powmr 6500w 230v inverter 2 wire L&N&G for USA?

Some 220/240 VAC appliances in North America will run just on two Hots (no neutral). Should work OK with those units.20 

On units that require 120/240 VAC, in theory, you could run the 240 Side with 240 VAC, and use your 240 VAC transformer to step down and run the 120 VAC side--And if Neutral bonding required, just neutral bond the 120 VAC leg (probably the "floating" 120 VAC leg, not the leg connected to 240 VAC hot).

HOWEVER, while I have done some pretty "different" wiring schemes for 120/240 VAC / 3 phase mills and lathes, I had full schematics for them and could trace out the wiring and (for some) require them internally to "separate" the 120/240/single phase/3 phase connections).

I would be hard pressed to do this with any new equipment that I did not have any manuals for. The chances that something could go wrong, or the unit simply not work--I would not recommend doing this.

HOWEVER, if you had some equipment that you did not care about (a used AC system, etc.) and wanted to risk it--It may work. Older equipment with less internal safeguards may be a more reliable conversion.

In the end, there is no "one right" answer for this inverter+transformer. There will be "risk" (from damage to fire/shock hazard), and it would not be something to try without good knowledge of what you are attempting.

The other downside, transformers do take power, even if they have zero load... You could be getting a 5% (of transformer rated capacity) as losses... With solar, we try to avoid losses as they require more panels (and more batteries) to run the "extra" transformer.

And there are questions about the inverter... The manual for your inverter?

https://cdn.shopify.com/s/files/1/0746/0415/1079/files/POW-HVM4.5K-24V_6.5K-48V_User_Manual_V1.2.0601.pdf?v=1717209326

It does list H/N 220 VAC connections. In North America, we assume that H1/N/H2 connections have the N "ground Bonded" somewhere (typically in the main service panel).

Some AC inverters just pass thru the N connections, others will actually switch a ground bond to the N (for example) RV usage where sometimes the system is running from "shore power" (N+G bond in shore power panel), and other times open the G+N bonding when running off grid.

Given that 220 VAC single wire systems usually ground bond one of the leads--This is different vs 120/240 VAC split phase north American power where H1 and H2 are just 120 VAC with respect to ground/Neutral--How this would affect the Powmr inverter--I have know idea.

-Bill