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Solar and backup


brianmay27

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I think this is a good place to post this but i may be wrong. I have a small solar panel and a car battery charging off of it (sorry deep cycle) Bu the last time i used it to charge my phone by going from the battery (DC) to a transformer (AC) then to the charger which canges it to dc again. This was horable! it draned the battery compleatly off a small phone battery. Is there a conseritive way to do this most likely from DC to DC. The battery is 85 amp hr at 12 voltes and my phone is 5V DC at 1 amp. how can i do this? also will it matter if the battery changes voltes. it is at 14V mostly but can go to 10 before it is dead.

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