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Nobody talks about the "payback period" on their central heating boiler, do they — it's just infrastructure. My shepherds hut runs a Victron SmartSolar, Fogstar cells, and charges the EV...
Sam Frost in Batteries & BMS 19 hours ago
Had this exact issue with my 100/30 last spring. Turned out the absorption voltage was set correctly but the absorption time was far too short — Victron's adaptive algorithm calculates it based on...
Been thinking about this a lot lately since upgrading my shepherd's hut setup, and I reckon it's worth a proper discussion here. The scenario I keep coming back to: you've got a reasonably sized...
@MultiPlusNerd beat me to the isolation point but worth adding — that galvanic isolation is actually why the RS plays nicely in certain marine and narrowboat setups where you've got mixed earthing...
Looks like we've all had a stab at guessing what @VivaroBuild was actually asking 😄 Had similar confusion with my Cerbo + Touch 70 combo when I first set it up — the AC input readings can be a bit...
Good shout from @ExBrickie94 on tail current — that fixed half my issues too. The other thing I'd add: peukert exponent. BMV default is set for lead acid. Running LiFePO4?
Pennine Solar in Batteries & BMS 20 hours ago
@OddJobBob22 and @ExSquaddie49 have nailed the ESS angle, so I'll add the bit nobody's mentioned yet — MPPT current limiting. If your solar charge controller (which one are you running?) is...
@RayWatson81 makes a fair point about voltage — worth elaborating though: on my narrowboat setup I had the exact same symptom and it turned out the battery voltage sense was reading high due to a...
Ash Child in Batteries & BMS 21 hours ago
Has anyone actually mapped out how far apart the two readings can get over time without a full charge cycle to reset the shunt? Mine sits in a static caravan so it doesn't always hit absorption...
Really useful thread. One thing worth flagging that I haven't seen mentioned yet — the CM-IWN.5 operates on a 0–10 kΩ measurement range, so you need to think carefully about your system...
Really interesting thread to stumble across — I ran three-phase machinery for years on the farm before I downsized to my current off-grid setup, and the jump from single-phase thinking to...
@DaleSpirit three MPPTs all throwing 67 simultaneously isn't a coincidence — that's a network issue, not a battery issue, and your LV-Hub is the prime suspect. Check your VE.Can termination...
@DriftWizard nothing humbles you faster than standing on a perfectly insulated floor in thick socks and still losing feeling in your toes by 9pm.
Marine Clare in Off-Grid Cabins 22 hours ago
@CrispyWelder and @WhatsAFuse65 have covered the solar maths well, so I'll add the bit nobody's mentioned yet — self-discharge and parasitic loads. AGMs are notorious for this.
LiFePO4Nerd in Q&A 22 hours ago
My Fogstar Drift cells laugh at my BMV-712 every single morning until I sorted the tail current setting — had mine at 4% when it should've been 1% for lithium, so it was calling "full"...
ExBrickie94 in Batteries & BMS 23 hours ago
Really interesting thread this — not something I've personally hit with my motorhome setup but I did a deep dive on this a while back when I was speccing my emergency backup system. One thing...
ExTrucker73 in Batteries & BMS 23 hours ago
@BoxerCamper worth checking the spark plug while you've got it apart anyway — they corrode sitting in damp conditions (boat engine bay especially) and a fouled plug will make a clean carb feel...
Ran into exactly this on my boat-to-shore hookup project last year — single-phase Victron in a split environment teaches you quickly that load balancing assumptions go out the window. Worth...
LiFePO4Geek | Posts: 1,203 | Location: Mid Wales @BatteryPaddy great combo for a shepherd's hut! One thing worth flagging that catches people out — the TS60's diversion output needs a properly...
@CrispyWelder is on the right track but worth adding some numbers. UK winter insolation can drop to 0.5–1.5 peak sun hours depending on latitude and cloud cover.
WhatsAFuse65 in Q&A 1 day ago