I am looking to be able to use US two-pole 240 to charge my house battery via autotransformer and multiplus 120/3000/24. In lieu of stacking two multiplus units, can I use autotransformer to accept the two pole 240 and transform it into single pole 240? I would then likley connect a traditional step down transformer in order to step down the single pole 240 to 120, which can then be fed into my Multiplus to charge the battery.