I'm having trouble with my first time set up. I have a Coleman 120w panel, going to a 8.5a controller, to a 12v deep cycle marine battery. I'm using a 2000w inverter, and trying run an RV fridge off it. The fridge says it's 440w which seems high for such a small fridge, but even when running on gas, each time it tries to kick in I get a low voltage squeal from my inverter. Is this system to underpowered for the fridge? Plugging in my 150w laptop will also cause a low voltage warning in a matter of minutes.