Solar Heating

[matt4x4]

It's easy enough to plumb in some kind of bypass or disconnect, you can either install a couple of diverter valves that will allow you to bypass the heaters, or do like I did and install a couple of quick disconnects so you can disconnect at either end of the panels, then join the hose from the pool to the hose returning to the pool and eliminating the panels completely.
There will be a time in the summer where you want to take the heaters off line primarily because of teh water temps, mine's been upwards of 95 before I installed the disconnects.

My reasoning for going with the disconnects over diverter valves was that with diverter valves, the panel portion, when bypassed, is a closed system, and with the heat from the sun could build up immense pressure from the remaining water being brought to a boil inside this closed system, the pressure could easily burst a panel, pipe or connection unless I installed another (3rd) valve that I could open to alleviate pressure buildup.

With the disconnects, the cost was reduced to about 1/4 of the valving setup, it switches over in about the same time (2 spin on/off unions) and provides me an open system that can vent so no pressure buildup will occur when disconnecting the panels.

Edit

My panels are permanently mounted to the ground on the south side of my pool, I drain them for the winter - it's a 10 minute winterization process. Removal and storage is a big pain -especially if you leave it too long and run out of sun - the panels get relatively stiff and don't roll up too tight taking up a ton of room, I have lots of storage so it's a non issues, but the removal and reistall process is probably upwards of 3 hours per year that I can spend more eficciently elsewhere.
The way I have them mounted is they're staked/tied using the strap cutouts on a slope on the south side of the pool, the ground prep was as simple as using the pool's supplied winter cover as a ground sheet to stop weeds, some 5" edging and the whole area around the panels is filled in with round pea gravel - I have this edging and pea gravel for 3 feet around my entire pool, as well, I encompassed the area where the posts for my solar blanked reel are mounted. This makes grass cutting around the pool with the riding mower an easy task without having to do any edging.
The winter cover provided me just enough material to cover the entire area I needed.
If you're wondering why I chopped up the winter cover, I see numerous pools every winter that have collapsed because of these things in combination with a leaky liner, high winds that billow the thing and thus tears at the pool structure or just other circumstance, I don't have many trees nearby (and if I did, I'd be using a leafnet instead) thus i don't get too much crud collecting, spring cleanup is usually relatively easy, just throw in bleach, the barracuda and a couple of backwashes and 3 days later I have sparkling clear water.

Sorry to go on this long!

[NWMNMom]

We have ours on a diverter system and if the water gets too warm, we run them on a timer at night to cool it down.

Ours are mounted on upright rack systems on the north side of our pool due to shade on the south side. The racks are pvc into concrete 50" high, then 48" at 45 degree angles. The whole system runs 35' along the north side. There are 3 uprights in front, 3 supports in back and pvc along the lengths w/connectors to connect top and bottom with chicken wire to hold the panels. Its all plumbed down the center of the system. It looks a lot like a pergolla and we actually use the back side to hang tools, hoses, etc. Its all drained for the winter (air blown out) but not removed. It has held up just fine and does a fantastic job of heating our pool.