SW2512 and pump problems [RE-wrenches]

[allan]

David,
Windy will probably have more to say in response to your referral to the
SunRise, after he returns from the Flagstaff RE fair.  To pump at full
speed, the SunRise needs 24V to the converter to run at its 60V output,
which you need for the 3.1 gpm you quoted.  With a 12V battery input, (a
jumper is removed in the converter), the pump runs at half speed of 1.5 gpm.
At this pumping rate with a big (or multiple) pressure tanks, you could get
by, but it means one fixture at a time once a bathtub has been filled--ok
for a couple with conservative habits, but not the average home.

Allan at +E
-----Original Message-----
From: David Palumbo, Independent Power & Light <ipl at sover.net>
To: RE-wrenches at topica.com <RE-wrenches at topica.com>
Date: Thursday, September 14, 2000 12:52 PM
Subject: RE: SW2512 and pump problems [RE-wrenches]


>
>Windy et all,
>
>"I could suggest a DC submersible pump, but with a 12V system,
>pressurizing, your choices are severely limited."  Windy
>
> We still do a few systems a year that choose not to use a large inverter
>(or just can't afford the $ bucks for the big Trace). Typically these
>systems use a 1100 Watt Exeltech inverter (either 12 or 24 volt depending
on
>the usual considerations.
> These systems normally do not use a lot of water (50 to 200 gallons per
>day).  With a large pressure tank, 85 gallon is typical (31 gallon draw
down
>at 20-40 psi range), the DC sub pumps work very well for many people.
> Windy sold a few different diaphragm type DC subs over the years and I
have
>some people who still have a Cimarron quad 5000 in the well and working (on
>it's last legs I suspect) after seven years!
> I know the diaphragms must be going so I recently was in touch with the
>homeowners about doing a swap now so we won't have to do it in the middle
of
>winter. So I gave them two options.
> A) Sun Rise Solar Sub 48 volt Model 5226, 3.1 gpm (system has 120 feet of
>head including the 92' in the pressure tank  166 watts power consumption
>(plus what % tacked on for converter/controller inefficiency Windy?). At
100
>gallons per day this pump should run for 35 minutes therefore it will use,
>about, 100 watt hours per day. Compare this with a 1/3 hp ac sub pump at
4.5
>gpm and 800 watts for 325 watt hours (with inverter factor of 10%). Any
time
>we can save 225 Watt hours per day it is worth looking into.
> The Sun Rise (Dankoff Solar) is a piston type pump and it sells for $
1,850
>and needs a DC converter for this 12 volt battery system $ 340. So this
deal
>is pricey but efficient. How long might this pump last down in the hole
>Windy?
> Option B) Shurflo 9300 plastic , diaphragm type 24vdc sub pump. Pumps slow
>at 1.68 gpm with 12 to 24v converter. But it has rebuild kits for the
>inevitable diaphragm replacement. I have customers going too long (4years+)
>between rebuilds with these even though the manufacturer tells us to check
>the diaphragms yearly. What do others see for longevity with these pumps?
>This pump will use, about, 80 watt hours for the 100 gallons per day. Cost
>is $695 plus converter at $ 325.
> I would also consider the Solarjack small DC subs from Kyocera. Was
>recently told that they are being redesigned and will be field rebuild able
>also.
>
>David Palumbo, IP&L
>
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