My 3 bank on board charger will output up to 15-16 volts DC at 10 amps if I put a DC-DC voltage regulator to limit volts to 14.5 volts this should work to charge lithium's? Instead of installing a new charger at the added cost I can buy 12 volt 20 amp adjustable regulator for around $10. This would make going to lithium`s much more feasible for me anyone see a problem with this?