Posted by danny burstein on June 26, 2010, 9:05 pm
Ok, the payback time is probably two or three centuries, but
I'd like to at leat think about this.
Situation: I've got an apartment whose main power use is
a manual defrost freezer, pulling about 90 watts when in
use and running about 1/3 of the time. In other words, the
total monthly kw-hr usage is something like 25 kw-hr when I'm
not around (and more, of course, when there).
I can put about 30 square feet of solar cells outside
the window, which would get me something or another...
So what I'd like to do is get some sort of "a/b switch"
which will feed the freezer from the battery bank when
it's charged up, or from the utility line at other times.
Should be a simple concept. Solar cells, battery,
Obviously such stuff is out there, but I'm blanking on
the search term for this controller.
(Oh, and all suggestions appreciated. Even the "you're
a moron, this will never make sense" type).
Knowledge may be power, but communications is the key
[to foil spammers, my address has been double rot-13 encoded]
Posted by Jim Wilkins on June 26, 2010, 10:41 pm
You could look into RV refrigerators, or find out how much cold space
you really need and buy a smaller fridge.
Posted by m II on June 28, 2010, 2:34 am
That's a moronic thing to suggest. Larger units run more efficiently per
Posted by m II on June 28, 2010, 10:29 am
The medication affected that thought.
I really have no grip of such complicated things.
Posted by vaughn on June 26, 2010, 11:26 pm
I play this mental game also. Heck, I've already got a couple hundred watts of
PV panels and the batteries installed with a charge controller. But even then,
it STILL makes no economic or practical sense for me to try to actually run any
110 VAC loads on a daily basis. So I just run some 12 volt lighting with my
If you WERE to do what you are thinking, one of those small grid-tie inverters
would be the way to go. Forget the batteries.