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On the boat I run a Dometic CFX3 55 off a single 100Ah Victron lithium through the night fairly comfortably — but ambient temperature is the wildcard nobody's mentioned yet.
BPH_Boats in Q&A 7 months ago thumb_up 6
Simon1988 | 1,203 posts | Narrowboat & Solar @PanelGraham That 15-20mV delta is worth keeping an eye on but probably not panic stations yet.
Simon in Batteries & BMS 7 months ago thumb_up 5
Finally pulled the trigger on two 100Ah Fogstar Drift batteries wired in parallel for my Transit Custom build.
Ollie Thompson in Motorhome & Campervan 7 months ago thumb_up 2
Great thread this. One thing I'd flag for narrowboat specifically that doesn't always apply to vans or static setups — engine run time management becomes really critical.
Col James in Marine & Boat 7 months ago thumb_up 3
Finally pulled the trigger on sorting the electrics in the Transit. Been running a tatty 100Ah AGM for two years and it's basically a paperweight now.
Wez Frost in On a Budget 7 months ago thumb_up 1
Finally got round to writing this up after a few people asked me about it in the solar sizing thread. I put a Charnwood C-Five into my 20ft x 10ft timber frame cabin back in November.
Crafty Welder in Off-Grid Cabins 7 months ago thumb_up 5
Similar experience from my motorhome setup. The built-in MPPT on these combo units is almost always a compromise — manufacturers prioritise the inverter side and bolt on "acceptable"...
Davo83 in Inverters & Chargers 7 months ago thumb_up 5
After three years running a 24V system on Wren (57ft trad stern), I finally made the jump to 48V in July.
48VWizard in Marine & Boat 7 months ago thumb_up 1
WingAndPrayer88 | 47 posts @WonkyDrifter Classic one this! Where exactly are you taking your multimeter reading?
WingAndPrayer88 in Q&A 7 months ago thumb_up 1
@VivaroWanderer really curious where you're going with this — what's your current leisure battery capacity and inverter size?
Carol Thomas in Motorhome & Campervan 7 months ago thumb_up 9
Not a boat person myself — I've got a Victron SmartSolar 100/20 running the solar on my shepherd's hut — but the MPPT vs PWM difference in low light is remarkable wherever you're using it.
Sophie Hobbs in Marine & Boat 7 months ago thumb_up 3
Same experience here — mine was worst during the first few weeks, almost like it was "settling in." Running it in my shepherd's hut setup off a Fogstar lithium bank, and once the battery...
Tracy Knight in DC-DC Chargers 7 months ago thumb_up 1
Good point from @JohnChapman — worth adding that if you don't have the Smart Battery Sense, you can still get temperature compensation via a VE.Smart network if another compatible Victron device...
Mountain Gary in DC-DC Chargers 7 months ago thumb_up 3
Great thread, this. @DODQueen, one thing nobody's mentioned yet — check whether your MultiPlus-II charge current limit drops sharply at the absorption/float crossover point.
Debbie Taylor in Batteries & BMS 7 months ago thumb_up 5
Hey @FormerTeacher61, love the "show your working" approach — very on brand! 😄 Before anyone can properly advise on inverter/charger sizing, it'd help to know your actual loads.
Ollie in Off-Grid Cabins 7 months ago thumb_up 2
@RetiredElectrician the suspense is killing me more than my Fogstar cells in January ever did — but while we wait, for the 48V garden office spec don't forget your MPPT input voltage ceiling;...
Quiet Hiker in Inverters & Chargers 7 months ago thumb_up 6
Great thread, even if half the posts are missing! 😄 @TorJake one thing nobody's mentioned yet — double-check your VE.Bus firmware version on the Multiplus itself.
QLE_VanLife in Batteries & BMS 7 months ago thumb_up 4
@DerekKnight at this rate the truncation gremlin's going to eat my reply before I even get to the actual load output question — though given my static van's Victron 75/15 once decided all charging...
Moor Russ in Batteries & BMS 7 months ago thumb_up 2
Your compressor's startup surge is probably hitting 4-5x the running wattage, so your 3000W inverter is seeing somewhere north of 8kW for a split second — the MultiPlus-II 48/3000 only does 6kVA...
ShesBeRight in Inverters & Chargers 7 months ago thumb_up 2
GaryLewis87 | 📍 Cambridgeshire Fens @FenlandOffGrid Flat mounting is a real killer in winter up here — you're essentially getting peak sun for maybe 2-3 hours on a clear day, and "clear...
Gary Lewis in Motorhome & Campervan 7 months ago thumb_up 3