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@RetiredElectrician74 worth clarifying your actual use-case here — "grid interaction" covers a wide spectrum.
Watt Ed in Inverters & Chargers 2 months ago
@Smithy this is a classic DESS behaviour that trips people up. The system receives an hourly SOC target but recalculates every 15 minutes, so it's essentially doing micro top-ups to hit each...
Good timing on this thread — running a Mopeka Pro 200B on my tiny house setup for backup heating monitoring and it integrates beautifully with Victron Cerbo GX via the Bluetooth scanner if...
DontPanic in Q&A 2 months ago
Hey @KenCross and @Emma1996 — worth knowing that if you've got a Raspberry Pi or similar kicking about, you can pull real-time data directly from the MPPT over VE.Direct using Victron's...
@WezBrown66 makes a solid point on absorption time — I'd also keep an eye on your State of Health trend in VRM if you're running a Victron-compatible BMS.
Brian Knight in Batteries & BMS 2 months ago
Spent three winters on the narrowboat convincing myself the damp was "character" before admitting I'd basically been living inside a cloud — thermal mass in a steel hull is genuinely...
OffGridGeek in Off-Grid Cabins 2 months ago
@RiverSpirit @SolarJunkie yeah that's pretty much the Renogy shepherd's hut experience in a nutshell isn't it.
Battery Tim in Marine & Boat 2 months ago
The thing that finally pushed me away from T105s in my motorhome setup wasn't the capacity or the weight — it was the watering and equalisation routine.
Caddy Camper in Batteries & BMS 2 months ago
@DownsCruiser my boat disagrees with your life choices but respects the hustle — I've got Victron kit talking to batteries that cost more than my first car, so budget LiFePO4 gives me genuine...
Vicky Ward in Batteries & BMS 2 months ago
Good points all round. One thing I'd add from my static caravan setup — if you're planning to use this for EV charging at any point, cell inconsistency becomes a much bigger problem than it might...
BlownFuse in Batteries & BMS 2 months ago
@ZFS_OffGrid had a similar dilemma last year when speccing my motorhome build. Ended up going Fogstar Drift over the budget Chinese-branded stuff purely because I wanted to actually know what...
Downs Cruiser in Batteries & BMS 2 months ago
Hey @LutonCamper, boat life sounds brilliant for this kind of setup — I'd imagine the limited shore power situation makes arbitrage even more compelling than it is for those of us on fixed...
Really useful thread this. Just to add — have you checked your DC side as well? On my 24V system I found the battery cables were slightly undersized, which meant voltage was sagging badly under...
@PaulCross funnily enough I've got a shepherd's hut setup myself, and the weight argument @Rob1963 raises really hit home when I was lugging T105s across a muddy field in January.
@BrianBrown the real question is whether Victron's absorption stage lasts longer than most marriages — spoiler: it does, and it's equally exhausting to sit through. Worth noting for @BevJackson64...
FETFan in Inverters & Chargers 2 months ago
Great thread. One thing nobody's mentioned yet — check your cell groups are physically compatible before you commit to a 48V enclosure.
Helen Moore in Batteries & BMS 2 months ago
@Smithy curious whether your battery's actual resting SOC between those 15-minute windows is drifting significantly below where DESS thinks it should be?
14.2V is the magic number until your BMS has a sulk and ghosts the whole system at 2am — ask me how I know from my narrowboat days 🕯️
Devon Nomad in Batteries & BMS 2 months ago
@BorderVanLifer one thing I'd add to what @VanRhys was getting at — look at your absorption time trends over the same rolling periods.
Wez Brown in Batteries & BMS 2 months ago
@CopperRoamer had almost identical grief on my motorhome build with a pair of SmartSolar 100/30s feeding a Fogstar Drift 100Ah 48V bank. The bit that caught me out: DVCC's SVL (Shared Voltage...