(I've started this thread here as it seems the most relevant place. It comes from a few postings I've made in other people's topics and is a sort of fresh start, now that I've learned a few things from SEVers. Thanks all.)
Starting from the beginning, this is the three-phase supply I have:
I had planned to have a 22kW charger (mostly for future-proofing as I will be leasing an 7kW-AC charging Ioniq for two years). The complications come from being unable to add an earth electrode by the charge point location (for a TT island). The front of the unit looks like this:
As you can see, the only location in on the brick pillar between the two doors. That's perfect for charging a car in either of the allocated spaces, but the incoming gas supply and other services (telephone, water in and drainage out) all run somewhere along and in front of the building.
So, thanks to Mike for posting about the other options:
Option 2: As I understand it, the Matt-e is a bigger connection box at the incoming supply, handles the PEN-loss issue for a 3-phase supply (not just a single phase) and its 3-phase output would run to the front wall and then could be a 'dumb' charge point with Type 2 outlet. The car will have the charging schedule smarts, and I would not be using an OLEV grant because that requires a smart charge point (like Zappi, Indra, EVline). For this I would need a competent/qualified electrician - not an OLEV-compliant installer.
Option 3: Quotes for the full install (all 22kW Zappi) are £1200-1500. The Indra seems to be 7kW only. There's also the EVline 300 for 22kW and with their 'Safevolt' PEN-loss protection. Still researching that one.
I'm tempted by Option 2 at the moment. Any reality checks?
(There is the question about what sorts of protection devices are required in the 'dumb box'. I've got to wise up on that.)
Starting from the beginning, this is the three-phase supply I have:
I had planned to have a 22kW charger (mostly for future-proofing as I will be leasing an 7kW-AC charging Ioniq for two years). The complications come from being unable to add an earth electrode by the charge point location (for a TT island). The front of the unit looks like this:
As you can see, the only location in on the brick pillar between the two doors. That's perfect for charging a car in either of the allocated spaces, but the incoming gas supply and other services (telephone, water in and drainage out) all run somewhere along and in front of the building.
So, thanks to Mike for posting about the other options:
So I'm now looking at those second and third options.That's a 3 phase TN supply.
You'll likely need either:
To tt island each EVSE and manage sim contact risks manually.- A 3 phase upstram protection device, e.g. Matt:e O-PEN.
- an EVSE that works under indent (iii) or (v), e.g. myenergi Zappi or Indra Smart PRO.
Option 2: As I understand it, the Matt-e is a bigger connection box at the incoming supply, handles the PEN-loss issue for a 3-phase supply (not just a single phase) and its 3-phase output would run to the front wall and then could be a 'dumb' charge point with Type 2 outlet. The car will have the charging schedule smarts, and I would not be using an OLEV grant because that requires a smart charge point (like Zappi, Indra, EVline). For this I would need a competent/qualified electrician - not an OLEV-compliant installer.
Option 3: Quotes for the full install (all 22kW Zappi) are £1200-1500. The Indra seems to be 7kW only. There's also the EVline 300 for 22kW and with their 'Safevolt' PEN-loss protection. Still researching that one.
I'm tempted by Option 2 at the moment. Any reality checks?
(There is the question about what sorts of protection devices are required in the 'dumb box'. I've got to wise up on that.)