I have been told my 2009 Model is not compatible with the new Lithium battery's I just bought.... After tossing around different paths to go........ why cant I just use the invertor side and just not use the charging side? Couldn't I buy a compatible charger to use without buying all new? I am working with their Magnum controller and using three 12v lifepo4 battery's and 2/3 100W panels. Thanks for any help.