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Old 10-10-2019, 05:41 AM
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Been playing with solar,want to get a meter this weekend.

I don't know if KAW is the best,but seems the most popular/common.Think it was the P3 international?

1)can I use an extension cord to hook it up behind fridge/furniture?

2) do I have to be watching when the fridge/AC kicks on to check the surge/start-up,or does it record the max and avg run?

3)Will it work with a circular saw/power tools and what will it tell me?

4)will it work with a gas generator,modified sine or pure sine invertor

Any other tips or things to know?

Last edited by jfountain2; 10-10-2019 at 10:15 AM..
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Old 10-10-2019, 07:29 AM
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Quote:
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...
1)can I use an extension cord to hook it up behind fridge/furniture?
Yes but I would avoid having a overly long extension cord.
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2) do I have to be watching when the fridge/AC kicks on to check the surge/start-up,or does it record the max and avg run?
Some models will record surge but many do not. I am not sure what the P3 does without looking it up.
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3)Will it work with a circular saw/power tools and what will it tell me?
It works with any plug in 120vAC electrical appliance. It will give a readout of volts, amps and watts. Overtime it records total watts used.
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4)will it work with a gas generator,modified sine or pure sine invertor
It might not work the more unstable your supply power is.
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Any other tips or things to know?
The purpose of these devices is to plug in a item (like a refrigerator) and run for a day so that you can get a readout of daily power consumption. This helps those people that are trying to provide their own power to know what their needs might be.
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Old 10-10-2019, 08:12 AM
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I have a cheap one that loses all its information every time it gets unplugged. It requires a person to plan ahead when measuring power on items where the plug is difficult to reach.


Mine will show the peak at start up in real time but doesnt record it. It only records total kwh and hours it's been running.
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Old 10-10-2019, 09:35 AM
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Careful make sure the one you buy was manufactured for your country. Some are converts to be used in the USA and do not work properly. Just because you buy it in the USA does not mean anything.
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Old 10-10-2019, 10:08 AM
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So what are my options,my plan was to go to Home De[pot after work sat.
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Old 10-10-2019, 01:33 PM
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So what are my options,my plan was to go to Home De[pot after work sat.
That or Lowes not WalMart is where I would go.
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Old 10-10-2019, 02:17 PM
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Does someone have a link to one of these monitoring meters?
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Old 10-10-2019, 02:22 PM
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https://en.wikipedia.org/wiki/Kill_A_Watt

https://www.bestreviews.guide/kill-a...&google_params[matchtype]=b&google_params[network]=g&google_params[device]=c&google_params[creative]=381543623185&google_params[keyword]=&google_params[adposition]=1o1&google_params[adgroupid]=76772379734&google_params[campaignid]=6490998898&bs=&google_params[feeditemid]=&google_params[targetid]=dsa-19959388920&google_params[loc_interest_ms]=&google_params[loc_physical_ms]=9029609&google_params[devicemodel]=&google_params[target]=&new_api=true&dest=0&sys_id=0|254&gclid=Cj0KCQjwr fvsBRD7ARIsAKuDvMNvV7IfL3wL5O2fijTcvCtTSlKhmguAqrN 75ACDdmMuy23DN34GAnwaAvvBEALw_wcB
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Old 10-10-2019, 06:51 PM
RobertSWMissouri RobertSWMissouri is online now
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Used to be able to find old elec. co. meters; get a base, wire up plug on one side, outlet on the other (either 110 or 220 !).
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Old 10-12-2019, 01:41 PM
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A killAwatt meter is good for measureing useage across a time span. There really not good for peak amps. There not very accurate for hz, volts or much else. But for the price i cant think of a better tool to measure useage across a time period.

For the rest get a camp on amp meter.
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Old 10-12-2019, 10:12 PM
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Quote:
Originally Posted by Brettny View Post
A killAwatt meter is good for measureing useage across a time span. There really not good for peak amps. There not very accurate for hz, volts or much else. But for the price i cant think of a better tool to measure useage across a time period.

For the rest get a camp on amp meter.
How so?

Have had no issues with my P3 and it gets used a lot...
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Old 10-12-2019, 10:26 PM
John Galt 1 John Galt 1 is offline
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The Kill A Watt meter is good for measuring something like how much power (volts, amps, and watts) is your fridge using now and assuming you can time it to measure for a set period of time like 24 hours it can tell you how much power in watts your fridge used in 24 hours. It's not super accurate but within 3% so it's fine for determining how much solar power and batteries you need.

The Kill A Watt meter doesn't show you a motor's electric surge at start up but that's fine since you already understand that an electric motor's surge is roughly 2.5 times it's running draw for less than .2 seconds. You'll need a super expensive meter to do that.

It's also great for discovering phantom loads, things you figured only draw a few watts but instead draw 80 watts when off like a satellite TV receiver. A short extension cord is fine to use with it, maybe adds 2 watts to the reading

My home is off grid solar powered and I've found the Kill A Watt meter to be a useful tool at a fair price.
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Old 10-13-2019, 09:56 AM
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The Kill A Watt meter doesn't show you a motor's electric surge at start up but that's fine since you.
It certainly does if you are looking at it during that start up.

I regularly use mine on motors / machines as they are being used to monitor amp draw and how that draw changes depending on how the motor is used.
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Old 10-13-2019, 10:21 AM
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I'm confused,if I'm watching it,will it show a spike when the compressor kicks on(surge/start up),then runs normal?
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Old 10-13-2019, 12:35 PM
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Quote:
Originally Posted by cook View Post
I'm confused,if I'm watching it,will it show a spike when the compressor kicks on(surge/start up),then runs normal?
Yes it will. What you want to watch is the amp reading. It may not be perfect but it gives you a working idea.
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Old 10-13-2019, 02:59 PM
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Quote:
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I'm confused,if I'm watching it,will it show a spike when the compressor kicks on(surge/start up),then runs normal?
Yes, Will also show you changes in real time as you load or unload a motor. Same thing pretty much...

Nicer industrial motors will usually have an amp meter built in somewhere - For those that do not the P3 is awesome.



Can also be used to check for things like voltage drop. Say you want to run a tool that pulls a good bit of amps but there is no power nearby so you have to pull a long extension cord... You can tell instantly how much voltage you have at the outlet AND at the end of that cord before you potentially damage a motor. Same can be done in old houses with crappy wiring to see if those outlets are up to the task or not voltage wise...



Many, many more uses than just seeing how much power a fridge draws over time.
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Old 10-13-2019, 03:15 PM
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2 notes on the Kill-A-Watt.

1. It will not accurately measure on modified sine wave power from an invertor. It will be accurate on pure sine wave power from an invertor.

2. The ground pin tends to break off internally, so be carefule of potential open-grounds while using it.

Otherwise, a great little unit, and you can watch it live during a motor start-up and see peak draw.
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Old 10-13-2019, 03:26 PM
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Quote:
Originally Posted by cook View Post
I'm confused,if I'm watching it,will it show a spike when the compressor kicks on(surge/start up),then runs normal?
Yes the hardest thing a motor does is start. Therefore it will pull the most amps at start up.

Try some various devices like a large fan, etc. You will see a spike.

And yes when I get something new that measures things I watch it work initially too.
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Old 10-13-2019, 05:52 PM
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Thanks,all,picked it up today.Get some reading to do tonight.Won't get to "play"with it until next weekend.
Not as cool or sexy as a new knife or gun,but another tooth in the self reliance cog.
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Old 10-16-2019, 01:52 PM
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Quote:
Originally Posted by DG23 View Post
Quote:
Originally Posted by Brettny View Post
A killAwatt meter is good for measureing useage across a time span. There really not good for peak amps. There not very accurate for hz, volts or much else. But for the price i cant think of a better tool to measure useage across a time period.

For the rest get a camp on amp meter.
How so?

Have had no issues with my P3 and it gets used a lot...
theres no peak hold, limited digits after the . And they dont function quick so even looking at them may not help.

I still own one and use it but i find my self useing a real volt/amp meter more.
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