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Battery voltage monitor




This voltage monitor has been designed to remotely display battery voltage so that people monitor and maintain their batteries easily. It was designed for use on off-grid reneable energy systems (such as my solar PV system), but it would also be useful to anyone who has a lead-acid battery, such as caravans, boats and cars.

Battery voltage monitor
It is designed to plug in to a car ‘cigar lighter’ socket and display the voltage on a remote LED display. Here are the plans to make your own.

Parts required

  • 3mm plywood sheet (around 1/3 sheet of A4)
  • Wood glue
  • 2 x M3 machine screws (around 12mm long)
  • 2 x M3 nuts
  • 4-digit LED display
    • I used this one from SunTekStore (but available at other places including eBay):
    • http://www.suntekstore.co.uk/product-14002344-036inch_4_digit_digital_panel_voltmeter_0-33v_red_led_voltmeter.html
  • On/off switch
    • I used this one from SunTekStore (but any switch would work):
    • http://www.suntekstore.co.uk/product-14001517-black_mini_size_spdt_slide_switch.html
  • 2m of twin (red/black) cable
  • ‘Cigar ligher’ type plug

 

For more detail: Battery voltage monitor

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