Dual Battery problems

Submitted: Friday, May 27, 2011 at 17:19
ThreadID: 86586 Views:6186 Replies:7 FollowUps:21
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Ok I have an issue with my new dual battery.

It is fully installed and I have a 100ah AGM firststart second battery and a 80ah normal starter battery. in between I have a matson 140ah isolator.
Attached to the second battery I have a power inverter 1500w - 300w 12 v- 240 v
We went on a weekend trip and only hooked up a weaco 40 L fridge which should only draw 0.3 ah
I had a volt meter with me and checked if both batteries were full when we arrived at amp. they were!
After 5 hours my inverter allready started beeping that is switched itself off. because the battery was low.
the volt meter said it was at 10.9 volts.

Can anyone tell me what went wrong here?
Can I fix this problem by using a 12v sigeret lighter socket and putting a permanent volt meter on that? or is 10.9 volt allready very low for a battery
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