Has anyone install a DCC-10 EV Energy Management System with a Tesla Wall Connector?

[Wildbill]

I am currently trying to install a NEMA 14-50 outlet or possibly a Tesla Wall Connector. However, my sub panel is pretty full and cannot accommodate a NEMA 14-50 outlet. The electrician is recommending installing a DCC-10 EV Energy Management System between the sub panel and the NEMA 14-50 outlet (or Tesla Wall Connector). The DCC-10 will monitor power usage on the panel and allow EV charging when the power consumption on the circuit is less than 80% (but shut down charging when consumption is high to prevent tripping the circuit breaker).

This is the link for the DCC-10: DCC-10-50A | EV Energy Management System | 240/208V, 50A breaker included, Max 200A

I was wondering has anyone installed such setup instead of upgrading the panel, and how well does it work? Any problems with this setup?

I know that it will depend on how much power I use at home. If I use a lot of power, it will trigger the DCC-10 to shut down charging to the Tesla. But I don't think we use over 80% of power often in our household. This might be an alternative to upgrading the sub panel.

 

[DOCAL]

I have one of those, and it's not triggered so far.
The only problem I've had with it, is that it hums. Make sure your installer doesn't leave without taking a listen to make sure it's not too loud for you.

 

[Wildbill]

I have one of those, and it's not triggered so far.
The only problem I've had with it, is that it hums. Make sure your installer doesn't leave without taking a listen to make sure it's not too loud for you.

Thank you for sharing your experience.

Is your DCC-10 paired with a NEMA 14-50 outlet or with a Tesla Connector?

 

[EdM3]

I use a DCC-9 with the Wall Connector with no problems. Is your concern that the Wall Connector and/or the car doesn’t like being shut off? I think it looks like a circuit breaker being flipped and it has a timer so it’s not flapping on and off which would be the main cause of worry. That said, I’m not sure mine has ever triggered either since I usually charge at midnight when the electrical usage is already pretty low. Pretty sure I’d have to be running the dryer and the oven at the same time as charging to hit the trigger point.

 

[DOCAL]

Is your DCC-10 paired with a NEMA 14-50 outlet or with a Tesla Connector?

I had the electrician hard wire the HPWC to it. It's on a 40A circuit, and they correctly set the HPWC to deliver 32A.

Like @EdM3 I charge after midnight, so the total power usage in the house is low.

 

[user212_nr]

It seems pretty unique to be installing the DCC-10 on a sub-panel. You have two really good alternatives:

1) Use one of the lower NEMA circuits that better matches how much power you have. You didn't give exact numbers, but its hard to see how you can support a 50A circuit with a DCC, but can't support a 15-20A dedicated circuit. Its a very sufficient amount of power in practical use.

2) Run a new wire. The DCC box costs $1,050 plus installation. The wire installation might not be too much more if you look around.

 

[andy92782]

I think the DCC-9 is supposed to be installed on a sub-panel. Are you in a condo? What size is the main breaker?

I have a DCC-9-30A and use it with a Tesla Wall Connector. It works fine, though it would trip when the inrush current of the AC system powering up was sensed. I've since installed a new HVAC system with a slow-ramp variable rate compressor. It no longer does this.

I created a huge thread on my install over here.