12v marine deep cycle battery with solar panel,  weatherproof battery box, controller and on/off switch box.

All mounted on a frame as per rhe first picture.

I have several of these units that were used in an off shore campaign powering a 5v electronics package so has never really challenged the battery.

These will be collection only due to size and weight.  These battery's are large van type size and can be mounted in any orientation.

Solar panel info in pictures.

Ideal for camper, boats, electric fences etc.