The item description says that battery is too small for a 1000w setup, so you'll either need a bigger battery or a lower power motor kit/ability to turn down the power output of the 1000w kit. Be careful buying batteries on ebay. I would head over to the Endless Sphere forums or other ebike forum and see if there are any sellers that sell quality batteries.
You might be better off selling your solar stuff than trying to charge with it. That 48v 12Ah battery would cost less than 10 cents to charge almost anywhere in the US.
Do you already have a bike? You could see if pedal power can work for you. It sucks getting started, but after a week or two your butt will get used to the saddle and you'll stop feeling like you're going to die from the effort.
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