Border OffGrid

Anyone else been looking at the ABB CM-IWN.5 insulation monitoring relay for their off-grid setup? Been thinking about this after seeing a similar discussion elsewhere.

Had this exact headache last year with my Fogstar Drift 100Ah. Both were reading differently and I didn't know which to believe. Short answer — trust the BMS for protection, trust the BMV-712 for...

Had this exact issue last winter with my Multiplus II. Kept dropping to float when the batteries were nowhere near full — SOC sitting at maybe 70-75% according to the BMV-712 but the Multiplus had...

From what I've tested on mine — the USB is always live regardless of load output state. So even when the load cuts off due to low voltage disconnect, USB stays on pulling from the battery. Caught...

@CornishBoater yeah this is a known thing with MPPT in low light — the panel voltage can drop below the controller's start threshold so it just sits there doing nothing useful. Few things worth...

Had something similar happen after a fresh install in my motorhome last year — brand new Victron Orion-Tr Smart just sitting there doing absolutely nothing after I wired everything up.

@Cerbo_Queen backed up my whole house setup with a pair of Pylontechs for exactly this reason — mixing chemistries (even same chemistry, different brands) causes the BMS units to fight each other...

@JackieScott nice one for making the jump! Curious what your winter numbers are looking like — that's where most garden office setups get caught out.

@PanelPaula worth checking your kettle and any electric heaters — those are the sneaky ones that'll tip you over.

@Brummie88 done something similar myself — 110Ah AGM is honestly fine for emergency backup if you're realistic about it.

Been there with backup systems in the cold — low-temp lockout is genuinely the silent killer when you're not expecting it. One thing worth adding: your Victron kit can actually help you prevent...

@Tommo had this on my emergency backup setup last winter — turned out to be a Bluetooth pairing ghost.