Recommendation on water pumping system

[SunEagle]

Why not just buy a diesel pump to pump that water, that would be cheaper yet and more efficient.

Correct. That is what I have been trying to explain. Using solar to run a large 3 phase horsepower motor is insane when there are other options which cost less.

[russ]

Why not just buy a diesel pump to pump that water, that would be cheaper yet and more efficient.

Dumb plus a solar salesman with no knowledge.

[Johann]

But how does a 30kw inverter "start" a 40hp pump? It can't.

Also by the time the OP purchases the 39kw of panels and 3 phase inverter he would be spending over $100,000. He could have installed a diesel gen set and very large fuel tank to get his water and saved $70,000.

Why not just buy a diesel pump to pump that water, that would be cheaper yet and more efficient.

[SunEagle]

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30kw inverter can run the 40hp pump ,pls note it is 40HP ,not 40kw , inverter can >= pump power , it have been install in project ,work good , of coz ,you can install bigger inverter ,serive life can be longer

as i know , the 39kw pump and inverter the spend is about $20000-26000

No fuel cost,it is economic

39kw of panels even at $0.70/watt comes to $27300 by itself. You then have to purchase the inverter, panel racking, wiring, overcurrent protection, etc.

That 40 hp motor will draw over 100amps at 230volt and 6 to 8 times that 100amps when it starts. What 3 phase 30kw inverter can do that?

Please stop posting BS.

[hobertek]

But how does a 30kw inverter "start" a 40hp pump? It can't.

Also by the time the OP purchases the 39kw of panels and 3 phase inverter he would be spending over $100,000. He could have installed a diesel gen set and very large fuel tank to get his water and saved $70,000.

solar-pump-inverter--hobertech.com_副本.jpg

30kw inverter can run the 40hp pump ,pls note it is 40HP ,not 40kw , inverter can >= pump power , it have been install in project ,work good , of coz ,you can install bigger inverter ,serive life can be longer

as i know , the 39kw pump and inverter the spend is about $20000-26000

No fuel cost,it is economic

[russ]

water storage replaces battery power storage,

You are talking BS and nothing more - explain better if you are capable otherwise you are history.

[SunEagle]

water storage replaces battery power storage,

But how does a 30kw inverter "start" a 40hp pump? It can't.

Also by the time the OP purchases the 39kw of panels and 3 phase inverter he would be spending over $100,000. He could have installed a diesel gen set and very large fuel tank to get his water and saved $70,000.

[hobertek]

That is no answer - where have you ever seen such a thing? Outside of your imagination I mean.

water storage replaces battery power storage,

[russ]

Without battery,

That is no answer - where have you ever seen such a thing? Outside of your imagination I mean.

[hobertek]

hobertel - Get real or get lost! Who do yo know that us running a 40 hp pump off solar - wit or without batteries?

Without battery,

[Bala]

Those are some serious numbers for moving water.

300m is 426psi,

It must be a typo,

Anyone seriously needing to move that sort of water that height and distance would not likely be on a forum trying to sort it out.

[russ]

according to your sunshine ,40hp ,you can choose the ac 3 phase pump , 30kw solar pump inverter , 39kw solar panel can meet your need ,without battery , water storage replaces battery power storage,or you can use diesel genset at night if water cannot storage big ,just suggestion ,details need to design according to local situation

hobertel - Get real or get lost! Who do yo know that us running a 40 hp pump off solar - wit or without batteries?

[hobertek]

solar water pumping system

Thanks for the replys. The water source is the water stream of a river in a place with an average insolation of 5.34 kWh/m^2/day. The connection to the Utility is not an option on this case basically because there is no grid connection nearby. The PV system is going to be definitely big, but I was thinking that maybe it has more sense to use as back up a diesel genset instead of a huge bank of batteries. Any ideas?

according to your sunshine ,40hp ,you can choose the ac 3 phase pump , 30kw solar pump inverter , 39kw solar panel can meet your need ,without battery , water storage replaces battery power storage,or you can use diesel genset at night if water cannot storage big ,just suggestion ,details need to design according to local situation

[Amy@altE]

Too bad the OP couldn't use a small pump to fill a large tank that can gravity feed the water instead of using a large HP motor to do all the work.

The most powerful solar pump for a river that I know of is Dankoff's SolarForce. It would take a lot of them to do what he wants.

From Dankoff's description: A Dankoff SolarForce provides as much as 5600 Gallons per day (21,000 ltrs.) pushing as high as 230 Feet (70m) or 100 PSI (7 kg/sq. cm). Solar Force Piston Pump draws water from a shallow well, storage tank or surface water source. It can push water uphill and over long distances for home, village, irrigation or livestock uses. It can use power directly from a photovoltaic array, or from storage batteries, to fill a storage tank or to pressurize water.

[SunEagle]

I have no idea about where to find a pump that size. But just for an example of the size PV system you are talking, with VERY rough numbers, if 1HP = 750W x 40HP = 30,000W for 1 pump. You said pumps, but not how many, so I'll do again, very rough math for 1 pump running 1 hour. You can do the math out from there.

30,000W x 1 hour = 30,000 Wh / 5.34 sun hours / .67 efficiencies = 8385W of solar per hour one pump is running.
30,000Wh /.92 inverter efficiency x 1 day autonomy x 50% DoD /48V = 1359Ah 48V battery bank per one hour one pump running

I see a large generator in your future.

Too bad the OP couldn't use a small pump to fill a large tank that can gravity feed the water instead of using a large HP motor to do all the work.