Hi, I’ve got several quotes, but wanting some feedback on what would be recommended from following specs. We average 11kW usage a day, but young family with expected increase in consumption. We’re two storey, tin roof, NW facing 7 deg pitch roof with no shade at any time of year. We have a three phase meter, and have been told that we can feed back up to 10kW to the grid. THe final quote include options to increase in size quite a bit. The numbers seem to add up that the extra expense will be offset, but would appreciate feedback if it’s overkill. Finance for us would only be our mortgage rate of 3.8%.
Quote 1 - 6.3kW system using Enphase IQ7+ Microinverter, 20x TRINA 315W panels, Hopergy Tin ROof Racking system. 10yr warranty on inverter and workmanship, 25yr panel performance warranty, $7,999.
Quote 2 - 6.6kW system using 5kW Solar Edge Inverter - 12yr warranty, 22x Suntech HyPro STP 300’s - 12yr warranty, 22x Solar Edge DC OPtimisers - 25yr warranty, Clenergy Mounting System - 10yr warranty, Install warranty 10yr, $6,190
Can also upgrade to 7.8kW system with 6kW Solar Edge Inverter and 4 additional panels and Optimisers for a total of $6,990.
Quote 3 - 6.6kW System using 22x Longi MONO PERC 300W panels - 10yr warranty, 5kW SolaX Hybrid INverter - 10yr warranty, $8,245.
Can also upgrade to a 9kW system with 30 of these panels and an additional 5kW SolaX Boost Inverter for total cost of $11,345
Or finally a upgrade to a 12kW system with 40 of these panel and the same inverters as the 9kW quote for a total of $14,845. Note, that some of the panels on the 12kW system would get some winter shading.
Appreciate any feedback I can get that will simplify my confusion and inability to easily compare these!