We just purchased a house with what we believe is a Harman SF-160 (or that same series). It looks like it does have the electric backup, but we cannot find any info on it anywhere. The previous owners claimed to have never used the backup, and I think they actually disconnected it. Please see the pics of what we are working with. We need to have backup for when we are on vacation/gone for a long weekend. All advice welcome!
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