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Solar hot water systems

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Posted by Lionel on December 13, 2005, 1:02 am
I'm interested in installing a solar hotwater system (I'm in Brisbane,
Australia). I'm just wondering how well they work, how much do they cut
down your power usage for hotwater generation? Also, are you better of
with gas or electricity back up, and what are the things to consider in
such a case. I would like to install this in a two bedroom unit.



Posted by caraug on December 15, 2005, 2:25 am

Have a look at :
and download their free Excel program to calculate solar domestic hot
water systems.  This is from the Canadian Government and it is NOT a
commercial web site.  They claim to have solar data for the world (but I
haven't checked for Australia).  You must know the properties of your
solar panels to run this program - it's really well done.  It has the
economic calculations too.

For me in New England, the saving in energy is typically 60-70% for a
4-person house.

Try it out and let us know.



Lionel wrote:

Posted by Gary on December 15, 2005, 3:50 am
 Lionel wrote:

SolaHart has a software package called SCF that does very detailed solar hot
systems analysis.  You can set your city (Brisbane included), and what type
of system you are interested in, and it estimates month by month hot water
output, energy saving, and greenhouse gas reduction.

They used to offer this as a download from their site, but now it is apparently
available through their dealers.  You might ask a local SolarHart dealer for a
Or, I could email you a copy.



"Build It Yourself" Solar Projects

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