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
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.
Posted by bealiba on June 19, 2008, 11:45 pm
Consider the answer, it is as correct as the question. Which is the
The question is incorrect. Does the OP intend to have batteries,
You would like something a bit more real?
1 Day autonomy
66% Daily DOD
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), firstname.lastname@example.org wrote:
No, the question is just fine. Of several responses, yours was the
only wholly defective answer.
LOL Do you ever consider pretending to be a normal person, and simply
write "sorry, I screwed up again"?
He could do it with or without batteries. Either way you'll be of no
Perhaps you mean less wrong...
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.
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.