Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.
Register
  • The latest TMC Podcast (#14) is now available on YouTube and all major podcast networks. We covered FSD Beta's exciting v11 update, Enhanced Autopilot coming to the U.S. and Canada, and more!

Digital Energy Monitor for Home Charging Station?

My Roadster delivery is still months away so I'm trying to kill time by getting the garage prepared.

I'm looking for a simple digital energy monitor to go with Tesla's High Power Wall Connector, so I can tell the exact amount of energy drawn by the car for each charge. It needs to handle at least 70A and should have a "reset" button to clear the counter.

Does anyone have recommendations for such a meter? Thanks!
 

dpeilow

Well-Known Member
Moderator
May 23, 2008
9,157
903
Winchester, UK
Try the energy monitors used for Power Distribution Units in Data Centres. Some can send alarms when the current goes below a threshold, useful for an overnight charge failure.

Another way to do it is by adjusting shunt resistor sizes to change the scale on your meter, but I'll let your supplier explain.
 

strider

Active Member
Oct 20, 2010
4,068
1,892
NE Oklahoma
The car itself will tell you that. Each time you turn it on after charging the VDS will display the amount of power and, if you enter your cost per kWh, the cost of the charge. Just make sure the door is closed or the stupid open door warning will cover the charging data. It also keeps an historical record of charge amounts that you can access as well.
 

markwj

Asia Pacific
Moderator
Apr 10, 2011
4,662
1,334
Hong Kong
My Roadster delivery is still months away so I'm trying to kill time by getting the garage prepared.

I'm looking for a simple digital energy monitor to go with Tesla's High Power Wall Connector, so I can tell the exact amount of energy drawn by the car for each charge. It needs to handle at least 70A and should have a "reset" button to clear the counter.

Does anyone have recommendations for such a meter? Thanks!

I use one of these:

OmniMeter I

Expensive, but the company is good to deal with. Not sure about the reset button (you'll have to ask them, because there is such a contact on the top of the unit but I am not sure how/if it works).

I may be wrong but I believe the people who put meters at the charge stations have different numbers than the car's readout.

Yep. I've been working with Tom and Tetsous on this. The Charging History screen is just plain wrong (at least in some circumstances) and I can't trust it. I'm gathering info at the moment to file a bug report with Tesla this week.
 
Now that some time has passed, can you comment on how well the meter is working for you?
I'm thinking about getting one for my Model S...

I think it's better to have a meter on the circuit rather than exclusively trust any in car data, because logically the car data wouldn't record heat loss in the circuit external to the car... (which is still energy you have to pay for of course!!)
 

Products we're discussing on TMC...

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


SUPPORT TMC
Top