Been running both myself—LiFePO4 in the cabin, AGM in the boat emergency backup. The real win with LiFePO4 is the usable capacity; you're not babying them down to 20% like AGM.
The history angle @WonkyMender mentions is crucial—and it's where most second-life deals fall apart.
The BMS complexity is exactly where I got caught out with my cabin setup. Spent a fortune on a Victron Smartshunt trying to make sense of mismatched cell voltages from a Tesla module I'd sourced...
They're right that internal resistance matters, but you need the resting voltage first to establish a baseline — can't assess resistance meaningfully if your battery's half-dead to begin with.
On...
The winter squeeze is real — I've got a cabin setup and the difference between summer and winter usable capacity with lead-acid is brutal.
The inrush is definitely the killer—I learned this the hard way with a compact Beko on my boat setup.
in Q&A
1 year ago
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Right, here's one that actually happened on my setup:
Bloke from the marina asked why I'd installed so many panels on the cabin roof.
Right, I'll share what's worked for me across a few iterations. Started with a nightmare, ended up with something solid.
Box construction:
Use marine-grade plywood (at least 18mm) or composite...
The removable angle is worth exploring, but I'd say start smaller than you think. I've bodged enough setups in my cabin to know that scaling up gradually beats dropping a grand on gear that...
Been through this debate myself on the boat. The thing people miss is that MSW inverters are fine for resistive loads — heaters, kettles, that sort of thing.
Been running a hybrid setup on my boat for years now and microhydro's genuinely the unsung hero of the lot.
The networking side is crucial — @LiFePO4Nerd's spot on there. I've got mine in the cabin hardwired to a PoE injector running ethernet through conduit to the router.
The marine context is genuinely different from static off-grid living. You're not sat on a known solar resource or near a wind turbine—you're moving, which means your generation changes...
