This device is a digital watt-meter allowing to monitor power consumption of electrical device. Its works with both AC and DC current. Regarding AC current, the device compute the real power consumption (not just the product of RMS voltage and current), so it can be used to monitor inductive loads. The Yocto-Watt can compute the poser consumption during a given lapse of time. Accuracy will be 1mWh, 1%.
This device is isolated, which means that the sensing part is electrically disconnected from the USB part: you can measure any voltage difference between -250V and 250V, without risk of frying your computer. The modules provides immediate reading on USB, and can also store measures on the device internal flash for later retrieval when connected again by USB.
This device can be connected directly to an Ethernet network using a YoctoHub-Ethernet, to a WiFi network using a YoctoHub-Wireless-g, it can even be connected to a GSM network thanks to the YoctoHub-GSM.
USB cables and enclosure to be ordered separately.
Currently, I'm planning to buy YoctoWatt to monitor all the wattage in my house. I subscribe for 2200KWH.
Will this thing work ?
@funky81: actually the 22000kWh value is not sufficient to answer: is it per month? The decisive parameter is the Amp peak. The Yocto-Watt limit is 16Amp. Note that at 16 Amp continuous , the shunt on the board will get pretty hot (~100░C). Beyond this limit, the device will become a fire hazard.
So I wouldn't use just one single Yocto-Watt for the whole house. I would use, lets say, one Yocto-Watt per circuit, and I would make sure they are properly cooled.
Also note that Yoctopuce devices are not certified (see Yoctopuce's General Terms & Conditions).
Yup, thats 2200KWH per month. Currently, my house current stable at 7.8Amp.
Since this below 16Amp, will it be sufficient enough to use this product?
Anyway, let me check how many circuit my house have.
@funky81: With 7.8Amp avg you seem to be the safe side. Nevertheless you still need to check for peak consumption. Install your Yocto-Watt and switch on as many big equipment as you can. Check that the total consumption is below 16A. You also need to make sure the Yocto-Watt temperature stay reasonable. DO NOT touch it to check, use a infrared-thermometer or install a Yocto-Temperature in the same enclosure.
I'm looking for some indication of the storage capacity and the interval the values can be stored. What place can I find this?
@blacksmith: You can find this in the user manual, Chapter 19 section 2 (see http://www.yoctopuce.com/EN/products/yocto-watt/doc/YWATTMK1.usermanual.html#CHAP19SEC2 ). The Wattmeter can store up to 500'000 measures. Since each data sample stores 5 measures (DC voltage, AC voltage, DC current, AC current and power), it means you can store 100'000 data samples.
I have a Solar Charge Controller and I'd like to see how much output my PV (12v 40W) is providing, what my draw on the load is and what capacity my battery is at.
To do this, would I have to purchase 3 of these units, or is there a better product?
@RB: One single Yocto-Watt can do all this at the same time.
@martinm How is that possible as there is only a single Input/Output?
@RB: There might be a little misunderstanding here: The Yocto-Watt can give the Voltage, Current, Power, and perform Power integration on a electric connection. If you need to monitor several connections, you will need several devices.
Hello i need scan instant power comsuption to motor 0,5 kW 230V every half second. Would this work with Your Yocto-
@ jirkasi: Yes, that should be no problem
I have to measure AC loads which peak 50A. May I use a current transformer, as with other instruments?
@southerner: you can use a current transformer, but be aware that CT will add a small phase shift, which will slightly alter the measure of power. A good CT has a phase shift of only a fraction of degree, which will have no significant impact, but a cheap CT may have several degrees of phase shift.
Hi, I would like to measure the power consumption of a mobile phone and of a single board computer (Odroid), would the Yocto-Watt be good for this application? I used an ammeter before inserting it in between the phone and the battery, but I would like to obtain power measurements
@mmoram Yes, that is a typical use for this product
I'm needing to measure three phase power. From the user manual it looks like it's just single phase, would I need three units for this?
For 3 phases power, it would make more sense to use a power-meter like the one we used here: www.yoctopuce.com/EN/article/monitoring-tectrice-consumption-over-gsm
Calibration doesn't seem to work for data retrieved from the logger?
@markb: Yes, it works also when retrieve data from the datalogger (if it does not, it's a bug!). Note however that when retrieving data from the datalogger, the calibration is applied by the API code: calibration parameters are loaded from the device, and applied to each raw measurement retrieved from the datalogger before returning it.
Looks like a bug in the API then. I see the exact behavior you describe when I read results directly. But not with the Data logger.
@ Mark Brown: I think we should continue this discussion by email. You can send an email to firstname.lastname@example.org.
Also in this email could you precise which programing languages you are using and which version of the Yoctopuce library you are using? It could also help if we can have the part of the code that retrieve measure form the datalogger.