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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.


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.

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