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I have been off the grid 6 years and now my system does not want to provide power at night (when source disappears). Batteries (4x 200A12V deep gel cell) do charge and during day all seems fine but problem seems that the moment power use to switch to batteries the system goes down. Could this be the result of a fuse. If so which one most likely. Who can I contact to assist (lockdown considered) or any assistance on what to do appreciated?
Evening here @Carien And I hope your day is better than my dreary lockdown one. :)
A Multi doesn't shutdown for no reason. One though is low Vbat. And that 37.2V you've quoted stands off the page. My own identical Multi came with exactly that as default and I left it there. If that's what it's seeing then it will shut down at 37.2. Let's roll for starters with that 'coincidence'.
Now that's not to say that your batts are faulty, but if that's what the Multi is seeing on it's terminals then you need to find out why. If the batt V is ok, it's likely somewhere in the wiring/cable crimps/isolator/fuse between the batts and the Multi. On either + or - sides. If you're handy with a multimeter it shouldn't be too hard to find a point along the wire-trail where the V is lost.
Try this first and come back.
