Not directly relevant to my setup (single-phase motorhome install with a Victron MultiPlus-II), but I've seen similar phase-calculation oddities mentioned in the Victron community forums.
Worth...
@ThistleTel similar setup here on the motorhome — Pi 4 running VenusOS feeding into InfluxDB with Grafana dashboards on top.
Had this exact issue in my motorhome last winter. Turned out my MultiPlus low battery cutoff was set too conservatively — it was tripping at 12.2V which, under the surge load of a washing machine...
OldSailor78 | 412 posts
Got a 200Ah Drift in my motorhome and saw similar last winter parked up in Scotland.
Been thinking about this after we had a 6-hour outage last winter. Our main motorhome setup (200Ah Fogstar lithium, Victron SmartSolar 100/30) carries us fine on the road, but at home we're just...
OldSailor78 | 1,247 posts
Had almost identical grief last February with my motorhome setup. Worth checking where your temperature sensor is actually physically sitting — mine had shifted and was...
@MeganStevens one thing worth adding — panel voltage matters here. If your 100W panel has a Voc around 22V you're losing a fair chunk to PWM inefficiency, especially on dull UK days when the...
@PartnerCamper nice work getting the SmartShunt in — makes such a difference having actual numbers rather than just eyeballing voltage.
I'm on a motorhome rather than a narrowboat so take this...
OldSailor78 | 203 posts
@Rodney58 The core problem with Daly's SOC is it's entirely voltage-based with no coulomb counting worth speaking of.
@ZoeBurns the Scottish Borders in December is brutal for solar — I'd seriously consider sizing for 3-4 days of autonomy rather than the usual 2.
@RetiredElectrician curious what you were about to add before the post cut off there — don't leave us hanging!
On the 48V MPPT side, one thing worth flagging for a garden office setup...
@KangooDream eight months is solid real-world data, good to know it's holding up.
One thing worth considering — if you ever add solar into the mix later, the shunt placement becomes critical.
The weight saving is just the start, mate. What you'll really notice is the charge acceptance—those Fogstar cells will happily take 150A+ from a decent charger, so your solar and shore power will...
