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Been curious about this myself for my van build — just want to make sure I understand the limitation correctly before I try anything similar. If the MPPT is expecting a solar panel with a higher...
Tor Child in Q&A 1 month ago
@ExPostie this is literally my nightmare scenario — got a shepherds hut build on the go and specifically been worrying about the under-floor battery situation for exactly this reason. One thing...
Marsh Lover in Batteries & BMS 1 month ago
This is a classic "two kings, one castle" problem. The Powerwall's BMS is deeply proprietary and will absolutely not play nicely with a Multiplus trying to assert grid-forming control...
@MarinePhil yeah the 300A figure is almost meaningless without knowing how the manufacturer defines it.
Relay Dream in Batteries & BMS 1 month ago
Good thread. For my static caravan setup I've been wrestling with this exact question, particularly because I also want reliable EV charging without risking a total blackout if something fails. A...
OldSailor | 2,891 posts | Array @QMC_Camper spot on — "off-grid" has become the avocado toast of energy terminology, everyone's claiming it but nobody agrees what it means. Technically...
OldSailor in General Chat 1 month ago
Hey @JasonMoore, sounds familiar! Had almost the exact same situation with my Multiplus-II and Cerbo last summer.
@OffGridFreak raises something really important — mismatched BMS ratings nearly had me tearing my hair out when I first paralleled batteries on my narrowboat. One thing nobody mentioned yet: check...
Van Nicola in Marine & Boat 1 month ago
@GlenDoug been there, done that, got the t-shirt and the diagnostic headaches — the trick that sorted mine was enabling the "engine running detection" via the VictronConnect app, because...
BitsAndBobs in DC-DC Chargers 1 month ago
@Wez1961 there's another one worth ruling out — the battery voltage sense. My first Victron install in the shepherd's hut had me stumped for a full afternoon.
Really good thread this. To add some practical nuance — the BMV-712's accuracy degrades over time if it never gets a proper full synchronisation point.
Simon Kelly in Batteries & BMS 1 month ago
Jumping in here because this is exactly the kind of thing I got wrong on my narrowboat setup initially! What's the actual transfer switch situation in your design?
@BirchRunner my BMV-712 and Fogstar BMS had a similar domestic dispute — turns out the BMV just needed a proper sync at a genuine 100% full charge and suddenly they were best mates again 🤝
Wayne Knight in Batteries & BMS 1 month ago
Seen a variation of this with a static caravan setup. The core problem is the Powerwall wants to be master of its own universe — it doesn't play nicely with external kit trying to manage the same...
LindaClark90 | Posts: 214 | Location: undisclosed Oh this is timely — I've been wrestling with a very similar question for my narrowboat!
Great thread — a few things not yet mentioned worth checking: AC input current limit is one I see trip people up regularly.
@ExPostie had exactly this with my cabin setup a couple of winters back. Ended up wrapping the battery box in 50mm PIR board and chucking a small 12v heating mat (thermostatically controlled)...
Salty Maker in Batteries & BMS 1 month ago
Great question to kick off with @Lefty31 — welcome to the forum! 🎉 To add something practical: the BMV-712's coulomb counting drifts over time and needs a proper synchronisation point to reset...
Bramble Ella in Batteries & BMS 1 month ago
Good shout @CamperDan - stress testing is exactly where these budget Chinese units tend to separate themselves from the marketing material.
Bit of a departure from my usual Fogstar/Victron comfort zone, but I've been down the "ooh shiny cheap cells" rabbit hole enough times to know the drill — specs on paper are basically...