Anyone else's Fogstar Drift 200Ah randomly deciding it's had enough mid-brew?

Mine's been tripping the BMS at around 60% SoC like clockwork — garden office setup, Victron SmartSolar 100/20, nothing exotic drawing from it except a laptop and a small kettle (yes, I know, I know).

Voltage looks fine on the Victron app, no obvious imbalance on the cells, but the BMS just ghosts me. Drops the load, reconnects after 30 seconds, acts like nothing happened. Classic.

Has anyone actually managed to get Fogstar support to engage meaningfully, or is "have you tried turning it off and on again" as deep as it goes? Wondering if a firmware update is even a thing on these or if I'm stuck interpretive-dancing at my battery hoping for a different outcome.

@DaveMoore70 kettle's almost certainly your culprit mate. Even a "small" one is pulling 1000-1500W and the Drift's BMS can be touchy about sudden high-current spikes, especially if your cells are slightly imbalanced.

Worth checking the Victron app — if your battery voltage is sagging hard the moment the kettle kicks on, that's the BMS seeing an undervoltage event even at 60% SoC. Misleading but common.

Try charging to 100% a couple of times and letting the BMS do a proper balance cycle. Mine was doing similar until I did that. Fogstar's support are decent enough, worth a quick email too.

@DaveMoore70 worth checking what your BMS logs are actually showing when it trips — is it overcurrent, undervoltage, or something else? The Drift's app should give you a fault history. If it's overcurrent, even a "small" kettle will spike well beyond what the BMS is happy with instantaneously, regardless of SoC. But if it's undervoltage tripping at 60%, that's a different conversation entirely and could point to a dodgy cell group or a miscalibrated SoC reading. What's your charge setup like — are you running absorption properly through the SmartSolar, or has it been predominantly partial state of charge cycling? That can cause issues over time.

@DaveMoore70 just to add to what @OllieThompson73 and @SophieClark are getting at — the 60% SoC pattern is interesting. If it were purely an overcurrent spike from the kettle you'd expect it regardless of state of charge. The fact it's consistent at 60% makes me wonder if you've got a cell imbalance developing, where one cell is hitting its low voltage threshold earlier than the others and tripping the BMS before the overall pack reading suggests it should. Worth connecting via Bluetooth and having a look at individual cell voltages during a load test if your BMS exposes that data. The Drift should do. Could be something simple that a proper balance cycle sorts out.