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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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 Posted: Mon Oct 30, 2006 1:08 pm Post subject: Basic Battery Wiring |
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The battery relay is a good idea if you want to have a master switch to
isolate the Battery encase of a problem. You can add a generator switch (
lower amperage ) to stop power form the generator in case of a short some
where in the panel.
I recommend if possible build a buss bar and have your circuit breakers
attached directly to the buss bar. That way any short circuit will almost
have to be down stream of the circuit breaker. I usually wire master
switches to activate the solenoid when the switch is closed to ground. That
removes the necessity of a hot wire going from the battery to the master
switch and returning to the solenoid. With that type of set up there are
more places for a short circuit to occur.
Noel
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Mon Oct 30, 2006 2:08 pm Post subject: Basic Battery Wiring |
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Move your starter solenoid back beside the battery. That way the only time
the heavy cable is energized is when the starter is engaged.
Noel
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Mon Oct 30, 2006 2:22 pm Post subject: Basic Battery Wiring |
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A Rose by any other name is not altogether accurate... Come to think of it
NOT!
A Master contactor is designed to operate energized in the closed position
for hours and hours without over heating.
An energized starter solenoid will begin to overheat within five minutes and
becomes dangerous.
To add protection to these lines I recommend placing both solenoids as close
to the battery as feasible. The master solenoid I usually wire so the
master switch completes a ground. The starter solenoid as has been
discussed here will usually energize from the master buss. The line from
the starter switch to the solenoid being dead in flight and energized only
to start the engine.
If you are looking for non certified Master solenoids try looking at
trailer or RV parts shops. The master contactor type solenoid is used to
isolate batteries ( hence a battery isolation solenoid )when the engine is
off in an RV and will energize the line to charge the second battery when
the engine is running.
Noel
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Noel Loveys
Kitfox III-A
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craig(at)craigandjean.com
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| Posted: Mon Oct 30, 2006 2:34 pm Post subject: Basic Battery Wiring |
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B&C is a good source of master and starter contactors (along with many other
electrical parts cited in the AeroElectric Connection):
http://www.bandc.biz/
-- Craig
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Mon Oct 30, 2006 2:39 pm Post subject: Basic Battery Wiring |
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PVC not only burns like flint but also produces toxic fumes!
Having both the master solenoid and the starter solenoid next to the battery means you can isolate all power coming from the battery in case of a short.
Noel [quote]
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Noel Loveys
Kitfox III-A
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Tue Oct 31, 2006 7:58 am Post subject: Basic Battery Wiring |
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I have mine set up just like yours, the battery is behind the passenger
seat with the master relay right beside it. The starter current passes
through the master on the way to the starter. I've had no trouble with
it for 2 years and 175 hours of flight time. most of the wiring diagrams
i have seen have this configuration. As for putting the starter relay
back behind the seat with the master, that isn't practical since my
starter relay is built in to my starter.
doug kandle wrote:
| Quote: |
Craig:
My battery is behind my seat, 6 feet or so aft of the firewall. I don't want any uncontrolled heavy wire to go from the battery area to the firewall (to limit the amount of cable that can cause me real problems if it shorts out). So, I want my master solenoid to be right next to the battery. If I connect my starter to the battery, without passing through the master solenoid, then I would have to run an uncontrolled heavy wire from the battery to the engine this would completely negate any advantage of having the solenoid next to the battery.
In a forced landing you turn off the master so that there will be less chance of any sparks starting a fire. I want all of the electrical system possible to be inert if I ever have to do a forced landing.
I just double checked the drawings for my Cessna 206 and it passes the starter current through both contactors. Since the part I am using is identical (I believe) to the one in my Cessna, it should be able to handle the current.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=71007#71007
Bryan Martin
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Ram Subaru/ Stratus redrive
CH601XL N61BM
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Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
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