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pinballlooking · 08-02-16, 12:14 PM

I think PVWatts is close enough for what it does. I am performing a little better than the estimate 105% for the lifetime of the system.
That is close enough for me in looking at what you want to install. But others want in to be more accurate. Year to year it is different so you are looking for a great guess based over many years of data.

Here is actual posted data for my system
Flynns Arcade 12.560kW
This data gets posted directly from Enphase.

I find this graph interesting.

08-02-16, 12:14 PM	#544
pinballlooking Super Moderator Join Date: Jun 2013 Location: SC Posts: 2,923 Thanks: 172 Thanked 564 Times in 463 Posts	I think PVWatts is close enough for what it does. I am performing a little better than the estimate 105% for the lifetime of the system. That is close enough for me in looking at what you want to install. But others want in to be more accurate. Year to year it is different so you are looking for a great guess based over many years of data. Here is actual posted data for my system Flynns Arcade 12.560kW This data gets posted directly from Enphase. I find this graph interesting. Attached Images __________________ Current project Aquaponics system , Passive Solar Greenhouse build To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. Solar Install 12.5 Kwh- To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. Mini Split installs - To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. EV Chevy Volt - To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.