A mate called me over to his vessel on Monday to help check an odd issue with his new 500w DC wind
My turbines are 3 phase out to a rectifier, so I am a bit new to direct DC output turbines.
He picked up the turbine on his way back to Hong Kong
at the Singapore boat show
from an Australia
company that had a booth there.
His turbine has some internal MPPT
circuit that will not put out more then 31v no matter how fast the wind
is. He has a 50 amp diode in line before it connects to his battery
. He has an analogue 0-30 amp panel meter.
When I stopped over, we had gusts up to 12m/s, but the voltage output was 4v to 9v, and his amp meter showed zero all the time. He had his amp meter on the positive side. I brought with me a digital amp and volt panel meter (75mV 500A) with a matching 500A 75mV shunt.
We connected the shunt on the negative side, and connected the meter... The same readings !!!
There has to be some current
flowing, even at 9 volts... This is odd !!!
He is using 6mm wire that is about 8 meters from turbine to the battery
. I told him that perhaps 25mm2 wire would be best, and the current
is not showing due to the loss because of wire size being too small... But he still thinks there should be some amp reading no matter the wire size... I have to agree with that statement !!!
I am at a loss here !!! Any words of wisdom ???