Solar Panel Install w/pcs Part 2 (dial-up beware)

[MaxxFusion]

What size is your pump? How well do the panels work on the second story of your roof? I have some panels and want to mount them to the roof but only have a second story area.

[pj1016]

I took the opportunity to throw-out my 20 year old 2 hp pump and installed a 3/4 hp Hayward Northstar. I probably could have gotten away with a 1/2 hp Northstar and saved even more $$ on monthly operating costs.

I'm not sure what you mean by your second question - the panels get full exposure being on the second story, so it is an optimal installation.

pj

[MaxxFusion]

I thought mounting the panel on the second story roof was too high.

[pj1016]

Too high? Closer to the sun!

The only problem with height (aside from having to work on the second story whilst being affected with acrophobia) is the pump head issue. Is that your concern?

If so, you are certainly correct - it is very important that this issue is addressed. More broadly, the pressures throughout the system must be calculated during the design phase - *not* later.

As far as the roof height is concerned, your pump needs to be able to lift water to the very top of the panels (i.e., the highest point which is the outlet). My outlet is at 25', which is about 11 psi...easily handled by my pump (this is exactly why I say I probably could have downsized the pump even further to 1/2 hp).

The next crucial issue to address is this: you need to tie-in the solar panel outlet into a spot in your return system that is at a *lower* pressure than the pressure generated by the head of your solar panel outlet. The larger your pump, the harder it will be to find this spot. Unless, of course, you have a completely separate return pipe that you can dedicate to the solar.

This is the reason that I strongly encourage anyone who is contemplating this project to examine the webpage on www.powermat.com that addresses mechanical and plumbing design. It clearly explains the issues (with diagrams) that I have only touched upon.

HTH,

pj

[coryinsocal]

Too high? Closer to the sun!

The only problem with height (aside from having to work on the second story whilst being affected with acrophobia) is the pump head issue. Is that your concern?

If so, you are certainly correct - it is very important that this issue is addressed. More broadly, the pressures throughout the system must be calculated during the design phase - *not* later.

pj

why would the height add to the head? it has to come back down... adding to the equal and opposite head? no?

[RocKKer]

coreyinsocal - I'm not pj1016 but:

Your right once the system is filled with water less head is needed to keep it moving. But usually there is a vacuum break valve high in the system so the water drains back into the pool when the system is off (for winter freeze protection). So you need a pump that has enough head to pump all that water up to and over the top everytime it starts.

[CarlD]

How many square feet of panels do you have???

I have 640 square feet of pool and heat them VERY nicely with 240 square feet of panels. During the heat wave my son forgot to turn them off and the water hit 98 degrees!

Why do you need so much? Are you in Northern Alaska and looking to extend your swimming season beyond the 4th of July?