solar Koi Pond

tikidog

I did this, One panel, a 51watt 3amp wired directly to a Rule 500 gallon pump 36 inch lift, Sun up to sun down it works great, well sort off-- after three months it dies, brushes all ate up. Low voltage did not bother it - it just did not pump very much, mid day it got warm but run vey well. Wally world question why my pumps keep failing. what pumps can I use that will vary the water flow according to sun output? between 500 and 1000 gallon per hour with lift of three feet or better