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richard(at)RILEY.NET
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 Posted: Sun Mar 12, 2006 2:42 pm Post subject: Battery for ultralight aircraft |
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I'm finishing an ultralight with a Zenoah G25 2 stroke engine - about
22 hp. It came with a 12V electric starting system. When asked what
kind of battery was recommended, the distributor replied "oh, just
about any 3 or 4 amp." I assume that's amp hours, and bought a
sealed lead acid 3.5 A/H at the local electronics shop.
It doesn't turn the engine over. When freshly charged, voltage drops
to 4.3 while cranking. So, I figure I need another.
The configuration of the airframe makes it desirable for one
dimension - length or width, depending on how you look at it - to be
about 2". So I was looking at this one http://tinyurl.com/p3htu
Is there any way to tell if it has a reasonable peak cranking
output? Or, does anyone have a suggestion for another battery in
that size range?
TIA
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brian
Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA
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| Posted: Sun Mar 12, 2006 3:24 pm Post subject: Battery for ultralight aircraft |
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Richard Riley wrote:
| Quote: |
I'm finishing an ultralight with a Zenoah G25 2 stroke engine - about
22 hp. It came with a 12V electric starting system. When asked what
kind of battery was recommended, the distributor replied "oh, just
about any 3 or 4 amp." I assume that's amp hours, and bought a
sealed lead acid 3.5 A/H at the local electronics shop.
It doesn't turn the engine over. When freshly charged, voltage drops
to 4.3 while cranking. So, I figure I need another.
|
You do need something larger. Make sure the one you get is an AGM
battery rather than a gel-cell. AGMs have much lower internal resistance
and will not exhibit the voltage drop when heavily loaded like a
gel-cell will.
--
Brian Lloyd 361 Catterline Way
brian-yak at lloyd dot com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery
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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery |
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brian
Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA
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| Posted: Sun Mar 12, 2006 3:25 pm Post subject: Battery for ultralight aircraft |
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Richard Riley wrote:
| Quote: | The configuration of the airframe makes it desirable for one
dimension - length or width, depending on how you look at it - to be
about 2". So I was looking at this one http://tinyurl.com/p3htu
|
Ah, I see that it is an AGM battery. It may work. It is still pretty
small tho'.
--
Brian Lloyd 361 Catterline Way
brian-yak at lloyd dot com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery |
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nuckollsr(at)cox.net
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| Posted: Sun Mar 12, 2006 4:55 pm Post subject: Battery for ultralight aircraft |
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At 03:24 PM 3/12/2006 -0800, you wrote:
| Quote: |
Richard Riley wrote:
>
>
> I'm finishing an ultralight with a Zenoah G25 2 stroke engine - about
> 22 hp. It came with a 12V electric starting system. When asked what
> kind of battery was recommended, the distributor replied "oh, just
> about any 3 or 4 amp." I assume that's amp hours, and bought a
> sealed lead acid 3.5 A/H at the local electronics shop.
>
> It doesn't turn the engine over. When freshly charged, voltage drops
> to 4.3 while cranking. So, I figure I need another.
You do need something larger. Make sure the one you get is an AGM
battery rather than a gel-cell. AGMs have much lower internal resistance
and will not exhibit the voltage drop when heavily loaded like a
gel-cell will.
|
Another thing to look for is real TERMINALS that you can
bolt wires to. The skinny tabs for fast-on terminals are
not suitable for cranking currents. Unfortunately, folks
who built smaller batteries capable of cranking engines
generally don't install anything larger than fast-on tabs.
The smallest batteries I'm aware of that have treaded
terminals are:
http://www.bandc.biz/BC103-1.pdf
and the Odyssey PC310/PC535 described at:
http://www.enersysreservepower.com/documents/US-ODY-RS-002_0805.pdf
Bob . . .
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ceengland(at)bellsouth.ne
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| Posted: Sun Mar 12, 2006 6:45 pm Post subject: Battery for ultralight aircraft |
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Brian Lloyd wrote:
| Quote: |
Richard Riley wrote:
>The configuration of the airframe makes it desirable for one
>dimension - length or width, depending on how you look at it - to be
>about 2". So I was looking at this one http://tinyurl.com/p3htu
>
>
Ah, I see that it is an AGM battery. It may work. It is still pretty
small tho'.
What kind of terminals? The smaller batteries usually have 1/4" spade
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lugs. If this one does, it might have a bit of a problem delivering
enough current through the terminals even if the battery's internal
impedance is low enough to supply starting current.
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