I live in florida, you all know the temperature here is closer to hell than any other place. So even in my garage it gets hot especially the Controller, and it is only drawing 13.4 amps per leg on 220 volts.
Is it possible to add a small fan?
and what is the best place to put it and where would it be the air intake?
The only problem it will no longer be water proof.
William, we will replace the display under the 1 year warranty.
I have had problems with my EVSE overheating also. Looking back at temp logs it looks like it reaches 65C and then starts to throttle charging, so I don't think it actually shuts down. But even at idle right now (charging finished about 7 hours ago) temp is at 31C when ambient is only 21C. This seems high!
Could I have a problem with my display also? I have seen this overheating problem happen every week or so, and my EVSE is only about 6 months old.
The heat comes from a few places, The power supplies on the controller put off some waste heat (about 1w at max load), the 2 flameproof resistors on the AC_Test lines also radiate a couple watts. The wiring, connectors, fuses, relay coil, relay connectors all put off some heat as well. The higher the current the more heat.
A heatsink inside the enclosure will not do anything, it just moves the hear from 1 place to another. The ambient temperature sensor in built into the display.
The first thing to check is the firmware version. The original firmware 3.7.8 is very conservative, the latest version 3.11.3 is much better. I would also check that the connectors are well crimped and secure, as a high resistance connection can generate a lot of heat when current is high.
What firmware are you running? Versions 3.11.3 and later do not start to throttle until 65C.
The temperature sensor is on the back of the LCD. If the sun is shining on the LCD it will warm up and provide a higher than normal temperature reading.
The replacement display is on the way.
Please use caution when installing, we believe this issue is caused by ESD. We had a user who was able to trigger display overheating on demand by walking across his carpet then touching his display. He was using a custom enclosure, we were able to resolve the issue by providing better grounding to the display.
Yes, it is likely the IO expander that controls the display is the issue. The temperature sensor is on the display module as well, it is part of the RTC clock chip. The sensor and IO chip are just a few mm from one another.
Adding a fan or cutting holes is not a good idea. Not only does the sealed enclosure keep water out, but it keeps oxygen from getting in if overheating does occur. No oxygen means no fire and a safe shutdown.
What is the maximum temperatur the Open V4 can tolerate? usually mine stay around 32 c (not charging), but some time with a hot day, rise to 65c (charging at 26amp) this is normal?
If it is too hot, they reduce the power itself?