Today's Message Index:
----------------------
1. 10:49 AM - External socket to charge the airplane batteries (Carlos Trigo)
2. 11:35 AM - Re: External socket to charge the airplane batteries (Charlie England)
3. 01:18 PM - Re: External socket to charge the airplane batteries (Robert L. Nuckolls, III)
4. 02:29 PM - Re: External socket to charge the airplane batteries (Sebastien)
Message 1
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| Subject: | External socket to charge the airplane batteries |
Guys
In my RV-10 both batteries (main Batt - Odissey PC-925, and Aux Batt - Odiss
ey PC-680) are in the back, inside the tail cone, behind the baggage compart
ment.
This is a difficult place to reach, in the completed airplane, to connect th
e clamps of a battery charger/maintainer.
Therefore I am going to install an external socket like this
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 swi
tch, 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 (#18)?
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
Message 2
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| Subject: | Re: External socket to charge the airplane batteries |
On 1/19/2020 12:46 PM, Carlos Trigo wrote:
> 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
>
>
> 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 (#18)?
> 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
>
>
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
Message 3
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| Subject: | Re: External socket to charge the airplane batteries |
At 12:46 PM 1/19/2020, you wrote:
>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
>in the airplane skin, to be easy to connect the charger from the outside.
That's an AC power connector . . . not polarized.
No feature to prevent reversed connection.
This is not a very environmentally robust
device either.
Is your airplane hangared? How about putting
a goof-proof connector just inside the baggage
compartment . . . leave door ajar and plug in
shore-power. Connector stays out of weather.
>I am thinking in connecting both batteries to this socket through a
>SPDT switch, to be able to select which battery to be charged.
What kind of charger?
>Now the questions:
> 1 - which is the current flowing through this socket when charging?
Depends on charger.
> 2 - consequently, which gauge of wires should be used (#18)?
> 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?
The only time you need to CHARGE a battery
is if you parked the airplane in a less-than-
full state of charge. The only time you need
to plug-in is if the airplane is going to be
parked for an extended period of time.
You don't need a switch, there's a way
to wire a 3-terminal connector to effect
battery paralleling for the purpose of
MAINTAINING. But if you anticipate a need
to CHARGE less than topped-off batteries,
then we need to discuss the brand/model
of charger.
Have you published a power distribution
diagram. How are these batteries wired
and controlled?
Bob . . .
Message 4
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| Subject: | Re: External socket to charge the airplane batteries |
Carlos I think your plan is way too complicated. My RV-10 has a fuse
protected battery charging cord connected to each battery and going to the
baggage compartment. If I want to charge that battery, I open the baggage
door and plug into that battery. No external door, no switch.
First select and purchase the charger. With many chargers you can
disconnect the alligator clips and there is some sort of plug. Use the same
plug on the end of the battery cable. My charger came with one free battery
cable, the second one was $10. Many of these chargers use 2 prong
automotive plugs which are cheap and available everywhere.
On Sun, Jan 19, 2020 at 1:24 PM Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 12:46 PM 1/19/2020, you wrote:
>
> 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
>
>
> in the airplane skin, to be easy to connect the charger from the outside.
>
>
> That's an AC power connector . . . not polarized.
> No feature to prevent reversed connection.
> This is not a very environmentally robust
> device either.
>
> Is your airplane hangared? How about putting
> a goof-proof connector just inside the baggage
> compartment . . . leave door ajar and plug in
> shore-power. Connector stays out of weather.
>
>
> I am thinking in connecting both batteries to this socket through a SPDT
> switch, to be able to select which battery to be charged.
>
>
> What kind of charger?
>
>
> Now the questions:
> 1 - which is the current flowing through this socket when charging?
>
>
> Depends on charger.
>
> 2 - consequently, which gauge of wires should be used (#18)?
> 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?
>
>
> The only time you need to CHARGE a battery
> is if you parked the airplane in a less-than-
> full state of charge. The only time you need
> to plug-in is if the airplane is going to be
> parked for an extended period of time.
>
> You don't need a switch, there's a way
> to wire a 3-terminal connector to effect
> battery paralleling for the purpose of
> MAINTAINING. But if you anticipate a need
> to CHARGE less than topped-off batteries,
> then we need to discuss the brand/model
> of charger.
>
> Have you published a power distribution
> diagram. How are these batteries wired
> and controlled?
>
> Bob . . .
>
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