Tesla Home Charger Kwh Meter

[Ricktesh]

Not sure if anyone is interested but I recently installed this meter by my charger, to track my actual Kwh usage. It was fairly easy to do, and cost around $20 on amazon. (Don't pay attention to the 120V, I didn't directly wire it in my 220V line and just ran power from a 120v outlet thats why its says 120v) I hope this helps thanks.

 

[Acho]

Maybe you know it but just to point- because you powered it of 120v you should multiply the KW and KWh by 2

 

[FlatSix911]

Not sure if anyone is interested but I recently installed this meter by my charger, to track my actual Kwh usage. It was fairly easy to do, and cost around $20 on amazon. (Don't pay attention to the 120V, I didn't directly wire it in my 220V line and just ran power from a 120v outlet thats why its says 120v) I hope this helps thanks.

Cool, but this information is already available on your main information screen in the car

 

[Ricktesh]

Maybe you know it but just to point- because you powered it of 120v you should multiply the KW and KWh by 2

I am sorry i think i explained it wrong the power to the meter is coming from the outlet, but Current Transformer (CT) is actually connected to the 240V, 100A line coming from the breaker. It's like a ring that clips onto the 100A line, The Gauge of the wire is too thick to be directly wired to the meter, thats why i chose to wire it to the 120V outlet.

 

[Ricktesh]

Your

Cool, but this information is already available on your main information screen in the car

This is to track it on a monthly bases to help better determine power usage, and to determine the average electricity cost related to charging the vehicle.

 

[Acho]

I am sorry i think i explained it wrong the power to the meter is coming from the outlet, but Current Transformer (CT) is actually connected to the 240V, 100A line coming from the breaker. It's like a ring that clips onto the 100A line, The Gauge of the wire is too thick to be directly wired to the meter, thats why i chose to wire it to the 120V outlet.

Wats=amp * volts

So half volts from above = half wats

Compare it with the screen in the car

 

[HankLloydRight]

Watts=amp * volts

Exactly.

If you're pulling 47.69 amps from a 240v line, that's actually 11,445 watts (twice what the display reads). The CT can only detect amps, not volts. You need both to calculate watts/kWh.

I use this system from Efergy.com (see: Home of Energy Monitoring | Efergy ) It allows you to monitor energy usage on their website or on your phone with an app, as well as recording and graphing usage over time. There are lots of other systems like this, too. I have the "Elite Hub" kit for online access. The display unit is wireless so you can put it on your desk or table to monitor usage anywhere in the house.

elite engage hub system - home energy gateway

The Efergy system allows you to configure the CTs to the exact voltage running through the line, so the watts and power consumption are accurate. For instance, here's my graph from last May tracking my total consumption (dark green) and solar production (light green). I could even drill down to one week or even one day by hour.

 

[Ricktesh]

Wats=amp * volts

So half volts from above = half wats

Compare it with the screen in the car

Got it thanks

 

[Ricktesh]

Exactly.

If you're pulling 47.69 amps from a 240v line, that's actually 11,445 watts (twice what the display reads). The CT can only detect amps, not volts. You need both to calculate watts/kWh.

I use this system from Efergy.com (see: Home of Energy Monitoring | Efergy ) It allows you to monitor energy usage on their website or on your phone with an app, as well as recording and graphing usage over time. There are lots of other systems like this, too. I have the "Elite Hub" kit for online access. The display unit is wireless so you can put it on your desk or table to monitor usage anywhere in the house.

elite engage hub system - home energy gateway

The Efergy system allows you to configure the CTs to the exact voltage running through the line, so the watts and power consumption are accurate. For instance, here's my graph from last May tracking my total consumption (dark green) and solar production (light green). I could even drill down to one week or even one day by hour.

View attachment 280099

Great info I will try it out thanks.

 

[HankLloydRight]

Also, you might want to look around at other systems that might suit your needs better. That's just the one I picked. I know a lot of people like "TED" New Home Page dev and "Sense" The Sense Home Energy Monitor

Here are some others: 2018 Best Home energy monitors - Pricing & Reviews | EnergySage

Good luck!

 

[Robotpedlr]

I use a similar system from egauge for my HPWC, heat pump and other high energy users. Great to see actual energy use for each as well as home’s overall useage.

 

[CaptRickR]

Juice Box + from Electric Motor Werks has chargers that keep track of this and an App for your phone. I have an X on order and have been using their 40Watt charger on my daughters Leaf and now I have their 75 Watt charger awaiting my X. I get an E-mail on how much power it has used each time it's finished charging and the web site keeps track of overall usage. Another cool factor is you can utilize one set of wires coming from your main breaker box and the chargers talk to each other and limit their Max Watt draw... Been very happy with their Tech Support and their chargers.

Buy a Residential Electric Vehicle (EV) Charging Station

Cheers,

Rick

 

[HankLloydRight]

I am sorry i think i explained it wrong the power to the meter is coming from the outlet, but Current Transformer (CT) is actually connected to the 240V, 100A line coming from the breaker.

I was thinking about this.. do you have just one CT on one power line from the breaker? Or do you have two, one for each hot wire from the breaker box?