APC Back-UPS for House Power ?

I am just throwing this out there as a Idea -

I have no clue if this would work or not -

Hopefully someone here knows more about APC and can
give some input on this idea--

End goal is to have Pure Sine Wave Inverter and AMG Battery
charger in One unit -sized correctly for van solar -

while researching for van electric parts I noticed that APC Backup
for office computer are very cheap - New -home/office -

found a used Very High Quality Enterprise APC for $30-craigslist

These APC provide Pure Sine Wave and many were +1800 watts/110 volt
and +2000 watts surge -most had 6 to 10 plugins -110v

High Quality - made to power electronics -
displays that are nice with specific battery details etc -

Also the APC has a Built in Battery Charger -

Charger is made to charge AMG batteries --Nice -

if the charger is powerful enough it could be sufficient
and Maybe be Perfect for solar on a van -

So maybe possible to get AMG battery charger and Pure sine wave inverter
in One unit ?????

Large Batteries mounted separately -

I have no clue if this is would work or not -

I have never touched a APC in person but I understand what they do-

Input into the APC is 110 volt AC -- Problem --

SO panel power needs to be converted to 110V AC at Some point -->
for APC operate - but possibly not - ?

Also noticed -

Some of the newer solar panels have a 110 volt Inverter built into
the back of the solar panel ---

So Panel power is 110v AC straight out of the panel and Smaller wire
is used -- Sweet --

Thoughts ?