Ohme Charging

[ojuk]

Anyone else experienced this.

FYI: With Octopus IG (not sure it makes any difference).

Car at 21% last night. Plugged it in and told it to charge 60%.

Got in the car this morning and it's charged to 90%.

It did the same the other night... even though I am telling the charger to only add 60%.

Anyone got any ideas?

 

[Jomarkh]

Anyone else experienced this.

FYI: With Octopus IG (not sure it makes any difference).

Car at 21% last night. Plugged it in and told it to charge 60%.

Got in the car this morning and it's charged to 90%.

It did the same the other night... even though I am telling the charger to only add 60%.

Anyone got any ideas?

Have you got any screen shots of your home page and routine page?

 

[ojuk]

I'd have to take a screenshot of the home page next time I charge, but I have been doing this each time I plug in rather than set up a routine.

Will give that a go - thanks!

 

[CharlesCarmichael]

I have a OHME home pro, I have noticed the charger and the car have different opinions of how many kW the car is being charged by.

Usually though the car is under what the charger is stating, so OHME will state 7kW but MG will state 6.4kW. This would mean less charge added to me instead of more in my case.

This doesn't happen in our ID4 but there is a data connection between the ID4 and the OHME charger which the MG4 doesn't have.

Can you set the car to 80kWh max so it won't go over the required charge state, mine does this, I can tell it to add 100% in OHME but the car stops charging when it reaches 80%.

is the car saying it is in health mode or long range?

 

[jon0881]

did you tell the car to charge to 60% or the ohme? If its the ohme then it has no clue what charge is in the mg4, just what its delivered

 

[Rolfe]

Octopus do say that they will not exceed the charge limit set in the car. I don't know how that works though - having the SR I always want to go to 100%.

 

[Martinonline]

As I understand it the SR cannot set a charge level so the car will stop any charging at 100%. The Trophy can set a lower charge level and will stop charging at that point (yes there are issues there). So Octopus's statement is correct as long as the EVSE is working correctly.

 

[mg4mc]

Well, it's not really down to the EVSE, that can stay switched on ready to deliver charge forever. The car switches off the charging when it reaches the set limit - or not in this case. There is another current thread on here where someone else was reporting this behaviour and a member said it is a software problem on the car that MG can fix it with an update.

 

[FrancisM]

So can a charging limit be set on the MG4 SE Long range? It has NMC batteries so I'd want to set an 80% limit.

 

[tsedge]

Yes, the way the charging protocol works, the car is in control of terminating the charge session, the EVSE cannot override it. Therefore there's no risk.

The EVSE never knows the SoC of the car, it is a very simple signalling protocol. Charging only starts when the car says, only continues at the level the car wants and ends whenever the car decides it is finished.

Yes, all LR cars should have the ability to set an adjustable charge limit ("Health mode" as the zone is called) so you can always stop charging at 80% whether AC or DC. This is done via the battery charging screen or the app.

 

[CharlesCarmichael]

Yes, the way the charging protocol works, the car is in control of terminating the charge session, the EVSE cannot override it. Therefore there's no risk.

Yes, all LR cars should have the ability to set an adjustable charge limit ("Health mode" as the zone is called) so you can always stop charging at 80% whether AC or DC. This is done via the battery charging screen or the app.

It is on the app and the car, I would trust the car more than I would the app.

 

[tsedge]

It is on the app and the car, I would trust the car more than I would the app.

Both work just fine for me, but yes, with the app you have other potential bugs.

 

[andyvee]

With the Ohme you are setting how many % to ADD to the car - it even says that clearly in the Ohme app 'Charge to Add +xx%'.

So you set it to ADD 60% charge. It is at best a +/-5% accuracy due to Ohme estimating the charge losses so you don't end up short of charge. Charge losses will vary by battery temperature, SoC and charge speed as well.

 

[Koomi]

In the car, set the limit to 80% (in the app, click the battery, click the cog in the top corner, set charge limit)
On the Ohme, set to add 65% (if going from 20->80), IO and the charger will plan to add 65%, the car will stop when it hits 80%

Another thought - is the correct car picked in the Ohme? If you have selected the ER rather than the LR... +60% will be more.

 

[Tig170]

You can also create a user defined battery size & charge rate, on the Ohme app. I don’t like 7kW going in overnight, so have reduced the max charge rate to 3.84 kW.

 

[Slipstream]

Anyone else experienced this.

FYI: With Octopus IG (not sure it makes any difference).

Car at 21% last night. Plugged it in and told it to charge 60%.

Got in the car this morning and it's charged to 90%.

It did the same the other night... even though I am telling the charger to only add 60%.

Anyone got any ideas?

Why don't you set the charging % using the I smart app or can you not do that with the home.

 

[crowe99]

I have Ohme Home Pro and IOG also and I just leave the car on either 70% or 80% max and the Ohme is always left on "add 80%" irrespective of whether I want 5% or the full 80%.

I don't have any routines set on either car or Ohme and so far this has worked perfectly so I would set the max charge on the iSmart app or car and pop the Ohme to 80% and fingers crossed it should work for you.

 

[andyvee]

and the Ohme is always left on "add 80%" irrespective of whether I want 5% or the full 80%.

Oh dear .... How are Octopus supposed to Intelligently map a charge session at the best times to help balance the grid etc. if you ask for 80% of your battery capacity when you only require 5%?

It is fundamental to how IOG works that you set to a reasonable degree of accuracy how much charge you actually require.

 

[Rolfe]

I just got home at nearly 1 am, on 39% battery. I asked Octopus for 65%, and was given a slot starting immediately and running till 6.30 am. I set the house battery to charge till 6.30. Job done.

I see that the car thinks it will be done by 5.50 am, but then it needs some time to balance, so we're all good.

All I need to do now is remember to change the end time of the battery charge back to 5.30 am some time tomorrow.

 

[Rolfe]

I just got home at nearly 1 am, on 39% battery. I asked Octopus for 65%, and was given a slot starting immediately and running till 6.30 am. I set the house battery to charge till 6.30. Job done.

I see that the car thinks it will be done by 5.50 am, but then it needs some time to balance, so we're all good.

All I need to do now is remember to change the end time of the battery charge back to 5.30 am some time tomorrow.