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Adding a center tap is only going to work for between two legs of the delta. All of your wall connectors would have to be across the same two phases. If you do this more that once (across two other phases) you’ll instantly cause a fault between those two transformers.

It can be a code compliant service configuration, but it has fallen into obscurity. Here is an article describing some disadvantages Disadvantages And Regulations: Code Rules for Ungrounded Systems

Yeah, you’re either looking at getting your utility to convert your service to a center tap delta, or getting a 60 KVA isolation transformer. You could look into something more exotic like a delta/wye grounding transformer where the wye is connected to your delta feed and the delta isn’t...

Is this in an existing facility? Was there some sort of industrial process going on there before? Ungrounded delta setups are not very common even in commercial. Typically they were installed when you didn’t want the factory to stop for anything, and the idea is that you would be fine unless two...

Do you have a corner grounded delta feed? If so, have you tried the 277v mode through the dip switches? That mode changes the 120V to ground check to a single check of phase to neutral in the 277v wye configuration, which would be electrically identical to your corner grounded delta (obviously...

It wouldn't harm the generator at all (that's the purpose of load shedding), but what you are going with works just as well.

I wouldn't decrease setting on the HPWC; the generator is overload protected by it's load shedding capability with the 100A contactor. But it's up to you, best of luck.

I have it setup to be load shed from the transfer switch. I have my AC, EVSE's, garage heater, and hot tub on contactors controlled by the transfer switch. If the transfer switch senses overload via drop in frequency, it drops everything, waits 5 minutes, and brings things back on one at a time...

I have a 22 kW Generac, and I have a similar setup. PSP Products has a 100 amp contactor, complete with enclosure all ready to go. $109 plus shipping and you're good to go. Just FYI, if you're on natural gas, you're going to be lucky to get 60 amps out of a 20 kW. You're also going to lose...

Source: https://www.portal.state.pa.us/portal/server.pt/document/1613738/montly_for_novembermtgcacreport_pdf "PA Turnpike Electric Vehicle ChargingDEP has been working with the PA Turnpike on the deployment of direct current (DC) fast charging stations onthe PA Turnpike. At the last update...

I purchased this 50 foot 14-50 extension cord. It is 6 AWG and works great. I've never even felt it get warm pulling 40A. http://www.homedepot.com/p/Rodale-50-ft-50-Amp-RV-Extension-Cord-with-LED-RV50A50WL/202669075

The issue with the Eaton Chademo chargers is most often the Emergency Stop was pressed by someone. If this is the case, the Emergency Stop mushroom switch must be rotated to release it. Then someone with a key must open the charger cabinet to reset the main 3-phase AC circuit breaker. This...

Whether the price is worth it or not is a valid question, but it's good to know what the options are anyway.

The proper "boost" transformer would be an autotransformer wired in a boost configuration. This means that the primary is wired in series with the secondary. All the current bypasses the primary except for the current required to boost the secondary, and the power through the secondary is...

If you think you can sequence or behavior manage the loads effectively, just add a load shedding control to break the pilot signal in one of the HPWCs in the event you exceed your feeder capacity. This way, if both started to ramp up to max, one would be cut off. Here is an example of a load...

I agree with the theory here, but I'll add a larger battery would support even faster low SOC charging rates, meaning you'd spend even less time waiting to charge for the same range recovered.

I have a Ford Focus Electric and it is my primary vehicle. The key to the car is mobile charging. I have a Tesla UMC converted to J1772 and am able to charge off of just about any source. This has really made the car for me. Without mobile charging, I would not be nearly as satisfied as I am...

NetZero, thanks for the info, but I need a lot more resolution to examine this further. 2 minutes before and after, voltage across both lines to neutral, current on both lines, and power factor. Unfortunately, TED only measures a single line (why you only see ~120V). And at least second by...

Is it possible to post the logs of a session where the charging was reduced and when it wasn't from visible Tesla? Current and voltage versus time?

I understand. Lever bypass is nicer. I just get concerned anytime the meter is pulled because there are a lot of people who don't know what they are doing and it is relatively easy to damage.

Okay, 203V is normal for charging Y-connected 3 phase line to line. - - - Updated - - - PPL spec's horn bypass for 200 amp single phase UG. But the bypass isn't what I'm referring to: The action of pulling the meter, if not done completely vertical, can spread any of the four jaws apart. I...

Is the generator connected with a transfer switch? Automatic or manual (interlock)? If you have a transfer switch, most likely your meter got pulled. If the meter wasn't pulled carefully, the jaws can be very easily spread. If the jaws are no longer tight, you will have a poor connection, and it...

If you have 203V you have major issues. When they come to meter you service, start charging your Model S to increase the load. Have you metered at your main breaker? There should be little difference, only the voltage drop due to the 1 foot 6 AWG plus the UMC cabling.

Is 203-250 for anywhere you ever charged, or is that just at home? If you have <228V you have issues.

I ended up doing 1 AWG copper, but then again, the Clippercreek doesn't have the space or small terminal issues the HPWC has.

My EVSE has this built right in. Clippercreek CS-90. There are inputs to inhibit charging until the input goes off or restrict it to 6A. Clippercreek Manual: https://www.clippercreek.com/pdf/CS-100%20User%20Manual%2075A%20DLP%20091124%20v01.pdf Page 16 "Load Management Inputs"

During typical power outages, the natural gas will continue to flow. The pumping stations are backed up by, you guessed it, natural gas generators. However, since you are in California, I will state that during a severe earthquake, natural gas distribution may be ruptured and shut off. Depending...

You could do this right now with J1772. The EVSE can decrease/increase the amapacity it advertises during the charging session. Networked EVSE's could monitor the main feeder utilization and vary the advertised amapacity to not exceed a set limit. The EVSE could increase the pilot signal duty...

If you're really concerned about charging when the grid is down, natural gas generators are the way to go. You can't beat the power they yield at that price. I have a Generac 22kW air cooled for this exact reason. For you guys with 85 kWh batteries, a couple hours without power isn't an issue...

A bit off topic here, but does anyone with a HPWC know if the pilot signal will change during charging if the dip switches are changed? If it does, it wouldn't be too hard to realize a design that consists of two split core CT's around the feeders to measure feeder current and set it up to...

No, do not add up the two current measurements. You are correct, this is split phase. Split phase works by taking two ends of the transformer secondary, with a grounded center tapped neutral conductor. Voltage from each end of the transformer secondary, or each line/leg, will give you 120VAC...

Are the incandescent lamps on a dimmer? If they are, see if you can recreate the issue with just a lamp plugged into the wall with an incandescent bulb. I would also be sure the outlet is on the same line (split phase has line A and B; some call them legs) as the flickering lights are. Does this...

Sorry tcampos, I was referring to islandbayy's post on the high voltage with no current readout on the car's display.

I apologize, in the spec it's called out as "Insulation test for DC Current" (Page 38). To summarize: Charger applies test voltage to DC side of charging circuit to check from ground fault and short circuit inside the charger and within the charging cable. Test is conducted before each...

You were probably seeing the isolation check process. I'm not sure why the car displayed it, but it happens before all chademo sessions. The contactors stay open, and the station applies voltage to see if any current leaks. If anything leaks, there is a compromise in the circuit isolation, and...

I have used my 50 foot 50 amp 14-50 a bunch of times. Extremely useful. Even at 40 amps, it only has a couple volts dropped and remains cool. http://m.homedepot.com/p/Rodale-50-ft-50-Amp-RV-Extension-Cord-with-LED-RV50A50WL/202669075

I was hoping they would add more native adapters to the lineup, not remove them... :frown: I'm glad I got all of them when they were available.

Check for that smell again next time you charge. It could be a loose connection somewhere heating up. These Bosch chargers have connection points that require ring terminal eyelets to be crimped on; it could be a bad crimp. You should have no smell associated with charging.

It'll be good to see you guys there. I'll be there as well with the FFE. Hope the rain holds out.

Preface: I am a FFE owner. I believe going forward, the standard EV connection should be the Tesla plug. Most charging stations could easily have their cords swapped. An adapter for Tesla to J1772 could be easily manufactured. All of the J1772 vehicles could easily be kept compatible with a...

If you look at the HCS series user manual, there is a provision for a 40A pilot signal version, or a HCS-50. Clippercreek just hasn't released it yet. They started with the HCS-40 only, expanded to the HCS-60, and I can only assume they will next release the HCS-50.

Here is a write up I did for a community/university charging parking lot that already had some Level 2 Eaton stations. It might have some useful information. I realize Tesla owner's would appreciate the NEMA 5-20, but if it's between that and 6 additional parking spaces being wired up on a 200...

The J1772 cord set that Clippercreek uses on their CS-100 is 80A capable. J1772 connectors can definitely do 80A.

I went pretty much the same route. I bought a 2012 FFE with 2,000 miles on it this past November. Just to add some experience, if you are going to get the Leaf, make sure you go with one with the 6.6 kW charger. High speed charging is much more important in a low range EV like the FFE or the...

ಠ_ಠ I really hope that was a joke.

That is my favorite of the outdoor 14-50R enclosures. Good choice!

I bought my FFE in November and have put about 8,000 miles. Since you're in Atlanta, I'd say you're in a pretty great climate for the car. It has been a great car, and I'm very pleased with the purchase. I commute 32 miles a day for work. My worst range was 38 miles when it was -15F in the...

Everyone at the event only had single chargers, but seeing as the disconnect switch it was connected to was only 60A rated, it's safe to assume it will not supply 80A (would need a 100 amp disconnect for that). However, it was supplying 40A to those with single chargers. Just FYI. Great event...

Awesome! Thanks for all the coverage, JakeP. On a side note, are you and Newscutter attending the Tesla HPWC open house event at the CMU Electric Garage tomorrow night 4-7pm?

Or you could just replace the outlet when it starts to get loose. Only $8.