Insufficient flow problems with Autopilot and Solars

[matt4x4]

Hi Keith,
6lbs of pressure at the panels is really low, 10 is much better, I can see why your autopilot system won't work.
Now, I wonder if you could do the following:
When your autopilot system kicks in, have a relay activate to automatically switch your pump to high speed, once it deactivates, the relay should also deactivate and your pump should switch to low. This would involve a minimal amount of wiring and a maximum of 3 relays, and should be doable without any type of logic circuit involved, you would just have to find something on the autopilot to work as your remote trigger.

[Poconos]

Another option may be to divert part of the water to the panels instead of all. I'm assuming the autopilot is before the panels. Divert enough water to keep the autopilot happy. This would cut flow resistance after the autopilot and still give you some flow through the panels. Not optimum for the panels but should be good enough.
Al