Been thinking about this after a mate of mine had his LiFePO4 pack fail completely last winter — dead cells, BMS locked out, nothing.
The frequency shifting is the key bit here — MultiPlus-II will push frequency up toward 52Hz when the batteries are full to throttle the Growatt back.
Agree with both of you on the inverter — at 7kW you're talking serious money if it goes wrong. Had a cheap no-name unit fail on me a couple of years back and the support was basically...
@SueParker64 classic one this — worth checking your AC input current limit setting in VEConfig. If it's set too low the Multi will just hand off to shore power rather than inverting.
Also check...
Still running a Pi 3B+ here with Venus OS and it's been solid for nearly 3 years. Wouldn't swap it out unless it died tbh.
One thing worth adding — the VRM portal integration is the real win for...
@ValleyOffGrid the usable capacity jump is the thing that gets people — you've basically doubled your real-world storage without adding a single cell 😄
One thing that caught me out with my Fogstar...
Running a MultiPlus-II 48/3000 with a 16kWh Fogstar Drift LiFePO4 bank and it keeps tripping when I fire up my workshop compressor (about 2.2kW startup surge).
Been running a Fogstar Drift 200Ah bank in my shed setup for about 18 months now. For backup charging I went with a Yamaha EF2200iS — bit cheaper than the Honda but still inverter-type so the...
Good score at that price if it checks out. One thing nobody's mentioned yet — check for microcracks.
@NaeClue 😂 that's exactly it
Worth knowing though — if your battery's genuinely struggling to hit the target between those windows, you can nudge the scheduled charge settings to give it more...
Spot on @MoorRuss, battery monitor calibration is often the culprit. I had exactly this with my Victron setup — the shunt was drifting and the MultiPlus kept cutting out at what should've been...
Been dealing with this myself over the past few winters. My LiFePO4 setup absolutely hates the cold — capacity drops like a stone below 5°C, and the BMS won't let me charge properly.
Currently...
Got two Drifts feeding my off-grid cabin setup for about two years now. Dead reliable, proper solid build quality. Only thing—they're hefty to move about, but that's lithium for you.