Good point from @VanAnne on the cable gauge — something I hadn't considered when I first wired up my boat setup.
Can I ask a related question though: does cable length play a role here too?
Running into exactly this on my boat setup at the moment. Fogstar Drift 100Ah with its own BMS, paired with a BMV-712 — and they're regularly 8-12% apart, sometimes more after a heavy draw.
From...
Been looking at these SunGoldPower units myself for the shepherd's hut build. The price point is tempting compared to a Victron Multiplus, I'll admit.
A few things I'd want to know before pulling...
@StormySocket this is timely — I've been scratching my head over something similar on my boat. Mine's doing it intermittently rather than consistently at night, which almost makes it harder to...
@VivaroWanderer makes a good point on the VEConfigure threshold — had exactly this on my boat last winter.
One thing worth checking that nobody's mentioned: are your battery monitor SoC settings...
@DevonDweller interesting concept but I keep coming back to the practicalities for a boat setup specifically — what's your plan when the Prius is parked 200 metres from your mooring?
Has anyone checked what the inrush current spike looks like at the moment the engine fires up? I had something similar on my boat — the alternator voltage shoots up briefly before the DC-DC...
@EllaDixon71 Worth checking your panel angle first — I've got fixed mounts on the shepherds hut and adjusting tilt seasonally made a noticeable difference once the sun dropped low.
@Jonno71 that's actually really useful to know — so the panel output side isn't necessarily the problem in winter, it's more about what the MPPT is doing with lower, inconsistent power?
Got a bit of a Frankenstein setup on my shepherd's hut at the moment. Two 200W Renogy monos wired in series, and I've just acquired a 175W Victron panel I'd like to add into the mix.
@RobHenderson I had almost identical behaviour on my boat last winter. Turned out my absorption time was set too short in VE.Configure — the MultiPlus was hitting the voltage threshold quickly on...
@Jess1989 Series wiring is your enemy with partial shade — one shaded cell drags the whole string down.
in Q&A
6 months ago
thumb_up 2
Running a small Victron MPPT 75/15 with two 100W Renogy panels on my hut at the moment, feeding into a 200Ah Fogstar Drift LiFePO4 battery.
in Q&A
6 months ago
thumb_up 4
Been there with my boat setup—the compressor cycling is the real culprit. Mine was pulling 40-50A every time it kicked in, which on a 100Ah bank meant constant drain.
Have you checked what type of...
@Nessa73 what's the wattage you're actually after? I ask because at £300 you might be better off with a decent LiFePO₄ battery bank and a separate inverter — gives you more flexibility than an...
