GeekEV wrote:Yes, the firmware upgrade takes some off the top but gives it back to you at the bottom end int the form of a hidden "reserve". When you get low and it says you've got about 8 miles left, it's really more like 15.
As for temperature of the modified EVSE, Ingineer's done fairly extensive torture testing at significantly higher than 16a. It doesn't get much hotter than that. Lots of us have done it, you'll be fine.
I'm no electrical engineer, but this talk of jumpering things seems strange. Ingineer actually depotted the entire board and found it was all ready for 240v except for a couple components that were rated at 120v. How can you do this without replacing those components or running them way over spec (which doesn't seem safe)? Anyhow, you're free to do whatever you want with your own unit, of course.
I'd love the see Phil comment on this (if he reads this), and how he addressed this issue in his evseupgrade mod.jwallace3 wrote:There is one safety feature that I'm not sure how it can be implemented at 240. The panasonic ESVE checks to see if ground and neutral are tied together to tell the unit that the circuit is properly grounded. At 120 the existing cable has hot, neutral, and ground. If you look at any 240 charger there is still only 3 wires hot 1, hot 2, and ground. So if you modify the panasonic ESVE for 240 charging there is absolutely no way with 3 wires that this feature can be implemented because the charger would be checking to see if the previous neutral terminal (now hot/phase 2) is tied to ground. This would be a bolted fault which would trip the breaker in your panel. So this feature has to be bypassed unless you add a third relay and use a 4 wire nema 14 connector to accomplish this. But with a 3 wire nema 6 it's just not possible.
When I tried my Rev2 mod, it ran pretty hot to me, too. I didn't have anything to measure the temperature with, but it was hot to the touch and you wouldn't want to touch it for more than a few seconds. However, when I asked Phil whether I should put a small fan on the box to keep it cool or not, he said no, that'd be wasteful to do. He said the upgraded EVSE will last longer than the lifetime of the car even with daily use.leafme wrote:Anyway, the temperature of the bottom of the EVSE sitting on a towel got to 129 deg F within two hours of charge start (240v, 12a) and had risen to 136 deg F at the end of the 6 hour charge cycle. That's measured on the outside of the package! I was thinking about upping the EVSE to 16a with Phil's additional upgrade but now I'm concerned about the temperature of the unit if I do so. At this point I need to test it at 120v, 12a to see what temp it gets to but I was surprised it got so high. This says the losses in the unit are greater than I expected. Hmmm...
Just my guess, it thinks there is leakage current because there is leakage currentjwallace3 wrote:the charger doesn't like single phase 240 going through the CT. It thinks there is a current leak. I am still working out the issues.
jwallace3 wrote:I do. I just didn't feel like paying $240+ for this conversion when I can do it for $20. Plus being an electrical engineer, I just wanted to see how they did it and make the mod myself.
Volusiano wrote:Usually electrical components are rated at least at 60C (140F), so I guess while it may feel hot for us to touch, it may still be OK for the components.