Regal Electro Solar MPPT 12-2 200W User manual

Solar Regulators
SRA MPPT12-2 200W Solar Battery Charger
OPERATIONS MANUAL
Solar MPPT 12-2 200W Battery
Charger Maximum Power Point
Tracker

Solar Regulators
SRA MPPT12-2 200W Solar Battery Charger
SPECIFICATIONS
Efficiency Typical
96%
Input Voltage
16V to 55V
Output Voltage
Float: 14.5V / 29V
Sealed LA Batteries: 14.2V / 28.4V
Output Power
Peak 250W / Constant 200W 29V / 150W 14.4V
Quiescent Current
0.04A
Thermal Protection
Multilevel Type
Dimensions (mm)
35 x 75 x 100mm
Indications
Dual LED Display –Battery OK / LOW
General Information:
Green LED On = Battery charging and all normal
Red LED Flashing = battery voltage low, below 0.9 of nominal voltage.
This MPPT is designed to auto detect 12V and 24V battery systems and select a suitable charge
regime.
The absorption phase is entered following a low battery condition and is maintained for approx. 1.5
hours.
Custom float and absorption voltages and times are possible but minimum orders apply.
This MPPT has a built in multilevel over temperature protection to improve product reliability while
maximising output power availability.
The MPPT 12 will efficiently charge 12V batteries from 24V panels.
The panel voltage limits for the MPPT12 are: max. open circuit voltage below 55V.
Minimum Maximum Power Point (at the max. operating temperature) must be above 17V for 12V
batteries and 24V for 24V batteries to ensure full power.
If used, this fuse is optional, locate the output fuse (OF) as close to the MPPT as possible (15A24VDC
rating).
Important:
Use only PV systems with open circuit voltage below 55V and a minimum V of 17V for 12V and 34V
for 24V charging.
Use wires suitable for at least 15A, but if the wire runs are over 3m then larger wires are
recommended to limit voltage drop and losses.
Install the unit in a dry place out of direct sunlight and away from flammable liquids or gases.
Battery fuse (BF) is always required and must be located as close to the battery as possible, its sizing
depends on the wire size and load ratings. Typically, a 15A 24V fuse would do.
Before connecting battery, always check the battery and PV panel polarity.
When used with panels over 150W at 12V or 200W at 24V the MPPT12 MUST be fitted with the PVF
fuse. Locate this fuse as close as possible to the MPPT. A 10A 60V fuse is recommended.
FOR OPTIMAL POWER OUTPUT THE FOLLOWING PANEL COMBINCATIONS ARE RECOMMENDED:
12V Charging
2x 12V Battery Panels connected in series (Total V = 42V & V = 32V)
1x 52 Cell Grid Panel (Total V = 31V & V = 25V)
1x 24V Battery Panel (Total V = 42V & V = 32V)
1x 60 Cell Grid Panel (Total V = 36V & V = 29V)
1x 48V Cell Grid Panel (Total V = 28V & V = 23V)
1x 72 Cell Grid Panel (Total V = 44V & V = 36V)
1x 54 Cell Grid Panel (Total V = 32V & V = 26V)
24V Charging
1x 72 Cell Grid Panel (Total V = 44V & V = 36V)
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OC
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Solar Regulators
SRA MPPT12-2 200W Solar Battery Charger
Settings and Configurations:
The MPPT12 factory default setting is for sealed lead acid batteries (Max. charge voltage 14.2V and float
voltage 13.4V) and auxiliary switch (grey wire) configured in Low Voltage Disconnect mode. The various
operating modes can be configured with a combination of the green and yellow wires and the internal links
CHE and REN.
ALWAYS ENSURE THAT THE CHE LINK IS SET FOR THE CORRECT BATTERY TYPE:
The yellow and green wires are either left unconnected (Ensure they are insulated from any other point), or
grounded (shorted to the black wire). To access the CHE (2 pin) and REN (3 pin) links carefully remove the rear
plastic cover.
CHE: Linked - Vented batteries, Unlinked - Sealed Batteries
REN: Right Link - 6hour DDS, Left Link - All night DDS, No Link - LVD
GREEN WIRE: Grounded - Enable remote load control and disable DDS and LVD
Floating - Disable RLC and enable DDS and LVD
YELLOW WIRE: Grounded - (Green Wire Grounded) Load disconnected, Floating - Load Connected
Note: if the Green wire is floating, the yellow wire has no effect.
Basic Wiring with Permanent Load Connection:
NOTE: First start up may take up to one minute.

Solar Regulators
SRA MPPT12-2 200W Solar Battery Charger
Wiring with Dawn to Dusk Switch:
The DDS option is intended to power up loads during night-time only.
This feature will not trigger during short periods of low light, it is an approximation only to actual ambient light
levels and if precise ambient light levels are required, then light sensors must be used.
The maximum DDS load current is 10A continuous or 20A transients.
The DDS can be set to approx. 6hours or ‘All Night’(Actual night duration and up to 15hours max.).
6Hour DDS Set-Up
All Night DDS Set-Up

Solar Regulators
SRA MPPT12-2 200W Solar Battery Charger
Wiring with Low Voltage Disconnect:
The LVD options disconnects the load when the battery voltage drops below 10.5V on 12V mode and 21V
when operating in 24V mode. This helps to protect the load from over-discharging your batteries.
This feature will not trigger during short transients.
The LVD maximum load is 10A continuous and 20A for short transients below a few seconds.
PLEASE ENSURE THAT YOUR MPPT HAS BEEN CORRECTLY CONFIGURED (REN AND CHE SETTINGS) FOR YOUR
APPLICATION. REFER TO THE SETTINGS AND CONIFGURATION SECTION FOR MORE INFORMATION.

Solar Regulators
SRA MPPT12-2 200W Solar Battery Charger
Wiring with Critical and Non-Critical Loads:
Critical loads are generally light loads which are powered under any condition. Non-critical loads are loads
which can be disconnected to ensure maximum on time for critical loads as well as to extend the life
expectancy and reliability of the system. The non-critical load can be set up as LVD, DD 6hours or DD all night
with the same REN configuration detailed earlier.
PLEASE ENSURE THAT YOUR MPPT HAS BEEN CORRECTLY CONFIGURED (REN AND CHE SETTINGS) FOR YOUR
APPLICATION. REFER TO THE SETTINGS AND CONFIGURATIONS SECTION FOR MORE INFORMATION.

Solar Regulators
SRA MPPT12-2 200W Solar Battery Charger
Wiring the Remote Alarm:
The remote alarm is a normally low 5V digital signal that goes high when the LVD disconnects. It has a 5mA
source/sink capability and can be used to remotely monitor the LVD status.
Wiring with Load Remote Control:
This option enables the remote load connection and disconnection via the load remote control, yellow wire.
When the yellow wire is grounded, the load is disconnected otherwise the load is connected. To configure this
mode the green wire must be grounded. This option overrides the LVD or DDS function but has the same load
limitations of 10A continuous or 20A transient.
PLEASE ENSURE THAT YOUR MPPT HAS BEEN CORRECTLY CONFIGURED (REN AND CHE SETTINGS) FOR YOUR
APPLICATION. REFER TO THE SETTINGS AND CONFIGURATIONS SECTION FOR MORE INFORMATION.

Solar Regulators
SRA MPPT12-2 200W Solar Battery Charger
MPPT FAQs
Q. What is an MPPT?
MPPT stands for Maximum Power Point Tracker and is a specialised converter designed to maintain the PV
voltage at the level in which it delivers maximum power to the load or battery. The panel’s nominal output
power can only be obtained with the use of an MPPT.
Q. What are the MPPTs advantages compared to standard solar regulators?
Suitable for lower cost non-battery type PV since the MPPT can efficiently charge the batteries from
relatively high voltage, say 12V batteries from 40V MPP panels.
Less interface and more accurate voltages during saturation and maintenance.
Q. What happens at low PV currents?
The MPPT will outperform the conventional regulator above 4% of nominal panel power. Below 4%, about 6W
in a 150W panel, the MPPT will have a slightly lower output current than a non MPPT.
Q. What sort of batteries should I use?
A deep cycle battery is a must due to the cyclical nature of the solar system with a recommended
battery capacity of at least 60Ah.
A larger battery will not give longer run time during low light but also will be able to avoid available
PV power being unstored such as when the battery reaches the maintenance stage.
Q. How do PV temperatures affect charge current?
Temperature increase brings down the PVs max. power point voltage reducing the MPPTs current gain
available. In principle, at 25°C, it is possible to achieve 30% gain but at 40°C, a more realistic average
temperature, about 20% is still available.
Q. What sort of loads can I power with the MPPT12-2
The maximum bulk charge current with the MPPT12 on a 12V battery and 150W panel is approx. 12A,
so you can expect about 40Ah/day which means a 40W load for about 10 hours daily.
Following the same reasoning with a 24V 200W panel, the MPPT 12 will supply a daily load of 40W for
about 15 hours.
Q. Is interface possible? And, if so, what do I do?
These MPPTs produce far less interference than a conventional solar regulator during the absorption and float
stages, that is during most of its operating time, and it is designed to comply with local and international EMI
standards however some interference is still possible. If interference occurs first, try and reorient the aerial or
move the sensitive equipment away from the MPPT wires. Ensure the MPPT chassis is grounded. Grounding a
battery terminal may also help and finally, you can try adding ferrite clamps.