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Your probably talking about 3 dogs battery box and light pole,
I'd go on ebay as you can get the solar set up in a kit with panel and regulator cheaply , or you could use jumper leads and charge it every few days... If its only for led strips the battery will for last ages before it needs a charge
Edit: I don't think its 3 dogs as he's not got a rooftop that I'm aware of.