age drop, will the additional thruster output
be noticeably better? Mike Rzonca
JOHN ADEY: Motors put out what they’re
supposed to when they get the right voltage.
So, if the thruster is sized correctly for the
boat (verify that based on specs), then you’ll
notice improved performance. Imagine your
car starter at 8. 6 volts (basically the same
motor). Do you think it would rapidly turn
your car over? Based on your statements, the
wire size may be the problem, or possibly
the connections. These can be a significant
cause of voltage drop. Check each connection and quality of the crimp/fitting. You can
even use an infrared thermometer to check
the temperature of the connections while the
thruster is engaged. Remember, heat means
resistance. So if one connection is much hotter than another, check it out.
A second bank is a common choice if you
have the room (a ventilated area suitable for batteries) and the charging capacity. This would allow you to keep the existing wire, but with
a shortened run. However, it will probably cost more in batteries than
replacing the too-small wire. The install you have is just on the edge
of being acceptable. Getting to 10-11 volts is going to be a
The cross section of wire
for every three-gauge decrease
which also cuts
the resistance of that
wire in half.
wire has less
than half the
and so on.
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