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  • jazz02 commented on jtjaeger's instructable Solar/Grid Hybrid 12V System10 months ago
    Solar/Grid Hybrid 12V System

    For the battery to last long you have to charge it with C10 (Ahr/10) then the endpoint is 15.2v, if you charge with C20 (Ahr/20) the endpoint is 14.2v. The solar controller usually charge to 14.8v which is C15.if the solar panel,battery,charge controller,power supply not excactly match , the life span of the battery will be 2 years or less.Also the 12.0v max discharge depends on the current, by C10 12.0v = 50% but by C20 12v=30% left in the battery, this will not last long for the batterythe low voltage disconnect of the controller is usual 10.5v, then the battery is complete flat.A solution is adding an Arduino with an acs712 to measure the battery current,(up to 30A), 2 voltage dividers to measure battery voltage and solar panel voltage plus 2 relay(symplicity) or mosfets in the power...

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    For the battery to last long you have to charge it with C10 (Ahr/10) then the endpoint is 15.2v, if you charge with C20 (Ahr/20) the endpoint is 14.2v. The solar controller usually charge to 14.8v which is C15.if the solar panel,battery,charge controller,power supply not excactly match , the life span of the battery will be 2 years or less.Also the 12.0v max discharge depends on the current, by C10 12.0v = 50% but by C20 12v=30% left in the battery, this will not last long for the batterythe low voltage disconnect of the controller is usual 10.5v, then the battery is complete flat.A solution is adding an Arduino with an acs712 to measure the battery current,(up to 30A), 2 voltage dividers to measure battery voltage and solar panel voltage plus 2 relay(symplicity) or mosfets in the power from the solar panel and in the output of the power supply.Then the battery is always properly charged. when the solar voltage is high enough, the power supply will be powered off. the discharge current and battery voltage determine when the power supply will be on.less easy, but a battery life time of many years.

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  • jazz02 followed arduino channel 3 years ago
  • jazz02 commented on cnjack's instructable (solar power)+(raspberryPi Downloader)3 years ago
    (solar power)+(raspberryPi Downloader)

    Please change the orientation of your solar panel to horizontal or 45'the vertical position is the worst possible, you will receive up to 60 watt from your 90wp panel,Also important NO SHADOW or partly shadow on your panelthe results will improve, let me know your progress

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