That's not terrible. 7,000 watt hours with a 50 watt load (that's
typical on our smaller remote sites) would get you 5.8 days run time.
bp
<part15sbs{at}gmail{dot}com>
On 3/23/2016 8:38 PM, Chuck McCown wrote:
2.2 kWh
Batts of that size would cost $700
1.8 kW inverter. That would cost $450
They plan to sell it for $1700. And they are not saying that this can
pull the one single load for one hour.
It will store about 25 cents worth of power.
Tesla is 7 kWh.
I use about 50 kWh/day. Tesla would run my house for 3 hours on
average, but since the power consumption is not continuous, when I am
actually using lots of juice it would probably last for less than an
hour.
*From:* Sterling Jacobson <mailto:sterl...@avative.net>
*Sent:* Wednesday, March 23, 2016 8:22 PM
*To:* af@afmug.com <mailto:af@afmug.com>
*Subject:* Re: [AFMUG] Tesla 7kWh powerwall as UPS?
I purchased one of these to play with:
https://www.kickstarter.com/projects/ericclifton/orison-rethink-the-power-of-energy
I’m not sure exactly how they work their magic, but you should just be
able to plug it into the same power strip and it will charge, and
supply power in case of an outage?
All on a common 15amp 110v plug.
We’ll see how it actually goes in August when I get mine.
I also pre-ordered a powerwall like a year ago and haven’t heard much
back from Tesla.
I would probably use the powerwall in a solar setup combo if I move.
It’s tempting to get a few and string them together for my office, but
it would take some creative engineering to wire it in correctly on a
transfer switch I think.
*From:*Af [mailto:af-boun...@afmug.com] *On Behalf Of *Eric Kuhnke
*Sent:* Wednesday, March 23, 2016 7:54 PM
*To:* af@afmug.com
*Subject:* Re: [AFMUG] Tesla 7kWh powerwall as UPS?
There's not a lot of technical information available about them, don't
they have an integrated sinewave DC-to-AC inverter? I could be wrong
but I believe they output AC. Assuming a typical installation for
their target market, residential, do they require purchase of a
separate DC-to-AC inverter?
They're rated at 3.3kW load (AC) to power a house.
On Wed, Mar 23, 2016 at 6:48 PM, Bill Prince <part15...@gmail.com
<mailto:part15...@gmail.com>> wrote:
Only hassle is that they are 450 volts (or in that neighborhood).
Big challenge finding DC-DC converters for that, or maybe go back
to battery-inverter-DC power supply design.
bp
<part15sbs{at}gmail{dot}com>
On 3/23/2016 6:45 PM, Eric Kuhnke wrote:
$3000 is not so bad for something that can deliver up to 5kW
for multiple hours...
http://arstechnica.com/business/2015/09/tesla-powerwall-home-installations-are-starting-for-pilot-customers/
I am interested to see the results of integrating two of these
in parallel with an off grid solar array. At first glance it
appears a great deal less expensive than buying a dozen 12V
200Ah lead acid AGM batteries to make a string. And should
last a lot longer in 60% cycle depth daily cyclic use.
Interesting they've cancelled the 10kWh model ($3500) which
had a much shorter lifespan, the 7kW model is rated at 5000
cycles.
