Bluetti EP760 constantly shuts down - battery fail?

Product Discussion BLUETTI EP Series
1

Bluetti EP760 constantly shuts down - battery fail?

Asking for help with Bluetti EP760 with two B500 batteries (9920Wh of power owerall).

New Bluetti backup station was installed 4 month ago to power gas boilers during the winter outages in Ukraine. No solar panels - only connected to the power grid. Sadly when active usage started so did the problems began.

Theoretically the system should have been fully discharged in 7+ hours if constant power consumption does not exceed 1000W.

Now EP760 constantly turns off when discharged from 100% to 60% (around 3 hours in) and after power returns starts charging process from 0%. Then it jumps from 40% to 100% in a second. The only message is P003 (single cell voltage high).

When connected separately, one battery behaves normally and another (SN 2243006458136) charges only up to 40% and then shows alarm P003 and 100% charge. Basically one of the B500 lost 60% of its capacity from the get go? Or seriously bugged. Is there a way to hard reset it? Or it should be replaced as warranty case?

All possible firmware and app updates installed sucessfully. Two full charge-discharge cycles didnt solve the problem. System is working literally at half capacity or even worse - i think faulty battery also prevents second fully functional battery from charging above 40%. Is there a way to monitor and manage B500 charge-discharge levels separately?

So long story short a faulty B500 battery can show 100% charge when in reality its less than a half of that without sending any error messages and also probably prevents another battery from working at full power when connected.

Any ideas? Perhaps somebody can link PRO version of the app?

2

Unfortunately, PRO mode does not offer specific solutions for this issue. In my opinion, a replacement may be necessary, but perhaps someone from the Bluetti team could provide additional suggestions.

3

Hi @FromU, We are highly concerned about the issue you’ve raised.

Could you please provide us with the SN code of your EP760 and ensure it is connected to Wi-Fi?

We suspect that one of the battery packs may have a single cell with excessively high voltage. We would like to attempt remote access to check the specific battery voltage.

4

Invertor SN is EP7602403000081400
Faulty battery SN 2243006458136

Connected via cloud server and wifi.

At first faulty battery was connected from invertor but we’ve changed the wiring sequence.
Now it is connected from the second battery.
We connected and charged our working battery separately and then connected faulty battery. Now it showing 99% charge but faulty battery probably charged 40% as usual.

Communication box SN is also needed?