Titanium48
Posts: 148
Joined: Thu Jan 31, 2019 7:33 am
Delivery Date: 25 Jan 2019
Location: Edmonton, AB

Re: Boost mode for EVSE?

Thu Nov 21, 2019 1:23 pm

A little more research suggests that the limit is 1 hour or a 50% duty cycle for loads under 225 A, at least in Canada anyways:
8-104 Maximum circuit loading (see Appendix B)

(3) The calculated load in a consumer's service, feeder, or branch circuit shall be considered a continuous load unless it can be shown that in normal operation it will not persist for
(a) a total of more than 1 h in any two-hour period if the load does not exceed 225 A; or
(b) a total of more than 3 h in any six-hour period if the load exceeds 225 A.
That does make it less useful. An extra 4 A over 3 hours is 10% on a 30 kWh car, but only 3% if the boost is limited to 1 hour.
2016 SL

Oilpan4
Posts: 1809
Joined: Wed Jan 09, 2019 10:51 pm
Delivery Date: 10 May 2018
Leaf Number: 004270

Re: Boost mode for EVSE?

Thu Dec 05, 2019 2:15 am

Well I tried running my home chademo on a 30 amp circuit, just to see what would happen.
It ran for over an hour on 2 different 30 amp circuits using square D QO breakers and it didn't trip.
My home chademo typically draws 34 to 35 amps.
Normally I plug it into my 100 amp welder circuit on 4 gauge cable.
"THE ABOVE POST CONTAINS MISLEADING AND INACCURATE INFORMATION. PLEASE CONSIDER IT OPINION, NOT FACT". -someone who I offended and is unable to produce the facts in question.

jjeff
Posts: 2204
Joined: Wed Jan 13, 2016 9:10 am
Delivery Date: 13 Jul 2014
Leaf Number: 422121
Location: MSP MN

Re: Boost mode for EVSE?

Thu Dec 05, 2019 12:55 pm

Oilpan4 wrote:
Thu Dec 05, 2019 2:15 am
Well I tried running my home chademo on a 30 amp circuit, just to see what would happen.
It ran for over an hour on 2 different 30 amp circuits using square D QO breakers and it didn't trip.
My home chademo typically draws 34 to 35 amps.
Normally I plug it into my 100 amp welder circuit on 4 gauge cable.
:shock: did you feel the breakers after that hour? My guess is they were quite toasty(feel the breaker itself near the toggle with the back of your finger). I've occasionally ran close to 30a(27.5) with a standard breaker but even that the breaker got almost hot after an hour and I have no idea how hot the wiring behind the wall got. Also running at 27.5a the prongs on my L14-30 plugs get quite warm after a couple of hours, can't imagine at 30+amps :o
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

Oilpan4
Posts: 1809
Joined: Wed Jan 09, 2019 10:51 pm
Delivery Date: 10 May 2018
Leaf Number: 004270

Re: Boost mode for EVSE?

Thu Dec 05, 2019 3:20 pm

It was marginally warm, not even enough to make me want to look at it with my flir i7.
"THE ABOVE POST CONTAINS MISLEADING AND INACCURATE INFORMATION. PLEASE CONSIDER IT OPINION, NOT FACT". -someone who I offended and is unable to produce the facts in question.

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