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Are you saying I can get the advantage of MPPT without battery's and a charger. If so, can you explain. I understand the sizing on David Poz videos and like the simplicity but would like more efficiency of MPPT

Yes a LOT of energy, I figure once up to temp, a few hours of good sun a day would maintain it. But then that might be asking to much here in cloudy Oregon. Remember I am just playing, I always have the woodstove. I have thought of trying that except with multiple heating elements. 3 or 4 of...

I will try also... Open a 18'x8' garage door in a 30'x40' shop when it is 20* outside. By the time you move what ever and get the door closed again you have lost all your heat. With radiant the minute you close the door you are warm again.

Thanks for the replies, guys. I guess I should have said a little more about what I was trying to do. I have a shop/mancave at the house. Since I like to experiment I put pex in the slab and have tried a couple ways to heat the water so far. One of the things I have tried was I welded up an...

Yes, I set everything up (foam, pex and rebar) and have someone just pour the slab. 2.5" of foam. This is the 3rd place I have built for us with floor heat and would not put any other heat.

Thanks, was not familiar with those.

When you come up with the number from your formula, where is that measured from vertical or horizontal, which one is zero? Crude drawing? Thanks

Do you have a link, Thanks