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rshannon
Joined: 05 Sep 2007
Posts: 62
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 Posted: Sat Jun 14, 2008 11:24 am Post subject: aux battery current |
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I'm pondering sizing of the wire from a small AUX BAT to the battery bus. The small AUX BAT would only be intended to extend battery life on the E-bus, and/or to add juice for a few things on the main bus (landing lights, etc.) For example, when a low voltage condition occurs (alternator failure) and the AUTO mode of the AUX BAT mgmt. module turns the AUX BAT relay OFF, how much current flow can be expected from a small AUX BAT to the battery bus if/when the AUX BAT relay is manually switched ON later in the flight?
The answer probably depends on the state of charge of the main battery at the time, but... is it possible to estimate a range of current that could be expected out of the AUX BAT as the two batteries are switched into parallel? Would any surge be sufficiently short term that a 10 or 12 AWG would suffice?
Ron
[quote][b]
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rshannon
Joined: 05 Sep 2007
Posts: 62
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| Posted: Sat Jun 14, 2008 1:58 pm Post subject: aux battery current |
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For example, if when the AUX BAT is turned ON there's a 1 volt differential between AUX BAT and battery bus, would the initial current flow from AUX BAT to the battery bus be a function of the voltage differential and the internal resistance of the main battery, plus the current load of whatever devices were in use?
Ron
On Sat, Jun 14, 2008 at 12:20 PM, Ron Shannon <rshannon(at)cruzcom.com (rshannon(at)cruzcom.com)> wrote:
[quote] I'm pondering sizing of the wire from a small AUX BAT to the battery bus. The small AUX BAT would only be intended to extend battery life on the E-bus, and/or to add juice for a few things on the main bus (landing lights, etc.) For example, when a low voltage condition occurs (alternator failure) and the AUTO mode of the AUX BAT mgmt. module turns the AUX BAT relay OFF, how much current flow can be expected from a small AUX BAT to the battery bus if/when the AUX BAT relay is manually switched ON later in the flight?
The answer probably depends on the state of charge of the main battery at the time, but... is it possible to estimate a range of current that could be expected out of the AUX BAT as the two batteries are switched into parallel? Would any surge be sufficiently short term that a 10 or 12 AWG would suffice?
Ron
[b]
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