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Dual Battery Question

 
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mike(at)vision499.com
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PostPosted: Thu Jun 30, 2022 7:47 pm    Post subject: Dual Battery Question Reply with quote

Hello

If I connect a second battery via a ground battery socket to assist my onboard battery what criteria do the 2 batteries use to determine how to split the load between themselves?

Thanks

Mike Pienaar
mike(at)vision499.com (ike(at)vision499.com)
Home: +1 250-999-8121
Mike cell: +1 250-885-0554
1-1100 Tulip Ave, Victoria, BC, V8Z 0A2


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nuckolls.bob(at)aeroelect
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PostPosted: Fri Jul 01, 2022 3:27 pm    Post subject: Dual Battery Question Reply with quote

At 10:46 PM 6/30/2022, you wrote:

Quote:
Hello



If I connect a second battery via a ground battery socket to assist my onboard battery what criteria do the 2 batteries use to determine how to split the load between themselves?


There is no reason to strive for any form of
'load sharing' . . . each battery will request/
accept charge as if it's the only battery in the
system. Similarly, each will supply energy based
on condition of chemistry, physical size, state
of charge and internal resistance totally independent
of any other battery(ies) in the system.




Bob . . .

Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"


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Voyager



Joined: 30 Jun 2020
Posts: 77

PostPosted: Fri Jul 01, 2022 5:48 pm    Post subject: Dual Battery Question Reply with quote

Internal resistance.

Sent from my iPad

Quote:
On Jul 1, 2022, at 1:42 AM, mike(at)vision499.com wrote:

 <![endif]--> <![endif]-->
Hello

If I connect a second battery via a ground battery socket to assist my onboard battery what criteria do the 2 batteries use to determine how to split the load between themselves?

Thanks

Mike Pienaar
mike(at)vision499.com (ike(at)vision499.com)
Home: +1 250-999-8121
Mike cell: +1 250-885-0554
1-1100 Tulip Ave, Victoria, BC, V8Z 0A2
 



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user9253



Joined: 28 Mar 2008
Posts: 1907
Location: Riley TWP Michigan

PostPosted: Sat Jul 02, 2022 4:57 am    Post subject: Re: Dual Battery Question Reply with quote

Another way to look at it is that an electrical load will always draw current from the source with the highest voltage.
After the voltage on one battery drops to that of the other battery, then current will be drawn from both batteries.


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Joe Gores
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nuckolls.bob(at)aeroelect
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PostPosted: Mon Jul 04, 2022 7:37 am    Post subject: Dual Battery Question Reply with quote

At 07:57 AM 7/2/2022, you wrote:
Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>

Another way to look at it is that an electrical load will always draw current from the source with the highest voltage.
After the voltage on one battery drops to that of the other battery, then current will be drawn from both batteries.

Let me hypothesize a particular condition.

Two batteries of different size are connected
in parallel. One cap-checked at 80%
of as-new capacity. I.e. ready for retirement.
The other is brand new.

Okay, put them into any system that offers
a constant voltage distribution bus set for
say 14.2 Volts (the magic number for regulator
set point for nearly 100 years). Assume independent
battery ammeters are installed.

Operate the system for time sufficient to
fully charge both batteries (recharge current
drops to an Amp or less). Now, shut off the
alternator. Leave normal system operating loads
on. Start your stopwatch. When voltage drops below
11 Volts, hit the stopwatch.

You will discover that battery only operations
track closely with energy measured as (Battery A x 0.Cool
+ (Battery B x 1.00) = total stored energy.

The two batteries have no way to know that the
other battery exists. Both will ACCEPT maximum
energy as limited by condition of their chemistry.
Both batteries will DELIVER the same energy
that was confirmed by cap-check. Whether they
'shared' the load in any pre-ordained way is
immaterial. Each will function to limits
defined by its current physical condition.
Because they're connected in parallel, they
will arrive at 11.0 volts at the same time.

This is analogous to having an airplane with
two fuel tanks of unequal size and a fuel
selector valve having a BOTH option. The
engine will run until all fuel is exhausted
irrespective of where it came from.



Bob . . .

Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"


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