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Done something similar on my narrowboat before scaling up, so this brings back memories. For occasional weekend use, you genuinely don't need much.
Marine Ollie in Off-Grid Cabins 4 months ago
@MrBodge65 similar boat (literally) — I run a Victron Multiplus-II 24/3000 on my narrowboat and the MPPT combo is solid once ESS is dialled in properly.
Running a small chest freezer off-grid and trying to work out if my battery bank is going to cut it overnight without the solar doing anything. I've got a single 200Ah 12V lithium (Fogstar Drift)...
Taffy62 in Q&A 4 months ago
@KangooDream the frequency-shift thing with the SMA is the bit that catches people out — the MultiPlus-II needs to be able to raise mains frequency to signal the SMA to curtail output, which works...
@WonkyHermit ha, the narrowboat refit curse strikes again — you convince yourself you need everything upfront then end up with a graveyard of unused components bolted to a bulkhead. Quick question...
Forest Boater in Batteries & BMS 4 months ago
Same logic holds on a narrowboat too — which is where I run my 24v Victron setup. The thing people don't always consider when crossing from mobile builds into static installs is voltage drop over...
HalfAJob in Off-Grid Cabins 4 months ago
Really interested in this thread as I'm trying to figure out something similar for my narrowboat setup.
@TracyAllen and @MasterCamper have nailed the tail current angle, so I'll add the next diagnostic step: once you've sorted the tail current, actually watch your cell voltages during that final...
Daily Solar in Batteries & BMS 4 months ago
Been running a Pi 4 (2GB) with Venus OS Large for about eight months now logging data from my Multiplus-II and a couple of MPPT controllers out in my garden office setup.
Been mulling this one over since I nearly did something similar on the motorhome build — anyone here actually run a Victron isolation transformer downstream of a UPS rather than straight off the...
Alex Hobbs in Batteries & BMS 4 months ago
@LutonCamper worth checking whether your minimum SOC is actually being respected or if ESS is treating it as a suggestion rather than a hard limit.
ExBrickie in Batteries & BMS 4 months ago
@QJ_Builds — tale as old as time with 24V builds. My motorhome conversion taught me that most people undersize cables by calculating at 12V loads and forgetting to halve the current at 24V, then...
Been having a weird issue on the boat lately and can't quite nail down the cause. Running a 24v system — Victron MultiPlus, 200Ah of Fogstar Drift lithium, and a mix of solar + alternator...
Breezy Drifter in Q&A 4 months ago
Right, so I lived this exact soap opera on my Ducato-based motorhome for about three weeks before I cracked it. The villain in my story was the charged voltage threshold in the SmartShunt...
Ducato Dream in Batteries & BMS 4 months ago
Bit of an odd one posting here since I'm more of a van person, but I've been helping my mate sort out his garden office and the thermal drop-off once the sun disappears is genuinely shocking.
JH_Power in Garden Offices 4 months ago
@PhilJackson my narrowboat spent a fortnight in Inverness last autumn and my Fogstar 100Ah basically became an expensive paperweight with a Victron sticker on it.
Really interesting thread — I'm facing a version of this on my narrowboat rather than a garden office, but the principle is identical. One thing nobody's mentioned yet: have you looked at your...
@Bazza the key thing nobody's mentioned yet is charge efficiency factor. In the BMV-712 settings, if you've left it at the default 95% rather than dropping it to around 99% for LiFePO4, it'll...
Carl Baker in Batteries & BMS 4 months ago
Running a compressor fridge overnight on a single 100Ah leisure battery is genuinely borderline, and I learned this the hard way on my motorhome before I expanded the bank. A typical 12v...
Squib82 in Motorhome & Campervan 4 months ago
Been scratching my head over this one with my van build and thought it'd be worth opening up a discussion here. I'm running a Victron Orion XS 1400 for DC-DC charging and trying to get the remote...