Hi,
I would like the specs for all or any part of the system for a pump,
storage tank, and water line and
solar system for some property in Baja Mexico. It never freezes so
large above ground storage tanks are used. We would use solar power
for the pump. We will buy the pump and solar sytem in the US.
The well is 62 feet deep to the surface of the water. We estimate that
the location of the well is about 30 feet above the ground level of
the house. That would produce about 15 psi of head pressure through a
gravity feed without considering friction loss in the pipe. I was
thinking of laying 1 1/2 inch pipe from the well to the house site
which should supply plenty of water with little loss of pressure.
That's one  long pipe (500 mt)!
We would need enough water for 10 people. 

Thank you,
Craig

Hello Craig,
     I am a water operator for a very small system in Idaho (50
connects) and have some personal experience that may apply to your
question. First there have been many studies done on average water
consumption per person daily. The numbers I have seen range between 60
to 160 gallons per day per person. I would guess that you will tend to
be frugal with your water and the 60 gallon figure would be plenty. We
can then estimate about 600 gallons per day required.
     Next you say that it is 62 feet to the water surface. The term
"drawdown" refers to the change in the depth to the water surface at
maximum pump rate. I hope that your well is adequate and that there
will be little drawdown. However, you still will want to position the
pump some depth below the static surface (62 feet). You did not say
what the total depth of the well might be, but hopefully it is deep
enough to allow you to set the pump a suitable distance below the
static surface.
     I am not selling Shurflo brand pumps, but the web page that I
found to have the best specifications happens to be for their line of
pumps. You can use their specs to compare to any other brand you
choose. Here is a link to the specs for the pump that I would choose:
http://www.windsun.com/Water/9300_Pump.htm
If we assume that the total lift you need is about 100 feet, then you
can read from the chart that the pump will deliver 103 gallons per
hour and reqires a solar panel array with a minimum 99 watt capacity.
If we can assume that your location will supply at least 8 hours of
sun per day, then you can expect a maximum of 800 gallons per day
delivered to your storage tank.
     A very important consideration is how much reserve capacity you
want for cloudy days or emergency situations. You could achieve this
with either batteries or storage tank capacity. I would choose as
large a storage tank as practical. You would in theory be pumping 200
excess gallons per day that could be held in reserve.
     The 1 1/2 inch pipe to the house sounds like a good idea. The 15
psi won't blow your socks off, but should be adequate. Don't forget
that your static head pressure includes the actual distance to the top
of the water level in your storage tank.
     I have made quite a few assumptions here, but I think that they
are probably pretty close to what you will actually find. If you see
any errors in my thinking or assumptions, I will be glad to discuss
them with you.

Good luck, Redhoss