Very poor range

[Mazzyh]

It was 133 for 95%

I'm hopeful that it's the driving. It was one return motorway trip of 80 miles and the rest just local rush hour stuff. Motorway at 70 most of the time. Rush hour, stop start for each 6 mile journey.

I've used the Granny but I shall now use the 7kw charger instead. Still got all the cables from the ZS. Charger on wall outside has been off for the last 2 years - hopefully it'll work although it never ever communicated with the app from new. I'll need some way of setting a timer as I've just switched to an EV tariff.

As this is about batteries (albeit range), is the 7kw charger ok to use all the time or should I do the occasional Granny to balance?

 

[m4rmite]

Use the 7kw charger

 

[MG Clive]

As this is about batteries (albeit range), is the 7kw charger ok to use all the time or should I do the occasional Granny to balance?

You can still balance with the 7kW home charger, so you can use it all the time, just keep the Granny for emergencies.

 

[Siloamg]

This post has been of interest to me. There are number of calculations of range as a factor of battery size, efficiency and SOH.

I wrote a simple spreadsheet for myself a while ago to quickly evaluate range based upon battery size, SOH and efficiency which I am posting here in case it is of use to anyone. The sheets are unprotected and hopefully self explanatory.

I offer this calculator 'AS-IS'.

The 'journey calc' sheet I use to get a rough estimate of costs and charging time for a given journey based on SOH, expected efficiency, home charge starting %age, 'home and away' charging costs.
Parameters in yellow are for user entry.

 

[MickeySw]

I'll need some way of setting a timer as I've just switched to an EV tariff.

Thread 'Making my dumb Rolec charger a smart one for under £20'

Nov 14, 2021

I've seen a few comments on posts which have suggested using a Shelly 1 Switch to upgrade a dumb charger to allow timed charging. Well now I've done it and I can confirm:

1. It works
2. It's relatively easy to install (I’m no genius and I did it)
3. Cost me under £20 and saved £800 on purchasing a new smart charger

If you have a dumb charger it's well worth considering.

PS - the Shelly switch doesn’t take the 7kw load of the charger it is only controlling the low voltage switch inside the charger.

This video (not mine) was my guide

• AussiePete
• charger mg zs ev rolec
• Replies: 24
• Forum: General Chat Forum

• 

 

[MickeySw]

I wrote a simple spreadsheet for myself a while ago to quickly evaluate range based upon battery size, SOH and efficiency which I am posting here in case it is of use to anyone.

Nice work, how do you accurately estimate efficiency though?
Ambient temperature is just one factor; others like speed, no of passengers, terrain, weather, driving style etc can have a big effect aslo?

 

[Siloamg]

You are quite correct about those factors that influence efficiency and each person's figures will differ in real time. The range of efficiencies in the spreadsheet are what I have found typical for my own driving experience over the past 3 years of data in my mg5 and each year's figures track pretty consistently by year and month.

In truth I am so used to what the car can and cannot do that I no longer think much about range. I posted this mainly to quantify range for anyone still concerned about the effects of battery condition and vehicle efficiency and want to quantify range.

 

[Gomev]

Hmmm. I was wrong. Just fully charged it from 5% and left it for 36 hours. It's not good. In eco with nothing turned on, it's only 196 miles. That was a surprise because the first time I charged it, it was 200 odd, from memory about 233.

So perhaps I do need to disconnect the battery because this may be the consequences of very short journeys with all the heating on and it's basing it on previous performance.

You can also see how many miles the last full charge gave me and it's pitiful. 133!

Bit disappointed.

You are correct, short journeys with the heating on will kill the range. The heater is constantly trying to get the car up to temperature as opposed to a longer journey where once it's up to temp it only needs to maintain it.
The GOM will only predict based on the recent history, and it is only a prediction not a fact.
Charging to 100% leaving the drive mode in Normal (not Eco) and resetting the Accumulated trip will show a GOM of whatever the WLTP for the car is. If it shows less, then that is the degradation or SOH of the battery. e.g. it shows 225 on a pre-facelift LR (WLTP 250) then that is a SOH of 90%.

 

[skikky]

just skimmed this thread and thought id give my two cents.
i have a pre facelift 72 plate exclusive, and often use aircon heating alongside rear view heater and heated seat.
with the cold, windy, and very wet weather recently ive been getting an average of 2.6mi/kwh this winter, which isnt the best but is what id expect for my more positive driving style. it nets me about 160mi on a chatge.
on the days where the roads have been a bit dryer and a little warmer without the heating on, ive found myself at about 3.2mi/kwh. this gives me closer to 200, which is what mg advertised on their website for my motorway heavy driving.
during summer id usually find myself at 3.8-4.2mi/kwh though, giving me a lovely 230ish range.

its worth mentioning that generally wet and windy conditions in winter just drag down efficiency, with rain being quite the bad one when it comes to it.
in super heavy rain in near zero temps, you can sometimes find yourself below 2mi/kwh, but its somewhat expected given the efficiency in these scenarios

 

[Mazzyh]

Charging to 100% leaving the drive mode in Normal (not Eco) and resetting the Accumulated trip will show a GOM of whatever the WLTP for the car is.

Bit confused here. I thought it was in eco that the full WLTP is shown? I've got nowhere near 250 in normal mode and I had hoped the battery was not too degraded. Based on others responses, I did think I was more or less ok.

My real range in this awful cold and wet weather is about 150 currently. I am using the heater a fair bit and that also includes about 70 miles on the motorway at 70mph most of the way. I had thought it would be better though.

 

[Gomev]

Bit confused here. I thought it was in eco that the full WLTP is shown? I've got nowhere near 250 in normal mode and I had hoped the battery was not too degraded. Based on others responses, I did think I was more or less ok.

My real range in this awful cold and wet weather is about 150 currently. I am using the heater a fair bit and that also includes about 70 miles on the motorway at 70mph most of the way. I had thought it would be better though.

Use Normal mode for WLTP with everything else off such as heating, seats etc. Eco makes it look better, Sport makes it look worse.

 

[MickeySw]

I am using the heater a fair bit and that also includes about 70 miles on the motorway at 70mph most of the way.

Lowering speed is the easiest way to increase range? Try 60mph next time.