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PV and battery long payback - sense check query

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Transparent
(@transparent)
Illustrious Member Moderator
Joined: 5 years ago
Posts: 3389
 

I'm just picking this up from your original post.

Posted by: @davidb

The EV will be charged using a dedicated 13amp socket and the vehicle systems used to control charging etc.

 

If the EV socket is dedicated, then you don't need to be limited to 13A. 

I have a 32A external "Commando" socket supplied direct from the consumer unit via a Type-B RCD.

Cable3b
Trips

Save energy... recycle electrons!


   
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JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 5357
 

Posted by: @transparent

I'm just picking this up from your original post.

Posted by: @davidb

The EV will be charged using a dedicated 13amp socket and the vehicle systems used to control charging etc.

 

If the EV socket is dedicated, then you don't need to be limited to 13A. 

I have a 32A external "Commando" socket supplied direct from the consumer unit via a Type-B RCD.

Cable3b
Trips

I can see that from an electrical regs PoV thats true, but is there any minimum functionality in a car charger that is required (other than to supply electricity).  I thought that there was some sort of comms protocol but it may not be necessary.  I guess that, since yours is labelled EV Charge point its presumably what you use it for and the answer must therefore be 'no' which makes you wonder why we all buy expensive highly functional dedicated chargers (answer - because thats what the market wants to sell)

 


This post was modified 3 weeks ago by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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Majordennisbloodnok
(@majordennisbloodnok)
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Joined: 5 years ago
Posts: 2113
 

There's an article here on using a commando socket instead of a wallbox.

From a practicality viewpoint, a commando socket is either on or off; either you're charging at 32A or you're not. Moreover, there's no control over it as such which a wallbox can provide (schedules, integration with tariffs etc.). In both of these cases, @davidb has already said he's OK with accepting these limitations at 16A so switching from a 3-pin socket to a commando socket won't change his basic plan other than allowing quicker charging.

Now, I wonder if you can buy a 32A smart commando socket.... 🤔 


105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
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(@etchedpixels)
Estimable Member Member
Joined: 3 months ago
Posts: 152
 

Posted by: @majordennisbloodnok

There's an article here on using a commando socket instead of a wallbox.

From a practicality viewpoint, a commando socket is either on or off; either you're charging at 32A or you're not. Moreover, there's no control over it as such which a wallbox can provide (schedules, integration with tariffs etc.). In both of these cases, @davidb has already said he's OK with accepting these limitations at 16A so switching from a 3-pin socket to a commando socket won't change his basic plan other than allowing quicker charging.

Now, I wonder if you can buy a 32A smart commando socket.... 🤔 

 

You can get "portable" EV chargers that plug into 16A or 32A commando sockets. They are incredibly useful when the regulatory system has it's head up its arse and you can install a commando socket without hassle but installing an EV charger requires a ton of mess because of conservation zones, listed buildings or other regulatory hassles.

 

 

 



   
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JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 5357
 

Posted by: @majordennisbloodnok

Now, I wonder if you can buy a 32A smart commando socket.... 🤔 

Quite probably not, but you can get a 32A relay and a Shelley device to switch it.  I switched my 13A EV socket with a 16A Shelley relay for a while, I dont think the do a 32A one but others do.

 

Posted by: @etchedpixels

 

You can get "portable" EV chargers that plug into 16A or 32A commando sockets. They are incredibly useful when the regulatory system has it's head up its arse and you can install a commando socket without hassle but installing an EV charger requires a ton of mess because of conservation zones, listed buildings or other regulatory hassles.

 

Im sure that the government at the time was lobbied by MCS and other such bodies, supported probably by the fossil industry, to put 'rules' around renewable technologies.  MCS et al want rules so they can protect their commercial positions, and the fossil industry want rules to make it more difficult to wean ourself off.  It seems to be the fate of new technologies that they dont by default get the 'grandfather rights' of the technology they are replacing and of course where there are vested interests they almost inevitably have an influence until someone both 'sees through them' and is actually minded to change things.

The current government is slowly relaxing the unnecessary rules, the May 2025 update to planning regs went quite a long way and the recent moves towards allowing plug in solar is a siginficant stand against vested industry lobbying, albeit that we all hope it will be extended to batteries quickly.


This post was modified 3 weeks ago 2 times by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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Batpred
(@batpred)
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Posted by: @jamespa

It seems to be the fate of new technologies that they dont by default get the 'grandfather rights' of the technology they are replacing and of course where there are vested interests they almost inevitably have an influence until someone both 'sees through them' and is actually minded to change things.

A really nice way to put it! 

Even if it is not much consolation when I look at the more than half a dozen certificates and the like for our install. Not even counting manuals! 

Posted by: @jamespa

The current government is slowly relaxing the unnecessary rules, the May 2025 update to planning regs went quite a long way and the recent moves towards allowing plug in solar is a siginficant stand against vested industry lobbying, albeit that we all hope it will be extended to batteries quickly.

Agree, the pace is not impressive, but it is steadily changing. It seems the principle of affordability is finally being given some importance. 

 


8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kW export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; Vaillant Arotherm Pro 7kW; 100Amp head, HA lab on mini PC


   
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JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 5357
 

Posted by: @batpred

 

 

Posted by: @jamespa
↑

The current government is slowly relaxing the unnecessary rules, the May 2025 update to planning regs went quite a long way and the recent moves towards allowing plug in solar is a siginficant stand against vested industry lobbying, albeit that we all hope it will be extended to batteries quickly.

 

 

Agree, the pace is not impressive, but it is steadily changing. It seems the principle of affordability is finally being given some importance. 

Having spend 14 years in local government (after 30 years in engineering) I know how slowly things move and also know that, if you try to speed them up unduly, you risk being subjected to a Judicial Review because of some self-interested person(s), further delaying things by a couple of years or more.

Of course there are politicians that advocate eliminating or reducing the extent that government decisions can be challenged through the courts; those same politicians also advocate withdrawing from human rights protection and only appointing civil servants that agree with their ideology.  There is a theme here of which you may or may not approve.

 


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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Batpred
(@batpred)
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Joined: 2 years ago
Posts: 1132
 

@jamespa 

I was just commenting on the speed, not suggesting shortcutting due process. 

Moving slowly seems to make it predictable, a benefit on its own! 


8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kW export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; Vaillant Arotherm Pro 7kW; 100Amp head, HA lab on mini PC


   
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