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Unread 30-03-2010, 08:21
Unsung FIRST Hero
Al Skierkiewicz Al Skierkiewicz is offline
Broadcast Eng/Chief Robot Inspector
AKA: Big Al WFFA 2005
FRC #0111 (WildStang)
Team Role: Engineer
 
Join Date: Jun 2001
Rookie Year: 1996
Location: Wheeling, IL
Posts: 10,792
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Re: Leaking Batterys

There was one additional item I forgot to include. All teams will at one point or another read less than 7 volts on their battery under load. This is not an indication that your producing any damage to your battery. It is just an indication that you are drawing enough current from the battery to cause a voltage drop across the internal resistance of the battery and the resistance of the wiring between the Crio and the battery. The battery internal resistance is the normally the greater of these at 11 mohms. However, loose electrical connections and improper crimps can also account for high resistance. I have seen several teams who lost the hardware for their Power Distribution Panel and substituted 1/4-20 hardware. The PD uses metric hardware so substituting the 1/4-20 prevents you from making a tight connection to the PD. 100 amps across 10 mohm=1 volt.
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Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
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Storming the Tower since 1996.