Quote Originally Posted by mas985 View Post
Most controllers will take care of this by running at high speed for a few minutes and the downshifting to low speed for the remander of the cycle.
The Ikeric has a flow switch that governs when it goes into high speed mode (it doesn't use relays but a separate computerized motor controller of some sort). I'm not sure if it can be programmed to throttle back after a delay. I am using the Gold Line GL135 solar controller, which is a really simple unit. I'm not sure yet if I'm going to use the Ikeric flow switch or the 220V relay built into the GL135, I have to talk to the Ikeric guys.

I'm not really sure I want it to do that anyway, right now I have 8 panels (4x14) and am probably going to add more. The 8 can handle (max) 80GPM, more likely about 65GPM. If I add another bank of 5 (or even 8 maybe!!), I would need to pump somewhere between 65 to 100GPM through the panels (5 to 8GPM per panel), so that is going to take "high speed", even with 2" lines. The nice thing about the Ikeric is that "high speed" is adjustable, so I can dial it in to get exactly the flow I want and no more.