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Hook up I have a 6 sqf-3 well pump and a grundfos sqf-cu200 controller Have been running well with generator, and finally got my solar panels up. Problem: Hooked up 4 12 volt 120 watt each panels in a 48 volt configuration, pump rums at about .42kw. Hooked up 4 more panels, 48 volt configuration,and tied the 2 together in parallel , and the pump tries to start, and quits. Pump will run with either bank of panels, but not both of them at same time. I then hooked all 8 panels in a 96 volt configuration, pump runs great. Checked everything multiple times, cannot figure why it won't run at 48 v0lts, 2 banks of panels tied together.

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Posted on Jan 02, 2017

  • 512 Answers

SOURCE: Grundfos MQ pump starts every 15 seconds

Pressure is bleeding back through the pump or system to the tank or well or where ever the water is coming from. Should be some sort of one way valve to keep water from going back to the source, mounted somewhere so that once pressure is pumped up, it will hold that pressure in the part of the system that has the pressure switch that controls the pump.

That or you have a leak where you can't see it. (Actually you do, it is just internal and not leaking outside the pipes!)

Posted on Nov 05, 2012

jonsnell4
  • 20000 Answers

SOURCE: WHY DOES MY BOILER PUMP RUN CONSTANTLY

Check the thermostat.

Posted on Aug 02, 2014

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I have a 3000 watt inverter,with 3 plug in outlet..how much power do I get from 1 outlet..this equipment is hook to 6 12 volt battery charge by a 60amp controller and 3 solar panel of 265watt each???


You didn't mention what make or model of inverter. Lets assume you are in the USA and your inverter has standard the US 15 Amp three pin 125V NEMA 5-15 AC outlets. based simply on that you would have a max of 125 x 15 = 1875 watts per outlet.

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Where can I get repair parts for a Grundfos CU 200 solar controller?


Sorry we have no parts resources other than what you can find on the web.

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Grundfos pump problems


There are several possibilities here. All involve water pressure. The first is that you have a water leak between the pump and where the water is going to.
The second is that the pump is not getting enough water to it so it is sucking air well as water in an attempt to give you water perssure. This could be caused by not having an inline "one way" valve on your supply line just before the pump ($30.00).
The third involves two little screws on the control where your electical connection is. These two screws control the high and low pressure settings of your pump. If your high setting is too high the pump will simply keep running trying to do the impossible, If there is not enough difference between the high and low setting the pump will also keep on. running.
Another possibility is that the pump has had debris (sand, dirt, mud, etc) sucked through it and has damaged either the housing or more likely the impeller that spins the water creating the pressure.Ther is also an internal seal that can be damaged by debris.
The final possibility is that the pressure control unit with the two little screws I mentioned earlier has failed and is deffective.

Most importantly if the pump is running hot please stop using it! You are at risk of fire and possibly the loss of your home and loved ones. Grundfos pumps can be serviced by a professional technician, Parts are readily available and not extremely expensive. I would not recommend doing it youself if it is the pump.as some specialty tools may be involved depending on the problem. You will become frustrated very quickly.
A fast solution is to buy one of the cheap plastic pumps ($169.00) made in China. They are amazing for the price and will run with no problems for years if your water is free of debris. Fixing your Grundfos may run you the same amount and you maybe without a pump for a week or more depending on the technicians work load.
I am not saying "Don't fix your Grundfos" but you don't need to be in a panic about it either.

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I have a Hayward Power-Flo LX SP1515-Z2-EBK3 that is being used to pump water through 2-4x8 solar water heater panels. The pump intake is 1 1/2 inch, discharge out is also 1 1/2 inch. The pump is located...


I have a 3/4 hp hayward pumping thru solar panels, too. 1-1/2 discharge thru 50 ft of 2inch pipe, up 12 ft then thru (4) 4x12 panels. Mine is on 115 volts ac.
You have plenty of pump and when you run a pump with low flow, amperage is low. You are not tripping your breakers, it sounds like the pump is overheating. Is it hot to the touch when it shuts down?
Do you have an ammeter so you could check your amps?
What size wire is running the 60 ft to the pump?

I don't have any other ideas to share.

Gary

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