Using Resun CL650.
When my 2x150Watt kicks in, i find that it take abt 1 hours to chill to 26C, rest for 2 hours or so and start kick in again for an hours or so. Using Extrema to power the chiller
Tank is 4x2x2 with 2.5 x 1.5 x1.5 feet sump tank. Return is ehiem 1262, 1x aquabee pump for my skimmer and 1x 6060 wave maker. So far satisfied with the chiller.