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Sam
Joined: 18 May 2008
Posts: 135
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 Posted: Sat Oct 25, 2008 5:21 pm Post subject: Dry Cell Batteries? |
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Bob,
What would be the proper way to parallel two batteries? I am using Z19/RB
Sam
On Mon, Oct 20, 2008 at 9:39 PM, Robert L. Nuckolls, III <nuckolls.bob(at)cox.net (nuckolls.bob(at)cox.net)> wrote:
[quote]--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)cox.net (nuckolls.bob(at)cox.net)>
| Quote: | >
> What are your requirements for capacity? Have you
> done an energy study for battery-only endurance?
> The 310 is not cheap and it's fragile compared to it's
> larger siblings.
>
> Bob . . .
>
> After much discussion, we think this is how my electrically-dependent engine breaks out...
> Current draw on 4 cylinder EFI engines:
>
> Pump at 40 psi- 5-8 amps
> Injectors at 5000 rpm- 3-4 amps
> Ignition at 5000 rpm- 2.5-4 amps (depends on coil charge time)
> ECU- .15- .6 amps depending on ECU
>
> My total current draw in flight at 4500 rpm with 2 pumps on (one LP
> Facet, one HP Bosch 048), transponder, comm, gps, injectors, coils,
> ECU and scavenge pump is 18 amps.
We seem to think that the 17ah PC680 clone would give just about 15 minutes of realistic run time, given some age on the battery. I guess I might have to carry the weight of another battery around to be safe.
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According to the performance curves at:
http://tinyurl.com/5p6d4w
a 17A load on a 100% battery will give you just
under 30 minutes of run time down to about 10V. So
a battery due for replacement would be suited
for about 20 minutes of operation.
Consider running both batteries of a 2-battery
architecture in parallel. Losses in any given battery is an
I(squared)*R function. By cutting the current per
battery by about 1/2, the energy lost in each battery
drops to 1/4th the original amount. Doing 1/4
per battery in two batteries gets you 1/2 the
lost watts. Two 17 a.h. batteries gives you
34 a.h. of total capacity. An 18A load on this
combo goes to a 60+ minutes of duration.
A savings of 5 or so pounds can be realized by
going to a single 28 a.h. battery.
http://tinyurl.com/6eu2p8
The internal impedance of this battery seems
better than two 17 a.h. in parallel. It gives
you the same 60+ minutes at less weight
and total capacity.
Of course, with a single battery or treating
two batteries as one battery dictates an
aggressive capacity tracking protocol. If
ever there was an power plant begging for
a second, small alternator, it's this one.
Bob . . .
[b]
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Sam Hoskins
www.samhoskins.blogspot.com |
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mrspudandcompany(at)veriz
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| Posted: Sun Oct 26, 2008 5:45 am Post subject: Dry Cell Batteries? |
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Sam
Joined: 18 May 2008
Posts: 135
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| Posted: Sun Oct 26, 2008 6:06 am Post subject: Dry Cell Batteries? |
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Well I KNOW that!
I mean, if you have gone to the trouble to install two batteries, wouldn't you generally keep them separate, unless you were operating in the endurance mode?
Otherwise, why go to the trouble to install the engine battery bus and contactor?
Again, the model is Z19/RB
On Sun, Oct 26, 2008 at 8:41 AM, ROGER & JEAN CURTIS <mrspudandcompany(at)verizon.net (mrspudandcompany(at)verizon.net)> wrote:
[quote]
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nuckolls.bob(at)cox.net
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| Posted: Sun Oct 26, 2008 9:14 am Post subject: Dry Cell Batteries? |
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At 08:17 PM 10/25/2008 -0500, you wrote:
| Quote: | Bob,
What would be the proper way to parallel two batteries? I am using Z19/RB
Sam
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If you're paralleling two batteries for
a simple increase of capacity and reduction
of internal resistance, then just hook 'em
up.
If you have two batteries that need to be
partitioned off to separate tasks during alternator
out operations, then separate battery contactors
and busses are called for . . . precisely as
illustrated in Z-19. Those batteries are operated
in parallel when the alternator is working . . .
and separated to separate tasks when the alternator
is not working.
Bob . . .
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mjpienaar(at)shaw.ca
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| Posted: Sun Oct 26, 2008 2:04 pm Post subject: Dry Cell Batteries? |
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The "AUX BATTERY MANAGEMENT MODULE" illustrated on page 2 in the article mentioned, can I buy that or do I have to make it.
Cheers
Mike
[quote] ---
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nuckolls.bob(at)cox.net
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| Posted: Mon Oct 27, 2008 8:54 am Post subject: Dry Cell Batteries? |
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At 02:59 PM 10/26/2008 -0700, you wrote:
| Quote: | The "AUX BATTERY MANAGEMENT MODULE" illustrated on page 2 in the article
mentioned, can I buy that or do I have to make it.
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That version of the device is no longer in production. For a time
I was offering bare boards . . . so you could do your own. There's
a DIY article on the website at:
http://www.aeroelectric.com/DIY/LV_Warn_Fab_and_Install.pdf.
However, depending on how soon you need it, there's
a new product under development (we started the software
last week) intended to replace the LV_Warn/ABMM with
a LV_Warn/On_Board_Battery_Capacity Meter.
Since Z-19 cannot readily make good use of a battery
capacity meter (two batteries that need to be tracked)
then perhaps we should consider a version of the new
product that drops in to replace the LV_Warn/ABMM . . .
I'll consider that as an option.
I just checked an we're out of the bare boards and
don't plan to restock those. If you'd like to go the
DIY route, there's artwork for the boards posted
at:
http://www.aeroelectric.com/DIY/9005-301-1C_Fab.pcb
You need to download free ECB crafting and ordering
software from:
http://expresspcb.com/ExpressPCBHtm/Free_cad_software.htm
The minimum order for the boards is 3 coupons that
make 2 boards each for total of 6. This will cost
you about $61 total but perhaps you can find some
other DIY enthusiasts to share the board costs with.
Bob . . .
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