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DPDT Toggle switch for BAT and 2 Alternators?

 
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nuckolls.bob(at)aeroelect
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PostPosted: Thu Aug 23, 2018 10:05 am    Post subject: DPDT Toggle switch for BAT and 2 Alternators? Reply with quote

At 12:28 PM 8/23/2018, you wrote:
Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>

One overlooked problem is the $72 cost of the switch plus shipping.

It's also a single point of failure for lots
of stuff.



Bob . . .


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nuckolls.bob(at)aeroelect
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PostPosted: Thu Aug 23, 2018 3:20 pm    Post subject: DPDT Toggle switch for BAT and 2 Alternators? Reply with quote

At 11:49 AM 8/23/2018, you wrote:
Quote:
--> AeroElectric-List message posted by: "supik" <bionicad(at)hotmail.com>

To keep things simple I was thinking about using the Honeywell DPDT on/on/on toggle switch for switching on BAT + Alternator 1 & Alternator 2 (aux alt) at the same time. The design would include one main battery and the IBBS standby bat.

Really wish you wouldn't do that. Suggest you take
one of the Z-figures and identify features that do
not meet your design goals . . . then get with the
gurus here on the List to sort out your options.

Unless you've been doing this for a long time, there's
significant risk that 'simplifications' move your
risk factors in the wrong direction.



Bob . . .


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supik



Joined: 22 Aug 2018
Posts: 2

PostPosted: Sat Aug 25, 2018 10:51 pm    Post subject: Re: DPDT Toggle switch for BAT and 2 Alternators? Reply with quote

[quote="nuckolls.bob(at)aeroelect"]At 11:49 AM 8/23/2018, you wrote:
Quote:
--> AeroElectric-List message posted by: "supik" <bionicad>

Unless you've been doing this for a long time, there's
significant risk that 'simplifications' move your
risk factors in the wrong direction.



Bob . . .


Bob, that's the reason why I am asking here. I was looking at the Z figures, but haven't found a combo I was looking for:

1 Main bat
1 IBBS backup bat
2 Alternators

..and the option that none of the Alts can be selected ON unless the Bat is ON. With BAT ON, separate selection of Alternators shall be possible.

thanks,


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Igor

RV10 in progress
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nuckolls.bob(at)aeroelect
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PostPosted: Sun Aug 26, 2018 12:02 pm    Post subject: DPDT Toggle switch for BAT and 2 Alternators? Reply with quote

Quote:
Bob, that's the reason why I am asking here. I was looking at the Z figures, but haven't found a combo I was looking for:

1 Main bat
1 IBBS backup bat
2 Alternators

..and the option that none of the Alts can be selected ON unless the Bat is ON. With BAT ON, separate selection of Alternators shall be possible.

Don't like to put control of so many electro-whizzies
on one switch. Z-13/8 is one of several examples where
you can loose functionality of any one component with
a high order probability of comfortable termination
of flight.

What's the IBBS battery? What is it about battery
reliability that drives you to believe that loosing
the main battery is a untenable risk?

Batteries ARE a bit of a pain . . . they are like potted
plants. Given the same attention you would give to tire
wear, belt wear, prop nicks, torque on wooden prop bolts,
oil changes, plug maintenance, the battery is the single
most reliable source of energy in the airplane. But like
the house plant, abuse it beyond certain bounds just
once can seriously degrade its integrity.

If you have no plans for optimally maintaining the ship's
main battery, then will a standby battery be treated any
differently? Stacking two, poorly maintained batteries
on top of each others only increases weight and doubles
the chances that you're going to come up short on
stored electrons due to flagging battery performance . . .
a condition easily avoided.

What is it about Z13/8 as published that gives you
heart burn?


Bob . . .


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user9253



Joined: 28 Mar 2008
Posts: 1326
Location: Riley TWP Michigan

PostPosted: Sun Aug 26, 2018 3:22 pm    Post subject: Re: DPDT Toggle switch for BAT and 2 Alternators? Reply with quote

IBBS is a small Lithium battery.
http://www.tcwtech.com/ibbs_integrated_backup_battery_system_3ah_6ah.html


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nuckolls.bob(at)aeroelect
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PostPosted: Mon Aug 27, 2018 3:13 pm    Post subject: DPDT Toggle switch for BAT and 2 Alternators? Reply with quote

At 06:22 PM 8/26/2018, you wrote:
Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>

IBBS is a small Lithium battery.
http://www.tcwtech.com/ibbs_integrated_backup_battery_system_3ah_6ah.html

--------
Joe Gores

Okay, thanks. I just downloaded the patent on the
ibbs (8,189,305) along with 'related patents' citen
on their website. I wonder if the circuitry in their
patent truly represents the product . . . it's
REALLY busy! The patent is pretty long in the
tooth . . . and much simpler approaches
to a similar product are on the market.

Okay, installation instructions do include
YEARLY checks for continued air worthiness.
I presume one would check the chip's battery
at the same time . . . which means the operator
needs to develop his/her own airworthiness
verification protocols.

Igor, what size IBBS are you installing
and have you established your projected loads
and design goals for endurance?





Bob . . .


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trigo(at)mail.telepac.pt
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PostPosted: Thu Aug 30, 2018 10:57 am    Post subject: DPDT Toggle switch for BAT and 2 Alternators? Reply with quote

Bob

The man behind the IBBS and all other TcwTech products is an RV-10 builder, so perhaps he will chime in.

Carlos


De: owner-aeroelectric-list-server(at)matronics.com <owner-aeroelectric-list-server(at)matronics.com> Em nome de Robert L. Nuckolls, III
Enviada: Tuesday, August 28, 2018 12:12 AM
Para: aeroelectric-list(at)matronics.com
Assunto: Re: Re: DPDT Toggle switch for BAT and 2 Alternators?

At 06:22 PM 8/26/2018, you wrote:

Quote:

--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>

IBBS is a small Lithium battery.
http://www.tcwtech.com/ibbs_integrated_backup_battery_system_3ah_6ah.html

--------
Joe Gores


Okay, thanks. I just downloaded the patent on the
ibbs (8,189,305) along with 'related patents' citen
on their website. I wonder if the circuitry in their
patent truly represents the product . . . it's
REALLY busy! The patent is pretty long in the
tooth . . . and much simpler approaches
to a similar product are on the market.

Okay, installation instructions do include
YEARLY checks for continued air worthiness.
I presume one would check the chip's battery
at the same time . . . which means the operator
needs to develop his/her own airworthiness
verification protocols.

Igor, what size IBBS are you installing
and have you established your projected loads
and design goals for endurance?




Bob . . .


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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
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