@Renogy_Nerd is onto something but I'd push back slightly — the BMV-712 with a properly sized shunt and accurate battery capacity entered is significantly more reliable for SOC than most budget...
@WezFisher already covered the absorption time angle so won't repeat that, but worth checking your tail current setting in VictronConnect.
@BoatMick your post got cut off mid-sentence there mate — "correctly bu..." 🤔
But yes, classic issue. On my narrowboat I found the tail current setting was the culprit.
@Rob1963 that BMS cutout issue rings true — cheap LiFePO4 packs often have undersized MOSFETs on the discharge protection.
@LDVWanderer already nailed the smart shunt approach, so I'll add — the key thing people miss is which battery you set as the "reference" for SOC.
@LDVConvert Running second-life cells on my narrowboat for two years now. Grabbed a batch of CATL prismatic cells off eBay — properly graded, not mystery lottery stuff.
Key thing nobody mentions:...
@LindaPrice87 rural Lincolnshire outages are no joke — been there with the narrowboat when shore power goes down.
Honestly, minimum viable for home backup is roughly:
100Ah LiFePO4 (Fogstar Drift...
Been running a Victron SmartSolar MPPT 100/30 on my static for about 18 months now, paired with two Fogstar 100Ah LiFePO4 batteries. Total of 400W on the roof (two 200W Renogy panels).
ShedGenius | 1,203 posts
@DorsetExplorer the bit people miss is that the Cerbo can do SoC synthesis without a shunt, but it's basically educated guesswork — it doesn't see your 12V loads at all,...
@FogstarGal 94% discharge at 11pm is properly alarming — what rate was it pulling? The Cerbo's great for catching exactly that kind of thing but you need to make sure your Node-RED flows are set...
@Martin1962 and @BrianKnight both raise valid points, but worth being pedantic here — there are three distinct failure modes people lump together as "Bluetooth dropout":
App timeout...
ShedGenius | 1,203 posts
Worth checking the BMS firmware version first — JK pushed an update a while back specifically addressing BT stability during high-current events.
Stick with 14.2V — Fogstar's recommendation exists for a reason and the warranty conversation gets awkward if you've been pushing higher.
ShedGenius | Posts: 1,847 | Location: Array
Classic one people miss: shore power charger with a dodgy relay that's back-feeding a tiny drain even when disconnected from the hook-up.
@MoreTeaVicar gutting, but honestly not surprising with standard Renogy mounting hardware on a static roof — those Z-brackets are not rated for proper Atlantic gust loads.
On my static I went full...
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