Theo makes good sense. I feel that the system is running too long; not cutting off and over discharging the batteries. If the controller has a photo sensor to tell it when to come on...charge the batteries, hook up the system, cover up the photo cell to 'fool' the system into thinking it is night and see how long it runs and monitor voltage. I would say the low voltage disconnect is not working, or it is set at too low of a voltage.
BZ, the part #s are good info. That is prety reasonable for Graingers and will save lots of guessing, testing and leg work. Thanks.
