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.
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?
The OpenEVSE v4 controller will tolerate temperatures to about 90C before its power supplies shuts down (internal PS temperature of 142C).
Temperature monitoring and throttling will slow down charging at 65C and shutdown if temperature exceeds 72C.
On my own "Advanced Series" station (see graphs below) at 32A (7.68kw) my normal temperature rise is 16C over the starting enclosure temperature. It is very hot where I live, my enclosure temperatures during the hottest months of the summer run from 34C - 44C.
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.
I started getting 'service required overtemp' this June in Minnesota. I have the plastic OVSE enclosure that came with the 'Ultimate Bundle - OpenEVSE P50-WV Kit Level1 & Level2 50A Deluxe' I bought back in March 2017. Prior to getting the overtemps, the last time I opened the enclosure was in May 2018. This thermal image was taken after the EVSE was on for < 1 minute, ambient air temp was 23C. Instead of buying a new IC and trying to re-work or buying a new display module I have used a thermally conductive tape and attached a heat-sink. I'll report back if that keeps it cool enough not to flood the sensor reading.
A heatsink was not effective at lowering the temperature. I replaced the IO expander IC, MCP23017, on August 1st. Temperatures seem more reasonable now.
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.
2 people have this problem