Re: (ET) Power connector for 36 volt external battery

["David Roden" <etpost drmm net>]

On 1 Apr 2014 at 20:47, CZ Unit wrote:

> However most times the
> tractor is pulling <100 amps so a 30a connector on the third string of
> batteries should be fine.

Not necessarily.  You don't know how the current will divide among the 
paralleled batteries.  If the internal resistance of those aircraft 
batteries is 1/10 that of the lead batteries, they might well be providing 
90% of the current until they discharge enough that their terminal voltage 
falls below the voltage of the lead batteries.

If your tractor needs 100a, use a connector rated for at least that much.  
I'd go for 150a for a safety margin.


David Roden - Akron, Ohio, USA

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