The 10kWh version was just cancelled, it's been in the technology press in the last few days.
On Wed, Mar 23, 2016 at 8:49 PM, Sterling Jacobson <[email protected]> wrote: > I think they have two versions of powerwall? > > One that floats as backup mostly, and another that is solar fed and drains > many cycles? > > Would those be two diferent battery types in them then? > > > > *From:* Af [mailto:[email protected]] *On Behalf Of *Eric Kuhnke > *Sent:* Wednesday, March 23, 2016 9:48 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Tesla 7kWh powerwall as UPS? > > > > The thing is... Calculating lead acid batteries as 30 or 15 cents per kWh > to purchase doesn't take into account lifecycle cost. If the lead acid > batteries are only good for 800 to 1000 cycles, absolute maximum, and the > competing battery option is twice as expensive but lasts for 4000 or 5000 > cycles, the more expensive option actually costs a great deal less. > > It remains to be seen whether the powerwall will really hold up to > thousands of cycles. > > > > On Wed, Mar 23, 2016 at 8:45 PM, Chuck McCown <[email protected]> wrote: > > 7/5=1.4 hours at full load. > > > > Batts are about 30 cents per watt hour for AGM, half that for flooded > cells. > > Inverters are about 25 cents per watt. > > > > 7kWh battery == $1125 –$2250 > > 5 kW inverter == $1250 > > Put it on your critical loads. Charge the batts with a rectifier that is > fed from commercial power. > > You can run the inverter all the time, or use a smaller charger and put in > a transfer switch. > > Transfer switches/contactors are not very expensive. One single relay > will do the job. > > > > *From:* Eric Kuhnke <[email protected]> > > *Sent:* Wednesday, March 23, 2016 7:45 PM > > *To:* [email protected] > > *Subject:* [AFMUG] Tesla 7kWh powerwall as UPS? > > > > $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. > > >
