I for one, would be very interested in learning how to build what tytower is asking about.
Perhaps he could start a thread with all pertinent information and photos.
I have 2 older 1500kva UPS's at 24V and would like to build a 24V battery to 120V ac unit to start.
I'm hoping to use the xformers from both units and rewind them as one, if this will work out. I looked up the 8010 boards and sometimes they come with a 2002 board for $15.00 all in free shipping. Can't believe that is all the electronics needed to make a decent inverter.
I have one of these boards (well, not exactly this one because i bought it several months ago)
the price i see right now is $4.74 and $1.85 shippingwww.ebay.com/itm/Pure-Sine-Wave-Inverter-SPWM-Board-EGS002-EG8010-IR2110-Driver-Module-/331748857232
Harold, its likely that your older UPS has totem pole mosfet drivers. a 2n2222 and 2n2907 transistor with a 2n7000 to drive them.
The newer ones have a surface mount 16 pin H bridge driver, and i can't remember the part number.
Basically all you need to do is preserve the h bridge driver and cut the H bridge off the board. Add a second capacitor to the board because the ESR of the old one increases with age.
That egs002 drive board already has the IR2110 driver and it supposedly can deliver a peak current of 2 amps into the fets. this is good, but the problem is the inductance between the ir2110 drive board and the H bridge. it would be better to install the gate driver as close as possible to the h bridge.
there are some other details i will look into before speculating on the best way to handle the output voltage and current sensing.
I would not rewind those transformers, they aren't welded, but i've always experienced significantly higher eddy current losses whenever i take a core apart and put it back together, and i can't fit all the sheets into the original bobbin the second time anyway.