Intelligent Octopus Go limiting cheap charging.

MeteredOut

MWT said:

MeteredOut said:

MWT said:

QrizB said:

MeteredOut said:

Octopus have stated measurement period for 6 hours is midday - midday.

If they've said that, there's two possibilities:

- They've given it less thought than I gave it when writing my reply; or

- They've worked it all out and just haven't told us the details yet.

Take your pick.

Midday - midday is not in doubt, Phil Steele (Octopus) has confirmed it multiple times. 

They have not released the details yet on 'how' but it is trivial to flip the rate for an 'excess' HH period to peak and they rebate based metered use in the HH minus the IOG completed dispatch for that period. 

Could alternatively use data from the EVSE or EV which would in most cases deliver an even lower cost.

Solar is not an issue at that time of day, so that just leaves people who allow their home batteries to discharge in that period which is also likely to be a very low number, but in that case they could assume that the amount to charge at the higher rate would be the lower of the metered use in the period and the reported use by the EV/EVSE perhaps...

But people would then be paying for some EV usage at peak rate, since what the car or charger reports as provided to the car is less that what will have been measured as consumed at the meter during the same period of time, due to charging losses (AC/DC conversion at the car, heat losses). These losses can be 10-20% (higher levels for granny charging).

So, in my 01:00 - 02:00 example above, that whole period would show as peak rate on the bill, but while, eg,  10kWh might delivered to the car, what the car will say as received is less, so the customer ends up paying peak rate for the difference. In effect, some house usage is being charged at peak during 23:30 - 05:30 due to the inaccuracies in the data Octopus have. I'm not 100% sure all the various chargers/car integrations even give half-hourly energy usage. which is what Octopus will require (but I'm sure they've checked this).

The aim is for the EV to be paying at the peak rate so if they charge a little less than they should it errs on the side of the customer.

This mechanism is in place to charge peak rate when the EV is charging beyond the 6 hours allowed even if it is in the overnight low-rate period...

The other home use remains at the default rate for the time of day if the EV charging exceeds 6 hours.

But it won't err on the side of the customer.

Let's say the 6 hours smart charging have been used before 23:30, and another one 30 mins is used 01:00-01:30

During that time, 6kWh is sent to the car, but the car only registers 5kWh due to losses. Alongside that, general house usage is 1kWh. So, total smart meter usage is 7kWh. Let's say peak rate is 30p.

• Bill will have 7kWh @ 30p (peak rate), with a bill credit of 5kWh (what Octopus thinks was used) @ 23p (peak rate - 7p)
• Customer is billed 95p

• Whereas Bill should be 7kWh @ 39p (peak rate), with a bill credit of 6kWh (actual car usage) @ 23p (peak - 7p)
• Customer should have been billed 72p

The customer will pay peak rate instead of 7p for all charging losses in the EV charging process.

This assumes they plan to use bill credits for the "over 6 hours smart charging" billing.
 

MeteredOut

I've just been doing some reading. It seems there are some MID-certified chargers, and energy suppliers can use those to bill, but chargers that are not MID-certified, and granny charges, cannot be used for direct billing.

MWT

MeteredOut said:

MWT said:

MeteredOut said:

MWT said:

QrizB said:

MeteredOut said:

Octopus have stated measurement period for 6 hours is midday - midday.

If they've said that, there's two possibilities:

- They've given it less thought than I gave it when writing my reply; or

- They've worked it all out and just haven't told us the details yet.

Take your pick.

Midday - midday is not in doubt, Phil Steele (Octopus) has confirmed it multiple times. 

They have not released the details yet on 'how' but it is trivial to flip the rate for an 'excess' HH period to peak and they rebate based metered use in the HH minus the IOG completed dispatch for that period. 

Could alternatively use data from the EVSE or EV which would in most cases deliver an even lower cost.

Solar is not an issue at that time of day, so that just leaves people who allow their home batteries to discharge in that period which is also likely to be a very low number, but in that case they could assume that the amount to charge at the higher rate would be the lower of the metered use in the period and the reported use by the EV/EVSE perhaps...

But people would then be paying for some EV usage at peak rate, since what the car or charger reports as provided to the car is less that what will have been measured as consumed at the meter during the same period of time, due to charging losses (AC/DC conversion at the car, heat losses). These losses can be 10-20% (higher levels for granny charging).

So, in my 01:00 - 02:00 example above, that whole period would show as peak rate on the bill, but while, eg,  10kWh might delivered to the car, what the car will say as received is less, so the customer ends up paying peak rate for the difference. In effect, some house usage is being charged at peak during 23:30 - 05:30 due to the inaccuracies in the data Octopus have. I'm not 100% sure all the various chargers/car integrations even give half-hourly energy usage. which is what Octopus will require (but I'm sure they've checked this).

The aim is for the EV to be paying at the peak rate so if they charge a little less than they should it errs on the side of the customer.

This mechanism is in place to charge peak rate when the EV is charging beyond the 6 hours allowed even if it is in the overnight low-rate period...

The other home use remains at the default rate for the time of day if the EV charging exceeds 6 hours.

But it won't err on the side of the customer.

Let's say the 6 hours smart charging have been used before 23:30, and another one 30 mins is used 01:00-01:30

During that time, 6kWh is sent to the car, but the car only registers 5kWh due to losses. Alongside that, general house usage is 1kWh. So, total smart meter usage is 7kWh. Let's say peak rate is 30p.

• Bill will have 7kWh @ 30p (peak rate), with a bill credit of 5kWh (what Octopus thinks was used) @ 23p (peak rate - 7p)
• Customer is billed 95p

• Whereas Bill should be 7kWh @ 39p (peak rate), with a bill credit of 6kWh (actual car usage) @ 23p (peak - 7p)
• Customer should have been billed 72p

The customer will pay peak rate instead of 7p for all charging losses in the EV charging process.

This assumes they plan to use bill credits for the "over 6 hours smart charging" billing.
 

Clearly there is much to work out, but Octopus already estimate the losses and allow for those when working out how much to send to the car in the first place, so no reason why that can't be applied here too, but we really just have to wait and see if they actually have a workable 'fair' method for handling this.

MeteredOut

MWT said:

MeteredOut said:

MWT said:

MeteredOut said:

MWT said:

QrizB said:

MeteredOut said:

Octopus have stated measurement period for 6 hours is midday - midday.

If they've said that, there's two possibilities:

- They've given it less thought than I gave it when writing my reply; or

- They've worked it all out and just haven't told us the details yet.

Take your pick.

Midday - midday is not in doubt, Phil Steele (Octopus) has confirmed it multiple times. 

They have not released the details yet on 'how' but it is trivial to flip the rate for an 'excess' HH period to peak and they rebate based metered use in the HH minus the IOG completed dispatch for that period. 

Could alternatively use data from the EVSE or EV which would in most cases deliver an even lower cost.

Solar is not an issue at that time of day, so that just leaves people who allow their home batteries to discharge in that period which is also likely to be a very low number, but in that case they could assume that the amount to charge at the higher rate would be the lower of the metered use in the period and the reported use by the EV/EVSE perhaps...

But people would then be paying for some EV usage at peak rate, since what the car or charger reports as provided to the car is less that what will have been measured as consumed at the meter during the same period of time, due to charging losses (AC/DC conversion at the car, heat losses). These losses can be 10-20% (higher levels for granny charging).

So, in my 01:00 - 02:00 example above, that whole period would show as peak rate on the bill, but while, eg,  10kWh might delivered to the car, what the car will say as received is less, so the customer ends up paying peak rate for the difference. In effect, some house usage is being charged at peak during 23:30 - 05:30 due to the inaccuracies in the data Octopus have. I'm not 100% sure all the various chargers/car integrations even give half-hourly energy usage. which is what Octopus will require (but I'm sure they've checked this).

The aim is for the EV to be paying at the peak rate so if they charge a little less than they should it errs on the side of the customer.

This mechanism is in place to charge peak rate when the EV is charging beyond the 6 hours allowed even if it is in the overnight low-rate period...

The other home use remains at the default rate for the time of day if the EV charging exceeds 6 hours.

But it won't err on the side of the customer.

Let's say the 6 hours smart charging have been used before 23:30, and another one 30 mins is used 01:00-01:30

During that time, 6kWh is sent to the car, but the car only registers 5kWh due to losses. Alongside that, general house usage is 1kWh. So, total smart meter usage is 7kWh. Let's say peak rate is 30p.

• Bill will have 7kWh @ 30p (peak rate), with a bill credit of 5kWh (what Octopus thinks was used) @ 23p (peak rate - 7p)
• Customer is billed 95p

• Whereas Bill should be 7kWh @ 39p (peak rate), with a bill credit of 6kWh (actual car usage) @ 23p (peak - 7p)
• Customer should have been billed 72p

The customer will pay peak rate instead of 7p for all charging losses in the EV charging process.

This assumes they plan to use bill credits for the "over 6 hours smart charging" billing.
 

Clearly there is much to work out, but Octopus already estimate the losses and allow for those when working out how much to send to the car in the first place, so no reason why that can't be applied here too, but we really just have to wait and see if they actually have a workable 'fair' method for handling this.

Agreed. I can fully see why they've made the change. The CEOs video on YouTube was very transparent.

matt_drummer

MeteredOut said:

MWT said:

MeteredOut said:

MWT said:

QrizB said:

MeteredOut said:

Octopus have stated measurement period for 6 hours is midday - midday.

If they've said that, there's two possibilities:

- They've given it less thought than I gave it when writing my reply; or

- They've worked it all out and just haven't told us the details yet.

Take your pick.

Midday - midday is not in doubt, Phil Steele (Octopus) has confirmed it multiple times. 

They have not released the details yet on 'how' but it is trivial to flip the rate for an 'excess' HH period to peak and they rebate based metered use in the HH minus the IOG completed dispatch for that period. 

Could alternatively use data from the EVSE or EV which would in most cases deliver an even lower cost.

Solar is not an issue at that time of day, so that just leaves people who allow their home batteries to discharge in that period which is also likely to be a very low number, but in that case they could assume that the amount to charge at the higher rate would be the lower of the metered use in the period and the reported use by the EV/EVSE perhaps...

But people would then be paying for some EV usage at peak rate, since what the car or charger reports as provided to the car is less that what will have been measured as consumed at the meter during the same period of time, due to charging losses (AC/DC conversion at the car, heat losses). These losses can be 10-20% (higher levels for granny charging).

So, in my 01:00 - 02:00 example above, that whole period would show as peak rate on the bill, but while, eg,  10kWh might delivered to the car, what the car will say as received is less, so the customer ends up paying peak rate for the difference. In effect, some house usage is being charged at peak during 23:30 - 05:30 due to the inaccuracies in the data Octopus have. I'm not 100% sure all the various chargers/car integrations even give half-hourly energy usage. which is what Octopus will require (but I'm sure they've checked this).

The aim is for the EV to be paying at the peak rate so if they charge a little less than they should it errs on the side of the customer.

This mechanism is in place to charge peak rate when the EV is charging beyond the 6 hours allowed even if it is in the overnight low-rate period...

The other home use remains at the default rate for the time of day if the EV charging exceeds 6 hours.

But it won't err on the side of the customer.

Let's say the 6 hours smart charging have been used before 23:30, and another one 30 mins is used 01:00-01:30

During that time, 6kWh is sent to the car, but the car only registers 5kWh due to losses. Alongside that, general house usage is 1kWh. So, total smart meter usage is 7kWh. Let's say peak rate is 30p.

• Bill will have 7kWh @ 30p (peak rate), with a bill credit of 5kWh (what Octopus thinks was used) @ 23p (peak rate - 7p)
• Customer is billed 95p

• Whereas Bill should be 7kWh @ 39p (peak rate), with a bill credit of 6kWh (actual car usage) @ 23p (peak - 7p)
• Customer should have been billed 72p

The customer will pay peak rate instead of 7p for all charging losses in the EV charging process.

This assumes they plan to use bill credits for the "over 6 hours smart charging" billing.
 

I think your reasoning is suspect?

Surely you get billed for 7kWh @ 30p and credited for2kWh @ 23p.

You would pay £1.50 for putting 5kWh in the car and 14p for the house use and car charging losses, at total of £1.64

You are paying peak for the car charging, not for the house.

In your example the car charging losses of 1kWh would have cost 7p.

But I don't see why you shouldn't pay for the charging losses at peak rate, they are part of the cost of charging your car whatever the unit rate is. Isn't it obvious that you wouldn't have `lost' 1 kWh if your were not charging the car?

Without charging the car you would have only used 1kWh but charging the car used an extra 6kWh even though only 5kWh made it to the car's battery.

MeteredOut

matt_drummer said:

MeteredOut said:

MWT said:

MeteredOut said:

MWT said:

QrizB said:

MeteredOut said:

Octopus have stated measurement period for 6 hours is midday - midday.

If they've said that, there's two possibilities:

- They've given it less thought than I gave it when writing my reply; or

- They've worked it all out and just haven't told us the details yet.

Take your pick.

Midday - midday is not in doubt, Phil Steele (Octopus) has confirmed it multiple times. 

They have not released the details yet on 'how' but it is trivial to flip the rate for an 'excess' HH period to peak and they rebate based metered use in the HH minus the IOG completed dispatch for that period. 

Could alternatively use data from the EVSE or EV which would in most cases deliver an even lower cost.

Solar is not an issue at that time of day, so that just leaves people who allow their home batteries to discharge in that period which is also likely to be a very low number, but in that case they could assume that the amount to charge at the higher rate would be the lower of the metered use in the period and the reported use by the EV/EVSE perhaps...

But people would then be paying for some EV usage at peak rate, since what the car or charger reports as provided to the car is less that what will have been measured as consumed at the meter during the same period of time, due to charging losses (AC/DC conversion at the car, heat losses). These losses can be 10-20% (higher levels for granny charging).

So, in my 01:00 - 02:00 example above, that whole period would show as peak rate on the bill, but while, eg,  10kWh might delivered to the car, what the car will say as received is less, so the customer ends up paying peak rate for the difference. In effect, some house usage is being charged at peak during 23:30 - 05:30 due to the inaccuracies in the data Octopus have. I'm not 100% sure all the various chargers/car integrations even give half-hourly energy usage. which is what Octopus will require (but I'm sure they've checked this).

The aim is for the EV to be paying at the peak rate so if they charge a little less than they should it errs on the side of the customer.

This mechanism is in place to charge peak rate when the EV is charging beyond the 6 hours allowed even if it is in the overnight low-rate period...

The other home use remains at the default rate for the time of day if the EV charging exceeds 6 hours.

But it won't err on the side of the customer.

Let's say the 6 hours smart charging have been used before 23:30, and another one 30 mins is used 01:00-01:30

During that time, 6kWh is sent to the car, but the car only registers 5kWh due to losses. Alongside that, general house usage is 1kWh. So, total smart meter usage is 7kWh. Let's say peak rate is 30p.

• Bill will have 7kWh @ 30p (peak rate), with a bill credit of 5kWh (what Octopus thinks was used) @ 23p (peak rate - 7p)
• Customer is billed 95p

• Whereas Bill should be 7kWh @ 39p (peak rate), with a bill credit of 6kWh (actual car usage) @ 23p (peak - 7p)
• Customer should have been billed 72p

The customer will pay peak rate instead of 7p for all charging losses in the EV charging process.

This assumes they plan to use bill credits for the "over 6 hours smart charging" billing.
 

I think your reasoning is suspect?

Surely you get billed for 7kWh @ 30p and credited for2kWh @ 23p.

You are paying peak for the car charging, not for the house.

In your example the car charging losses of 1kWh would have cost 7p.

But I don't see why you shouldn't pay for the charging losses at peak rate, they are part of the cost of charging your car whatever the unit rate is. Isn't it obvious that you wouldn't have `lost' 1 kWh if your were not charging the car?

Without charging the car you would have only used 1kWh but charging the car used an extra 6kWh even though only 5kWh made it to the car's battery.

Yes, you're right, I got things the wrong way around. It will err on side of customer (apologies @MWT).

I agree charging losses should be at the same rate at whatever energy goes into the car is charged at.