how efficient is nature energy convert to electricity? (N1 %, 10%-90% ?)
Electricity save into battery, (N2 %, lost 1- N2%, 50%-80%?)
electricity come out from battery, convert into mechanical motion, (N3 %, 50%?)
Battery life is about 3-5 years, replace will cost $1000-$2000
Current will be 500A- 1000A in/out battery to drive a car, lots of heat lose and fire risk.