
HUIZHOU EPEVER TECHNOLOGY CO., LTD. Tel:+86-10-82894896 / 82894112/+86-752-3889706 Website:www.epever.com
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※MT50 does not support the relevant parameters of lithium battery.
※Specific instructions refer to the list of accessories and software.
8. Protection
PV Over Current
The controller will limit battery charging current to the Maximum Battery Current
rating. Therefore an over-sized solar array will not operate at peak power.
PV Short Circuit
When PV short circuit is powered on or PV input is short circuit on low-power, the
controller will stop charging. Clear it to resume normal operation.
WARNING: The controller may be damaged, when PV input is short
circuit on high-power.
PV Reverse Polarity
Fully protection against PV reverse polarity, correct the wire connection to resume
normal operation.
WARNING: Controller will be damaged when the PV array straight
polarity and the actual operation power of the PV array is 1.5 times
greater than the rated charge power!
Battery Reverse Polarity
Fully protection against battery reverse polarity, correct the wire connection to
resume normal operation.
Battery Over Voltage
When the battery voltage reaches to the set point of Over Voltage Disconnect Voltage,
the controller will stop charging the battery to protect the battery from being over
charged to break down.
Battery Over Discharge
When the battery voltage reaches to the set point of Low Voltage Disconnect Voltage,
the controller will stop discharging the battery to protect the battery from being over
discharged to break down.
Battery Overheating
The controller detects the environment temperature through the external temperature
sensor. If the environment temperature exceeds 65 ºC, the controller will automatically
start the overheating protection to stop working, and recover below 55 ºC .
Lithium battery Low Temperature
The temperature sensor is less than the low temperature value, Lithium battery stop
charging/discharging. It is higher than the low temperature value, Lithium battery start
charging/discharging.
Load Overload
If the load current exceeds the maximum load current rating 1.05 times, the controller
will disconnect the load. Overloading must be cleared up through reducing the load
and restarting controller.
Load Short Circuit
Load will be switched off when load short circuit (≥4 times rated current) happens.
Controller will automatically attempt to reconnect load for 5 times. If short circuit
protection still exist after controller’s 5 times attempts, user have to clear short
circuit ,then restart the controller or wait for one night-day cycle (night time>3 hours).
Temperature sensor break down
If the temperature sensor short-circuited or damaged, the controller will be charging
or discharging at the default temperature 25 ºC to prevent the battery damaged from
overcharging or over discharged.
High Voltage Transients
The controller is protected against small high voltage transients. In lightning prone
areas, additional external suppression is recommended.
10. Troubleshooting
LED Charging
indicator turn off
during daytime
when sunshine falls
on PV modules
properly
Confirm that PV and battery wire
connections are correct and tight
Battery voltage maybe
less than 8.5V
Measure battery voltage with the
multi-meter. Min.8.5V can start up
the controller
Battery LED
indicator green fast
Flashing
Check if battery voltage is higher
than OVD, and disconnect the PV
Battery LED
indicator red
When the battery voltage is restored
to or above LVR point (low voltage
reconnect voltage), the load will
recover
Battery LED
indicator red
flashing
The controller will automatically turn
the system off. But while the
temperature decline to be below 50
ºC, the controller will resume.
①Please reduce the number of
electric equipments.
②Restart the controller.
③wait for one night-day cycle (night
time>3 hours).
①Check carefully loads connection,
clear the fault.
②Restart the controller.
③wait for one night-day cycle (night
time>3 hours).
①When it is overload or short circuit, the load have 5 times auto-recovery output
function, which each times delay respectively 5s, 10s, 15s, 20s, 25s.
11. Disclaimer
This warranty does not apply under the following conditions:
Damage from improper use or use in an unsuitable environment.
PV or load current, voltage or power exceeding the rated value of controller.
The controller is working temperature exceed the limit working environment
temperature.
User disassembly or attempted repair the controller without permission.
The controller is damaged due to natural elements such as lighting.
The controller is damaged during transportation and shipment.
9. Technical Specifications
Any changes without prior notice! Version number:V2.2
12/24VDC Auto( Lithium battery do not automatic identification system voltage)
Battery input voltage range
Rated charge/discharge
current
Max. PV open circuit voltage
60V( at minimum operating environment temperature )
46V( at 25℃environment temperature )
100V( at minimum operating environment temperature )
92V( at 25℃environment temperature )
( Battery voltage+2V)~36V
( Battery voltage+2V)~72V
Lead-acid battery: Sealed(Default) / Gel / Flooded/User; Lithium battery:LiFePO4/ Li-NiCoMn/User
Equalize Charging
Voltage
Sealed :14.6V/Gel:No / Flooded:14.8V/User:9-17V (×2/24V)
Sealed :14.4V/Gel:14.2V/Flooded:14.6V/User:9-17V (×2/24V)
Sealed/Gel/Flooded:13.8V/User:9-17V (×2/24V)
Low Voltage Reconnect
Voltage
Sealed/Gel/Flooded:12.6V/User:9-17V (×2/24V)
Low Voltage
Disconnect Voltage
Sealed/Gel/Flooded:11.1V/User:9-17V (×2/24V)
LiFePO4:14.5V/ Li-NiCoMn:12.5V / User:9-17V (×2/24V)
Low Voltage
Reconnect Voltage
LiFePO4:12.8V / Li-NiCoMn:10.5V / User:9-17V (×2/24V)
Low Voltage
Disconnect Voltage
LiFePO4:11.1V / Li-NiCoMn:9.3V / User:9-17V (×2/24V)
Temperature
compensation coefficient
-3mV/℃/2V( Lithium battery don’t have temperature compensation coefficient)