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recapen(at)earthlink.net
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 Posted: Wed Nov 21, 2007 5:03 am Post subject: Running avionics on power supply |
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No replies to my initial post, so trying again....
Should there be any issues in running my electrical system with a power supply instead of the alternater/engine running? I have a battery in the circuit (PC680).
Do I need to connect the power supply directly to the battery or can I hook it to my shunt to simulate the power coming from the alternator?
Just want to make sure that I don't fry anything.....
Ralph Capen
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JOHN TIPTON
Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England
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| Posted: Wed Nov 21, 2007 5:54 am Post subject: Running avionics on power supply |
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Likewise: I have a CB power supply (13.8v 3amp) which I thought of using to
power up the system - to the vacant battery terminal or where?
John
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mwcreek(at)frontiernet.ne
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| Posted: Wed Nov 21, 2007 10:05 am Post subject: Running avionics on power supply |
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FWIW,
I've been powering my pannel from a PC680 with a battery charger
connected to it and have not had any problems. The charger output
voltage was fluctuating (or I had bad connections) when I powered
directly from it so using the battery as a sink made it work just
fine. The follwing equipment is being powered this way:
GRT Sport
SL30
GTX327
GRT EIS
TT AP
PSE 3000
Hope this helps,
Mike
Quoting JOHN TIPTON <jmtipton(at)btopenworld.com>:
[quote]
<jmtipton(at)btopenworld.com>
Likewise: I have a CB power supply (13.8v 3amp) which I thought of
using to power up the system - to the vacant battery terminal or where?
John
---
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recapen(at)earthlink.net
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| Posted: Wed Nov 21, 2007 10:49 am Post subject: Running avionics on power supply |
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Your charger is connected directly to the battery?
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mwcreek(at)frontiernet.ne
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| Posted: Wed Nov 21, 2007 12:11 pm Post subject: Running avionics on power supply |
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yes, the battery charger is connected directly to the battery.
Quoting "Ralph E. Capen" <recapen(at)earthlink.net>:
[quote]
<recapen(at)earthlink.net>
Your charger is connected directly to the battery?
--
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nuckolls.bob(at)cox.net
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| Posted: Wed Nov 21, 2007 8:58 pm Post subject: Running avionics on power supply |
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At 07:56 AM 11/21/2007 -0500, you wrote:
| Quote: |
<recapen(at)earthlink.net>
No replies to my initial post, so trying again....
Should there be any issues in running my electrical system with a power
supply instead of the alternater/engine running? I have a battery in the
circuit (PC680).
Do I need to connect the power supply directly to the battery or can I
hook it to my shunt to simulate the power coming from the alternator?
Just want to make sure that I don't fry anything.....
|
Some years ago I sold a 13.8 volt, 25A switchmode
power supply along with instructions on how to wire
it to the aircraft such that it emulated the ship's
alternator. This allowed a builder to fire up all but
the heaviest loads on the electrical system and to
exercise all the systems just as if the engine were
running and the alternator was turned ON.
If you have a well behaved power supply (13.8 volts
preferred, current limited against accidental shorts)
then you can basically hook it up about anywhere. Across
the battery is fine. This makes the battery master
capable of disconnecting your supply from system by
turning the battery master OFF.
See:
http://www.mpja.com/prodinfo.asp?number=5386+PS
also, the various smart-chargers with more robust
outputs like those shown on pages 6 and 7 of:
http://www.schumacherproducts.com/assets/pdf/sec_catalog.pdf
can be used. Again, just connect across the battery,
plug into wall and use the battery master for
control.
Wall-Mart sells several of these models. Get one
with 10A or more capability.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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echristley(at)nc.rr.com
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| Posted: Thu Nov 22, 2007 8:04 am Post subject: Running avionics on power supply |
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JOHN TIPTON wrote:
| Quote: |
<jmtipton(at)btopenworld.com>
Likewise: I have a CB power supply (13.8v 3amp) which I thought of
using to power up the system - to the vacant battery terminal or where?
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I've been using a surplus computer power supply to test my installation.
The yellow wires are a very well regulated 12V. The blue wire has to be
tied to one of the black wires. Black is ground. It will only deliver
a few amps, and will shut itself down if overloaded, which I consider a
feature since it will keep me from frying anything in many cases.
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