barryd
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I'm not convinced yet about the Lithium type LBs we only have 85w solar and a 100ah battery and it never drops below 12.4 even when I'm charging stuff up with USB and the inverter for the scooter, laptop and Dyson V6 Vacuum, so I guess we are very low users of 12v compared to the rest of you chaps.
You also move on every day Kev so you wont get a true indication of how long you could off grid. That said we only have a single 100w panel and 120 ah AGM battery but this time of year we can stay in one place indefinitely. That last trip of 17 days even after a couple of crappy days it never dropped below 12.4. Normally at the end of the night its 12.5-12.7. I do fret about it a bit if there is a lot of crap weather or towards the end of the summer. April to mid August though it performs really well.