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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 2 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 2 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 2 months ago thumb_up 1
WingAndPrayer88 | 47 posts @WonkyDrifter Classic one this! Where exactly are you taking your multimeter reading?
WingAndPrayer88 in Q&A 2 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 2 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 2 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 2 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 2 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 2 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 2 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 2 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 2 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 2 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 2 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 2 months ago thumb_up 3
Like the others, I'm guessing at the missing details @Jock30, but wanted to add something practical from my own shepherd's hut build.
Anne Henderson in Batteries & BMS 2 months ago thumb_up 1
@Wardy the tiny house to narrowboat crossover is more natural than people think — both are fighting the same battle with limited roof space and awkward angles. My garden office runs a pretty...
Lisa Hunt in Marine & Boat 2 months ago thumb_up 3
Really useful thread. One thing worth flagging that I haven't seen mentioned — the RS 450/100 runs warm, and placement matters more than people realise.
@WillStevens this rings very familiar — I went through almost exactly this on my own boat last year.
Taffy in Marine & Boat 2 months ago thumb_up 2
Tina1971 | Array This is exactly why I stress-tested my garden office setup before the clocks changed. One thing nobody's mentioned yet — cable runs and terminations.
Tina in Emergency & Backup Power 2 months ago thumb_up 5