How long must I run the engine to re-charge the TM battery between fishing spots?
A It depends on two things, the amount of current the TM draws and the amount of charging current the main motor puts out. You may have to just guess these numbers based on the specifications of the TM and alternator if you don’t have any way of measuring them. Estimate the average current while trolling and multiply this by the time you spend trolling in hours and that equals the amp-hours used. For example if it draws an average of 15 amps and you fish for 45 minutes that comes to 15×45/60 = 11.25 amp-hours. Then divide this by the number of amps the alternator is rated for to get the running time needed between fishing spots to fully recharge – for example if it is rated at 20 amps output you have to run the motor for 11.25/20 = .56 hours or about 36 minutes between fishing spots to FULLY recharge. These numbers were made up out of the blue sky so you need to figure in something like what you have. The running time to replace the charge calculated using this method is actually not l
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