Wednesday, July 1, 2009

12V Power Source Auto Switcher

I am looking to build a box that automatically switches over the power source from an AC Supplied 12VDC power supply... To my 12V Solar backup battery. The Box would act like a UPS, in that it would normally be supplying voltage from a 12V wall plug, and automatically switch to my Backup Power Source in the event of a power outage.

I am thinking Diodes, (for power isolation) Capacitor, (For Buffering the power during the source switch) Relay to switch... Etc. Any suggestions would be welcomed.
I have a schematic in my head, and I'll post my thoughts as I brainstorm more.

I want a low current Relay that will swap over to the other source when the power goes out.
12V powered, and capable of handling 5A or so max.

1 comment:

  1. I have been searching for some details for this exact situation. Did this work out for you? I have a datalogger in the field that runs on AC but has a rechargable battery that serves as a backup. I want to have the battery recharged via solar panel in the event that AC is lost.