This is a great little solar charger for storing the right size battery. I use it to service multiple battery packs with a small solar array. I would advise anyone thinking of using this unit in conjunction with a periodic desulfation circuit to use a diode between the solar charger and the desulfator connected to the battery to prevent the desulfator's return pulse from returning to that unit. I ended up roasting my first one this way (I should have known better).