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Posted by carneyke on May 19, 2006, 10:55 am
 
Do a search on EL Sid pumps. Not sure if it will do the 4 meters, but
it may be worth contacting the supplier. I put one in my DHW system and
it works fine, cost around $ 220 US (ouch !). Take Care, Kevin
Mike wrote:


Posted by Mike on May 21, 2006, 11:11 pm
 

EL Sid pumps are only suitable for lower heads up to 2 metres, would have to
put several in series to get sufficient flow @ 4M head, this makes it too
expensive.

Cheers
Mike



Posted by Jeff on May 19, 2006, 4:43 pm
 <snip>

   Mike,

   Why don't you post this over in alt.solar.photovoltaic, might get a
quicker answer there.


   You are off the mains?


Put two in series to boost the head. Works with fans, front to back. In
your case I don't know whether front to back, or the second half way up.

Sounds like you are almost all solar. I'm terribly impressed!

   Cheers,
Jeff


Posted by Mike on May 21, 2006, 11:25 pm
 Hi Jeff

Yes am off the mains supply, not cost effective to move to 100% PV, but
solar heating and hot water are things that can be built DIY, making it very
cost effective for anyone who wants to have a go. There is plenty of reading
material available and groups like this are great for getting ideas and
advise.

Series pumps work, but starts getting expensive. I have a solar heating
application that requires pumping to a 4m head at 15 litres a minute, so far
cannot locate a suitable DC pump, may have to go to an AC pump running off
an inverter.

Cheers
Mike




set-up.


Posted by Jeff on May 22, 2006, 1:26 am
 
   Hi Mike,

  I've never lived more than a mile from a freeway or a less than 100
feet from a neighbor. But it seems to a city boy like myself that solar
is the way to go. Why use a resource you don't need?

  There is plenty of reading

I was looking at one earlier today at a home improvement store here (in
the states) that looks like it would do that (20 foot head), About $5
US. What's the downside of using an AC pump with an inverter?

   Also, I believe that with drainback that once you fill the pipe and
complete the loop that the head drops to near zero (I believe I read
that in this group, you would have to verify). Seems to me that you
could use the pump with the inverter to start and switch to a lower
draw, smaller pump to circulate. You might get too much flow with the
high head pump.

  I imagine that electrity is a precious commodity for you, I have Amish
friends and they say electrity is very expensive because theirs comes
from AAA batteries! (All Amish seem to have a one cell LED flashlight in
their pocket).

   Haven't found mini corrugated aluminum yet... Thanks for all the tips.

   Cheers,
Jeff


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