Thanks guys. The batteries are definitely all in parallel, and voltmeter later in the night was reading about 12.7 volts - I forget to check earlier when MHP wouldn't connect - it refuses to establish its USB connection, which makes life pretty difficult. I'm so addicted to a single USB and power connection now I don't think I could go back to plugging everything in separately any more.
Really surprised it would be fussy about voltage, considering the amount of current it happily disperses to dew heaters etc.
I wonder if its also a sign of problems with a device I have plugged into it. I have no probs running the whole rig off 240V with Jaycar 12V switched power supply I should add - which is the normal mode of operation.
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