mrcc1234(at)sbcglobal.net
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 Posted: Wed May 21, 2014 4:47 pm Post subject: Aerovoltz and Starter Draw (was Z-17 Schematic) |
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The Aerovoltz is in the mail as they say and I can report the details as soon as I get it.
You probably spell out how to build the cap check curves in your book so I will look into that.
Good to know that 4awg should be sufficient at least that saves a little weight. I was having trouble figuring out how much current to assume was being drawn during a cold start to base the wire size calc on.
Thanks,
Matt
| Quote: | At 09:33 PM 5/20/2014, you wrote:
> <mrcc1234(at)sbcglobal.net>
>
> Thanks for your responses Bob,
>
> I have purchased an Aerovolts 12 cell lithium battery to give a try. It is
> billed as the choice for cranking an O-200 and is 4.4"x3.4"x4" and 2.5 lbs.
Hmmmm . . . I'd sure like to do a family of
cap check curves on it . . .
I've looked over their website. They seem to offer
a 'special charger' for 'improved life' but also
says 'no special charger necessary'.
Did any paperwork come with the battery that
cautions about deep discharge and/or making sure
the bus voltage is not too high?
> I am shooting for an aft installation and as you said that will let me keep
> my heavy wires short. I would like to put it in the main spar, but not sure
> about drilling holes in it to run the wires out or for mounting the battery.
> If that does not work I am looking at the hell hole above the landing gear
> attachment.
>
> If the aft locations prove more trouble than they are worth than I am
> looking at the traditional battery spot in the nose and 2AWG wires. It warm
> most of the time here near Houston, but we do get a week or two worth of
> almost cold weather.
4AWG is about 300 micro-ohms per foot WARM (160F
from cranking). Assuming 24' round trip, a 200A
cranking current will toss off 1.44 volts in the
wire. 2AWG is 200 micro-ohms per foot and wouldn't
warm up as much . . . so figure about 0.9 volts
in wire drop for a net savings of about 0.5 volts
out of a total of 9-10 volts at the starter motor
terminals. 4AWG would probably be fine.
Bob . . .
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