effluent pump [RE-wrenches]

[John Blittersdorf, Cent. VT Solar & Wind]

Kurt,
   I think we are talking about two different pumping scenarios.  The system 
I am familiar with was a pumping system pumping from the output of a septic 
tank (no solids) up to a mound system leach field about 40' above the house 
and septic tank.  The pump was 3/4 or 1HP and was that large to dose the 
whole leach field quickly to get the fluid into all the side spurs.  The tank 
was just large enough to do one quick dose.  As I said in an earlier post, 
the pump ran once every 6 days or so for 7 minutes was all that was needed.  
I don't think the pump efficiency is all that important in this application.  
Just a large enough inverter to start the pump.  They also had a well pump 
and it could also start at the same time.  We hooked up two T240's, one on 
the well pump (120V to the pressure switch and then to the transformer to 
eliminate the ghost load ) and used the timer for the sewer pump.  We set the 
run time (15 minute window) to fall during the least likely time for the well 
pump to be calling for water.  This off grid home uses about 100 to 120 kwhrs 
per month which also includes 3 pumps for the radiant heat system, power vent 
on the Aquastar, power vent on the gas boiler, and all usual lighting, dish 
washer, Sunfrost 16cf, computers etc.  It is a family of two so I guess the 
pumps would work a lot more if the was larger.  This home is still the best 
system I have installed...1200 watts of PV, Bergey XL.1 wind turbine and 
Backup propane generator which ran only 10 hours during the last year.  And 
the owners are teachers and he is a science teacher so at least some kids are 
learning about RE.

John
CVSolar



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