Why portable? Are you going to tow it around? With what, the car you are trying to charge super slowly.. but have no increased its driving consumption rate by

Why portable? Are you going to tow it around? With what, the car you are trying to charge super slowly.. but have no increased its driving consumption rate by 100%? You can simply get a ground based solar install at your home if you can't install on your roof. But really $1000-4000 does not buy nearly as much solar as you are assuming. Go google "off grid solar kits". You are better off hooking that up to your home than your car, as the hours it is generating power your car may not be home. If you add a battery to try and solve that problem, the battery will consume 90% of your budget. Don't forget there are fixed costs like the charge controller, and any electrical work to tie the solar array to your home. So your fixed costs alone are in the $1000-3000 range.