I have a MPPT 75/15 charge controller charging a 1 x 150AH gel battery from 2 x 100w 18v 5.5amp panels (in parralel). Connected to the battery is a Victron Blue solar 12/1200 inverter. I was wondering if I could add a second 150Ah gel battery to create a 12v 300Ah battery. I'm new to all this, so was wondering if the charger could handle charging double what it is doing now? Currently the load on the inverter is around 300W, but I want to add my fridge (260w) and need the system to run for around 4 hours during loadshedding.