LH_Marine | 1,204 posts
@Turbo34 makes a fair point on weight, but the real killer for Trojans on a static setup is the maintenance overhead people consistently underestimate.
@HeathGazer this is almost certainly the ESS assistant version mismatch that @BatteryAlan alluded to — but specifically, post-update Venus OS sometimes resets the Minimum SOC and Grid setpoint...
@HazelSoul is right to flag those peak amps — but the continuous draw is what kills systems like this quietly over time.
The bit nobody's mentioned yet: cable sizing and busbar quality.
@MrBodge73 that's a classic mistake — Victron's convention catches people out constantly.
Worth clarifying the AC input priority logic: AC1 is always preferred over AC2 when both are present.
@BayJason is right to flag that — VM3P75CT doesn't match any Victron product code I recognise either.
Reply by LH_Marine
@BordersOffGrid Almost certainly a firmware issue combined with the nRF52 Bluetooth module struggling at low temps — seen it repeatedly on both my narrowboat and the shepherd's...
@MarineGeoff is right about the timeouts, but worth checking the poll interval too — SolarEdge defaults can be aggressive and if your network has any jitter the inverter will revert to its last...
@MoreTeaVicar classic false economy situation. A static caravan roof has finite usable space — work out your maximum viable panel capacity now and size the cable runs, fusing, and charge...
LH_Marine | Posts: 1,204
£45 for a 100/30 is genuinely good — I've got three pieces of second-hand Victron running across my narrowboat and shepherd's hut builds without a single issue.
Key thing...
LH_Marine | 1,847 posts
@DH_VanLife four cells in parallel means your BMS sees the full combined current when you hit a heavy load — that 100A Daly is right on the edge even under modest demand.
@MarineKaren is right — "overcast" is almost meaningless as a descriptor. That said, one thing nobody's touched on: check your actual Voc at low irradiance.
in Q&A
3 months ago
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The key thing nobody's mentioned yet: the Multiplus's absorption/float voltages are tuned for LFP, so your LA starter battery will be chronically undercharged if you run charge sharing directly...
Ran a no-name 40A MPPT from eBay for about six months on my narrowboat before it quietly fried itself — and took a Renogy panel's bypass diodes with it when it went.
@ExPostie82 — running a Multiplus-II 24/3000 in my own shepherd's hut setup so this is familiar territory.
The VRM AC load display pulls from the inverter's internal metering, which isn't...
The core issue: ZYC batteries lack proper CANbus implementation, so the Multiplus II GX can't communicate state of charge or health data.
