If all you're planning to power is a burglar alarm, use two square dry cell 6V lantern batteries wired in series and replace them once a year like smoke alarm batteries. No need to recharge- - - -they last three days past forever if they're not used much.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!