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"Watt's Up" RC Watt Meter & Power Analyzer WU100 Version 2 --- SALE!

4.4 out of 5 stars 122 customer reviews
| 43 answered questions
Price: $54.99 & FREE Shipping. Details
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Sold by Battery Superstore and Fulfilled by Amazon. Gift-wrap available.

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  • Enter your model number above to make sure this fits.
  • Fine-tuning your electric RC cars & planes for great performance doesn't have to be a guessing game. Measures energy (Wh), charge (Ah), power (W), current (A) and voltage (V) for any rechargeable battery pack from 4 - 60V, including NiCd, NiMH , and SLA, and Li-Ion battery packs
  • Small & Light: 2.8" long x 1.7" wide x 0.83" thick (70 mm x 44 mm x 21 mm), 2.5 oz. That's lifting a 50 pound model into outer space (65 mi.)!
  • Acts like a wire so doesn't affect model's performance. Precision current sensing resistor, with only 0.001 Ohm resistance and circuitry only draws 0.007 Amps
  • Uses DSP to increase ADC resolution and differential measurement amplifiers to increase noise immunity Factory calibration stores constants in EEPROM to compensate for component tolerances
  • Accurate & precise - 0.01 A current and 0.01 V voltage resolutions. Connector to use a receiver battery for measurement down to 0 V
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$54.99 & FREE Shipping. Details In Stock. Sold by Battery Superstore and Fulfilled by Amazon. Gift-wrap available.

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Frequently Bought Together

  • "Watt's Up" RC Watt Meter & Power Analyzer WU100 Version 2 --- SALE!
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  • Parts Express ATC/ATO Water-resistant Fuse Holder - 10 AWG
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Technical Details

  • Brand Name: Tenergy
  • Model Number: WU100

Product Details

  • Shipping Weight: 2.4 ounces (View shipping rates and policies)
  • ASIN: B001B6N2WK
  • Item model number: WU100
  • Average Customer Review: 4.4 out of 5 stars  See all reviews (122 customer reviews)
  • Amazon Best Sellers Rank:
    • Product Warranty: For warranty information about this product, please click here
  • Date first available at Amazon.com: January 21, 2010

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Customer Questions & Answers
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Customer Reviews

Most Helpful Customer Reviews

63 of 63 people found the following review helpful
5.0 out of 5 starsOutstanding
By J. Shoffner on February 19, 2010
Verified Purchase
This item is marketed primarily by and in support of RC enthusiasts (toy makers and users). It, however, is not a toy and could cause harm if misused. I purchased the Watt's Up meter to monitor large batteries powering telescopes, associated computers, heaters and lights. This is in an outdoor environment subject to cold and moisture. Follow the instructions and be prepared to be delighted. Perhaps one of the few items on the market which delivers exactly what it is designed to do. Because my application is at night, I wish it had a backlight, but that's not a major problem. My astronomy gear is expensive, portable and uses DC power. The Watt's Up allows me to see what my electronics are really doing in the field, compared to what the manufactors say they are suppose to do. That means early warning for batteries, heaters, internal components (computers, motors and chip sets) and in the environment they are used. The Watt's up is well made, weather resistant, and compact. During a session, it even records relavant data and continually updates itself. It won't pour your coffee, but it will watch your DC systems better than you could without it. A very, very good buy.
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53 of 54 people found the following review helpful
5.0 out of 5 starsTool measures power usage, capacity and energy for RC planes and MUCH more.
By D Taylor TOP 1000 REVIEWER on June 2, 2012
Length: 2:10 Mins
The Watt's Up meter is an Inline DC meter that measures 8 parameters. Amp houses (Ah), Watt Hours (Wh), Voltage (v), Watts (w), and captures peak current (AmpsPeak) Peak Power (WattsPeak), voltage Sag (VoltsMin), and power consumed with (AmpHours)

Here are the Watts Up parameter, ranges and resolution
Voltage, 0-60v, 0.01v
Current, 0-110Amps, 0.01A
Power, 0-6554 watts, 0.01W
Charge, 0-65 Amp Hours, 0.001Ah
Energy, 0-6552 WattHours, 0.1 Wh

Minimum voltage is about 4.0 volts for operation of the meter itself.

I use this for testing all kinds of things, from RC gear, to Ham radio gear, to portable Solar systems. It does take some work to get it plugged into things. It comes with about 6" of bare wire on each end. I had to make adapters for the various typs of connections I plan to use. I start with Anderson Power Pole directly attached to the unit and then have adapters for several others.

5 Stars, this is an accurate and very handy tool
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35 of 37 people found the following review helpful
5.0 out of 5 starsListed as a toy but it is a good tool
By Paul54 on February 27, 2011
Verified Purchase
I purchased this meter after learning about it on a few of the solar power forums on the net. I am using it to monitor a small home solar power system. So far I am very pleased. I especially like the fact that it will measure amps and watts over time, along with minimum voltage and peak currents. I would say it is indispensable for maintaining or tuning a small solar set up. I have only been using it for a few days but if it lasts I am very pleased. The 60 amp limit is a real plus.
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15 of 15 people found the following review helpful
5.0 out of 5 starsA Precision Instrument -- Not a Toy!
By AstroSeeker on September 18, 2011
Verified Purchase
I bought this as part of a project to charge my laptop battery using 4 bicycle bottle dynamo and I used the Watt's Up to monitor the charge, voltage and current. I have to make a little box to hold the Watt's Up and some circuit components (see the picture in the product page)
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UPDATE:
Some time the display just blanked out. If you use this out door (like mounting it on a bicycle) be carefull to stay away from heavy rain. After ridding my bike in the rain, my Watt's Up was acting up and I had to let it dry out to get it to work again.
Put it in a plastic bag and keep it from the rain.
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This item is definitely not a toy. It works very very well for serious measurement. I bought it to monitor the charge, voltage and power while my battery is being charged by a solar pannel (or four bike dynamo). It gives accurate measurement -- I am very happy. I love the fact that this thing is tiny and
very light weight. I was able to mount it on the handle bar of my bike and monitor the electrical parameters of my bike dynamo.

Make sure to download the manual from on-line and if you plan to measure voltage below 4 voltage, you will need a 9V battery with Snap connector
from Radio Shack and a Servo plug from a toy store. Just tell them you need a male servo plug that goes into the three pins.
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23 of 25 people found the following review helpful
5.0 out of 5 starsExcellent Buy
By pjltech on August 28, 2010
Verified Purchase
This device is being used as an eBike power monitor. It's very easy to install and works exactly as advertised. Shows instantaneous Volts, Amps,and Watts. After a ride, it shows the total energy used in WattHours, and the peak current and power used during the ride, as well as the minimum battery voltage. Extremely useful for monitoring battery consumption and condition. It will not quantitatively display regenerated current but it does show the rise in battery voltage during regenerative braking. Excellent product; excellent price.
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20 of 23 people found the following review helpful
5.0 out of 5 starsWatt's Up watt meter
By KA99501 on November 13, 2011
Verified Purchase
I bought this because of the reviews I had read on Amazon. It has turned out to be one of the best investment I've made in my off-grid solar/system. With it I could determine the total amount of watt hours I was getting from my solar panels on sunny and cloudy days. As a result I determined that I needed to purchase more solar panels for my total electrical needs. It is an invaluable tool for the small scale off grid person. One can also rig it into any appliance to determine the amount of energy that unit is using. I put 4 inexpensive rubber shielded alligator clips on the unit as this allows for many different applications. Great little gadget!
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