I saw more than one GDO with built in battery backup and am keeping that thought in mind. I did go into my attached garage with a ladder and Kill-A-Watt meter and found that my garage door opener uses up to 526 watts to open the 9'w door {minus 8 watts if I remove the CFL} and up to 501 watts to close it {minus 8w less CFL}.
I already have a 500 watt inverter, it surges to 1000 watts, so I am thinking I need to verify that it will open and close the 9'w door from a 12v battery. Of course this door is 9'w and the garage / workshop door is 12' wide, but I think the spring tension could be adjusted to even the score if the 12'w door is too "heavy."
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