I currently have a solarc 15 inverter and a 1000ah lead acid 48 volt battery. My old system still has some life in it and I use the inverted power to power a 110ac/48v dc battery charger to move power from the old battery Bank onto the new one on rainy days. Is there a more efficient way of doing this? Is there a DC to DC charger of some sort to eliminate inverting the power back and forth. Or is what I'm doing a reasonable plan?