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Faulty charger - Replace the components with OpenEVSE?

Hi all, I have a NewMotion Home Fast that is just under 3 years old and has stopped charging my car (in the UK). I've opened it up but there is nothing obviously wrong with it and the panel doesn't give me any useful logs or messages as to the problem (I also don't like this device as it has no timed charging and gives limited information). The manufacturer is being difficult so I'm working on the assumption I'll need to replace it, so I'm wondering if I can just replace the internal components with an OpenEVSE kit or individual components.


The existing set up has a supplemental earthing rod and is protected by and 40A RCD/MCB as per the photo. The unit is capable of 3-phase although I don't make use of that - max current is 7.4Kw @ 240v.


The installation contactor is an ABB ESB40-40N. Given the cost of these, if possible I would like to reuse this.


Questions:

1. Is this feasible/sensible? (I appreciate I could buy the whole kit with a case but I don't want to throw parts away if not required.)

2. Can I reuse this contactor?

3. The existing ABB Contactor looks like it is controlled by 230v - Does the OpenOVSE also use 230v for the control circuit? I can't find it in the specs, although one of the contactors for sale also uses 230v for the control so I assume it's compatible.

4. There are two white wires which enter the "EH-04 auxiliary contact block" and connect on the PCB, but I cannot see the purpose of these and they are not labeled in the installation guide. Any idea what are they for? 

5. Just out of interest in the existing set up the 3 phase wires and Neutral also connect to the PCB. Any clue as to why this might be? Some sort of monitoring? I note that the OpenEVSE board does not do this (although there are two connections AC_TEST 1 & 2).

6. There is an existing Ground Fault Measurement Coil (not really visible in the photos). Can this be reused? Is there anything specific to the one that I could buy from the shop?


Thanks in advance

Kevin

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