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%.