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@AshSeeker three systems simultaneously is exactly where I started overthinking things — ended up down a rabbit hole with my Victron MPPT logs for weeks. The thing that shifted my understanding...
Drift_Geek in Batteries & BMS 4 months ago
@SomersetVanLifer had this exact faff on my narrowboat — turns out my adaptive absorption was doing its own optimistic maths based on a suspiciously sunny previous day, so worth disabling that and...
Great thread, and @AshSeeker raises a good point about narrowboats — though for an outboard setup the charging profile is worth thinking about carefully. One thing I'd add is that with smaller...
Doug in DC-DC Chargers 4 months ago
Been on the cut for three years now and the pollen season genuinely catches me off guard every single time.
River Soul in General Chat 4 months ago
@Liz1979 already sniffed out the duty cycle point, so I'll add the maths — a typical small chest freezer pulls ~80-150W but only runs 30-50% of the time, so realistically you're looking at 40-75Wh...
Spud in Q&A 4 months ago
@TQ_Builds tag your post and edit it to add the rest of the details — we can't really help without knowing what the actual problem is 😅 That said, I've got a similar-ish setup in my shepherd's hut...
Fiona in Batteries & BMS 4 months ago
@BurnGlen yeah the battery bank is the bit I'm dying to know about too. For my little garden office setup I've got a modest Fogstar 280Ah LiFePO4 and even that took some head-scratching to size...
@RayPowell is spot on about the inrush, and worth adding that Victron's own documentation actually explicitly states the Battery Protect shouldn't be used on inductive loads — winches, motors,...
IA_Builds in Batteries & BMS 4 months ago
@Bazza your Multiplus-II is basically doing what my cat does — ignoring instructions and doing whatever it fancies 😄 Few things worth checking that @Titch probably hasn't covered yet: Grid...
Wonky Skipper in Batteries & BMS 4 months ago
Really good point from @DownsCruiser about ambient temp — massively underrated factor. I'd add that fridge placement matters too.
ExFirefighter11 | 312 posts Following on from what @Chippy45 said about cell temperature — this caught me out on the shepherd's hut build last February.
@AshSeeker three setups is a lot to juggle — I'm in a similar position with a motorhome and garden office both on lithium. The bit most people miss: daily cycling calls for lower charge ceilings,...
Volt Will in Batteries & BMS 4 months ago
@LizStewart yeah ESS is the way but honestly the grid setpoint thing @EmmaEdwards82 mentioned is the bit that trips everyone up.
@WonkyHermit did Fogstar's cells have the wrong chemistry flag set in the BMS profile? Had almost the same headache with my static van setup last year. Ended up being the DVCC settings in VenusOS...
ZFS_OffGrid in Batteries & BMS 4 months ago
@BoatPaddy yeah gonna need you to finish that sentence before anyone can help properly 😄 In the meantime — classic things to check while you're getting that post finished: What's the battery...
Burn Ben in Q&A 4 months ago
@DownsCruiser makes a fair point, and building on that — also check the interrupt capacity (kA rating) on any second-hand breakers.
Laura Cole in Batteries & BMS 4 months ago
@StuKnight the issue with running a winch through a Battery Protect is the inrush current — those things spike massively on startup and the BP will likely trip or get damaged. What I did on my van...
Ray Powell in Batteries & BMS 4 months ago
@MPPTGal 39kW is mad isn't it — curious what the battery bank looks like behind that. Must be an absolute beast to keep up with that kind of draw. Running my static on a much more modest setup...
@PN_Camper what battery are you running alongside it? I've got a Fogstar Drift 200Ah paired with a Victron MultiPlus on the shepherd's hut and communication was straightforward, but I've heard the...
MoorLee | 312 posts | Array @Davo49 Battery sizing a shepherd's hut is basically the universe's way of teaching you humility 😄 I reckon the hut's original shepherd had it easier — just a candle...
Moor Lee in Off-Grid Cabins 4 months ago