Mate, on a narrowboat you're voltage-limited more than anything else. Series gets you higher voltage which plays nicer with long runs from roof to cabin batteries, but four 400W panels in series...
The thing about LiFePO4 that sold me is the cycle depth. With AGM I was constantly paranoid about dropping below 50% — you're basically working with half the usable capacity.
The thermal stability argument is the winner here. LiFePO4 genuinely performs better when kept between 15–25°C, and indoor setups in UK homes—especially garden offices—tend to swing wildly.
Depends what you're running tbh. If it's just keeping a fridge topped up, a relay's fine. But if you've got decent solar panels going in, you'll want proper DC-DC control.
The thing with relays —...
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