Now that we've had a couple of days away from the dock we've worked out that one of the house batteries has a problem.
We have 3 x 220AH AGM batteries for the 'house' and 2 x 100AH batteries for the engine.
We have noticed over the last couple of days that the voltage is getting a bit low and when we tested each of the batteries in turn this morning they seemed fine. When we put them under load however one of the batteries immediately dropped down to 10 volts. Culprit found!
So, with the benefit of hindsight while we stayed at the dock for the last week doing a bunch of cleaning and reconfiguring of the boat we really should have had the shore power plugged in for a couple of days and then run on batteries for a couple of days. That way we would have found this earlier. Anyway, not a big issue but we'll go back tomorrow and get it sorted before we go any further.
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