MG4 SE battery 1year SoH

[Everest]

I still sort of admire the evil genius of programming a car to recognise when it is being emissions tested and temporarily remapping itself to pass the test.

Well, technically it can pass the test, though not 'in the spirit' of the rules.

You can automate it using home assistant apparently but I can’t be bothered to sort that out yet. Probably will do eventually but need to buy things and do loads of research to make it happen!

Was thinking similar. But do you ever need to charge EV from batteries? If not, is positioning the inverter's grid CT clamp between the EV charger and CU an option, or does the EV feed from the CU?

 

[unbornidentity]

Well, technically it can pass the test, though not 'in the spirit' of the rules.


Was thinking similar. But do you ever need to charge EV from batteries? If not, is positioning the inverter's grid CT clamp between the EV charger and CU an option, or does the EV feed from the CU?

The inverter CT clap is buried in the CU and my charge point installer decided not to fit the CT clamp for my charger. I might get the charger installer back out to fit it though as Ohme now supports solar and that functionality can’t work without the CT clamp.

As it is everything feeds from the CU. I’d never want to charge my car from the house battery as it’s too small, my export rate is 15p and IOG is 7p. But if rates change and using solar to charge the car becomes the better option I might use the house battery as a buffer.

 

[Tight Git]

Assuming a 90% efficiency from my Zappi charger last night charged from 6% to full gave me a 100% capacity of 50.2kWh.

SE SR with 42,000 miles for reference.

 

[clipdawg05]

Assuming a 90% efficiency from my Zappi charger last night charged from 6% to full gave me a 100% capacity of 50.2kWh.

SE SR with 42,000 miles for reference.

I have 4780km on the odometer. Charged from 1%. Assuming 90% efficiency from my charger I have a capacity of 49.2 kWh. I'm not really happy with it. I did the same test 3 weeks ago and I lost .8 kWh of capacity.

 

[Everest]

Assuming a 90% efficiency from my Zappi charger

The pedant in me wants to add that a Zappi or other home-based AC connection point is just that.... an EVSE... EV Supply Equipment. It is not a "charger" and does not itself have losses. There will be small losses in the wires leading to the Zappi and some more in the wires in the AC charging cable.

The main losses and approx. 90% efficiency will be in the AC charger itself, which is part of the MG.

 

[siteguru]

If you have both apps (iSmart and one for your EVSE) you can monitor ongoing charge rate and compare ... in my case iSmart will typically show 6.4-6.5kW into the battery, and the Wallbox app will typically show 7.2kW being delivered, so 700-800W in losses or 89-90% efficiency.

 

[clipdawg05]

If you have both apps (iSmart and one for your EVSE) you can monitor ongoing charge rate and compare ... in my case iSmart will typically show 6.4-6.5kW into the battery, and the Wallbox app will typically show 7.2kW being delivered, so 700-800W in losses or 89-90% efficiency.

Yeah mine is usually 7.1 And 6.4

 

[Romeo77]

Haha, well if they tried something sneaky like that it would become obvious when no battery ever dropped below 70% under the mileage limit and they’d be risking a VW diesel gate type law suit.

I still sort of admire the evil genius of programming a car to recognise when it is being emissions tested and temporarily remapping itself to pass the test.

You can automate it using home assistant apparently but I can’t be bothered to sort that out yet. Probably will do eventually but need to buy things and do loads of research to make it happen!

It’s kinda funny thinking back at reading that link how easily I understood the code. Fair enough it wasn’t complicated but I’ve not written code for ages but read that like I was reading a normal sentence! I’d probably have struggled to write it though

Usually SOH that tech can see during service is from OEM tablet
And may differ from what we can see in Car Scanner
That because almost always real cells capacity higher then advertised but degradation in OEM tablet judging by comparing advertised and nominal capacity not from factory capacity that always higher !!!!
In my case advertised 150 ah but factory capacity is 153 ah, so if nominal capacity is 150 ah then SOH that tech will see is 100%