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IMHO, you should not use an AC pump in this well at
all. You should use instead a quality DC pump (like Dankoff) and either
provide DC power to this pump from your PV/battery system or
preferably provide this pump it's own PV supply. This system would be
used to pump water while the Sun shines into a tank or cistern. You then
draw from this tank as needed using gravity or a DC booster pump to give you the
desired water pressure.
As an alternative, depending upon your ambient wind
conditions you could use a Whisper wind turbine, or a pneumatic airlift water
pumping windmill.
Any inverter and step-up transformer strategy will
be expensive and inefficient.
SBT Designs 25840 IH-10 West #1 Boerne, Texas
78006 210-698-7109 FAX: 210-698-7147 www.sbtdesigns.com
----- Original Message -----
Sent: Saturday, January 19, 2002 11:58
AM
Subject: [GBlist] deep well submersibles
- AC or DC?
Group:
We drilled a well on a hill top, and had to go down 500ft to
get 3-5gpm. The static level is about 100ft. below the
ground.
The PV system is 3Kw, but there is only one inverter (no 240
Volt).
A DC deep submersible pump runs about $1500. A 1/2 HP
Gould (for example) will cost a few hundred dollars and run on 110V - BUT the
system will still require a large holding tank and a 1/4 or 1/2HP DC pump (??)
to pressurize the house.
OR, I can use a 3/4 to 1 HP Gould pump with a step-up
transformer (to produce 230volt) and a BIG storage tank (should I have a
concern about the load on the inverter??).
What is the BEST way to handle
this?
Richard
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