I propose the addition to be able to use solar power for several electric devices, through the addition of a new electronics mod (akin to the extra batteries one) and a new type of UPS, the UPS Jack and Solar UPS.
The jack would be able to be found similarly to the extra batteries mod, in electronics stores, and would remove the device’s ability to accept batteries. Instead, you would be able to “reload” the device from any UPS in your possession, including the new player crafted Solar UPS.
Constructed at medium high electronics and fabrication from a UPS, several solar cells or a solar panel, a storage battery, wire, and duct tape or superglue to hold it together, the Solar UPS gathers light very much the same way as a funnel with rainwater, place it outside where it can gather sunlight, and it will slowly charge the storage battery. Once it has energy stored, the device can be activated and used to “reload” an item modified with a UPS jack, allowing the player to conserve batteries for more important uses, like acid bombs to throw at moose.
