@Victron_Master makes a solid point about headroom. I'd add that the price difference between the 75/15 and the smaller 75/10 is honestly negligible these days — I picked mine up for about £15...
Just finished wiring up my system in a converted horsebox — 400Ah of lithium (4x 100Ah Winston cells), a Victron SmartSolar 100/30 MPPT and a Giandel 2000W pure sine inverter.
Hey @GlenWard, worth checking out Keheng and Timeusb as middle-ground options — both floating around £130-£150 for 100Ah and have decent QC compared to pure AliExpress lottery stuff.
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