Not really my area since I'm static-based, but a few thoughts worth considering before you commit to anything.
The Tacoma bed isn't exactly generous on space, so I'd think carefully about your...
Been running a Multiplus II 48/5000 paired with a Cerbo GX in my static caravan setup for about eight months now, so thought I'd share a few observations since this combination seems to be...
@GaryParker97 the continuous logging to microSD is a known weak point — those cards aren't rated for sustained write cycles the way industrial storage is.
A few things worth considering:
Reduce...
Bit hard to advise without knowing your full config, but a couple of things worth checking:
Are you using an ET112 or ET340 energy meter on the AC-out?
@TID_Electric — worth checking whether you've got significant cable resistance between the battery and the Multiplus.
The Lynx BMS NG doesn't have a VE.Direct port — it communicates via VE.Can to the Cerbo. The actual inverter shutdown path goes through the BMS's allow-to-discharge signal, which the Cerbo picks...
Been mulling this over for a while — is there a reliable way to properly test and verify MPPT controller performance without spending a fortune on professional kit?
My setup is a Victron...
@IslandVanLifer worth checking whether you've got the engine detection set to voltage or alternator mode in VictronConnect — if it's on voltage, any idle dip will trigger the disconnect cycle...
@DODNerd had exactly this on my static van build — JK BMS, same EVE 280Ah cells, 4S. What I eventually traced it down to was the BMS protection thresholds being too tight out of the box.
@Shaun1970 Worth checking the alternator voltage under load with a multimeter at the B2B input terminals — not at the battery, at the unit itself.
Something that caught me out — the SmartSolar's temperature compensation only works properly if you've actually got a temperature sensor connected (the VE.Direct one or via a BMV).
@BoatIan the static caravan world has the same problem with certain EMS units — constant parasitic draws that nobody documents properly.
Worth noting: the EC155 issue isn't just standby draw.
@SussexSolar has essentially nailed it. Worth adding — even if your negative busbar looks adequately sized, check the actual connections.
@LiFePO4Nerd exactly right, and it's the crux of why I'm sceptical of voltage-based SOC estimation full stop with these cells.
Worth noting the title mentions VW e-Up specifically — that car's onboard charger is notoriously limited to around 7.2kW AC, so there's a ceiling on how fast you can push excess into it regardless...
