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?
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.
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.
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.
Hi @FromU, We attempted to remotely diagnose your EP760, but it appears it is not connected to Wi-Fi, making it difficult to troubleshoot the issue.
Could you please connect it to Wi-Fi and notify us so we can attempt the diagnosis again?
By the way, please note that if you need my assistance, please @BLUETTI_CARE, otherwise, I might not see your message and be able to help you promptly.
Unfortunately, there was a massive Russian attack on the power grid last night and internet temporarily went offline.
We are currently running on generator and EP760 is not charging while generator is running (grid frequency high). You should update frequency protection settings - 51,5 is too low. Most powerful gens operate in the frequency range of 52-53. This limitations made power station literally unusable - even bypass mode is not working and our gas boilers went offline. Can you unlock this settings or push an update for our system? Self-adaptation and Generator button in the app do nothing.
Sometimes EP760 thinks its 50% charged and tries to start but immediately shuts down under load.
Now inverter is connected to the cloud server but anything could happen when workday is over. For 3 hours at least everything will be working. If you cant connect please just try again in 3-4 hours.
Inverter SN is EP7602403000081400
Faulty battery SN 2243006458136
Hi @FromU, For this issue, please ensure all firmware is updated to the latest version, including IOT, DSP, ARM, BCU, and so on.
Then, enable the generator mode in the Bluetti app and reduce the charging power. This will help with charging in situations where the grid is unstable.
Please click this link for reference.
Hi @BLUETTI_CARE,
Sadly nothing has changed. All EP760 firmware was upgraded to the latest version. System with 2 batteries (one normally performing and one bugged) discharges in shorter time than system with one well-functioning battery. Bugged battery cant even be accurately calibrated. As I can see this issue cant be resolved without battery replacement.
As for generator issue - problem is not with power output, but with max frequency protection of EP760 (51,5 hz) that cant be adjusted. So our generator (52 hz frequency) will never charge our EP760.
Im applied for advanced user. But is this settings changeable in Pro mode?
Hi @FromU, We have escalated the issue to a senior engineer.
Please provide us with your account details, or add their WhatsApp account, so you can directly connect online to resolve the issue.
It could be a battery issue or an overcharge/overload protection activating. Try checking the battery health or consult Bluetti support for further troubleshooting.
Hi @BLUETTI_CARE,
We were granted access to the Pro mode and it solved our generator frequency issue.
Faulty battery currently disconnected from EP760 - we need working system for our boilers during blackouts. If you want to test it online we can connect it back, but we cant guarantee stable internet connection 24/7. Bluetti EP760 also rarely reconnects to wifi after power outage - it should be done manually.
If there is little hope to solve this strange behavior maybe we should stop beating a dead horse and ship battery to the service center?
If you need our login to the app or any other information - i can DM you.
