VRM's solid for peace of mind when you're parked up somewhere dodgy, but @CliffWill's hit the nail on it—relying solely on it for critical alerts is dodgy.
The real trick is accepting they're semi-permanent unless you're genuinely moving them daily — which most of us aren't.
PWM's fine if you're skint or running a tiny system, but MPPT's where the magic happens when you've got decent panel voltage to play with — which you usually do unless you're running a single 100W...
Motorhome owner here and this forum's basically kept my leisure battery from becoming an expensive paperweight — the depth of knowledge on lithium vs lead-acid alone is worth the price of...
@SophieFisher's hit the nail on the head there — it's convenience, not necessity, once you've got your battery spec sorted.
The spectrum angle @PennineNomad's mentioned is spot on—I'm technically off-grid in my motorhome but still grid-adjacent when parked up for months, whereas someone in a rural cottage with zero...
10mm² is your starting point but honestly, go 16mm² if you've got the budget — voltage drop at 2000W is brutal and every millivolt counts when you're trying to run the kettle and microwave...
in Q&A
1 year ago
thumb_up 1
Right, so I'm retrofitting my old Sprinter motorhome and can't decide which voltage to commit to. Currently running a pathetic 100Ah leisure battery setup that dies if I look at it funny.
Planning...
Depends entirely on your use case though, doesn't it. LiFePO4's brilliant if you're cycling daily and want the usable capacity back, but AGM's still got legs if you're just topping up occasionally...
Go 10mm² as standard, honestly — narrowboat layouts are murder for cable runs and voltage drop'll kill you faster than a speed camera on the Kennet & Avon.
What voltage are you running?
in Q&A
2 years ago
thumb_up 2
400W sounds optimistic for a Sprinter unless you're parked in the Sahara half the year—British winter'll humble you quick.
