I’ve got 56 minutes left, then my laptop will shut down. And I cannot recharge it, because the ship’s batteries are DEAD. Dead ? You say. – Well, yes – it seems so. Today I disconnected every single of our 6 months old AGM batteries and measured the voltage. It was between 12.8 and 12.7 Volt. That’s not much but it doesn’t mean they’re dead yet. The thing is: If we charge them, the voltage goes up and down as if there’s no battery connected: If the sun shines, we’ve got 13.5 volts, if there are clouds, we’ve got 12.6. If I try to connect something power-hungry the voltage goes down from 12.6 or whatever it is to 10.5 volts in a few seconds. This doesn’t look too good.
What I cannot understand: How can those 4x 100Ah AGM batteries that are just six months old already be dead ? We were connected to shore-power many times and the batteries have never been ‘used’ much. – Our battery monitor NEVER showed a charge less than 60% – and this maybe one or two times. I really don’t get it. If any reader of this blog has an idea how I could check the batteries or do anything about this situation – all input is very welcome !!