Sometimes small systems are plenty

I recall from the store that had specs of small DC-DC converters, up to 10A, the efficiency was not too impressive, ranging from 60% to 80%. So by all means, get a small inverter, lose 10% and plug in all those AC-DC "rectifiers" bricks. It is just too complicated to convert each one to its own VDC - TV, cell phone, cordless drill etc etc.