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Great - about 20% DOD. Good for cycle life and you have some capacity left for reserve. Hopefully you'll have enough solar insolation in the day with a 10 watt panel to get fully charged or at least spend some quality time in absorb. Quickie: 1.25a needed to replenish / .5a solar current * 1.76 offset = 4.4 hours total. Cutting it close if you don't get 4 hours of insolation - but maybe an Australian solar-insolation map might prove that to be ok.
Personally I'd up that to about 15 to 20 watts - even though 5ah battery replacement costs are cheap, it would cut down on the hassle of driving to the remote site with a bit more power if insolation is limited. BUT now that I think about it, if you are fully charging / discharging the cellphone battery daily, you are only going to get 300 or so cycles out of the cellphone battery anyway. Ok, so even if the panel is on the smallish side, you just take both a cellphone battery and a new 5ah agm to the site yearly.
Personally I'd up that to about 15 to 20 watts - even though 5ah battery replacement costs are cheap, it would cut down on the hassle of driving to the remote site with a bit more power if insolation is limited. BUT now that I think about it, if you are fully charging / discharging the cellphone battery daily, you are only going to get 300 or so cycles out of the cellphone battery anyway. Ok, so even if the panel is on the smallish side, you just take both a cellphone battery and a new 5ah agm to the site yearly.
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