It sounds like you need a larger battery (27,29,31 series) depending on how much space you have and how much you want to spend. The larger series and more CCAs will help you with this problem. I am running 3 units, power poles, aerators, off my cranking battery. If you don't have an onboard charger with banks for all batteries you would be better off to buy a charger for the cranker and hook it up after every trip to make sure it is always topped off.