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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by jules[/i] [br]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. [/quote]    Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG) Check here to include your profile signature.