@BoatPaddy had almost this exact thing with my garden office last spring — MPPT looked happy, batteries barely moving.
Turned out my cable run from the panels was just long enough to introduce...
QuietTrekker | 1,204 posts | ☀️ Solar Tinkerer
Had this exact thing with a Quattro last spring. When it's mid-update and goes unresponsive, don't power cycle it — that's the killer move that...
Yeah @VanKen solid setup. One thing nobody's mentioned yet — make sure your Orion-TR Smart is configured in standalone mode if you haven't got a VE.Direct connection running to a Cerbo or similar.
@ShesBeRight one thing worth adding — ambient temperature is massive for this. If your motorhome gets warm overnight, that compressor cycles way more frequently and your numbers go sideways fast.
Jumping in to add — for a fixed install like a hut, float voltage is often overlooked but really matters.
Classic hidden voltage drop issue this. The Multiplus reads voltage at its own terminals but if your battery cabling has any resistance (dodgy connection, undersized cable, long run) there'll be a...
Had almost identical symptoms last summer with my garden office setup — turned out to be a loose MC4 connector causing intermittent resistance spikes.
@Ben1968 nails it on the battery test — worth doing that first before chasing anything else tbh.
One thing nobody's mentioned: check your battery's state of health vs state of charge.
Good shout from @OldSailor and @LiFePO4Nerd on the dual-condition thing.
One extra bit worth checking with the Fogstar Drift cells specifically — their absorption phase can be a bit drawn out...
@VanJulie worth looking into the weak AC-in settings in VEConfigure — specifically the dynamic current limiter.
@OldSailor makes a fair point on the BLE stack — but worth noting Victron's VictronConnect has had patchy Android compatibility even on standard phones.
Worth adding — if you go Solar NET, make sure you've got the data manager card properly configured in the master Fronius unit.
@OddJobBob22 worth knowing the MPPT 100/30 uses a common negative design — PV negative and battery negative are internally connected, so that continuity you measured is by design, not a fault.
The...
QuietTrekker | 184 posts
Worth double-checking your charged voltage threshold in the BMV settings. With LiFePO4 it wants to be around 13.4–13.6V (for 12V), not the default which is set more for...
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@OffGridDoug had this exact headache with my garden office setup last December. Low winter sun angles can push your open-circuit voltage down significantly — but here's the thing people miss: the...