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
Hello,
I was asked to look at a site today for a homeowner looking for a grid-tie with
battery-back up. They are Doomsday Preppers for lack of a better term and want
certain loads if and when the grid goes down for good. Aside from parts
selection, they have two roof lines, one facing SE one
Jesse,
A good decision can be based on, among other site/load specific details, the
site's micro-climate.
Do they tend to have clear mornings and cloudier afternoons/evenings?
...or cloudy/foggy mornings and clearer afternoons/evenings?
Maybe throw the different directions into PVWatts and
We do tend towards clear mornings and clouding up in the middle of the day.
Today was a good example of it. I did use PV watts and didnt see a big
difference between the two.
Thanks Benn
Jesse
Sent from my iPhone
On May 14, 2013, at 6:10 PM, Benn At DayStarSolar b...@daystarsolar.ca 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 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
Thanks for pointing that out Dave.
PVWatts is a great tool but you're right, unfortunately it doesn't account for
snow cover.
It's best to go into the derate settings and using your knowledge of the
different site/equipment factors, adjust accordingly.
benn
Sent from a 'smart' phone, with
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
Take a look at www.usplastic.com and check out their polyethylene tanks.
TAMCO is one brand I have used. A 36 x 20 x 20 tank will hold four
large-ish batteries (L-16 or similar) with room to spare. The lids need
some foam tape for air sealing, but otherwise they are acid resistant
and
Does PVWatts really account for hourly weather data such as overcast
conditions in the afternoon? I think it just accounts for average solar
radiation for a particular location on a monthly basis but I could be
wrong. Anyone care to chime in?
-August
*August Goers*
VP, Engineering
o:
Jesse,
Based only on the info you provided, I'd recommend the SE face. A
low slope is best for maximizing annual gain, which is what a
conventional grid-tie customer would want. But you are in essence
giving them a system that will function as GT now, but as an
Allan,
That is pretty much my thinking. They have 0 interest in stepping foot roof
and the SE give more tilt and easy ground access to clear the array during
winter.
I appreciate the advice.
Jesse
Sent from my iPhone
On May 14, 2013, at 10:15 PM, Allan Sindelar
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
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