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measuring current/amps on a shunt


AMK Nov 29, 2018 12:38 PM

Hello Forum,

We just installed a small wind turbine at a remote data collection site. We'd like to quantify how effective the wind turbine is at generating power for a future proposal. Can anyone comment on the hardware needed to perform this? We'd like to use a CR1000 with a network module for real-time monitoring. Thanks again.

AMK


JDavis Nov 29, 2018 03:04 PM

If the power you need to measure is AC, you need a current transformer and a potential transformer. The datalogger has an ACPower instruction for the purpose.

If the power is DC, you can measure it with a current shunt, wired on the low side, and a voltage divider. DC wattage is simply current times voltage.


AMK Nov 29, 2018 04:01 PM

@jdavis, thank you! It is a DC system. You wouldn't have a diagram of this solution would you with a proper program sample?

It looks like this is exactly what I'd like to do - except on a CR1000. Is that the best shunt for this application? thanks again. (https://www.campbellsci.com/forum?forum=1&l=thread&tid=15576)


aks Nov 30, 2018 08:14 AM

What you describe sounds like you should be doing a power performance analysis for your system. You basically have to caharcterize the power produced vs. wind speed at the site. You will  need a a measurement of wind speed. Do you have a weather system on the site?

Please let  me know the current and voltage levels you expect from the system so we can size the shunt accordingly. Also please e mail me directly at asinghATCampbellsci.com, so I can send you a smaple program.


clwong Apr 28, 2021 01:07 AM

@aks I am doing similiar application for performance comparison like @AMK describe.

Voltage level is below 48VDC and <40Ampere.

May I have a reference?

Thank you.


aks Apr 28, 2021 10:06 AM

You have a few options:

1. Use a current shunt on the low side, closer to the ground. The shunt resistance should be in the range of milliOhms, so that the power dissipated through the snt itself is minimal. Something similar to the following:

http://www.emproshunts.com/product.aspx?Category=9

2. Use a Hall Effect sensor, something simialr to the following:

https://www.magnelab.com/product-category/dc-current-sensors/

I am sure youwill ahve plenty of optons in your location.

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