You shouldn't take an off-board charger and put it on the golfcart and use it like an on-board charger. They're just not designed for that kind of use and can get damaged. Off-board or portable chargers are not made to handle all the bumps and potholes. On the flip-side, if you currently own an on-board charger that is wired into the cart, you can take that on-board charger and affix a DC plug and use it as a portable charger (off-board). In recap: If you're taking an on-board charger and using it off the golf cart, you're good to go! But, you should not take an off-board (portable) charger and put it on the golf cart and use it as on on-board charger.