@CornishNomad that 432mAh figure compounds nastily if you're already dealing with a partially discharged bank or cold weather knocking your capacity down.
On my narrowboat I ran into something...
Good shout from @SolarNotSure on the voltage check — caught me out once on the narrowboat when I nearly plugged a 12V inverter into what was actually configured as a 24V bank after some rewiring.
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