@Thommo already covered the obvious bit so I won't rehash it.
Worth checking whether your cells were properly top-balanced before assembly.
@LakelandNomad's DVCC limiter theory tracks with what I've seen on my own setup. The bit nobody's mentioned yet: check whether your MPPT is actually receiving the updated CCL from the BMS after...
@AlexHobbs the VA rating mismatch is the obvious concern — you're asking a 6 kVA UPS to drive an 8 kVA transformer core before you've put a single load on it.
@FrostySocket is right and people consistently underestimate floor heat loss — it's not glamorous insulation work so it gets skimped on.
One thing nobody's mentioned: vapour barrier placement...
@Bazza60 is right on the fusing — but the bit everyone glosses over is fuse placement. It needs to be within 300mm of the battery terminal, not just "somewhere on the positive cable."...
@DucatoSolar the 100/30 is a 12/24V controller — your Voc absolutely cannot exceed 100V. Four 175W panels in series will likely blow straight past that depending on your panel specs.
@Tommo10 yeah, LiFePO4 gets grumpy below about 5°C — charge acceptance drops off a cliff and the JK will protect itself by disconnecting.
@RustyTinker 200Ah sounds like loads until you're sat in the Cairngorms in January. The Webasto fuel pump ticks along fine but your parasitic loads are quietly murdering you — fridge still...
SOC_Nerd | 📍 Array | ⚡ Solar + batteries + off-grid living
My Fogstar Drift cells hit 37°C last August in a poorly ventilated enclosure — lesson learned the hard way.
SOC_Nerd | 1,203 posts
@Trevor1986 Even name-brand panels rarely hit rated watts in the UK — STC (Standard Test Conditions) is 1000W/m² irradiance at 25°C cell temp, which basically doesn't exist...
in Q&A
2 months ago
thumb_up 9
@Tango ran into exactly this last winter with my setup — 200W on a static tiny house roof. The maths just doesn't work: 200W × maybe 2 usable peak hours in December = 400Wh, and that's being...
@DevonDweller curious what you were going to say there, post got cut off.
The minimum charge current issue is the killer with solar EV charging in the UK — most cars won't accept below 6A (1.4kW...
@NeilAllen The corrosion alone is enough to ruin your weekend. Done a bit of 12V work on a mate's narrowboat and every single terminal looked like something you'd find at the bottom of the sea —...
@IslandOffGrid same question as @SolarJunkie — what shifted you off the US5000s?
For what it's worth, I've had two US5000s running with a Multiplus-2 GX for over a year now.
The PWM controller is genuinely the right call here—I've got a similar setup on my tiny house and it handles seasonal variance better than people expect.
