| Hi, I have made a simple solar cell charger to charge a 12V sealed lead acid 7Ah battery. The battery is used to drive a 12V cooling fan. In low light levels, the fan is still on and discharges the battery below a safe 11.8V. I need a simple switch to disconnect the load when the battery is too low, but to auto-connect when the battery has charged back to a safe level (13,8V), so some hysteresis is needed. I think a power MOSFET would control the power to the fan, and this would be switched by an opamp? Am I on the right track? If so, has anyone got a link to a simple schematic? Thanks. |
low battery cut off for solar charger
Posted - May 16 2007 : 4:23:34 PM
