I believe my PV-water-heating friend has an Outback in diversion mode,
so the charge profile is stepped, as Conrad noted. He has a 4 kW PV
system and a frugal household, so in the summer it takes care of about a
third of his DHW needs.
Hilton
--
Hilton Dier III
Renewable Energy Design
You mean like this? http://www.ngeus.com/SunBandit.aspx
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Hi Wrenches,
Thanks for your input. I agree that the PV water heating setup as I presented
it has some obvious issues. However, as PV folks I think we all have a
gut-level aversion to using PV energy for heating of any kind. As modules
continue to get get cheaper I think some heating
. Ice lasts for a week.
Works pissah.
Conrad
Cotuit Solar
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Allan
Sindelar
Sent: Tuesday, May 14, 2013 11:24 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] PV-direct electric water
Luke,
Most tankless hot water heaters can't accept pre-heated water. Some of
them can, but even still these have a minimum heat input into the water.
You may run into a situation where you have 105F water into the tankless
and the thing won't fire up due to safety reasons (can't put out 130F or
At SPI last year there was at least one company offering this, and
there's another company from Tallahassee also looking into it:
www.usa-eds.com
I'm not an expert by any means but I think that even 120F doesn't kill
legionella-- you need to get to 140F. And even if you do 140F, I imagine
Hi Luke
I am doing this with a 1200 watt array that is AC coupled to my off grid home
inverter. I am using an SMA 1800 inverter because it is 120vac. I use a relay
connected to the AC output that connects the 4500 watt water heating element
to the AC breaker panel when battery voltage reaches
Luke
I know that this is different than your off grid situation, but I have a
grid connected home with 2.4KW array AC coupled with an 1.8kw Exeltech
system to an Outback that has been powering my all electric house to
include an electric instant hot water heater ( 2 x 55amp 240 circuits!), I
even
A friend of mine lives off grid with PV and wind. He added a shunt-type
controller to his battery bank and connected it to a DC heating element
in his hot water tank. Below a set voltage the element is dormant. When
the battery bank hits a high voltage (at the end of a particularly sunny
day
Hi Hilton
What controller did he use?
Jay
Peltz power
Sent from my iPhone
On May 14, 2013, at 5:22 PM, Hilton Dier III hiltond...@gmail.com wrote:
A friend of mine lives off grid with PV and wind. He added a shunt-type
controller to his battery bank and connected it to a DC heating
Hilton,
That sounds like a good idea at first glance but a bad one when
you dig a bit deeper. In essence he is sacrificing proper
absorption on the batteries and will pay the price in reduced
battery capacity and life. As soon as the batteries reach the bulk
if they are using
water during the day and thus always adding cold water to the tank, would be an
exercise in futility and a waste of good PV.
Tom
From: Luke Christy
Sent: Monday, May 13, 2013 4:59 PM
To: re-wrenches@lists.re-wrenches.org
Subject: [RE-wrenches] PV-direct electric water heating
Hi
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