Thursday, November 05, 2009

More Comment on EEstor

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EESU Charging Infrastructure

The EEstor issue has cause quite a bit of activity and interest on this blog, be it for real or just another stock promotion scam. Comments are flowing in on the subject. When I get comments that are intelligent, relevant, and current, I like to publish them as a post. The following IMHO is one such comment.



Comment from "hendersn":

If EESU's (Electrical Energy Storage Units) are used to store energy at the 'gas' stations, they can provide the high transfer rates necessary to 'fuel' the cars.

Yes, many EESU's would be required at a given 'gas' station to ensure that the peak usage wouldn't exceed the storage capacity, but as long as the average energy consumed over a day by fueling cars doesn't exceed grid capacity to the 'gas' station, this is feasible.

If you can charge the station's EESU's at off peak times, you can actually improve grid efficiency by reducing the ratio of peak to average power delivery.




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3 comments:

Ricardo said...

If an EESU-powered vehicle owner owns another EESU specifically for the purpose of recharging it overnight during off-peak hours and then, in the morning, transferring the charge from it to the vehicle's EESU in minutes, there is no need for the vehicle owner to visit an EESU-equipped gas station ever again, except in those rare instances where distances are so long that overnight stays away from home are necessary.

Madeye said...

Well, it's hardly 'another stock promotion scam' as EEStor has not gone public ... there's no stock to trade.

In fact, a lot of the criticism being leveled at EEStor is that it is so 'unpublic' ... so secretive. And there's a lot of skepticism about whether the EESU can actually achieve the energy storage capacities claimed (or, in fact, whether any comparable capacitor can achieve such capacities).

Some patents have been granted and some product forwarded to the Underwriters Lab for testing.

However, delivery target dates keep slipping and EEStor information releases remain limited and guarded.

The stock play, BTW, on this product is indirectly via ZENN cars of Canada, who hold EESU rights for passenger cars and an equity share in EEStor.

DGDanforth said...

Just a comment about home EESU charging up your car's EESU.

An EESU is not like a gas tank. You can't pour all of the energy from it into the car. You can only pour some of it. Why?

Because of equilibrium voltage. Say you start with the home charger at voltage V and the car's voltage at zero. Now connect the charger to the car. What happens? Charge will flow into the car only until the voltage between the two EESU's is the same. Since we are assuming the two EESUs are identical and charge is conserved the equilibrium charge in the two EESUs will be the same, i.e. 1/2 the original charge of the charger. The voltage of the two EESUs will be the same, i.e. 1/2 the original voltage of the charger. BUT (and here is the kicker) the energy in the capacitor goes as the square of the voltage across the capacitor.

Conclusion: only 1/4 of the original energy in the charger is transferred to the car

AND

the car is only charged to 1/2 the voltage it could handle.