It's out of a UPS, so I think the white/black at tp of picture was the output - 2 wires, through a rectifier to the batteries. Not certain, but seemed most likely. Otherwise where would all those wires at the bottom go in what's essentially a giant charger? But I'm a moron with electronics, so there's that as well.Are you sure about which is the primary and which is the secondary? Looks to me like you have it backwards.
Why do you think the wire resistance is meaningful?
They are joined together - so both whites are crimped into the same eye connector, and both blacks are crimped in a single eye connecter. No way to feed the sets separately.The top 4 conductors appear to be the typical dual primary, parallel or series, e.g. 120v 240v
Parallel version shown.
We're nominally 230v here in New Zealand... but as I said it's pretty wobbly delivery so it's always up and down *around* 230v.Hmm... I'd measure the V from each to ground but sure suggests the 10GA is the secondary going to a rectifier. Definitely odd to me. And this out of a UPS? Do you have 120VAC or 240VAC supply where you live?
As a UPS output transformer I suspect it was used similar to this type of Modified Sinewave configuration.Still hoping someone can explain the wiring on this to me.
Happy to perform suggested tests as long as I have adequate equipment.
Testing SamR's above idea-
Feeding 230v Mains to wire 1 and wire 10 gives:
27v on the primary-side blue/yellow pairs
27v on the secondary-side white/black
So seems he was right there.
So seems those 27v outputs gets turned into ~24v through some rectifiers, the 14AWG one on the device side and the big 10AWG output goes out to the batteries?
But what is up with the jumpers between transformers?
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by Jake Hertz
by Jake Hertz