Does the charging outlet at the house have to be 20 amps ? I have a regular 15 amp outlet witch is outdoor rated and grounded (GFI) 3 prong plug. I see they call for a 20 amp extension cord no longer than 25 feet. . But these rated at 20 amp all have the "tee' plug where one prong is horizontal. Of course thay are meant for 20 amp outlets. On my 15 amp outlet, I can only use the 3 prong plug and the heaviest duty they go up to is 15 amp rated or 14 gauge. So I have a 25 foot 15 amp rated extension cord charging my Hisun Sector e... Is that OK ? The cord doesnt feel hot or anything. Is this a fire hazard? Will it hurt the utv ? Thanks, Bill