Hi Everyone,

I have been trying to help one of my neighbors with a problem he is having with his system.

Sunsynk 8kw

4 x Hubble AM2 batteries (1 recently installed)

The new battery was installed on the 12 Feb system however ran fine until the 5th of March when the SOC's started jumping between 0% & 100% SOC.

The system refuses to push/pull any power to/from the batteries.

When the grid is disconnected it switches off.

The battery is however recognised in the BMS menu and show the correct battery info i.e. 200Ah Voltage @ 52V or thereabouts

I spoke yesterday to Hubble and had them check the batteries and update all the firmware to the latest version for me (was already up to date as far as I could see). Everything checked out 100% according to them.

I also had the Inverter updated yesterday to the latest Firmware, is currently on Protocol Version：V0.2.0.1MAIN：6027-0717HMI：0000-E43D

Subsequent to the updates the SOC now jumps between 0% & 39% and still refuses to either charge or discharge the battery at all.

If I switch the Battery from Lithium to Voltage, the voltage reading on the front screen of the inverter seems to chase whatever I set the desired voltage for in the work mode settings. So, if I set the Voltage in the Work mode setting to 53.6V, the SOC on the inverter might reflect as 48V but starts increasing until it gets to 53.6V, no power going in/out the battery. If I drop it to 46V the voltage on the display drops down to 46V. I unfortunately didn't have a multimeter with me so couldn't check the actual voltage.

The guys from Hubble were saying that they have had a few problems in the last few weeks from Sunsynk inverters with similar issues.

Does anyone have any suggestions as to where the problem could be and steps for how to resolve this problem ?

I think I am going to go back with my multimeter to check his battery connections for voltage and perhaps disconnect all; but one battery and see if it works like that.

Were the batteries properly balanced before the new one was added?

1 hour ago, mzezman said:

Were the batteries properly balanced before the new one was added?

Not sure, they did work just fine from the 12th of Feb till the 6h of March.