If both your solar lighting and solar water heating
systems were sized properly they should offer more than three days back up
capacity. Certainly more capacity can be added to a residential lighting
or water heating system if your budget allows.
We regularly recommend that the primary power
system be renewable based and that our customers use the grid as a back
We offer our customers the capability to switch
back and forth between the two at will. Perhaps this capability would work
for you also.
Another thing to consider is that a small wind
generator might have provided power while the Sun was hiding behind the clouds
for so long.
----- Original Message -----
Sent: Wednesday, March 07, 2001 9:11
Subject: [hreg] Propane vs.
I am trying to decide which is the best way to go
for a back up
system. While I plan on using solar heaters for my
domestic hot water
and most of my hydronic heat, this will not always
work. Last week was
a good example. My solar lights all quit
and were off for 3 days. This
is too long to go without hot
I have been looking at the tank less water heaters and I
think that is
what I will use for back up. I am wondering which will
be the cheapest
to operate long term in not only dollars but environmental
impact. I am
staying on the grid since my well is too expensive
to operate on PV and
I have planted a lot of trees that do need help
for the first few years
as well as real bad years like the last one.
My electric is natural gas
to electric generated about 15 miles from
We will also be using wood burning stoves as back up
heat. We are
making a habit of contacting people we see with piles of
wood that are
obviously going to be burned on their land. We get
permission to cut
and load all that we can use from the pile for either
heat or mulch. We
feel that if it is going to be burned, we might as
well get some good
from it rather than just pollution.
suggestions? Comments? Thanks
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