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Battery Back up...

 
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nickc(at)mtaonline.net
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PostPosted: Tue Feb 12, 2019 5:37 pm    Post subject: Battery Back up... Reply with quote

Charle and Kolbers,

An A&P from whom I was renting hanger space last year, thought it would be good to have a back up power source for the fuel injection and ignition…if things when bad, I could I can flip a switch and change the power source…. hopefully giving me time to land somewhere safe.

Nick Cassara
Palmer, AK

Kolbra 607AK


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ceengland7(at)gmail.com
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PostPosted: Tue Feb 12, 2019 8:17 pm    Post subject: Battery Back up... Reply with quote

On 2/12/2019 7:35 PM, Nick Cassara wrote:
Quote:


Charle and Kolbers,

An A&P from whom I was renting hanger space last year, thought it would be good to have a back up power source for the fuel injection and ignition…if things when bad, I could I can flip a switch and change the power source…. hopefully giving me time to land somewhere safe.

Nick Cassara
Palmer, AK

Kolbra 607AK

If you're electrically dependent, he's right, at least in theory.


I'm currently working on an electrically dependent engine (Mazda rotary)
in an RV-7, & have friends who have been flying rotaries for years. Most
of the guys I know are flying with a single alternator and single SLA
battery (PC680 or similar), though a few have more elaborate systems
with dual alts and/or dual batteries.

The battery & alternator can be considered redundant power sources,
unless total current requirements to stay in the air severely limit
endurance on the battery (a working alternator has unlimited endurance).

You can create a 'third layer' with a 2nd battery, kept charged through
a Schottky diode, and only connected to your engine bus if you activate
the 'panic' switch. The Schottky will only have about a half volt drop
at most, once the battery is close to topped off, so it will always be
fully charged as long as the alternator voltage is set above 14V. Lots
cheaper than the TCW, and capacity can be whatever you want/need.

If you're interested, we can go further with it.

Charlie

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