The other issue with Capacitors is that the voltage goes down quickly,
and to get all the energy out you need to be able to make use of the
widely varying voltage range.
Jay
On 4/16/20 11:00 AM, Peri Hartman via EV wrote:
Ok, I did a little bit of research. Anyone care to double check this ?
Here's one for $42 at unit quantity. 1200F, max voltage 2.7V
https://www.digikey.com/product-detail/en/tecate-group/TPLH-2R7-1200SL60X74/2085-TPLH-2R7-1200SL60X74-ND/9930298
Energy is
E = 1/2 CV^2
where E is joules.
Joules to watt hours is
Wh = 0.000278 J (approx)
So,
Wh = 0.000278 * 1/2 * 1200 * 2.7^2
= 1.2 Wh
If that's correct, I'd need about 100 of these to have an operating
energy capacity of around 100Wh. (My original parameter was 150Wh for a
battery, but that included margin to ensure only charging between about
15% and 80%.)
I'll say right now that 100 caps at $40 is a non starter :)
Peri
------ Original Message ------
From: "Peri Hartman" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: 16-Apr-20 7:06:38 AM
Subject: Re[2]: [EVDL] custom battery
I'm looking at supercaps. I appreciate that a few people have
suggested this, though I don't know yet whether it could be done
economically.
Peri
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