This is my set up:
Storage Inverter Givenergy AC3.0
Battery 1 Givenergy Gen1 5.2
Battery 2 added later Givenergy Gen3 5.2
Also a MyEnergi Zappi EV charger
With first battery everything worked fine. After adding the second battery it has failed twice. Sometimes the LEDs are dead, other times all red. The installer had to wait ages to get Givenergy support the first time it failed. He came back, checked connections, charged up the second battery from an external power pack, then it worked for a few days and failed again. Still waiting for a fix after 3 weeks. Gen1 battery still works fine.
My question is this - Is it problematic to mix Gen1 and Gen3 batteries? Should I replace the Gen1 battery with a Gen3? Or is it a duff Gen3 battery I’ve got?
Anyone else had a similar experience?
What firmware are you running on your old 5.2 battery, according to the release notes there have been fixes related to mixed battery capacities in later BMS’s.
And also, is your new 5.2 attached at the first battery that is connected to the inverter, or did your installer connect it after your existing 5.2?
The reason I ask is the old 5.2 (I have one) is 80% depth of discharge so is really only a 4.2kWh battery whereas the new one is 100% DoD (and I think its 5.12kWh but might be wrong). GivEnergy say the largest battery should be first in any battery chain
Thanks for that info. I will pass this on to the installer. I don’t know the answer to the firmware question, but I will find out. As for the connection order, Gen1 battery is connected first so swapping them around might be part of the solution.
you can swap the battery cabling around yourself if you want, turn the batteries off, and the inverter, then unplug and swap them round. The orange plugs are a bit of a pig to get off as they have a locking mechanism to stop coming out, requiring pressing in several places at once, but they just plug in and out