User avatar
Piro
Vendor
Posts: 45
Joined: Sun Feb 19, 2017 5:47 am
Delivery Date: 19 Feb 2017
Location: Kraków, Poland
Contact: Website Facebook YouTube

Video: EVSE with grid monitoring vs 2000W water kettle. Will it prevent trip breakers?

Thu Dec 19, 2019 5:18 am

A test of Grid Monitoring used in Accelev https://www.facebook.com/EVSEChargerAccelev/

Car loads with a max speed of 16A, as the breaker is 16A. Then I start a water kettle (2000W) - once with Grid Monitoring at charger is on the second time - off. I restart charging, as charger needs 1 minute to go back to full speed after switching off the kettle.
The charger detects load (water kettle) and immediately slows down charging. Without that function (with cheap Chinese chargers like Duosida or Zencar) - breakers will be switched off because of grid overload.

https://www.youtube.com/watch?v=FNOAODC7wnk
Alcohol won't solve your problems. On the other hand, milk won't solve them either...
Nissan Leaf tuning http://evtun.com US deliveries from Lake in the Hills, IL

jjeff
Posts: 2118
Joined: Wed Jan 13, 2016 9:10 am
Delivery Date: 13 Jul 2014
Leaf Number: 422121
Location: MSP MN

Re: Video: EVSE with grid monitoring vs 2000W water kettle. Will it prevent trip breakers?

Thu Dec 19, 2019 5:43 am

Just curious how the EVSE knows the current draw of the kettle, so it knows how low to dial down the EVSE?
Does it simply monitor the voltage and when it detects a voltage drop it lowers the draw? Not sure how well that would work.....
The only other way I'd know of would be to have a current sensing device tied to the breaker or kettle outlet and dial down the EVSE that way, of course that would be quite a bit more complicated to implement.
2012 SL purchased used 2/'16
2013 S w/QC purchased new
Juicebox Premium 60a L1/L2 EVSE, Ebusbar 16a L1/L2 EVSE
'12 EVSEupgrade'd 20a L1/L2 EVSE, '13 EVSEupgrade'd adjustable 6-20a L2, 6-13a L1 EVSE
Zencar 13, 20, 30a L1/L2 portable EVSE
GE Durastation 30a

User avatar
Piro
Vendor
Posts: 45
Joined: Sun Feb 19, 2017 5:47 am
Delivery Date: 19 Feb 2017
Location: Kraków, Poland
Contact: Website Facebook YouTube

Re: Video: EVSE with grid monitoring vs 2000W water kettle. Will it prevent trip breakers?

Thu Dec 19, 2019 6:15 am

It monitors the voltage for sure and also behaviour of the grid while starting of load (when current increases).
This is named SOP (State of Power). More tech here https://evtun.com/chargers/sop-health-o ... -grid.html
Alcohol won't solve your problems. On the other hand, milk won't solve them either...
Nissan Leaf tuning http://evtun.com US deliveries from Lake in the Hills, IL

thanar
Posts: 9
Joined: Sat Sep 07, 2019 1:01 am
Delivery Date: 04 Sep 2019

Re: Video: EVSE with grid monitoring vs 2000W water kettle. Will it prevent trip breakers?

Wed Jan 22, 2020 1:19 am

What I do not understand with these dynamic current EVSEs is HOW they communicate their real-time maximum current over to the car. Since the charger is actually in the car, it seems like there is a constant data link between the car and the EVSE, and the EVSE is periodically reporting the max. current available. Is this how it works? Any heads-up to the theory on how this works?

LeftieBiker
Moderator
Posts: 14898
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: Video: EVSE with grid monitoring vs 2000W water kettle. Will it prevent trip breakers?

Wed Jan 22, 2020 1:23 am

thanar wrote:
Wed Jan 22, 2020 1:19 am
What I do not understand with these dynamic current EVSEs is HOW they communicate their real-time maximum current over to the car. Since the charger is actually in the car, it seems like there is a constant data link between the car and the EVSE, and the EVSE is periodically reporting the max. current available. Is this how it works? Any heads-up to the theory on how this works?

Does this have to be how it works? The onboard charger in an EV will use whatever current it is given, from a certain minimum, to its maximum. I don't see why it has to know how much current it is getting from moment to moment, since it is designed to use any current value in that range...
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

WetEV
Posts: 3749
Joined: Fri May 04, 2012 8:25 am
Delivery Date: 16 Feb 2014
Location: Near Seattle, WA

Re: Video: EVSE with grid monitoring vs 2000W water kettle. Will it prevent trip breakers?

Wed Jan 22, 2020 10:09 am

thanar wrote:
Wed Jan 22, 2020 1:19 am
What I do not understand with these dynamic current EVSEs is HOW they communicate their real-time maximum current over to the car. Since the charger is actually in the car, it seems like there is a constant data link between the car and the EVSE, and the EVSE is periodically reporting the max. current available. Is this how it works? Any heads-up to the theory on how this works?
There is a pulse width modulated signal communicating the maximum current the EVSE can supply. Continously.

https://en.wikipedia.org/wiki/SAE_J1772#Control_Pilot

Current sharing EVSEs, with multiple cars connected, will dynamically adjust the currents allowed to each car. This is quite similar.
WetEV
#49
Most everything around here is wet during the rainy season. And the rainy season is long.
2012 Leaf SL Red (Totaled)
2014 Leaf SL Red
2019 eTron Blue

Return to “EVSE / Charging Equipment and Networks”