Solar water pump selection

[Mike90250]

correct me if i am wrong:

DC (brush less ) pump (submersible) maximum range around 10 HP

which better for solar DC pump 10HP or AC pump 10HP and what the difference pleasse ?

Thanks mike;

We are not pump salesmen, and I don't know what the max DC HP is. 40 years ago, I used a variable speed, 50hp DC motor to drive a 400Hz aircraft generator. So I know that if you have the $$, they can make a motor for it.

For Solar, a DC pump saves the trouble of buying a 3 phase inverter and battery bank. The DC motor likely has it's own special power conditioner to run it.

[Eng_Ragy]

hello ....

[Eng_Ragy]

You are going to need to hire a local expert to design this. We can say "yes, that sounds about right" or "No, that salesman is a fool, trying to steal your money for something that has no chance of working." But we can't do a $5,000 engineering job for you over a forum.

correct me if i am wrong:

DC (brush less ) pump (submersible) maximum range around 10 HP

which better for solar DC pump 10HP or AC pump 10HP and what the difference pleasse ?

Thanks mike;

[Mike90250]

You are going to need to hire a local expert to design this. We can say "yes, that sounds about right" or "No, that salesman is a fool, trying to steal your money for something that has no chance of working." But we can't do a $5,000 engineering job for you over a forum.

[Eng_Ragy]

I don't know of any reports of any off grid, 3 phase systems being successfully implemented.

Which pump are your using 7KW or 9KW or Both at the same time ? That's a lot of power.

I assume you are using this for irrigation. Any chance the pump salesman sold you a much larger pump than you really need? Solar is about conserving energy, so there are not a lot of high power choices.

The inverters will be expensive, about $7,000 each, and you would need 3 of them, some sort of control box and a huge battery bank.

The PV panels will need to also be an extensive array, somewhere between 15-20 KW of installed panels (for a 10KW motor), many charge controllers, and lots of structure to hold it all together, this is a very large project.

Thanks for reply and yes you are right this for irrigation and i use 7KW for farm (35 acres) and the 9 KW for another farm ( 50 acres) and each one have generator but i was asking is solar system off-grid more efficient than diesel generator

and the price of each system will go a round 50K to 60K usd ?


and what about DC pump is it can handle same amount of m3/h as AC pump,

If i need to run this system only during sun peak, do i need a lot of battery bank ?

Thanks;

[Mike90250]

I don't know of any reports of any off grid, 3 phase systems being successfully implemented.

Which pump are your using 7KW or 9KW or Both at the same time ? That's a lot of power.

I assume you are using this for irrigation. Any chance the pump salesman sold you a much larger pump than you really need? Solar is about conserving energy, so there are not a lot of high power choices.

The inverters will be expensive, about $7,000 each, and you would need 3 of them, some sort of control box and a huge battery bank.

The PV panels will need to also be an extensive array, somewhere between 15-20 KW of installed panels (for a 10KW motor), many charge controllers, and lots of structure to hold it all together, this is a very large project.

[Eng_Ragy]

hello;

pump.jpg

I currently using diesel generator to run the attached pump specification 7.2 and 9.2 KW and i would ask is it possible to run it with off-gird system ?


1- There no way to get gird to this place that's why i said off-gird system
2- I know it will be costly because using 3-phase inverter . will it reach more than 100K USD for one pump?
3- can i replace this pump with DC pump with same specification but as i know and correct me please if i am wrong the maximum DC pump is 1 or 2 HP
4- If i need to run this system only during sun peak, do i need a lot of battery bank ?
5-The performance of the pump will be the same if i used off-gird system compared with generator.


P.S: I hope you guys can understand my questions and sorry for poor English

Thanks;