I installed an electric gate opener which came with a transformer to be operated from house current but was specifically made to allow a 12v battery for power outages. Because of the gate's location, I removed the transformer and put in a 7 amp hour gel cell with a "1.8 watt" trickle solar charger. The battery ran down over a couple of weeks, even without using the gate opener. I suspect the the constant battery drain from the receiver may have something to do with this, along with the fact that I live in cloudy Oregon. I bought a 5 watt solar panel to replace the smaller one. It too is indicated to be a trickle charger, although this is probably meant for an auto battery, not a much smaller gell cell. I noticed the battery is at about 14volts when not operating the opener, and I am concerned about over charging. I thought about getting a charge controller, but with such a small battery, could the charging current still be too high? I believe the charging current curve for the controller is likely meant for larger batteries. I also thought about connecting a power zener diode of about 13.5 volts across the battery. Is this a bad idea? My last idea is to get an auto battery, put it in a plastic case, and connect it to the solar panel without any charge controller. Are any of these solutions good or are there other ideas? Thanks
- posted
18 years ago