My bad – they are Chamberlain openers, if it still matters.
From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf
Of Glenn Burt
Sent: Wednesday, January 31, 2018 12:48 PM
To: John ; re-wrenches@lists.re-wrenches.org
Subject: Re: [RE-wrenches] 12/24v garage door opener
I put a couple of a.c. powered garage door openers in my garage a couple of
years ago. They both had an onboard 12v battery as backup that allowed a few
operations when the grid was down. I used them for a couple of months that way
before I got power run out from the house. I charged them with a
I have measured the energy used by a garage door opener on more than one
occasion. they draw a fair amount of power while operating, however. they
don't draw power otherwise so the total energy is very low. I am wondering
if a low cost non pure sine inverter to AC operated off the switches which
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