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Aux Battery Idea Was: Speaking of Aux Batteries

 
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nuckolls.bob(at)aeroelect
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PostPosted: Mon Sep 09, 2019 9:08 am    Post subject: Aux Battery Idea Was: Speaking of Aux Batteries Reply with quote

Quote:

Here's a work in progress. Obviously not complete, no alternator shown, lot's of detail omitted, etc, but the starter contactor power is shown. That's the key, unless I'm missing something.

There are no 'timing' issues with using
a second battery for brownout protection.
Consider Z-35 for second battery and
simply leaving the aux battery relay
open until after the engine is running.



Bob . . .


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nuckolls.bob(at)aeroelect
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PostPosted: Tue Sep 10, 2019 5:14 am    Post subject: Aux Battery Idea Was: Speaking of Aux Batteries Reply with quote

At 03:01 PM 9/9/2019, you wrote:
Quote:
Thanks Bob,

What is the cost of accidently leaving the aux battery on during start? Is it just a sag, or does starter-sized current try to run through the small relay and associated wiring? If the main is weak, will the aux battery work that much harder? I'm concerned that a relatively simple mistake like leaving the aux batt on during start will do some damage.

(I've put switches in the wrong position before...)

Make the aux battery switch two pole
with second pole wired to disable
the starter contactor any time the aux
battery is ON.



Bob . . .


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