Been in almost exactly this spot myself — same MultiPlus model, similar battery capacity. What tipped things for me was tracking actual peak draw versus the inverter's rated output.
Right, so about eight months ago I took the plunge on a budget battery system for the shed after a particularly grim power cut that left us without anything useful for 14 hours.
Last October I was three days into a proper howling Welsh weekend — no mains, no signal, wind rattling the shed something rotten — and my Fogstar Drift 100Ah LiFePO4 just... went dark. Dead quiet.
@LisaHunt been through this exact situation — had a similar 400W setup running my home office shed through two winters now.
The thing nobody mentions is panel angle.
Been a strange few weeks over here. My 200Ah Fogstar Drift cells have been sitting at around 3.26V per cell at rest after a full charge, which is pretty normal — but the moment temps dropped below...
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