How do I connect my existing 3HP/3ph. Submersible pump to my Solar system.

[Rohinton Irani]

I have 4Kof solar Panels in two groups of 2K,CONECTED to TWO MPPT 48V/40A.Charge Controllers in Parallel.Two Sets of 48V/200Ahr Batteries.
At the moment all the above is conected to 3.5KVA Inverter.
What more is needed to run my Motor ,and how do I wire it .
I am talking 220 Volt system.

[sensij]

Fuses, motor starter, and lots of Sun. You might be able to get a couple hours of runtime midday from the panels, but keep it to less than an hour at night if you care about those batteries.

[Sunking]

You pray everyday, your batteries last another day. Unless you have a 3-phase Inverter, it will never work Even if you do have a 3-phase Inverter, doubt it will work at all because your batteries and Inverter are too small.

[DanKegel]

There might be some related earlier discussions on this board, e.g. https://www.solarpaneltalk.com/forum...220v-1-hp-pump
What model pump, and is it ok to run just during daylight?

[Mike90250]

Can you read the nameplate of the motor and see what it's KVA rating is ?
Your PV system could be rigged up to a VFD controller and maybe get the motor to spin, but you are nowhere near having enough power in the PV gear to allow the motor to do much work.

3 HP is about 12kVA = 9.4Kw

http://www.kc7hxc.us/links/calc/Power%20Calcs/3%20Phase%20Power%20Calc.html

[inetdog]

Can you read the nameplate of the motor and see what it's KVA rating is ?
Your PV system could be rigged up to a VFD controller and maybe get the motor to spin, but you are nowhere near having enough power in the PV gear to allow the motor to do much work.

3 HP is about 12kVA = 9.4Kw

http://www.kc7hxc.us/links/calc/Powe...er%20Calc.html

Actually Mike, what that site gave you was the kVA capacity required for a generator to start that size motor across the 60Hz line.
What is needed here, given that a VFD will be used, is closer to 3 x 746 x 1.1 (assuming 90% efficiency in the motor). So more like 2500W. Assuming that the motor is running at full rated load to drive the pump. By throttling down the pump output the OP can get even lower power as a trade off for pumping slower.

[Mike90250]

VFD's are not magic, they create a lot of EMI and back EMF, and often need special suppressors in their wires to protect the Grid. I used generator starting capacity, to insure there would be enough power to run the motor. When I do solar, I round up, generously. However 9Kw vs 2.5Kw is a big difference, and it is ALWAYS up to the end user to insure that the engineer that designs the system, is capable of the job. I suspect there is some middle ground where the required power is actually going to be, 4 or 5 Kw