables to the inverters DC terminals.
AC Grounding
The ME Series inverter/charger contains an internal neutral-to-ground switching
circuit for the AC electrical system.
WARNING: The AC shore power neutral must be grounded ONLY through the
shore power cable. Do not ground AC to the vehicles chassis.
DC Grounding
The inverter/charger should always be connected to a permanent, grounded
wiring system. For the majority of installations, the negative battery conductor is
bonded to the vehicles safety-grounding conductor (green wire) at only one point in
the system. The size for the conductor is usually based on the size of the largest
conductor in the DC system. DO NOT connect the battery negative (-) cable to the
vehicles safety ground. Connect it only to the inverters negative battery terminal.
If there are any non-factory installed DC appliances on board the vehicle, DO NOT
ground them at the safety ground. Ground them only at the negative bus of the DC
load center (as applicable).

2003 - Magnum Energy, Inc. 9
2. INSTALLATION
2. Pre-Installation, continued
Torque Requirements
Torque all AC wiring connections to 16 inch pounds. Torque DC cable connections
to 10-12 foot pounds.
AC Main Panel
If the installation will be powering a wide-range of appliances throughout the
vehicle, an AC main panel is often recommended. This is similar in appearance and
function as your homes circuit breaker panel, providing an additional level of control
and protection for the various circuits. Always refer to electrical codes for safe wiring
practices.
Circuit Protection
If using a AC main panel for distribution, always use breakers that provide the
correct ampere branch circuit protection in accordance with the National Electric
Code. The breakers must also be properly rated for the appliances that will be
powered.
NOTE: Both AC and DC disconnects / overcurrent protection must be provided as part
of the installation.
Wire Routing
Determine all wire routes throughout the vehicle both to and from the inverter.
Conductors that are at risk to physical damage must be protected by conduit, tape,
or placed in a raceway. Conductors passing through walls, bulkheads or other struc-
tural members must be protected to minimize insulation damage such as chafing.
During the installation, always avoid placing conductors near sources of chafing
caused by vibration or constant rubbing.
CAUTION: Always check for existing electrical, plumbing or other areas of
potential damage prior to making cuts in structural surfaces,
bulkheads or walls.
Typical routing scenarios are:
AC Input wiring from the shore power source to the inverter
AC Input wiring from a generator (optional) to the inverter
DC Input wiring from the batteries to the inverter
AC Output wiring from the inverter to the coachs AC main panel or to dedicated
circuits
Battery Temperature Sensor cable (optional) from the inverter to the batteries
Remote Control cable (optional) to the inverter
Ground wiring from the inverter to an external vehicle ground

2003 - Magnum Energy, Inc.
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2. INSTALLATION
Figure 4
ME Series Inverter / Charger Base Plate
Mounting Screw
Placements
Table 2 - Recommended Battery Cable Sizing
Inverter ME1512 ME2012 ME2512 ME3012
DC Rating 150 amps 200 amps 250 amps 300 amps
@ 1 to 3 ft #2/0 AWG #2/0 AWG #4/0 AWG #4/0 AWG
@ 3 to 5 ft #4/0 AWG #4/0 AWG #4/0 AWG #4/0 AWG
@ 5 to 10 ft #4/0 AWG #4/0 AWG #4/0 AWG consult code

2003 - Magnum Energy, Inc. 11
2. INSTALLATION
3. Installation
NOTE: Read all instructions and cautionary markings located at the beginning of this
manual and in the pre-installation section, before installing the inverter and
batteries.
CAUTION: Do not mount the inverter or the batteries near the vehicles
gasoline or propane fuel tanks.
Mount the inverter only on a non-combustable surfaces.
Maximum abient temperature MUST NOT exceed 113 °F (45 °C).
For Canadian installations, the inverters vents must face
downward.
Inverter Mounting
Position the inverter in the designated mounting location horizontally, vertically or
upside-down. Allow enough clearance to access the AC and DC connection points as
well as the inverters controls and status indicator. Also allow for air flow in to and
around the inverter, especially near the cooling fans (approximately 3).
Mark the mounting holes in the base of the inverters chassis. Remove the in-
verter and drill pilot holes into the mounting surface.
Secure the inverter to the mounting surface using appropriate screws and
lockwashers.
Remove the inverters AC access panel in accommodate the AC Input and Output
wiring and conduit.
Battery Installation
NOTE: To ensure the best performance from your inverter system, do not use old or
untested batteries. Batteries must be of the same size, type, rating and age.
NOTE: For optimum performance, Magnum Energy recommends using AGM
(absorbed glass mat) batteries such as LifelineTM brand batteries.
NOTE: If using Flooded Lead Acid batteries, they must be mounted upright.
CAUTION: Install batteries in a well ventilated area. Batteries can produce explosive
gasses. For compartment or enclosure installations, always vent batteries
to the outside.
Place the batteries as close as practical to the inverter, preferably in an insulated
and ventilated enclosure. Allow adequate space above the batteries (+/- 6 above
the batteries) to access the terminals and vent caps (as applicable). Also allow at
least 1 of space between the batteries to provide good air flow. DO NOT mount the
batteries directly under the inverter.
Secure the batteries to the mounting surface with battery hold down clamps.

2003 - Magnum Energy, Inc.
12
2. INSTALLATION
3. Installation, continued
Battery Cables and Sizing
Select the correct battery cables for the installation from the table. It is impor-
tant to use the correct cable to achieve maximum efficiency from the system and
reduce fire hazards associated with overheated cables. Undersized cables can also
lower the inverters peak output voltage as well as reduce its surge power capability.
Long cable runs also reduce efficiency due to resistance in the cable. Always keep
your cable runs a short as practical.
Battery cables must be color coded with colored tape or heat shrink tubing: RED
for positive (+); BLACK for negative (-); and GREEN for DC ground.
The cables must have soldered and crimped lugs, crimped copper compression
lugs, or aluminum mechanical lugs. Soldered connections alone are not acceptable
for this application.
DC Wiring
Refer to the safety information at the beginning of the manual before proceeding. DC
wires and cables should be tied together with wire ties or electrical tape approxi-
mately every 6 inches.
WARNING: De-energize all sources of power including batteries (DC), shore
power (AC), and AC generator (if applicable).
CAUTION: Inverter is NOT polarity protected. Verify proper polarity BEFORE
connecting the battery cables.
NOTE: DO NOT connect the battery cables to the inverter until all wiring is complete
and the correct DC voltage and polarity has been verified.
NOTE: Make sure cables have a smooth bend radius and do not become kinked.
Place long cable runs in conduit and follow existing wire runs where possible.
DC Grounding
Route a grounding cable (GREEN) from the inverters ground lug to a dedicated
vehicle ground.
Negative Cable
Route a negative cable (BLACK) from the house battery bank (or dedicated bat-
tery compartment) to the inverters negative terminal
Positive Cable
Route a positive cable (RED) from the house battery bank (or dedicated battery
compartment) to the Fuse Block assembly (DC Disconnect). The DC disconnect is
usually located next to or near the batteries. DO NOT connect the positive cable to
the batteries at this time.
Route a positive cable (RED) from the Fuse Block assembly (DC Disconnect) to
the
inverters positive terminal DO NOT connect the positive cable to the inverter at this
time.

2003 - Magnum Energy, Inc. 13
2. INSTALLATION
3. Installation, continued
Battery Wiring
WARNING: During the installation and wiring process, cover exposed battery
cable ends with electrical tape to prevent shorting the cables.
NOTE: DO NOT connect the positive cable to the inverter at this time.
Depending upon the type of battery you use in the installation (6 or 12 VDC), the
batteries must be wired in series, parallel or series/parallel to provide 12 VDC. The
interconnecting battery cables must be sized and rated exactly the same as those
that used to connect the inverter.
When connecting the cable to the battery terminal, hardware should be installed
in the following order: bolt, ring washer, cable lug, (battery terminal), ring washer,
lock washer, nut. Tighten terminal connections to at least 10 to 12 foot pounds.
When two cables are connected to a terminal (i.e., negative terminal), the hard-
ware should be installed in the following order: bolt, ring washer, DC negative cable
lug, inverter negative cable lug, (battery terminal), ring washer, lock washer, nut.
Parallel Connection
(multiple 12 VDC batteries to create a 12 VDC string)
A parallel connection combines overall battery capacity by the number of batter-
ies in the string. Even though there are multiple batteries, the voltage remains the
same. In the example on the next page (Figure 7), four, 12 VDC, 100 AHr batteries
are combined into a single string, resulting in a 12 VDC, 400 AHr bank.
Connect the negative battery terminals together using short cables.
Connect the positive battery terminals together using short cables.
Connect the negative battery cable (BLACK) from the inverter to the negative
terminal of the end battery. At the same time, connect a DC ground cable between
the negative terminal and the vehicles DC grounding bus.
Connect the positive (RED) battery cable from the inverter to the positive termi-
nal of the battery at the opposite end of the string. This is essential to ensure even
charging and discharging across the entire battery string.
NOTE: A fuse must be placed between the positive terminal and the positive (RED)
battery cable to the inverter.
Once the batteries are completely wired and tested, coat the terminals with an
approved anti-oxidizing spray.
Figure 5
Battery Hardware Installation
Nut - Washer - Lug - Terminal - Washer - Bolt Nut - Washer - Lug - Inverter Terminal
Figure 6
Inverter Hardware Installation

2003 - Magnum Energy, Inc.
14
2. INSTALLATION
TO 24 VDC
INVERTER
Figure 9
Series/Parallel Battery Wiring
individual battery capacity = 200 AHr @ 6 VDC
combined battery capacity = 400 AHr @ 12 VDC
6 VDC
+
-
6 VDC
+
-
6 VDC
+
-
6 VDC
+
-
>
>
TO 12 VDC
INVERTER
+
-
Figure 8
Series Battery Wiring
individual battery capacity = 200 AHr @ 6 VDC
combined battery capacity = 200 AHr @ 24 VDC
6 VDC
+
-
6 VDC
+
-
6 VDC
+
-
6 VDC
+
-
>
>
+
-
Figure 7
Parallel Battery Wiring
individual battery capacity = 100 AHr @ 12 VDC
combined battery capacity = 400 AHr @ 12 VDC
12 VDC
+
-
12 VDC
+
-
12 VDC
+
-
12 VDC
+
-
>
>
TO 12 VDC
INVERTER
+
-