Anyone else had their Daly BMS randomly cut out under load? Trying to figure out if mine's faulty

I've got a 280Ah LiFePO4 bank (4 x 70Ah EVE cells in series) sitting in my campervan build, managed by a 100A Daly Smart BMS I picked up off AliExpress a few months back. Everything looked fine during initial testing, but now that I'm actually using the system properly — running a 12V compressor fridge, a few USB ports and occasionally a 1000W inverter — the BMS is tripping and cutting all output. No warning, just dead.

When it cuts, I'm pulling somewhere around 70-80A according to my Victron SmartShunt. Cell voltages all look healthy at the time (3.26–3.28V across all four), temperatures are fine, nothing looks obviously wrong in the Daly app. It resets itself after a minute or so and everything carries on as normal. I've checked my connections and the main negative cable is a proper 70mm² run direct to the BMS, so I don't think it's a bad connection causing a voltage spike.

My suspicion is it might be a peak current issue — the compressor fridge motor starting could be spiking way above 100A momentarily, even though sustained draw sits well under that. Has anyone else seen this with Daly units? I'm wondering whether the overcurrent threshold in the app is set too aggressively, or whether these BMS boards just can't handle inrush current all that well.

Has anyone managed to tune the Daly settings to sort this, or is it more a case of upgrading to something beefier like an Overkill Solar or a JK BMS? Happy to hear if anyone's binned their Daly and not looked back.

@TimHarris had the exact same thing happen with my Daly 100A on the cabin build. Turned out to be the BMS hitting its short-circuit protection threshold momentarily under high inrush current — mine would trip when the inverter kicked in.

Few things worth checking:

• What's your load? Inrush from an inverter or compressor fridge can spike well beyond rated current for a fraction of a second
• Check the BMS app — it logs protection events, so you can see why it cut out
• Make sure your cell groups are properly balanced; an imbalanced pack can trigger low-cell-voltage cutoff under load even if resting voltage looks fine

Honestly the Daly Smarts aren't bad for the money but their protection thresholds are quite aggressive. If you're regularly hitting the limits, a JK BMS is worth considering — far better configurable protection curves.

@TimHarris mine did the same thing in the shepherds hut build — check your balance leads aren't loose on the busbars, a slightly dodgy connection causes the Daly to see a phantom low-cell voltage and trips the whole thing like a nervous intern on their first day. Also worth checking the BMS app (if you've got the Smart version) for the low-voltage cutoff threshold — mine arrived from AliExpress set absurdly high at 2.8V per cell, which explains why it was cutting out mid-kettle. Bump it down to ~2.5V and suddenly it behaves itself. If neither of those fix it, the Daly 100A does have a reputation for weak MOSFETs under sustained load — might be worth considering a Victron SmartShunt alongside it just to get proper visibility on what's actually happening.