PV: Re: pvusers V1 #546

[Dave Robison <drobison@teleport.com>]

At 02:00 AM 1/23/01 -0500, you wrote:
>Date: Mon, 22 Jan 2001 23:52:13 -0500
>From: "John D. Shelton" <ehfone@mindspring.com>
>Subject: PV: hot water heater timer
>
>As someone who doesn't have a PV system yet (I'm in the Navy and can't
>settle in one place, but when I retire.....) I am concentrating mainly on
>conservation. I am going to buy a timer for my electric hot water heater and
>need to ask a couple of questions of anyone who might already have one
>installed. It is a typical cheap renters appliance. I don't know the
>capacity but it's about 5 feet tall. I plan to set it to turn off at ten
>p.m. and turn on in time for me to shower at about 6 a.m. What time would I
>need to set it to turn on to get hot water at six? Any other hints on
>installation? Thanks folks.
>
>John David
>

You can figure it out. The standby losses are actually minimal overnight. 
What happens is the thermostat drops to the point where it triggers "on" 
and then has to heat most of the water to the point where it triggers 
"off". Say 40 gallons affected, 10 degrees delta, maybe 1 kWh. If you have 
a 2kW heater element, that's 30 minutes. Typical recovery time.


==========================
Dave Robison

-*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*
To unsubscribe send an email to majordomo@crest.org with the following
command in the body of the message:
unsubscribe pvusers
Email the list administrator at: owner-pvusers@crest.org
List sponsored by CREST/REPP
http://solstice.crest.org/   http://www.repp.org/