Moderator comment - information in this post superseded by post Basic charge point costs
There's been debate about the cheapest way to install a charge point, if not able to take advantage of the OLEV grant (or just if you don't want a smart charge point). I thought I'd try and cost the materials, excluding labour, for a few options. To allow a fair comparison I've assumed a 10m cable run from the incoming supply point to the charge point location, and assumed that SWA cable will be required (it may or may not, depends on the location). All options assume that the incoming supply to the house is TN (either TN-C-S (PME) or TN-S). If the house has a TT supply (only usually applies to older, rural, properties now) then the prices will be different. All options assume that charging at 32 A is required.
Option 1 is to charge using the Tesla supplied UMC, together with the optional 32 A Commando adapter lead, connected to a 32 A interlocked Commando outlet. Protection is via a 40 A Type B RCD, with a 40 A MCB for over-current protection, with an earth electrode being installed close to the vehicle charging point location. Total cost of all materials, including the Tesla 32 A Commando adapter needed, is ~£310
Option 2 is as above, but using an O-PEN device, rather than an earth electrode. Total cost of all materials ~£390
Option 3 uses the cheapest non-tethered charge point I could find, the Qubev unit, that has a Type 2 outlet, plus variable charge current via a switch on the side. This avoids having to use the UMC supplied with the car, plus the Commando adapter lead, and can be used with the Type 2 lead supplied with the car. If this is installed with an earth electrode etc, as per Option 1 above (essentially just swapping the interlocked Commando for the Qubev charge point) then the total cost of all materials comes to ~£459
Option 4 is the same as Option 3, but uses the version of the Qubev that has 18th Ed Amdt 1 protection, so avoids the need to use a Type B RCD. Total cost of materials comes to ~£426
Option 5 is the same as Option 4, but uses an O-PEN device instead of using an earth rod. Total cost of materials comes to ~£506
Best price for a 40 A Type B RCD I can find is £114 inc VAT, from here: Type B RCD / RCCB 40A for EV Charge Point Installations. 2 pole, single phase, 30ma. 40 Amp
The same supplier offers a metal enclosure, fitted with this RCD, together with both a 40 A and 6 A MCB, for £179, which is perhaps £20 more than the cost of the individual parts, but looks to be a neat enough option.
All the prices above include the cost of Henley blocks, a metre of tails, cable glands, cleats, short lengths of additional CPC, etc.
Overall, the cheapest option is to install a 32 A interlocked Commando, although that option means using the UMC supplied with the car, plus the optional 32 A Commando adapter, all the time. This has the advantage of having a "Tesla button" on the connector, but the disadvantage that the UMC will need to be supported on something, as it can't safely hang from it's lead for long periods, I think.
If I was on a tight budget, I'd be inclined to go for Option 4 above. It has the advantages of being fairly neat, having switched charge power levels and not needing to use the UMC. The additional cost of ~£116 seems worth it to me.
Labour will vary a great deal depending on location and how easy it is to run cables etc. Around here a typical day rate for an electrician is now around £220, plus VAT in most cases. A typical installation shouldn't really take longer than about half a day, although it would be normal to charge more than just half a day's labour, unless the person had another small job to go to for the other half of the day.
Smart charge points, as required in order to claim the OLEV grant, are more expensive, with a total material cost of typically £200 or so higher than the costs above.
There's been debate about the cheapest way to install a charge point, if not able to take advantage of the OLEV grant (or just if you don't want a smart charge point). I thought I'd try and cost the materials, excluding labour, for a few options. To allow a fair comparison I've assumed a 10m cable run from the incoming supply point to the charge point location, and assumed that SWA cable will be required (it may or may not, depends on the location). All options assume that the incoming supply to the house is TN (either TN-C-S (PME) or TN-S). If the house has a TT supply (only usually applies to older, rural, properties now) then the prices will be different. All options assume that charging at 32 A is required.
Option 1 is to charge using the Tesla supplied UMC, together with the optional 32 A Commando adapter lead, connected to a 32 A interlocked Commando outlet. Protection is via a 40 A Type B RCD, with a 40 A MCB for over-current protection, with an earth electrode being installed close to the vehicle charging point location. Total cost of all materials, including the Tesla 32 A Commando adapter needed, is ~£310
Option 2 is as above, but using an O-PEN device, rather than an earth electrode. Total cost of all materials ~£390
Option 3 uses the cheapest non-tethered charge point I could find, the Qubev unit, that has a Type 2 outlet, plus variable charge current via a switch on the side. This avoids having to use the UMC supplied with the car, plus the Commando adapter lead, and can be used with the Type 2 lead supplied with the car. If this is installed with an earth electrode etc, as per Option 1 above (essentially just swapping the interlocked Commando for the Qubev charge point) then the total cost of all materials comes to ~£459
Option 4 is the same as Option 3, but uses the version of the Qubev that has 18th Ed Amdt 1 protection, so avoids the need to use a Type B RCD. Total cost of materials comes to ~£426
Option 5 is the same as Option 4, but uses an O-PEN device instead of using an earth rod. Total cost of materials comes to ~£506
Best price for a 40 A Type B RCD I can find is £114 inc VAT, from here: Type B RCD / RCCB 40A for EV Charge Point Installations. 2 pole, single phase, 30ma. 40 Amp
The same supplier offers a metal enclosure, fitted with this RCD, together with both a 40 A and 6 A MCB, for £179, which is perhaps £20 more than the cost of the individual parts, but looks to be a neat enough option.
All the prices above include the cost of Henley blocks, a metre of tails, cable glands, cleats, short lengths of additional CPC, etc.
Overall, the cheapest option is to install a 32 A interlocked Commando, although that option means using the UMC supplied with the car, plus the optional 32 A Commando adapter, all the time. This has the advantage of having a "Tesla button" on the connector, but the disadvantage that the UMC will need to be supported on something, as it can't safely hang from it's lead for long periods, I think.
If I was on a tight budget, I'd be inclined to go for Option 4 above. It has the advantages of being fairly neat, having switched charge power levels and not needing to use the UMC. The additional cost of ~£116 seems worth it to me.
Labour will vary a great deal depending on location and how easy it is to run cables etc. Around here a typical day rate for an electrician is now around £220, plus VAT in most cases. A typical installation shouldn't really take longer than about half a day, although it would be normal to charge more than just half a day's labour, unless the person had another small job to go to for the other half of the day.
Smart charge points, as required in order to claim the OLEV grant, are more expensive, with a total material cost of typically £200 or so higher than the costs above.
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