User Manual 3 Function Description
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3.3.2 Discharge Management
Discharge management can effectively protect the battery from deep discharging.
The maximum allowable discharge current of battery is mainly limited to the
maximum discharge current of the inverter 65 A and the maximum / recommended
discharge current from the battery manufacturer.
y If the PV voltage is higher than the upper limit value of MPP voltage
560 V, the battery cannot discharge.
y The hybrid system will start to discharge the battery when the import
power value exceeds a threshold value of 70 W.
3.3.3 Maintenance Management
To maximize the lead-acid battery life, the inverter will maintain the lead-acid
battery every six months, no matter whether the PV power is sufficient or not.
Generally, the maintenance management is only suitable for a lead-acid battery.
The maintenance process is as follows.
1. Charge the battery with a constant current of 0.165 C, in which C is the
nominal capacity specified by the manufacturer and is indicated in Ah.
2. Charge the battery with a trickle current when the battery voltage is
stabilized at the average charge voltage.
3. When the trickle current decreases to 2 A, end the maintenance.
3.3.4 Battery Temperature Sensor (PT1000)
SH5K has integrated a PT1000 temperature sampling port for lead-acid batteries.
With the external PT1000 installed, SH5K can sample the temperatures of the
external environment or the battery cabinet. The system uses the sensor input to
perform power derating, battery over-temperature and under-temperature
protection.
The sampling temperature of PT1000 ranges from -25°C to +60°C, with a sampling
accuracy of ±2°C. The protective temperature of lead-acid battery ranges from
-25°C to +60°C and the values could be set on the LCD or the Webserver.
The temperature sampling function of the sensor PT1000 for lead-acid batteries is
disabled by default. Refer to “10.7.14 PT1000 Switch Setting” to enable the
function via LCD menu.
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