A meter just for the charging circuit?

  • SUPPORT THE SITE AND ENJOY A PREMIUM EXPERIENCE!
    Welcome to Tesla Owners Online, four years young! For a low subscription fee, you will receive access to an ad-free version of TOO. We now offer yearly memberships! You can subscribe via this direct link:
    https://teslaownersonline.com/account/upgrades

    SUBSCRIBE TO OUR YOUTUBE CHANNEL!
    Did you know we have a YouTube channel that's all about Tesla? Lots of Tesla information, fun, vlogs, product reviews, and a weekly Tesla Owners Online Podcast as well!

garsh

Dis Member
Moderator
TOO Supporting Member
Joined
Apr 4, 2016
Messages
13,049
Location
Pittsburgh PA
Country
Country
Tesla Owner
Model 3
#1
I'm starting to think about adding a 50 amp circuit and NEMA 14-50 outlet in my garage. I'd like to add some sort of meter just for that circuit, so I can keep track of just the electricity I use to charge my car.

Ideally, I'd like a box with either an ethernet jack or wifi. Something where I can slurp the data and store it, so I can go back and look at the history.

I found this article:
EKM Digital Submeter Measures EV Charging Efficiency
But the meter it talks about using sounds like it just has a digital readout.

Alternately, I found this device:
rainforest automation Eagle Energy Gateway
Which sounds like it will do all of the networking/cloud stuff that I want, but it talks to your house's smart meter, so it will show usage of the whole house, not just the one circuit.

Does anybody else have ideas?
 

Badback

Valued Community Member
TOO Supporting Member
Joined
Apr 7, 2016
Messages
1,111
Location
Prior Lake, MN
Country
Country
Tesla Owner
Reservation
#2
I'm starting to think about adding a 50 amp circuit and NEMA 14-50 outlet in my garage. I'd like to add some sort of meter just for that circuit, so I can keep track of just the electricity I use to charge my car.

Ideally, I'd like a box with either an ethernet jack or wifi. Something where I can slurp the data and store it, so I can go back and look at the history.

I found this article:
EKM Digital Submeter Measures EV Charging Efficiency
But the meter it talks about using sounds like it just has a digital readout.

Alternately, I found this device:
rainforest automation Eagle Energy Gateway
Which sounds like it will do all of the networking/cloud stuff that I want, but it talks to your house's smart meter, so it will show usage of the whole house, not just the one circuit.

Does anybody else have ideas?
Like I responded to the other thread on this very subject: https://www.egauge.net/

I have this device on my solar system. It is easy to install and setup. It generates its own web page and just needs a WiFi or an Ethernet connection to the Internet.
 

garsh

Dis Member
Moderator
TOO Supporting Member
Joined
Apr 4, 2016
Messages
13,049
Location
Pittsburgh PA
Country
Country
Tesla Owner
Model 3
#5
IIRC, the egauge was ~$500 and supported ~12 circuits, correct?
Do you have to buy the taps (induction coils, whatever they're called) separately?
How is historical information stored?
 

garsh

Dis Member
Moderator
TOO Supporting Member
Joined
Apr 4, 2016
Messages
13,049
Location
Pittsburgh PA
Country
Country
Tesla Owner
Model 3
#6
Another idea, posted by @KennethK in this thread.
Slickdeals: Aeon Labs Aeotec Z-Wave Smart Energy Meter
On sale for $17.50 & free shipping.

Pros:
  • Uses a standard protocol (Z-Wave) for communication with HUBs.
  • Variety of HUBs available,
  • Can be powered via USB or four AA batteries
  • Very inexpensive
Cons:
  • Not an all-in-one solution. Requires a Z-Wave HUB.
  • Z-Wave is a proprietary (not open) protocol (wikipedia).
I'd feel better if the protocol were open, but given the proliferation of Z-Wave, I'm less worried about support disappearing anytime soon.

This is a discontinued model. There is a new version available now.

I found a thread where people are discussing these devices. TLDR: Not truly accurate. I'm not sure how much I care.

It's not yet clear to me how I go from having the meter and a hub, and ending up with a website with power usage graphs and historical records.
 

garsh

Dis Member
Moderator
TOO Supporting Member
Joined
Apr 4, 2016
Messages
13,049
Location
Pittsburgh PA
Country
Country
Tesla Owner
Model 3
#7
I had some time this morning to also look more closely into @Badback 's suggestion.
https://www.egauge.net/
The EG3000 sounds like exactly what I want.
Pros
  • Built-in webserver
  • Built-in storage for 30 years worth of data!
  • Ability to download data
  • Can measure up to 12 separate lines
  • Actually measures the voltage on each phase in addition to current running through the individually-monitored lines, to get a truly accurate power measurement.
Cons
  • Price
The meter costs $494.
Then you need to buy a current transformer (CT) for each line that you want to measure. For a 240v line, you'll need two CTs. Since I'm not worried about "revenue-grade" accuracy, I can go with the least expensive option. For a 50a line, that would appear to be the JD-SCT-010-0050, which they sell for $35.
Total price would then be $564.

That's a lot of money initially, but it sounds like a very nice, expandable system.

A review from TMC
 
Last edited:

@gravityrydr

Top-Contributor
Joined
Apr 12, 2016
Messages
404
Location
Illinois
Country
Country
Tesla Owner
Model 3
#10
Or as I've seen suggested by Model S users on other thread just use the trip B odometer
and keep a running total. It would be nice if Tesla would give use a way to pull usage data to feed the nerd in us.
 

Uricasha

Well-known member
Joined
Feb 19, 2017
Messages
222
Location
Phoenix, AZ
Country
Country
Tesla Owner
No
#12
I use an Efergy Engage meter to monitor my whole house usage but the same unit could provide what you are looking for. It has a remote monitoring unit and a separate remote unit that connects it to the internet. However, all the other suggestions here are great as well.
 

KennethK

Top-Contributor
Joined
Oct 13, 2016
Messages
575
Location
Michigan
Country
Country
#13
I use an Efergy Engage meter to monitor my whole house usage but the same unit could provide what you are looking for. It has a remote monitoring unit and a separate remote unit that connects it to the internet. However, all the other suggestions here are great as well.
Thanks for the input Matthew. I was looking at that one, but it always helps to hear from someone that has the device.
 

TrevP

TOO Founder / Administrator
Founder
Joined
Oct 20, 2015
Messages
7,146
Location
Toronto
Country
Country
Tesla Owner
Model 3
#15
I use an Efergy Engage meter to monitor my whole house usage but the same unit could provide what you are looking for. It has a remote monitoring unit and a separate remote unit that connects it to the internet. However, all the other suggestions here are great as well.
How do you like it so far? Looks affordable, does it track things correctly?

I'm wondering how accurate it would be for tracking a HPWC
 

garsh

Dis Member
Moderator
TOO Supporting Member
Joined
Apr 4, 2016
Messages
13,049
Location
Pittsburgh PA
Country
Country
Tesla Owner
Model 3
#16
Has anyone used this? Looks promising, but $299 is a lot more than I want to spend.
https://sense.com
The idea is sound. I used to have a TED-5000G to monitor my whole house, and I was able to recognize some major things, like the dryer. I could easily imagine that a computer could be trained to pick out even more patterns from the overall usage of electricity.
 

Uricasha

Well-known member
Joined
Feb 19, 2017
Messages
222
Location
Phoenix, AZ
Country
Country
Tesla Owner
No
#17
Over the past two years I've had Efergy Engage, it has gotten a lot better. There online portal is awesome and I can pull reports for energy usage every 5 minutes or energy usage over the year.

For example, for the accuracy question here is the Efergy usage last January vs what my utility reported.


For the hourly graph, here is the comparison


You can notice the refrigerator cycling on and off from 10 AM to 4 PM :)

Also, when I use a single plug energy use monitor like the Belkin Conserve, I can switch on a 150 watt load and the Belkin Conserve/Efergy Engage will read within a couple watts of each other.


There are two downfalls in my opinion, one is my own fault and not the fault of the system.
  1. It can't distinguish which way the energy is flowing so when my solar is producing more than my house loads, the Efergy Engage won't tell you that your'e backfeeding. The clamps used for reading the energy flow aren't designed to distinguish direction so not really the fault of the unit. This "fault" of the system is noticeable when you're comparing the graphs above. The Efergy Engage unit will typically report higher usage because of the backfeeding into the grid that happens during the day.
  2. The unit will bottom out at 200 watts meaning it won't tell you if you're total load is 50 watts or 150 watts, it will read out 200 watts for both. However, anything above 200 watts total load is pretty accurate.

I would definitely purchase again.
 
Last edited:

Uricasha

Well-known member
Joined
Feb 19, 2017
Messages
222
Location
Phoenix, AZ
Country
Country
Tesla Owner
No
#18
If you want to login into the online portal, I can send you my login/password thru private message so you can play around.
 
4

4701

Guest
#19
I've also considered some high tech stuff but after all, graphs are all pointless. Load is stable
and it lasts as long as charging. Instead of wasting money I just had the most reliable and cheap and effective
way to count kilowatt-hours for 14€. I even preferred LCD version but guy said that they are not as reliable
as mechanical versions (no need for flash memory). As I want it to last 5+ years I chose that.
Simple DIN meter right next to the 16A EVSE breaker. I could have installed that in the EVSE housing but
the 30m cable between main box and EVSE is not 100% efficient. Therefore the closer to the main power meter the better.
Meter can be loaded up to 40A. I charge at 16A so definitely not problem.
I think I will add one more for my house heat pump.
 
Last edited by a moderator:

garsh

Dis Member
Moderator
TOO Supporting Member
Joined
Apr 4, 2016
Messages
13,049
Location
Pittsburgh PA
Country
Country
Tesla Owner
Model 3
#20
I've managed to procure two old TED 5000 MTUs and Gateways. I'm going to make use of these.

Unfortunately, the Footprints software that comes with it is pretty limited. It only shows per-minute data for the last half hour. You can only view historical data at hour granularity. The good news is, the gateway presents a simple web-server interface for obtaining data. I can just send a request to:
http://<My TED Gateway IP Address>/api/LiveData.xml​
And it will respond with a nicely-formatted XML page full of the latest data.

Does anybody know of any software packages that are designed to poll devices for this data, store it, and present a nice interface for examining it? I'd prefer something that runs on Linux.