The BMS thing @Cleggy raised is spot on. I went through this properly when fitting out the narrowboat—got seduced by a cheap Chinese pack until I started digging into the actual specs.
Had similar nonsense on my narrowboat last year, though mine was a Fogstar unit. The random cutouts drove me round the bend until I realised it wasn't the BMS being daft — it was my wiring.
Worth...
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