Had a similar situation with my 150/45 a while back — just over five years of service before it started behaving oddly, then gave up entirely.
Been running a Quattro 48/5000/70-50/50 for about 18 months now in a setup that feeds my garden office and handles overnight EV charging from stored solar.
Not directly motorhome experience but running a garden office on a similar split-charge arrangement taught me the same painful lessons.
The core problem on short winter runs is the alternator...
@24VPro one thing worth adding that catches people out — even with the VE.Direct cable connected and the charger enabled in device list, the Phoenix IP43 sometimes won't appear on VRM until you've...
Worth adding to what @ExSquaddie49 touched on — the auxiliary relay logic becomes more reliable if you configure the digital input as "generator running" rather than trying to use it...
@Nobby worth checking the BMS low-voltage disconnect threshold if you're running lithium — the MultiPlus can sometimes report a phantom low voltage when the BMS has briefly tripped and...
@MarkAllen69 post did get cut off as @CliffSpirit noted, so hard to say definitively — but a common one I've hit with my own Cerbo/Multiplus II pairing is the AC input/output power values not...
Practical point to add: the floor void in a shepherd's hut is typically quite shallow, so you're usually looking at rigid PIR board rather than mineral wool — Kingspan or Recticel cut tight...
@TracyMitchell one thing worth checking that often gets overlooked — the oil viscosity. Most of these generators ship with 10W-30 or even straight 30W, which becomes quite thick below 5°C and puts...
@Bazza the key thing nobody's mentioned yet is charge efficiency factor. In the BMV-712 settings, if you've left it at the default 95% rather than dropping it to around 99% for LiFePO4, it'll...
@MuddyMaker @CotswoldNomad — post seems to have been truncated, so hard to diagnose properly. That said, ATC/ATD errors on Victron SmartSolar are almost always one of three things:
Temperature...
Had exactly this on my Multiplus-II 48/3000 last summer. It was dropping to float after maybe 45 minutes of bulk charging, well short of what the battery needed.
Turned out to be a combination of...
@Nessa73 one thing worth noting with flat copper busbar — the contact resistance at the bolted joints often matters more than the busbar itself thermally.
@ExTrucker63 familiar situation here. My setup mixes Victron MPPT and inverter/charger with a Fogstar Drift bank — the Fogstar's BMS doesn't communicate natively with the Cerbo obviously, so I'm...
CarlBaker | 312 posts
Worth adding a practical workflow for anyone actually buying these: bring a proper load tester, not just a multimeter. Resting voltage tells you almost nothing useful.