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tommyb avatar image
tommyb asked

Is there any way i can run a 1.5 Hp motor from my MultiPlus-II 12/3000/120-32 230V?

Hi All,


I'm just trying to size up a Cat pump for my watermaker and want to know what I can effectively run from my inverter.


I have 4 x 12v 200AH lifepo4 batteries with maximum 2540W output (according to the manufacturer).


The majority of motors I'm looking at have a start-up load of around 50A at 1750RPM, Before settling in at about 7A. I'm wondering if I can put a soft start in-line somewhere to bring the start-up load down to a workable range. If not, Is it possible to have a 2.2kva Suitcase generator hooked up to the inverter, allowing the inverter to pull power from the generator and battery bank for the start-up, then turn the generator off to allow my batteries to continue feeding the motor for a few hours to fill my tanks?


Any other suggestions would be much appreciated!


Thank you, Tom



inverter current draw
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2 Answers
Michelle Konzack avatar image
Michelle Konzack answered ·

Not a MultiPlus but a Phoenix Inverter 24/3000 and it worked with a 1500W Garden Chopper from Husquarna.

The Inverter housing make a short "bang" which comes probably from the extrem high magnetfiekd of the toridial transformer, but since the Phoenix/Multiplus have a nice overload capability, it should work.


If not, you will need a matchibg soft start electronic for your Motor

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tommyb avatar image
tommyb answered ·

Thank you for your response, Much appreciated!


I'll just buy the motor I think, Then throw a clamp on it to see what it comes back with for the start-up amps. I found out elsewhere that if all else fails, I CAN have a generator hooked up to the inverter, which will help with the initial start-up of the motor (up to 32A), then I can switch that off and let the batteries continue feeding the motor.


Thank you again for the response, Tom

2 comments
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nickdb avatar image nickdb ♦♦ commented ·

The generator is unlikely to respond fast enough for the surge current. I would not bet on that working.

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Kevin Windrem avatar image Kevin Windrem commented ·
Most multimeters are not fast enough to register the true peak current. For that you need an oscilloscope and a clamp-on current probe.
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