Posted by carneyke on March 21, 2006, 7:06 pm
I've seen some great ideas on the heat exchanger tank and now have some
questions on the pump. I would like to keep it 12 Vdc as my hot air
solar setup now has a solar photovoltaic charger / battery and AC
charger. I have been finding some really nice pumps on the internet
that are made for this application in 12 volt but are a little pricey.
I got my heat exchanger for free so $ 220 US isn't all that bad for a
pump. I have a link for one of the pumps :
Anyone have any ideas or sources for a 12 Vdc pump / low power that can
handle the temperature / pressure of a solar collector ? Thanks, Kevin
Posted by Derwin on March 21, 2006, 9:51 pm
You might consider a Rec. Vehicle store, or a marine supply.
Posted by Steve Shantz on March 22, 2006, 3:15 am
I installed two El Sid pumps for my system, and I'm very pleased with
the performance. I have a 20 watt PV for my glycol loop, and a 3.5 PV
for the water side of the heat exchanger. The 20 watt pump is
driven by a 30W PV panel, and the 3.5 Watt pump is driven by an 8W
panel. You could probably get away with 5 or 6W for the small pump.
Yes, they are a bit pricey, but well worth the investment. I was told
at a solar DHW seminar that differential themostats are a major source
of call backs for installers.
Posted by carneyke on March 22, 2006, 1:17 pm
Steve, Thank you for the information. Does the El Sid pump come with
pump assembly and driver for $ 220 US or do you have buy the pump &
driver seperately ? I saw a part number that indicated a 12 Volt pump
with driver for $ 220. I can contact the supplier for the information,
if you don't know. I'll go with the 10 Watt battery version as my hot
air system has a solar charging panel with battery and power supply to
trickle charge. Thanks, Kevin
Steve Shantz wrote:
Posted by Steve Shantz on March 26, 2006, 11:03 pm
Marsh pump body and the El SID driver for the $20. (Most of the money
is in the driver.) You might want to contact the site to double check.