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Of course it is, because they sell such things. But
schematics, I have none.
What I would recommend, is a scheme where the
powertrain is modular / parallel with some reasonable
inherent current-sharing. If (say) you stuck to a 1kW
unit power stage, you'd have something that could
comfortably run off a single lead acid battery (with
sensible wiring sizes, continuous amperage in the
battery and so on). Then if the outputs were "gangable"
you would deliver the output voltage at lower current
(less copper, maybe standard house wiring) and not
have to deal with the 400A input problem on one
very fat cable.
You can see such inverters advertised for solar energy
applications, sometimes with charge management as
well. You might want to search by specific model and
maker "tags", for your schematics or reverse-engineering
info.
Even if you do not succeed in this, if you want to go
to high wattage , using powertrains paralleled at the
gate and the transformer output can distribute the heat
a lot more nicely than a single heavyweight. And your
rating becomes a matter of simple addition and many
cheap components, rather than the top end and high
power density (hence difficult thermal management).
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