Posted by *Freedom Reigns* on June 19, 2008, 10:39 am

I need to calculate how many solar panels I need to run 230 volt

sprinkler pump 30 minutes a day. The pump runs at 2500 watts. The

location is Kilauea, Kauai Hawaii.

Assume for instance the panels are 50 watt, 17 vdc, 2.94 amp

How do I calculate how many panels I will need?

Posted by *bealiba* on June 19, 2008, 12:07 pm

*> I need to calculate how many solar panels I need to run 230 volt*

*> sprinkler pump 30 minutes a day. The pump runs at 2500 watts. The*

*> location is Kilauea, Kauai Hawaii.*

*> Assume for instance the panels are 50 watt, 17 vdc, 2.94 amp*

*> How do I calculate how many panels I will need?*

For the information given;

14 panels in series to give you 238V @ 3A

11 parallel strings to give you 2530A

= 154 panels

Perhaps you would like to re-phrase the question. Do you envision the

use of batteries and inverter?

Posted by *spaco* on June 19, 2008, 2:06 pm

2530W not 2530A? I got 7854 watts when I multiplied 3 X 11 X 238.

Doesn't he only need 11 amps, therefore 4 strings = 56 panels?

Awfully pricey though, an way you put it.

Pete

-----------------

bealiba@gmail.com wrote:

*> *

*>>I need to calculate how many solar panels I need to run 230 volt*

*>>sprinkler pump 30 minutes a day. The pump runs at 2500 watts. The*

*>>location is Kilauea, Kauai Hawaii.*

*>>*

*>>Assume for instance the panels are 50 watt, 17 vdc, 2.94 amp*

*>>*

*>>How do I calculate how many panels I will need?*

*> *

*> *

*> For the information given;*

*> *

*> 14 panels in series to give you 238V @ 3A*

*> *

*> 11 parallel strings to give you 2530A*

*> *

*> = 154 panels*

*> *

*> Perhaps you would like to re-phrase the question. Do you envision the*

*> use of batteries and inverter?*

Posted by *bealiba* on June 19, 2008, 11:45 pm

*> 2530W not 2530A? I got 7854 watts when I multiplied 3 X 11 X 238.*

*> Doesn't he only need 11 amps, therefore 4 strings = 56 panels?*

*> Awfully pricey though, an way you put it.*

*> Pete*

*> -----------------*

*> beal...@gmail.com wrote:*

*> >>I need to calculate how many solar panels I need to run 230 volt*

*> >>sprinkler pump 30 minutes a day. The pump runs at 2500 watts. The*

*> >>location is Kilauea, Kauai Hawaii.*

*> >>Assume for instance the panels are 50 watt, 17 vdc, 2.94 amp*

*> >>How do I calculate how many panels I will need?*

*> > For the information given;*

*> > 14 panels in series to give you 238V @ 3A*

*> > 11 parallel strings to give you 2530A*

*> > = 154 panels*

*> > Perhaps you would like to re-phrase the question. Do you envision the*

*> > use of batteries and inverter?*

Consider the answer, it is as correct as the question. Which is the

point.

The question is incorrect. Does the OP intend to have batteries,

inverter?

You would like something a bit more real?

12V system

2250 Wh/day

1 Day autonomy

300Ah Battery

66% Daily DOD

5 PSH/Day

17- 50W Panels

Still over the top. Best ditch the pump.

Posted by *wmbjkREMOVE* on June 20, 2008, 12:44 am

On Thu, 19 Jun 2008 16:45:45 -0700 (PDT), bealiba@gmail.com wrote:

*>> 2530W not 2530A? I got 7854 watts when I multiplied 3 X 11 X 238.*

*>>*

*>> Doesn't he only need 11 amps, therefore 4 strings = 56 panels?*

*>>*

*>> Awfully pricey though, an way you put it.*

*>>*

*>> Pete*

*>> -----------------*

*>>*

*>> beal...@gmail.com wrote:*

*>>*

*>> >>I need to calculate how many solar panels I need to run 230 volt*

*>> >>sprinkler pump 30 minutes a day. The pump runs at 2500 watts. The*

*>> >>location is Kilauea, Kauai Hawaii.*

*>>*

*>> >>Assume for instance the panels are 50 watt, 17 vdc, 2.94 amp*

*>>*

*>> >>How do I calculate how many panels I will need?*

*>>*

*>> > For the information given;*

*>>*

*>> > 14 panels in series to give you 238V @ 3A*

*>>*

*>> > 11 parallel strings to give you 2530A*

*>>*

*>> > = 154 panels*

*>>*

*>> > Perhaps you would like to re-phrase the question. Do you envision the*

*>> > use of batteries and inverter?*

*>Consider the answer, it is as correct as the question.*

No, the question is just fine. Of several responses, yours was the

only wholly defective answer.

*> Which is the*

*>point.*

LOL Do you ever consider pretending to be a normal person, and simply

write "sorry, I screwed up again"?

*>The question is incorrect.*

No.

*> Does the OP intend to have batteries,*

*>inverter?*

He could do it with or without batteries. Either way you'll be of no

help.

*>You would like something a bit more real?*

Perhaps you mean less wrong...

*>12V system*

*>2250 Wh/day*

*>1 Day autonomy*

*>300Ah Battery*

*>66% Daily DOD*

*>5 PSH/Day*

*>17- 50W Panels*

Wrong again.

*>Still over the top.*

For sure. On a battery-inverter setup he probably needs less than half

the PV you're deezining. On a solar-direct installation, even less. In

fact, a friend has an 800W setup that powers his entire place,

*including* running a 1.5 hp submersible for a half hour per day.

*> Best ditch the pump.*

That remains to be seen. I pump a similar amount of water per day, and

found it best to use a conventional pump. Only if I were to pump a lot

more water would it pay to use a premium model instead.

Wayne

> I need to calculate how many solar panels I need to run 230 volt> sprinkler pump 30 minutes a day. The pump runs at 2500 watts. The> location is Kilauea, Kauai Hawaii.> Assume for instance the panels are 50 watt, 17 vdc, 2.94 amp> How do I calculate how many panels I will need?