This little guy looks like it might do the trick http://www.ebay.com/itm/10-50V-40A-DC-Motor-Speed-Control-PWM-HHO-RC-Controller-12V-24V-48V-2000W-MAX-1-/281148521177?_trksid=p2054897.l4275

The RPM of a 12 volt roof cleaning pump motor is a function of voltage. Increase or decrease the voltage, and guess what happens ?

More, or less flow/pressure ! 

Theoretically, it should be possible, by using a variable resistance device like this, to use nearly any size nozzle on say a 12 volt Delavan Fat Boy Roof Cleaning Pump, then simply slow the pump down enough, so that it stops cycling on and off so much.

This will hurt accumulator sales, of course 

I never liked accumulators anyway, just another possible leak source, because of additional connections.

The FEWER connections you have in a SH Deiivery system for cleaning roofs, the better! 

hickeys45 wrote:

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Chris I got a controller made up for my pentaflex pump. It did work but not great. I now use it on a shurflo 12v pump. It controls the flow but not the pressure. I can turn it down but the pressure remains the same. I contacted the manufacturers of the controllers used by window cleaners for their waterfed pole systems ( these can control the flow, pressure and give voltage readings, some can turn on heaters when the temperature drops below a set point, some have remote controls etc etc )and they told me that it would be more complicated to make up a controller for the bigger pumps. They weren't interested in making one for the roof cleaning market.

I am going to see if I can set up a remote control on the pentaflex to turn it on and off from the roof, saving the battery and pump. At the moment I have a bypass back to the tank to stop the pump cycling

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Doesn't your Pentaflex have a pressure switch?  If so, no by-pass should be needed as the pump should be on-demand.  I've used the 12v remotes  for an emergency shut down, and they didn't hold up well to SH exposure.  Perhaps you'll have better luck!

Roof Cleaning Northern Virginia (571) 250 9650 wrote:

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Apple Roof Cleaning Tampa FL (813) 655-8777 wrote:

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hickeys45 wrote:

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Chris I got a controller made up for my pentaflex pump. It did work but not great. I now use it on a shurflo 12v pump. It controls the flow but not the pressure. I can turn it down but the pressure remains the same. I contacted the manufacturers of the controllers used by window cleaners for their waterfed pole systems ( these can control the flow, pressure and give voltage readings, some can turn on heaters when the temperature drops below a set point, some have remote controls etc etc )and they told me that it would be more complicated to make up a controller for the bigger pumps. They weren't interested in making one for the roof cleaning market.

I am going to see if I can set up a remote control on the pentaflex to turn it on and off from the roof, saving the battery and pump. At the moment I have a bypass back to the tank to stop the pump cycling

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 Be careful, with a bypass, on a 12 volt pump.

Pay attention to the Duty Cycle of the pump, and if possible, take temperature readings of the pump as it runs.

It is far too easy to exceed both the duty cycle and the max temperature the motor can take, by running a 12 volt pump constantly, as you would in any bypass situation.

Heat Sinks can be added to 12 volt pumps, as well as cooling fans, to help a bit with the Duty Cycle.

I wonder why the pressure was not controlled by the voltage reduction ?

Hey, check this out http://www.solar-electric.com/flje2pjho85g.html

LOL, is this the accumulator from Hell 

 

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 Because the pressure switch is literally just that, a mechanical switch that is closed until the predetermine line pressure is reached at which time it's 'open'.  It's not electrically operated.

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 That is correct. I assumed he tried to adjust the pressure switch/screw when he reduced the voltage.