ceengland7(at)gmail.com
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 Posted: Sun Jan 19, 2020 11:35 am Post subject: External socket to charge the airplane batteries |
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On 1/19/2020 12:46 PM, Carlos Trigo wrote:
| Quote: | | Quote: | Guys
In my RV-10 both batteries (main Batt - Odissey PC-925, and Aux Batt - Odissey PC-680) are in the back, inside the tail cone, behind the baggage compartment.
This is a difficult place to reach, in the completed airplane, to connect the clamps of a battery charger/maintainer.
Therefore I am going to install an external socket like this
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in the airplane skin, to be easy to connect the charger from the outside.
I am thinking in connecting both batteries to this socket through a SPDT switch, to be able to select which battery to be charged.
Now the questions:
1 - which is the current flowing through this socket when charging?
2 - consequently, which gauge of wires should be used (#1 ?
3 - should I use any fuse in this circuit? If yes, which A?
4 - is there any possibility to charge both batteries at the same time? If yes, which is the smart way to achieve that?
Thanks in advance
Carlos
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Charge current will be determined by the state of discharge of the battery, and limited by the capacity of the charger. A depleted battery connected to a 12A charger could easily draw the entire 12A available from the charger. Hook it to a 50A charger and....
Wire gauge should be determined by the voltage drop and heat rise you're willing to tolerate, within the limits of the wire/insulation.
I'd treat fusing the same way the alternator B lead is treated: size the wire for the max charger size, and fuse at the battery end to protect it from the battery.
Don't forget the risk of someone attempting to jump-start the plane using that connector. Your call on how you avoid that risk.
Switches/relays could connect both batteries for charging, but realistically, how often will you need to do that? A healthy SLA battery retains over 90% of its energy for many months without any charging whatsoever. You can learn a lot about (lack of) bench charging needs by reading Odyssey's technical docs.
Charlie
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