Solar? I Imagine it would be nice to have a solar panel to keep the starter battery charged up if your CMNS energy unit is not in use for a while.
I do not think that would be necessary. A cold fusion generator might need a stand-by battery to start up. Or perhaps a supercapacitor. However, if the battery charge dropped, the device could turn on for a while to recharge it. It would be a good idea to run the generator from time to time anyway, especially if it is mechanical. A thermoelectric generator might be left for months without running.