Grumpy Builder

Grumpy Builder

Member

@GrumpyBuilder

Motorhome owner from Armagh. Always tinkering with the electrics.

Armagh, Northern Ireland Joined Dec 2023
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Overview Reviews (0) Posts (35)
Video question adding another battery 24v system 100ah
@GrumpyWarden post got cut off mate, no idea what you're actually asking. That said, classic 24v expansion pitfall — people mix old and new batteries thinking it's fine. It's not.
in Q&A 5 days ago
Victron connect with Multiplus
Been down this rabbit hole myself when I switched the cabin over to LiFePO4 last year. Short answer: no, you can't configure a Multiplus through VictronConnect alone.
in Batteries & BMS 1 week ago
EG18KPV (formerly 6500s) 120/240 Setup, 48V 105kWh Battery & Overkill 100A BMS Install
@WattHamish 105kWh is serious overkill for most cabins tbh. What cells is he running to hit that? LFP I'd assume.
in Batteries & BMS 1 week ago
Dual PowMr 12kw inverters + 30 KWH Battery setup.
@SIE_Electric 30kWh isn't even that wild tbh. My cabin setup taught me fast that 10kWh disappears quicker than you'd think once you've got a decent load profile. What I'd actually be asking is...
in Inverters & Chargers 2 weeks ago
Anyone else struggling to keep the leisure battery topped up on short winter drives?
Short drives in winter are basically useless for charging. Your alternator's doing well to put 10-15 amps into a depleted battery at 14v, and by the time you've done a 20 minute run to the shops...
in Motorhome & Campervan 3 weeks ago
Trolling motor installation on skiff with a small outboard
Bit niche for here but yeah, battery side I can help with. For a trolling motor you want LiFePO4, full stop.
in Batteries & BMS 4 weeks ago
Shed office nearly done but not sure about the battery size for just a laptop and a few lights
@KangooNomad don't forget standby loads. People always calculate their laptop and lights then wonder why the battery's half dead by morning because they left a router, phone charger and some...
in Garden Offices 1 month ago
Victron BMV-712 showing different SOC to my BMS — which one do I trust?
Had this exact headache last year. Short answer: neither, fully. Both are estimating, just differently.
in Batteries & BMS 1 month ago
Experience with Vatrer and their 12V 100Ah Group 24 Lithium Battery
Eight months without a catastrophic failure is basically a glowing endorsement for budget Chinese cells tbh. That said, I'd be watching the BMS behaviour closely at low temps.
in Batteries & BMS 1 month ago
Bought a cheap 100Ah leisure battery off Facebook — worth reconditioning or just bin it?
Depends what type it is. If it's a flooded lead-acid, there's a chance with some desulphation cycles. AGM?
in On a Budget 1 month ago
Short circuit protection on 1000A NG BMS - what current level?
@MrBodge73 that's a classic. Done similar myself. For the actual numbers — on a 24v system with Fogstar cells, your SCP threshold wants to be above your realistic peak load but below the cell's...
in Batteries & BMS 1 month ago
Victron Orion 30A keeps cutting out when engine's warm — anyone else had this?
@BatteryPaula yeah thermal shutdown is the obvious culprit but worth checking the input voltage too.
in DC-DC Chargers 1 month ago
Solar Panel MPPT Tester
@DucatoProject honestly the simplest method I've found is logging your Victron's own data via VRM portal over a few clear days.
in Solar Panels & Controllers 2 months ago
Victron SmartShunt showing different SOC to my BMS — which one do I trust?
GrumpyBuilder replied: SmartShunt wins, full stop. The BMS SOC is usually just voltage-based nonsense dressed up as a percentage — LiFePO4 flat discharge curve makes that completely unreliable in...
in Batteries & BMS 2 months ago
Anyone else struggling to keep the leisure battery topped up on short winter drives?
Wrong forum for narrowboats mate, but whatever. Short runs are basically just exercising your alternator without actually doing anything useful.
in Motorhome & Campervan 2 months ago