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.
In my case the thing that generates the heat is the relay. If you are experiencing shutdowns due to temperature, you could relocate the relay to another place (if that is what it is). I see that it is the relay because the temperature goes up when charging and goes down when not. The only change in the system is the state of the relay. Obviously there is some heat loss through the wire but that is pretty small.
Thanks for the reply.
No, the relays are not getting hot, the Universal EVSE Controller is the one that gets very hot and the displays flickers a warning ( don't remember what exactly it displayed ) and it stops charging, I was thinking of putting a heat sink on the Universal EVSE Controller but the display won't let me, no room in it.
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.
William, Those temperatures are not normal. Something is very wrong if temperatures are 64C. Here is my personal station during the hottest month of summer in the Mojave Desert.
William, we will replace the display under the 1 year warranty.
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.
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