I work for an installer and I have had a customer have their system drop out. They mentioned that the alarm was “low voltage” but checking on their system the voltage was up around 54V. The system has had issues in the past and just last week we replaced the color control and it was working fine for a fair few days until it dropped suddenly dismorning. One thing worth noting is that when I was setting up the new colour control there was no option to manually set the low voltage, like that which I had seen in this document: Victron & BYD [Victron Energy]
Is there another setting I had to activate to change this value? I am a bit lost on where to go from here so any help is appreciated.
Yes sorry of course. The batteries are 4x B-Plus L 2.5 with a BYD Pro as the BMU with a MultiPlus 48/3000/35-50 then additionally a SmartSolar Charger MPPT 150/70, managed with the BMS. System dropped about an hour ago, there was a larger consumption than usual a few hours before and then nothing, See the following image. Got the customer to reboot the system via the color control but no luck.
Bmu is the battery management unit, i tend to interchange the terms, ill stick to BMS.
There does not appear to be a cerbo installed no.
As for control these are the settings i have in VE configure with additionally the relay open at 40V, and clears at 42V.
On site now and the fault itself is pressent in the Multiplus, low battery voltage alarmed and dc rippled warning
“ The inverter will shut down if it detects a too high DC ripple. The LEDs will signal shutdown due to high DC ripple. The inverter will wait 30 seconds and then resumes operation again. If after 3 restarts, the DC ripple voltage is still too high, the inverter will shutdown and will not attempt to restart again. To restart the inverter, switch it off and then switch it on again.”
No idea really, without additional information, but it may as well be a wire issue.
Thanks for your help everyone. I managed to get the system running with some more changes in the VE configure, I didn’t touch any of the wiring on site since there wasn’t an electrician with me but if anything happens again I will get them to have a look at the battery wiring!
Whilst probably not your problem I had exactly the same symptoms. I came to the conclusion that the SOC was wildly off due to (as everyone told me) victron gear having exceedingly inaccurate voltage and current measurements. My problem was that in late autumn I would go for many days without a full charge (up to 6) with the displayed SOC going down to 45%. However the real SOC was actually getting down to 25% or less causing the trip out when there was a heavy power draw. I had 10kWh battery (now 20) and a quattro 10k, but a 3kW kettle (or a combination of misc random loads) would trip it. By the time I got there the battery voltages would have stabilised and there didn’t appear to be a problem. I would charge from the mains just the same.
I installed a smartshunt and comparing the smartshunt output with the ‘system’ (ie without using smartshunt) it was easy to see what was happening. Each partial charge/discharge cycle found the ‘system’ overstating the real SOC and the error was cumulative.
This was fixed by using the smartshunt to set SOC.
That said the victron energy inaccuracy makes grid usage, consumption and solar yield produce rather odd results that are not compatible with reality, I am setting up a separate measurement system in Home Assistant to evaluate this. Currently, the overall efficiency comes out at 75-80% but I think its actually much better than this. The battery seems to be well in spec at high 90’s of % assuming the smartshunt is pretty accurate (which I think it is). I will report in a few months when I have results.
