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1. 06:39 AM - Re: Re: Anything 'unique' about incorporating EarthX? (Robert L. Nuckolls, III)
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| Subject: | Re: Anything 'unique' about incorporating EarthX? |
At 01:00 PM 8/24/2015, you wrote:
> "With a B&C overvoltage protection module (nominal trip voltage of
> 16.2 volts), I could have voltage to the battery greater than the
> BMS triiger voltage and have loss of battery power supply at the
> same time I have no alternator electrical source!"
>
> I just talked with Kathy at EarthX and mentioned this concern
> with the OV protection. I am very near making the decision on
> batteries to use on my project also using the B and C regulator
> so was very interested in this. She strongly recommended to use one
> of the new aircraft specific battery designs, ETX680, ETX900,
> or ETX1200, and that these batteries have the OV protection set at
> over 19V in order to address this very issue. She said new
> batteries also have greater redundancy and battery fault
> warning than their other batteries.
19 volts? Hmmm . . . wonder how they arrived at
that figure . . . which seems to argue with some
widely circulated 'never exceed' numbers that
are reputed to trash the battery.
It will be interesting to see how the return on investment shakes out for
this new direction in battery technologies. When you're selling Apple
products, there's a market segment that can be depended on to 'need'
whatever new features are offered. That market is a classic demonstration
of "Build it and they will come". A market with little incentive to deduce
what features really improve performance and/or reduce risk.
Speaking of great experiments in "Build it an they will come",
there are many thousands of housing and commercial units built
and supposedly move-in ready. Multiple complete cities standing empty in
another part of the world . . .
Emacs!
. . . again, a powerful demonstration that encourage folks
to understand the economics . . . the return on investment for
needs versus wants. I am still mystified as to how it's a
'good thing' to add a wad of transistors to a battery just
to achieve a few pounds of weight savings . . . we'll just
have to wait and see.
Bob . . .
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