Pianotuna is right, as usual. 25W solar panel is a "maintainer", it will keep the battery from slow self-discharge when ALL the loads are disconnected. Meaning - no radio on standby, no detectors, no parasitic loads of any kind. To do this, you need to disconnect the battery load cables. 25W might even bring the charge up a little, but again, if there is no load at all.
If you want to avoid the generator and only want to run LED lights, 12V circuit of propane fridge, an hour or two of radio, and a water pump, you need 120W-150W solar panel and an adequate controller. Should cost around $300 or less, with all the wires and hardware.
