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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.

1 person has this problem

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.

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.

This is bothersome to me too.
For instance, the outside air temp is 86F, and the internal temp is 64F  withOUT anything running... it is in sleep mode and has been for a couple of days.
If I were to start charging, the temperature would climb to over 70F and shutdown the charge controller due to over temp.
For a test, I opened the enclosure up while charging and the temp dropped closer to 50F, then I used a small table fan and directed the air flow at the controller PCB.  The power supply seems to be the hottest thing, and in my box, it is below the display.
I am going to use my Flir and take some pics of the boards.
I am also thinking of replacing the switcher on the pcb with a couple of external switchers so I can move them around to find a good position.
I might also try moving the controller to another location in my box, to get it away from the LCD/tempsensor, to reduce local heating of the temp sensor.  I can't believe that the power supply is running this hot at idle, no relay pulled, system in sleep mode.


i also should add that my enclosure is a 6x6x6 plastic conduit box made by Cantex.
If it would help, I can post my thermal pictures, or a link to my dropbox acct.


WELL... some VERY good news to report!
I received the new display today, Thursday 8-9.
My charger has been on all day with an ambient temp of about 100F, and all closed up.
The charger was reporting about 60C just sitting there asleep, so I used this as a baseline reading.
I changed the display, using extremely careful ESD procedures, and powered it up.
First, I looked at the chip with my Flir, and NO SIGNS OF HOT SPOTS!!!!!
This was a GREAT result!
Then I closed it up and powered it up in the same location, and after about 30 minutes the temp was ONLY 33C!!!!
This is more like it, and I thank you for helping out!!!
It's nice when things work out!
I am going to leave it on like I normally do, and see what the temperature stabilizes at, although I am sure it won't be NEAR 60C.
I did take a look with my Flir after it had been on a while, and the chip was about 95F (35C), ambient temp, with NO hot spots!


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.

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.


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