ok well can a power supply be build inside the inverter that would give you 12 or 48 volts and a nice high am which would keep the load off the batteries. with this the life time of the batteries would be much longer. the inverter would pull from the power supply instead of the batteries and i have this software that calculate the specs for you i put in what i want and it told me how much volts and size capacitors i needed well if you want it let me know and check it out and see whats use it could be