Growatt SPF 5000ES Deep cycle batteries charger glitches when floating at 54 volts- No solar

tarek

New Member
Joined
May 2, 2022
Messages
12
Location
Beirut
Hello,
I have installed Growatt SPF 5000 ES connected to grid and batteries without solar panels.
I am using four C10 Luminous batteries LPPT 12200 200AH.
The inverter is working normally, yet something disturbing is happening when utility is charging the batteries. The charger start to raise the voltage with a constant current to reach the bulk charge voltage (57.5 volts) the going down to float voltage 54 Volts.
The float voltage remain stable until the batteries become full then strange change in the inverter charger is happening as shown in the graph. The fan speed is continuously change its speed with the intermittent supply and drain of current from the batteries. I contacted Growatt but no reply from the support team.
Firmware version 040.05.701
In other words, when the inverter finish floating the batteries, the charger becomes unstable.
Any idea or proposed solution?
 

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tarek

New Member
Joined
May 2, 2022
Messages
12
Location
Beirut
It seems there in no solution for this problem which is coming by design. The Growatt inverter after finish charging the batteries to 100%, it starts draining the batteries again via feeding the inverter from batteries in the presence of utility.
This apply to all types of batteries and this is a weakness in the design because the inverter is cycling the batteries.
 
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