After wondering why it wasnt switching i came to realise i was looking at the connectors back to front and upside down, compared to the installation manual diagram.
I’m usually very good at wiring, but made the mistake of connecting the relay onto the voltage sense pins, which are on the opposite end.
So i have now corrected this and the v sense alarm is now no longer a thing.
Thanks all for your help in troubleshooting, and apologies if I wasted anyone’s time.
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guystewart
(Guy Stewart (Victron Community Manager))
42
Although it’s a bit humbling to admit something was from an installation issue, it really does help others who might have the same issue investigate if their cause is the same.
I have edited out the self talk to make it clearer as the accepted solution.
I wondered if there was a way to pre-charge the input caps on the Multiplus series.
I used to work on a fairly large three phase inverter that had a push button on its control panel to pre-charge the input caps.
With the Victron stuff, I just bridge a 200 watt 120v light bulb across one of the (open) battery breakers to pre-charge the 24v bus on my system. (The MPPT controller also has some fairly large filter caps as well.)
Only takes a few seconds, and once the blinky lights start flashing on the MPPT controller, I close in the breaker and remove the light bulb.
Connecting the V-Sense connections to the busbars through a 2-5A fuse (both poles), does the trick. The main caps are charged through the internal resistors between the V-sense inputs and the B+/- connections. This does the precharge, also on other products with V-sense terminals separate from Battery terminals.