The tactical nukes might be going slightly overboard, but everything else seems reasonable. I certainly can't see any harm in having the 50 caliber on the back of the jeep... just in case.
On Sat, Mar 26, 2016 at 9:51 AM, Chuck McCown <[email protected]> wrote: > I didn’t notice any decrease in range on the Leaf. I have had two of them > for two year each. Temperature makes a huge difference but that is the > only thing I noticed. > > The batts, Tesla or otherwise will never make economic sense. You get > them as a secondary backup source. A natural gas back up generator would > be much more practical and much less money. Then if you are a ... prepper, > then you get the batts, and perhaps a propane tank with a propane to > natural gas carburetor. And a 100 ton pile of coal and fire wood etc > etc. 50 caliber mounted on the back of your jeep. Tactical nukes etc. > > *From:* Rory Conaway <[email protected]> > *Sent:* Friday, March 25, 2016 11:14 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Tesla 7kWh powerwall as UPS? > > > My problem with the product is the lifespan. Based on my experience with > the Leaf, charging and discharging means it starts losing storage capacity > after 18 months. After 3 years, it’s probably going to be down to 80-90% > of storage life. In 4-5 years, it’s junk. At that price, even if you > have solar running all day, the savings differential between what you are > able to sell with your overage and wholesale pricing against not having to > buy back energy at retail pricing doesn’t make it worth it yet. I haven’t > calculated the differential between always buying energy during non-peak > times but I still can’t imagine the battery paying for itself. In our case > though, with the Leaf, we need at least 4 of these to even break even on > the energy to charge the Leaf. Then to make it worse, we are probably > getting a Chevy Bolt or something else with a 60kWh battery in April next > year. > > > > Rory > > > > *From:* Af [mailto:[email protected]] *On Behalf Of *Bill Prince > *Sent:* Friday, March 25, 2016 11:09 AM > *To:* [email protected] > *Subject:* Re: [AFMUG] Tesla 7kWh powerwall as UPS? > > > > That depends on what you pay for a KWH. If you're paying 15 cents per KWH, > then you are somewhere in the neighborhood of 1466 KWH per month, or 48 KWH > per day. > > We're on a sliding scale. Lower usage is cheaper (11-12 cents per KWH). > Once you go over tier 3 usage it is over 30 cents per KWH. > > > bp > > <part15sbs{at}gmail{dot}com> > > > > On 3/23/2016 8:48 PM, Sterling Jacobson wrote: > > What are you doing that uses 50 kWh/day? > > > > Is that to charge your car? > > > > That can’t be normal. > > > > I think my power bill is around $220 a month, what is my average kWh/day > based on that? > > > > *From:* Af [mailto:[email protected] <[email protected]>] *On > Behalf Of *Chuck McCown > *Sent:* Wednesday, March 23, 2016 9:39 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Tesla 7kWh powerwall as UPS? > > > > 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 <[email protected]> > > *Sent:* Wednesday, March 23, 2016 8:22 PM > > *To:* [email protected] > > *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:[email protected] <[email protected]>] *On > Behalf Of *Eric Kuhnke > *Sent:* Wednesday, March 23, 2016 7:54 PM > *To:* [email protected] > *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 <[email protected]> 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. > > > > > > >
