Quote:
Originally Posted by Ryland
You would have an easier time finding a dc-dc converter that steps down from a higher voltage, so get two batteries and run more then twice as long because you will also be putting a lighter load on each battery.
|
i might as well get a controller then,like this
Amazon.com: HQRP 20A Solar Panel Battery Charge Controller / Regulator 12V / 24V 20 Amp 300W with PWM Type of Charging plus HQRP Coaster: Patio, Lawn & Garden
the two batteries is series to the controler to the car battery
i can mount a switch form the batteries to the car ,that stops the imput when driving down a hill or breaking, that way the alternator can come on