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what i want to do is stack 2 or 3 (and if it works maybe more) ups units with parallel outputs to gain more capacity.
now i realize this cannot be done by simply connecting them because they are not sync'd to one another
so my question is this
say i hack into the logic drive of inverter #1, then disconnect the logic drive from inverter #2 and use the logic from inverter 1 to drive both inverter one and two.
that way all inverters are in sync with one another, and if all inverters are matched units the outputs from the transformers should be able to be connected in parallel.
also i realize that i would need a switching relay setup to disconnect the slave units before shutting down the logic drive to the slaves, otherwise power would be back fed and smoke is likely in the final drive of a slave inverter.
the goal is to have one(#1) inverter running and have a microcontroller control the addition of more inverters online in a stepped fashion as the load requirement increases.
much like how exeltech does their system, as does apc symmetric series of ups's
it just seems like a worthy project to save tons of ups units from the scrap pile just because they have dead batteries.
wow. nobody ever tried this, thought about trying it, or heard of anyone trying to do this?
it has taken a few hours of thought and a couple hours to reverse engineer the pcb to find how the logic drive injects into the fet drivers, which are made up of pn2222 and pn 2907a transistors,
trying to work up the never to disconnect the logic drive from one inverter and jumber the logic from the other inverter to enable both to be controlled and sync'd by one logic drive.
i am into this for 15 bucks, and a few hours of thinking and tracing
i guess that is not to bad of an investment if it fails. hopefully it works, that would be useful and cool.
if it fails i hope it does so spectacularly, no sense in just a little smoke if it goes up in flames it should at least be entertaining shouldn't it?
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stacking ups inverters ??
