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Hi Jim,

That is throttling due to exceeding temperature thresholds. If you are running firmware 3.7.8 (version is displayed when powered on) the thresholds are very conservative. Later releases increased the thresholds by 10C which will greatly reduce unnecessary throttling. If you are running a later version, you should inspect all the high current connections and ensure they are clean and secure.

Chris

That sounds a lot higher than normal. On my station in the Mojave desert, I charge at 40A while my garage has been above 100F all day. I can charge at 40A indefinitely without throttling. I would recommend inspecting the high current wiring at the contractor.

There are a couple things you can do.

The build guide suggests stripping 3/4" - 1" of insulation, combining the 2 wires and folding in half (so the equivalent of 4 wires are in the lug). This gives more contact area,

Another option is to do the same, combine the 2 wires and fold in half with 6AWG ferrules, however this requires a crimper and a die.

http://www.digikey.com/product-detail/en/phoenix-contact/3200425/277-2152-ND/2424711

Another thing you can do to receive the earliest possible warning is to set up an E-mail notification if temperature climbs above 65C or even 60C if you prefer to get the notification before the throttling kicks in.

details are in the guide here:

http://openevse.dozuki.com/Guide/OpenEVSE+WiFi+%28Beta%29/14

Step 6 Example 2.

Example 2 - Send E-mail every 5 minutes when temperature exceeds 65C. Add the values in the Blue box to the active Temp input. Logic If temperature is greater than 65C and 300 seconds have passed (5 minutes) Send an Email with the current temperature.