Check out my V2G (Vehicle to grid) installation with OVO Energy!

Here’s the latest import/export figures for our V2G charges - who here has one? You’re part of this! 

Hello All,

Just thought I’d give you an update on the V2G trial.

I took delivery of my 40 kW Nissan LEAF on 29th January, 2018, 23 months ago. The first check I made on the battery’s health was on 1st April 2018 when the car had 1,209 miles on the clock and the battery State of Health was 99.24%

I began the trial on 26th July 2019, almost 18 months after purchase and the state of health was 96.00% and the mileage was 10,990…..so in 18 months the health of the battery had diminished by 3.24%

For the month of August imports and exports were made every day and the SOH  dropped from 95.96% to 95.78%, 0.18% in 1 month.

Today I have just checked the car and after more than 4 months of importing and exporting almost every day the state of health is 94.8% and the mileage is 11,867 so in the last 4 months the state of health has fallen by 1.16%. I suspect that in the summer when the battery temperature was averaging 25C and the outside temperature averaging 21C the wear and tear on the battery was less than in the last few months when the battery and outside temperatures were considerably less...though I have to admit the joy of going in the garage first thing every morning with an OBDII and LEAF spy in my dressing gown was a lot less tedious in August than in December, hence only keeping records for one month. 

July      Import   107.2 kW      Export 114.1 kW

Aug      Import  661.4 kW      Export 598.0 kW

Sept     Import  639.1 kW       Export 489.1 kW

Oct       Import 671.3  kW       Export  555.1 kW

Nov      Import  537.9 kW       Export 486.0 kW

Total    Import  2,616.9 kW     Export 2,242.9 kW

So in summary constant charging and discharging of the battery using the V2G, based purely on the figures given is likely to diminish the life of the battery 3.48% in one year with a mileage half the average. But using the car alone without V2G would be 2.16% in a year. So the wear and tear on the battery would be 1.32% per year from exporting alone, given that you would have to import anyway.

With V2G, after 8 years (period of warranty) the state of health is likely to be 72.16% with V2G and 82.72% without…..something to bear in mind as the warranty limit is 75%

Clearly this is not a scientific evaluation as I have not checked the numbers every day but I hope it may be of use to some of you out there…

Leo

Hi 

I’m very interested in this thread as I am about to have survey carried out at my home with view to joining the trial.  I notice from this thread and youtube that a lot goes into the installation.   I’m just hoping that the fact that my car is parked at back of house and smallish garden when meter is at front of house causes any problems. 

Hi @SimonChurchill thanks for joining the discussion.

Yes, you’ll see a lot of different issues being tackled when you read about the V2G installations. However, it’s worth remembering that that not all of the “fixes” are required at each location. We tend to hear only about those installations where there was something that needed resolving.

The location of your Smart Meter has no bearing on where your charger is to be positioned. The electrical connection runs from your Consumer Unit. Is this adjacent to the meter?

A 7kW charger is protected by a 32A trip. The IET Wiring Regulations specify that this can use a 2.5mm² cable, which is the same size as used for a domestic power ring. This is relatively easy to run.

The Installers will make appropriate choices as to the exact cable when they consider the route to be taken. If required, an external or armoured (SWA) cable can be used. You can safely leave the technicalities to them.

I’m just getting the advice from Transparent double checked, @SimonChurchill 

In the meantime, everyone, check out @D10hul February V2G blog post here