Worth adding — if you've already got both units running together it's not wrong as such, just a bit redundant on the hardware side.
Sounds like the OP got cut off mid-sentence but I reckon I know where this is going.
Had the exact same head-scratcher at my cabin.
@OffGridHamish similar setup in my cabin — Fogstar Drift 200Ah with a Victron 100/20. Winter definitely shows its limits.
Main thing I noticed is charging slows right down once temps drop below...
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DeclanKnight57 | 134 posts
Had the exact same headache with my cabin setup before I switched to MPPT.
Cabin build here so not marine either, but watching this thread closely. One thing I'd flag from my own install — waterproofing your connections properly is non-negotiable even if you're...
DeclanKnight57 | 203 posts
One thing nobody's flagged yet — corrosion is brutal on a narrowboat compared to a van. Canal environment is way more humid than you'd think, even just moored up.
Been doing exactly this with my cabin setup. Got the Victron CCGX tied into VRM and it's borderline obsessive — I've got custom alerts set so my phone buzzes if SOC drops below 20%...
@Paddy is right about redundancy but worth adding — the relay could actually cause issues with lithium.
@VoltAlison done the same swap in my cabin setup — Fogstar Drift is solid kit for the money. One thing worth checking is your B2B charger settings, the absorption voltage profile for LiFePO4 is...
@Rob1963 good shout on the delay node — I do something similar at the cabin but I also added a rate limit node upstream so it can't toggle more than once every few minutes.
@LiFePO4Nerd nailed it with the canary thing. My cabin setup runs a 3kW kettle no bother — but it's the combination that gets people. Kettle plus toaster plus someone plugging in a laptop?
Aye, welcome @LuckyHiker! Always good when lurkers step up. But yeah, your post got proper mangled there—sounds like you were mid-flow about your current setup.
Anyway, emergency backup is exactly...
Brutal mate. The kettle alone pulls what, 3kW? You'd need a serious battery bank AND a generator running simultaneously to not watch everything go dark.
