They may not say that it is a full voltage scheme. But you can ask that question. Or ask if it is NEC (national electric code) approved. Half voltage schemes are not NEC approved. Almost any full sine wave inverter will be full voltage.
Another thing you can ask about or look for in the US is the UL approval. If it is UL458, it is definately a half voltage inverter.
Don't even consider trying to get a 220V half voltage scheme and wire it up.
