Today's Message Index:
----------------------
1. 06:33 AM - Re: EarthX battery data (Robert L. Nuckolls, III)
2. 08:12 AM - Re: New Over-Voltage Protection Architecture (user9253)
3. 08:39 AM - Re: Re: EarthX battery data (william mills)
4. 09:18 AM - Re: Re: New Over-Voltage Protection Architecture (Jeff Luckey)
5. 10:43 AM - Re: Re: New Over-Voltage Protection Architecture (Roger & Jean)
Message 1
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| Subject: | RE: EarthX battery data |
A heads-up to the List on my conversations with EarthX.
Of ALL the lithium wannabes I've approached for expanded
data on the operation and performance of their batteries,
EarthX has been the ONLY one to respond in any positive
and professional manner.
The e-mails I've forwarded to the List are conversations
with an individual in sales. I've received a data dump
from an applications person who promises to draw design
and performance talents into the conversation.
I'm not going to forward any more emails to the List
out of respect for their willingness to share what
may be considered proprietary data.
But I want to make the List aware of the fact that
EarthX seems interested in widening their customer
base on a foundation of well considered application
of their products.
I'm going to offer them assistance in crafting functional
specifications that speak purely to performance
in terms that would be appreciated by my colleagues
in TC aviation. At the same time, I will acquire
foundation for offering solid advice to the
OBAM aviation community as to suitability to
task for EarthX . . . or any other lithium
offering.
Watch this space.
Bob . . .
Bob . . .
Message 2
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| Subject: | Re: New Over-Voltage Protection Architecture |
I like Eric's idea of opening the alternator output circuit in case of too high
voltage, rather than shorting out the field. One thing to consider is, what
happens if this device fails (even if unlikely)? Of course the same question
could be asked of the crowbar type of O.V. protection.
From a pilot's perspective, it is desired to have electrical power no matter
what goes wrong, provided that the cost and weight penalties are not too great.
Some builders install a second aircraft battery, which is a huge weight penalty.
How about combining Bob's suggestion of having a backup voltage regulator with
Eric's circuit (or modified AEC/9003)? In the event of over-voltage, automatically
turn off voltage regulator number one, and at the same time, turn on voltage
regulator number two, along with a warning light. Not only would the electrical
system be protected against over-voltage, but the alternator would keep
on supplying electrical power to the aircraft.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=420616#420616
Message 3
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| Subject: | Re: RE: EarthX battery data |
Bob -
I recognized EarthX's honesty and sincerity in response to your inquiries. Their
cooperative tone is indicative of a highly principled business ethic, sadly
lacking with some (most?) vendors.
EarthX should be recognized for this.
Thank you -
Bill
SF bay area
On Mar 19, 2014, at 6:23 AM, Robert L. Nuckolls, III wrote:
>
>
>
> A heads-up to the List on my conversations with EarthX.
>
> Of ALL the lithium wannabes I've approached for expanded
> data on the operation and performance of their batteries,
> EarthX has been the ONLY one to respond in any positive
> and professional manner.
>
> The e-mails I've forwarded to the List are conversations
> with an individual in sales. I've received a data dump
> from an applications person who promises to draw design
> and performance talents into the conversation.
>
> I'm not going to forward any more emails to the List
> out of respect for their willingness to share what
> may be considered proprietary data.
>
> But I want to make the List aware of the fact that
> EarthX seems interested in widening their customer
> base on a foundation of well considered application
> of their products.
>
> I'm going to offer them assistance in crafting functional
> specifications that speak purely to performance
> in terms that would be appreciated by my colleagues
> in TC aviation. At the same time, I will acquire
> foundation for offering solid advice to the
> OBAM aviation community as to suitability to
> task for EarthX . . . or any other lithium
> offering.
>
> Watch this space.
>
> Bob . . .
>
>
> Bob . . .
>
>
>
>
>
Message 4
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| Subject: | Re: New Over-Voltage Protection Architecture |
You might be approaching a situation where "the cure is worse than the dise
ase".- You have to be careful when stacking widgets on top of gizmos in p
ursuit of greater reliability.- That approach quite often leads to greate
r complexity & lower reliability.=0A=0A=0A-Jeff=0A=0A=0A___________________
_____________=0A From: user9253 <fransew@gmail.com>=0ATo: aeroelectric-list
@matronics.com =0ASent: Wednesday, March 19, 2014 8:01 AM=0ASubject: AeroEl
ectric-List: Re: New Over-Voltage Protection Architecture=0A =0A=0A--> Aero
Electric-List message posted by: "user9253" <fransew@gmail.com>=0A=0AI like
Eric's idea of opening the alternator output circuit in case of too high v
oltage, rather than shorting out the field.- One thing to consider is, wh
at happens if this device fails (even if unlikely)?- Of course the same q
uestion could be asked of the crowbar type of O.V. protection.=0A- From a
pilot's perspective, it is desired to have electrical power no matter what
goes wrong, provided that the cost and weight penalties are not too great.
- Some builders install a second aircraft battery, which is a huge weight
penalty.=0A- How about combining Bob's suggestion of having a backup vol
tage regulator with Eric's circuit (or modified AEC/9003)?- In the event
of over-voltage, automatically turn off voltage regulator number one, and a
t the same time, turn on voltage regulator number two, along with a warning
light.- Not only would the electrical system be protected against over-v
oltage, but the alternator would keep on supplying electrical power to the
aircraft.=0AJoe=0A=0A--------=0AJoe Gores=0A=0A=0A=0A=0ARead this topic onl
ine here:=0A=0Ahttp://forums.matronics.com/viewtopic.php?p=420616#420616
=
Message 5
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| Subject: | Re: New Over-Voltage Protection Architecture |
> How about combining Bob's suggestion of having a backup voltage regulator
> with Eric's circuit (or modified AEC/9003)? In the event of over-voltage,
> automatically turn off voltage regulator number one, and at the same time,
> turn on voltage regulator number two, along with a warning light. Not
> only would the electrical system be protected against over-voltage, but
> the alternator would keep on supplying electrical power to the aircraft.
That's all well and good if the failure is the regulator!
My experience, however has been that the alternator
is several times more prone to failure than the regulator,
and this senerio will not fix a defective alternator!
Roger
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