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1. 12:09 AM - Re: External start battery (Jorgen Nielsen)
2. 03:07 AM - Re: External start battery (Colyergreg)
Message 1
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| Subject: | External start battery |
OK an update. I spoke with a battery manufacturer here in SA, and went
through all kinds of options to try get a battery based 28V system for
external ground start.
We even played with some off the wall ideas such as building me a one off
car type battery but with only 2 cells connected, not the normal 6, to give
4V.
What we have settled on is using 2 big car type batteries to give 24V. In
addition, I will use two 2V batteries as well to boost the voltage up to
28V.
These 2V batteries are rated at 186Ah capacity, can deliver more than enough
current. 20 years life. They normally used here in SA in mining
locomotives.
I have a programmable charger that can deliver 5A, and I can set it for 4V.
When I make up the unit I will tap off some charge plugs for 24V and 4V to
make it easy to charge.
I will let you all know how it all works out.
On another note: I have been using a 24V charger for some time, to charge
my normal 24V ground start batteries and also to top up the onboard
batteries. I battled to find a 24V charger initially, than had a bright
idea and bought a fully electronic version from a electric scooter supplier.
Been working well so far.
Regards to all on the list.
Jorgen Nielsen
Message 2
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| Subject: | Re: External start battery |
Sounds like you figured it out, now let see how it works.
Sent from my iPhone,
Greg
On Feb 27, 2009, at 12:04 AM, "Jorgen Nielsen" <jorgen.nielsen@mweb.co.za
> wrote:
> OK an update. I spoke with a battery manufacturer here in SA, and
> went through all kinds of options to try get a battery based 28V
> system for external ground start.
>
>
> We even played with some off the wall ideas such as building me a
> one off car type battery but with only 2 cells connected, not the
> normal 6, to give 4V.
>
>
> What we have settled on is using 2 big car type batteries to give
> 24V. In addition, I will use two 2V batteries as well to boost the
> voltage up to 28V.
>
>
> These 2V batteries are rated at 186Ah capacity, can deliver more
> than enough current. 20 years life. They normally used here in SA
> in mining locomotives.
>
>
> I have a programmable charger that can deliver 5A, and I can set it
> for 4V. When I make up the unit I will tap off some charge plugs
> for 24V and 4V to make it easy to charge.
>
>
> I will let you all know how it all works out.
>
>
> On another note: I have been using a 24V charger for some time, to
> charge my normal 24V ground start batteries and also to top up the
> onboard batteries. I battled to find a 24V charger initially, than
> had a bright idea and bought a fully electronic version from a
> electric scooter supplier. Been working well so far.
>
>
> Regards to all on the list.
>
>
> Jorgen Nielsen
>
>
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