...let's see now....oh that's right, ate lunch
.....and then discovered my solar
south was off. I felt one of the stakes sorta slide on an underground
rock back when I set it....today I checked it cause I had time while I worked on the debarking and the north plate. -that little slip made a huge difference.
So I lost two hours setting the south plate to true solar
I suggest using four pieces of rebar
and if stakes 2 and three hit a rock, dig that rock out and go straight down with your stake.
Any ways, I certainly am glad I took the time to correct the error. The badlands of New Mexico and Arizona are full of failed passive solar because someone didn't think
a little error would hurt that bad.
In my case, a 10 degree angle error would cost me 10% efficiency every minute of every hour for 6 hours per day for as many years as the building lasts.
How much is that? Well according to NREL, Montana gets about 410W per solar irradiance hour. 41W x 6hr =246Wh per day, so in one week, I've lost over 1.7kW.
In a year, 52weeks x1722Wh/week
89,544 Wh, or 89.5kWh in a year. Basically, in passive solar, a 10% error will @&$* you up....and you'll be cold and miserable.
If your passive solar isnt working, it is on you -sun is still there whether you catch it or not. End rant.
...guess I am a little testy having to fix my error in the heat of the day :]
anyways. North plate will hopefully see level tomorrow noon.