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Old March 9th, 2016, 08:30 PM
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Default Sizing a generator to run RO unit

What size of generator do I need to run a RO unit that has 3/4 HP motor for high pressure pump and a 1/2 HP shallow well pump? This is a home built unit and I am off the grid. I am hoping my Honda 5000 Watt will run it but maybe you guys can give me me a heads up.
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Old March 9th, 2016, 08:50 PM
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The 3/4 HP motor should use 3/4 of 746 watts, but figure the surge at as much as 3x that. The 1/2 HP well pump should use half of 746 watts, again up to 3x that for a surge. As such your 5000 watt genny should be OK, .75x746 + .5 x 746 = 1305.5 watts x surge (3x) = 1305.5x3 is still under 4000 watts. A 5000 watt genny should handle a surge of at least 10-15% more too. Just don't try to run too much else when you start the RO, but then other small things, like a light or 2 is fine.
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Old March 9th, 2016, 09:06 PM
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Yeah that is good news. I have solar panels and battery for lights and radio ;)
I am just getting started tapping here in quebec. hope not too late but 2 ft of snow in bush yet but next week looks sweet!
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Originally Posted by Maple Flats View Post
The 3/4 HP motor should use 3/4 of 746 watts, but figure the surge at as much as 3x that. The 1/2 HP well pump should use half of 746 watts, again up to 3x that for a surge. As such your 5000 watt genny should be OK, .75x746 + .5 x 746 = 1305.5 watts x surge (3x) = 1305.5x3 is still under 4000 watts. A 5000 watt genny should handle a surge of at least 10-15% more too. Just don't try to run too much else when you start the RO, but then other small things, like a light or 2 is fine.
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Old March 10th, 2016, 08:13 AM
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Amps the motors uses X Volts required will determine the watts needed to run equipment. Say 20 amps@230v is 4600w and add some extra watts (25% min ) to Generators capacity for start up.
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Old March 10th, 2016, 11:40 AM
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Default 1750 rpm or 3400 rpm motor speed for procon pump

Next question;
Can I use a higher speed rpm motor ? my 3/4 hp 1750 motor just blew and I have a higher speed motor at 3400. wonder if that is doable??
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Old March 10th, 2016, 11:54 AM
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Quote:
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Next question;
Can I use a higher speed rpm motor ? my 3/4 hp 1750 motor just blew and I have a higher speed motor at 3400. wonder if that is doable??
I would suggest you do not use a higher RPM motor. If you have the Procon type pump, they are only rated for 1750 RPM motors.
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Old March 11th, 2016, 08:41 PM
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Quote:
Originally Posted by Kevin Sargent View Post
Amps the motors uses X Volts required will determine the watts needed to run equipment. Say 20 amps@230v is 4600w and add some extra watts (25% min ) to Generators capacity for start up.
Kevin's right, except you need to actually put a meter on it, you can not use the plate rating on the tag. A motor that says it needs a 20A fuse is not using 20A, that means it should not exceed 20A even on the surge at start up. To read amps you need a amp gauge, it must circle just the hot wire to get a reading. You could also use a Kill-a-Watt meter if the motor doesn't exceed 15A.
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Old April 17th, 2016, 07:10 AM
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Default My generator did the job with no problem

I know the answer now as my generator worked great. In fact I could probably have doubled the amount of load on it as it just went ticketyboo the whole time. Thanks for the input all :)
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Old April 17th, 2016, 09:24 AM
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Over speeding liquid pumps will cause Cavitation and that can damage pumps.
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