Wednesday, June 25. 2008
In with the new
The cells are here, with only a little shipping damage. What you see is specified to hold 15kWh, provide 46kW continuous and 153kW for a short time (how long isn't mentioned). Calculating the maximum power isn't as straightforward as multiplying the open circuit voltage by the maximum specified current, I'll post on it later.
Someone put a forklift into the side of a crate and slightly dented 3 cells and pushed the 9 behind them into the polystyrene packing on the side of the crate. I'm going to take advice on whether to bother with insurance.
Also, crazy perspective distortion!
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Specifying a current like 3C or 10C doesn't imply 3x or 10x the power delivery. You have to take into account the voltage sag under those conditions. I think you'll find that you only get 10C by shorting the cells, which tends to deliver roughly no power.
I should have known that! I have the piece of paper to prove I should know that too. I did wonder why my power numbers were so much higher than those you calculated in February. (BTW, I hadn't heard "Thévenin Equivalent" for perhaps 7 years before you brought it up).
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