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15.10.2015
As someone who follows the battery industry very closely, I know that there are a lot of startups and large corporations looking to get a huge chunk of the battery storage market for themselves via their own innovations, competitive advantages, and perhaps even breakthroughs.
However, I have also read on a number of occasions that Tesla has the lowest-priced battery packs among all electric car manufacturers, and that the scale of production it would gain from the Gigafactory it is building with Panasonic would enable even deeper price cuts. Yes, there were pilot rollouts of Tesla’s batteries pegging them at about $13,000 for 10-15 kWh systems. Unfortunately, that leaves out the inverter and installation costs, but still, this is a very low price for lithium-ion battery packs. “Nothing remotely in these price points,” Elon reportedly noted at the product release last night (or early this morning, my time). Other benefits include the fact that this is wall mounted (and can even be mounted on an exterior wall) and can be installed by just two people in half an hour to an hour.
And that’s still not taking into account some of the competition from non-lithium-ion battery companies. You can find out more about the product on Tesla’s Powerwall page or on the press page about the announcement. Keep up to date with all the hottest cleantech news by subscribing to our (free) cleantech newsletter, or keep an eye on sector-specific news by getting our (also free) solar energy newsletter, electric vehicle newsletter, or wind energy newsletter. Zachary Shahan is tryin' to help society help itself (and other species) one letter at a time. Also to add something about how this can change people’s relationship with the utility. 15-20 years ago I remember reading a story about an older woman that got evicted from her home after deciding that increasing power bills would not fit in her budget so she had it turned off.
Tried a quick search to find it, but a new story from February of last year turned up, which said that Florida homes are still required to have connections to electricity and water by law. Another story that I heard but have been unable to verify, is that in Texas even if you don’t get a meter installed you still get charged a minimum fee on the property taxes for maintenance of the wires that pass by your property.
While they usually aren’t as strict about this type of thing in rural areas (part of my reason for retiring out here) some parts of the US are crazy enough (cities especially) that even if you should be able to provide for all of your electricity there will still be some sort of a payment required for the utility. Unfortunately we have allowed our utilities to become such large monopolies that they can influence regulatory matters like this in their own favor.
While I am very much a peace loving left over hippy at times it is necessary to wonder if we will ever get the changes needed without a revolt against our corporate and political aristocracy. Perusing the Panasonic 18650B data sheet reveals that cell losses rise substantially at high currents. From the chart provided in the datasheet, a charge and discharge rate of around 0.2C mitigates the above undesirable characteristics. Only Tesla use 18650 cells to make storage batteries, because in the real market place, don’t suit the application. The numbers for how the pack is built seem about right except the cell voltage is too high.
You make a great point of showing how its constructed, but fail to show how its unsuitable for its intended market.
If you listened to the investor calls, you would hear Elon Musk saying its not economical for most users in the US.


And Musk stated a lot of people are buying them because they want them, or they want emergency back up, not on energy economics. Because of the cell’s characteristics, to obtain a plausible, let alone useful power output, a large number of cells are required, resulting in a large capacity.
Other manufacturers choose a cell that is appropriate to the task, because they need to compete. If may or may not be possible to profit from home energy storage – that is not the point, but the role that the battery plays in obtaining that profit. No matter what Straubel says of any country or system, there are batteries that will better the Powerwall given the same conditions.
Comparing batteries using only the storage cost kWhr, is like comparing the cost and financial viability of an aircraft and a car, by comparing their volumes. When Telsa’s cell price is compared with other cells suitable for home storage, they are not a bargain. Tesla are rolling the dice on their borrowed Panasonic cell, but that cell is dated technology, even now.
That statement is taken out of context because it refers to many US residences that are connected to the grid in low electric rate areas and is true.
But your use of that quote is a direct contradiction of your assertion that Musk is trying to hide the fact that Tesla batteries are not economic (in some areas). However, it was hard to figure out how all of that might translate to the stationary storage market, and allow it to compete in this market (where home storage is still dominated by low-cost lead-acid batteries, and grid storage can be provided via flow batteries and other technologies).
I posed the question to three of our readers who have been living off the grid for years and know the ins and outs of these systems quite well.
Furthermore, it has landed partnerships with several major companies in and out of the battery space, including Target (perhaps also Walmart, unless someone mixed up the two), Amazon, AES, Southern California Edison, EnerNOC, SolarEdge, and more.
After years of covering solar and EVs, he simply had a lot of faith in these companies and felt like they were good companies to invest in. The Solar City link just says they will engineer an off grid system for you and give you a quote. If a residence can be cost competitive with the utility they are doing something very wrong.
The PUC and rate rules incentivize them to take advantage of rate basing, that is, amortize a lot of capital intensive central generation and encourage demand to pay it off.
You calculate the cost per kwh by the total system installed cost and then a formual tells you the cost per kwh.
In this case she had solar, but they were following up on the eviction because she had made free use of the city sewer system getting her water from collecting rain. NMO has a greater cycle life, but even then, charge and discharge current must be minimized if that is to be preserved.
But that can be aided by demand management, which is also a possibility with the PowerWall. The number of cells in series is more likely 110, with V open circuit about 3.6V fully charged and resting.


Hyperbole and marketing have pushed this ridiculous Powerwall, to the point that it will cost many who can’t afford it. What exactly is hidden in an announcement that shows the cost of a complete system, various vendor relationships, options for leasing or full purchase, etc? You calculate the cost per kWhr by totaling the accumulated energy, and divide the result by the time you are willing to wait for a return.
Furthermore, while the market is expected to grow in leaps and bounds, it’s still a tough financial sell for the huge majority of homeowners in the developed world. Now, with theirs, there is a bigger space and weight to consider, but for people with the extra room, it might be enough of a price difference to deal with that,” Offgridman added.
Allow the nominal voltage of each cell to be 4.0V, A series string of 100 cells gives 4*100= 400V. Tesla are a one-horse outfit, who use the same cell for everything, whether it fits the application or not. But, in specialist fields that are not at all connected or in competition with any of the competing home storage manufacturers. Do you have any idea of the worth of their patents, or do you simply assume that because of the patents, their battery must be something special?
A storage battery must also provide adequate power output, or it will not be an economical proposition. You slung a lot of trash at Tesla saying they are con men and duping people into believing their batteries are economic.
Furthermore, it has seemingly been dominating contracts under California’s Self Generation Incentive Program. Zach is recognized globally as a solar energy, electric car, energy storage, and wind energy expert. When demand sags, central generation gets mothballed and the system demands ratepayers pay for unused, stranded assets.
The same applies to discharge rates, because you can only recharge what has been discharged. This system needs reform or maybe it will just become obsolete as conservation and distributed renewables take over.
Solar City is making it clear that they will respond aggressively to utilities turning down users that want solar by providing a solution that makes them independent of the utility. For those that thought utility death spiral was just PR, watch what happens in the next three years in Hawaii. The utility will have to do something like EON in Germany and split and divest the stranded asset central FF generation side.



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