I've installed two kits on homemade houseboats. Installing was straight forward and pretty much everything you need is included. Not sure of loads or anything but I can have the radio cranking and lights on (all 12v and led) for hours and hours and barely make a dent in the batteries. 2.5 years on the first and 2 years on the second, still going strong.
After purchase of this solar kit it takes a bit of time to recharge the four 100ah batteries and I am only using this to power a furnace in a Rv, After charging the batteries fully the batteries only lasted 12 hours well I would of thought that only running a 6.5 amp furnace on a 4-400ah batteries would of done better not impressed at all