You have the choice of ordering this unit according to your needs. The unit can be delivered without the solar panel or the built-in battery. This built-in Gel Battery is recommended in order to avoid battery acid destroying the electronic parts of the unit. There is the choice you keep the battery outside the unit and in that case you can use any type or size of battery. You can order any power inverter and built-in battery charger. Therefore study what type of a " Portable Solar Unit " can serve your needs and ask us for the price, time of delivery and way of shipping.