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Interesting thread — has anyone actually scoped the CAN bus during one of these events? I've been meaning to do this on my cabin backup setup for a while but haven't got round to it. What I'm...
@Smithy on the boat I run a Victron BMV-712 on the main bank and honestly it's the best thing I did.
Good point from @PanelEwan there. One thing worth flagging specifically for UK use — check the transfer switch timing carefully on these units.
@LisaStewart71 ooh yes! Done exactly this on my narrowboat actually 🙌 Cerbo + Node-Red is such a good combo.
@JimKelly also worth checking if your battery voltage sense wires are connected — without them, the MPPT is guessing voltage at the controller terminals rather than the actual battery, and cable...
@VDH_Boats the Cerbo really struggles here because it wants a single battery type for its SOC calculations.
This caught me out with my garden office setup last year. The Phoenix looks like it's seeing low voltage but often it's a voltage sag under load — the battery cables are doing their job poorly...
@DalesWanderer yeah, SunGold is definitely US-market oriented — you'll find it all over Amazon.com but UK availability is patchy at best.
Good shout from @PanelDai on the temp stuff — caught me out on my shepherd's hut build, panels were throwing way higher Voc than I'd calculated on a cold January morning. One thing I'd add: always...
@OffGridHamish The frustration is real. DESS (Dynamic ESS) is essentially running a cost-optimisation algorithm against your tariff schedule, forecast load, and solar prediction — but it logs...
@MickWebb82 the 8× rule is the one that trips people up most with the RS450/200. Your Pylontech US5000s float at 53.2V, so 8× gives you 425.6V max panel input — which sounds comfortable until you...
Davo24 in Batteries & BMS 1 month ago
@OffGridHamish the horror film noise is almost certainly the bearings protesting about radial loads they were never designed for — washing machine motors are built for rotational loads only, not...
Vivaro Wanderer in On a Budget 1 month ago
@TracyMitchell the low voltage warnings in cold weather are almost certainly your battery internal resistance increasing rather than the inverter itself.
Pennine Nomad in General Chat 1 month ago
@TID_Electric — worth checking whether you've got significant cable resistance between the battery and the Multiplus.
@OllieRoss74 done this on my narrowboat with a similar split — 24V house bank monitored via BMV 712, separate 12V starter.
@GlenSimon "frankenstein rack" is doing a lot of heavy lifting there and I respect it enormously. My cabin setup started the same way — grabbed a load of APC UPS batteries from a data...
Wayne Taylor in On a Budget 1 month ago
@Smithy98 same experience with my shepherd's hut setup — I got genuinely curious and started logging actual kWh consumption against what the bill claimed. The discrepancy was eye-opening.
Solar Doug in General Chat 1 month ago
@OffGridHamish I know that feeling. My Cerbo on the static caravan does the same — makes decisions that seem baffling until you dig into the logs. A few things worth checking: VRM Portal →...
@JimKelly classic symptom of the tail current threshold being set too high. If your absorption tail current is set at say 4-5% of battery capacity, it'll drop to float prematurely when the panels...
@GemmaFisher82 spent thirty years watching electricians in sub-stations ignore derating tables and then wonder why things melted — bought a Victron SmartSolar 100/30 for my tiny house precisely...