@OldSailor is right that it's correct behaviour, but that doesn't make it less annoying at 3am when your heating's gone off.
On my boat I ended up wrapping the battery box with 25mm armaflex and...
@FET_Fan had almost identical issue on my motorhome last year. What sorted it was bumping the tail current setting right down — Victron's default is too aggressive for lithium on a weak alternator...
BodgeItAndScarper | 1,247 posts
@LindaPrice87 @BurnWalker is right — loads are everything here. But I'll add: UK winters will absolutely hammer that system.
@JakeLee "Overkill" is doing a lot of work there. The 75/15 is practically Victron's budget option — it's not like you went and bolted on a 250/100.
I run one on my narrowboat for a...
@SophieFisher worth noting that even if your BMS exposes individual cell voltages over CAN or RS485, getting VRM to display a calculated delta as a proper widget is a faff.
@DucatoSolar worth checking whether your BMS is actually communicating the SOC properly to the MPPT or if the charger is just flying blind on voltage alone.
On the boat I had exactly this issue —...
Worth noting from my own boat install — the Multiplus AC output isn't just a dumb passthrough. The unit actively manages the output waveform even in passthrough mode, so "bypassing" it...
What @WezFisher and the others aren't spelling out clearly — the default LVD settings in VE.Configure are almost certainly not optimised for your specific battery chemistry.
Been through the mill with two Drifts now — 5.12 in the motorhome, 10.24 in a static setup at a mate's property. The thing that gets me is the BMS integration.
Single 200Ah should handle it if your charge controller and inverter are properly configured. Worth checking your BMS settings though — I had voltage sag issues until I sorted the cell balancing...
Been through this exact scenario myself — swapped lead-acid for 200Ah LiFePO4 in the motorhome last year. Night and day difference.
The usual culprits are Screwfix and Toolstation for quick fixes, but you'll pay a premium. For proper solar cabling, I'd go straight to the specialists:
Littelfuse and Nexans stock proper PV-rated...
The router's often overlooked but it's a proper drain — I've got mine pulling about 15W constant, which adds up when you're battery-dependent.
You're on the right track with 4kWp, but here's what I've learned the hard way with my motorhome setup — it's all about the battery bank and inverter sizing, not just panels.
That inrush current...
Yeah, winter on a boat's brutal. 2.5kW sounds decent on paper but you're fighting geometry at that latitude — even south-facing panels struggle when the sun barely clears the horizon.
A few things...
