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--- ha:evchsrger [04/07/2024 17:14] – created - external edit 127.0.0.1
+++ ha:evchsrger [24/11/2025 00:06] (current) – [EVSE based controller] andrew
@@ Line 1: / Line 1: @@
+====== EV charge controllers ======
+===== Mainpine based =====
 {{:ha:20201107_151753.jpg?400|}}
+Based on a Mainpine controller, internally an ESP series microcontroller, possibly reflashable to Tasmota type code. Would do the MQTT part, not sure how to do the EV control part.
+This should have had a MCB / RCBO fitted as well as an isolator, although the feed is from a 16A socket with it's own MCB.
+Later controller built with https://www.openevse.com/ parts, this supports MQTT over wifi or a wired ethernet. More to come...
+===== EVSE based controller =====
+After the above Mainpine unit went faulty, I built a replacement using an EVSE controller module.
+{{:ha:img_20251122_215836.jpg?400 |}}
+Components used (L to R)
+  * 100A double pole disconnector to isolate the unit. This is fed via a 16A industrial connector and 20A MCB in a consumer unit, it would be better to have a 16A MCB in it too, but there wasn't space and the 16A socket should always be fed via an MCB anyway. This whole consumer unit is protected by an RCD.
+  * 20A contactor driven by the evse module, this provides a 240v output but at low current. The double pole contactor isolates the EV unless energised, so until the cable is connected, the cable is unpowered.
+  * EVSE module (The blue bit marked MinMax visible is the AC to DC converter). This is WiFi capable, but I have disabled it because....
+  * Ethernet module connected to the EVSE unit. This is used instead of the WiFi.
+The round object at the top is a current transformer to measure the current the EV draws.
+The LCD module is driven from the EVSE and changes colour depending  on the charging state of the module (Green - connected but charged, red - charging)
+{{:ha:img_20251122_215818.jpg?400 |}}
+----
+===== MQTT info =====
+This is a simple flow from NodeRed to show data which can be extracted from the EVSE module.
+{{:ha:nodered-evse.png?600|}}
+----
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