New poster here, I have a Mercedes a250e on order for next March and so I’m now looking into a charger. Firstly I should explain that I have separate garage fed by an underground cable. In readiness for the charger I have had the cable replaced from the main CU to the rear of the property (junction box) and then onto the garage with 10mm cable. I have also had a new CU and isolator switch fitted in the garage. Now I am in touch with various charger suppliers/installers. My question is regarding the CT clamps that I am reading about, it is not practical to run a cable from the meter box or the main CU to the charger. Are CT clamps a necessity or just an option? If they are required then my only option is WiFi using a Harvi, this is offered with the Zappi but is it offered by other EV charger manufacturers? One final question, does the Harvi CT clamp talk directly to the charger or does it require a hub? I currently use Hive for my CH and controlling lights so their offering is of interest but the same questions apply. Sorry for the long post, look forward to hearing your replies.
Iansums
Why do you need a CT clamp for the OZEV (neé OLEV) grant? The OP may need one to restrict the total load but that's a different issue. OZEV have an obsession with "smart" but that's for different reasons.
It's only required when the current drawn by the car could take the theoretical total drawn by the house above the limit imposed by the supply fuse. You really need to get a decent charge point installer to advise as the calculation involves looking at all of the other electrical loads in the house, applying diversity where appropriate, and finding out what the incoming limit is, what fuse is actually fitted, and possibly negotiating with the DNO to get it raised.
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