Originally Posted by pcmm
Why would you not want to use a shunt? if the shunt is rated for 500 amps that should be fine. all your ammeter does (in reality) is measure volts. a 500amp 50mv shunt just reads 50mv by the meter (at 500amps of current
passing through the shunt) . your windlass
battery wont even notice the shunt.
The rating of the shunt tells you what the voltage drop will be, in the above case 50mv at 500amps of current draw. Shunts are pretty robust, trouble free devices and fairly low cost.
On the anchor winch
application I'm not sure that knowing the current draw is going to be very helpful anyway as it depends on the load which varies considerably when pulling an anchor
. Similar to a degree on the thruster.