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Subject: Re: Battery Checker
Date: Sun, 4 Jul 1999 14:17:54 -0400
From: Jim Cobb <cobber@ci*.co*>
To: "Sean M. Cary" <SMCARY@MI*.CO*>,
     "TECH LIST"
Sean, from my email archives:

Jesse,

being not able to locate adequate high power resistors here in a standard
electronic shop, I looked for another way to burn test the batteries.
I use 24 volt halogen bulbs, similar in design to the bulbs used in the
cave lights,  but with 150 and 250 watts. On a piece of stainless steel
there are three sockets in parallel wiring. According to the test 
situation
I use either a single 250 watt, or one 250 watt and one 150 watt , or 
three
150 watt bulbs. I can plug in two multimeters to monitor the amperage and
voltage. There is a lot of heat, so it is necessary to have the stainless
steel as a shield, and nothing inflamable should be close. 
250 watt is close to the standard Mako motor, 400 watt matches the DV100.
To check the leftover burn time on the battery after the dive, I use 450
watt to care of a partial recovery of the battery due to the time lag
between the dive and the test( only a few minutes burntime with the
leftover capacity anyway), to get a realistic number. 

Under load with 400 watt the battery starts with 24 volt, it takes approx.
45 to 50 minutes to drop to 23 volt, another 25 to 30 minutes to get  to 
22
volt, another 10 minutes  to get to 21 volts, and only 4 minutes to drop
from 21 to 20 volts, which is the end of the useful discharge. Then 
approx.
one minute to drop below 19 volts. 

This setup works also for testing leadacid and nicad batteries for cave
lights by using 12 volt 50 watt bulbs. 
----------------------------------
Maybe someone can give me a hint what works best to fasten a tekna knive
under the goodman handle. So far I have made a thread into the handle to
get the screw in. The knive could still rotate around the screw, at first 
I
used tape to fix it, but did not like it. Then I used aquaseal to fix it
into position. That looks good, but I am not sure about the durability. 
Any ideas?


Regards, Reinhard


Jesse Armantrout wrote:
>>Jody Everett had asked for this info, and it may be of use to
others...these are both originally from John Rose, I think:

Here is a copy of an old post from Casey with information about ordering
the resistors used for burn testing...........
snip<<

--- Freeattic list subscriptions/removals should be sent to
--- ken@co*.ci*.uf*.ed*.



Sender: Sean M. Cary  Date: 7/4/99 12:50 PM

>Does anyone have a schematic for a load checker?  I thougt there was one 
>on Cobbers page...but was mistaken.  I need to load check the battery of 
>my scooter.
>
>Thanks,
>
>Sean Cary
>


 -------------------------------------------------------------------
 Learn About Trimix at http://www.cisatlantic.com/trimix/trimix.html


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