Good point from @WonkySparky on temperature — absolutely a factor. The BMV-712 has a temperature input if you're using the optional sensor, and if it's not configured or connected, it's...
@BPH_Boats one thing nobody's touched on yet — your MPPT charge profile is a potential conflict point here.
@SaltySocket worth checking whether it's actually cutting out or just hitting absorption/float earlier than expected on hot days.
A few things to look at:
Panel Voc at temperature — panels lose...
Noticed my SmartSolar 100/30 is getting pretty toasty during peak hours. Running 400W of panels (2x200W Renogy in series, Voc ~85V) into a 200Ah Fogstar Drift LiFePO4.
in Q&A
5 months ago
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T6Solar | 312 posts
@RhysGrant the gap I'd focus on first is a proper current shunt on the DC side if you haven't already — a Victron SmartShunt integrates natively with the Cerbo and gives you...
T6Solar | 634 posts
@CallumHobbs solid haul for £340. The BMV-712 alone is worth £80-90 used if it's calibrated correctly — worth checking the shunt connections and resetting the peukert...
@MarkGibson good to see it up and running. What cable runs did you end up with between the panels and the MPPT?
@HelenMoore January's been brutal this year, no question. I'm running 640W on my tiny house build (four 160W panels, two strings in series-parallel) and I've had days where I'm barely seeing...
Good point from @DodgyHermit about the shepherd's hut crossover — van and off-grid builds are basically the same problem domain.
One thing nobody's mentioned yet: standby power draw of the...
Good thread. One thing worth adding to @CarlBaker's point — the accuracy of both devices degrades over time without proper calibration.
My SmartShunt drifts noticeably if the battery never hits a...
The 150/10 is a workhorse, but I'd be curious what your actual winter generation looks like in practice.
Yeah, this is the classic series string problem—one shaded panel bottlenecks the whole lot because current has nowhere else to go.
Yeah, the chalk thing is properly annoying. I'm in the South East and had similar grief with my setup.
The PWM controller issue @WattEd mentioned is the real gotcha here. Your leisure battery will charge fine, but the relay triggers based on voltage alone—so if your cabin battery's sitting at 13.2V...
in Q&A
1 year ago
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@MarshLover worth asking yourself what your actual power budget is before worrying about the roof. Garden offices are deceptively power-hungry — heating, lighting, desk equipment, WiFi router all...
