13Amp 3 pin Charging

[Davidscott001]

Hi I have been charging my MG HS Phev for several months on a 3pin 13Amp charger. It's all of a sudden started to only charge at 8Amps where before it was running at 13Amps anyone know why this is? Is there a setting to change?

 

[Jomarkh]

If it is thecsame as my MG5 'granny' EVSE then it uses a 13A plug socket but draws about 2.2kw which is 10A. Not sure why yours is only 8A but how are you measuring it?

 

[Davidscott001]

On the charger. On pluging in the charger it used to ramp up to 13amps now it only ramps to 8amps and takes longer to charge?

 

[Jomarkh]

Hi, where are you seeing 13A?
It can not pull 13A for hours on end it is only 10A.
What does the voltage rating plate say on the EVSE?

 

[Jto]

Have you got a MG granny charger it will have MG logo on it and 3 LED lights, if you have a screen then I think it’s a none MG one. Some other makes of granny charger can be adjusted to do 8amp 10amp 16amp

 

[Jto]

This is a MG granny charger.

 

[hermitdave]

On the charger. On pluging in the charger it used to ramp up to 13amps now it only ramps to 8amps and takes longer to charge?

It would never ramp up to 13A unless you purchased 3rd post EVSE. 10A is the upper limit.
Hardware limitation of car side is 16A and BMS decides how much power it pulls

 

[TWbm]

This is a MG granny charger.

OK - but where are you seeing the amperage? That looks like mine and there's no screen on it.

 

[Jto]

OK - but where are you seeing the amperage? That looks like mine and there's no screen on it.

You got the wrong person it’s the top post

 

[TWbm]

You got the wrong person it’s the top post

Ah. Bugger.

 

[Jto]

Ha ha ha I would like to know how knows it gone down to 8 amp can only think has a non MG charger.

 

[djenson]

Hi I have been charging my MG HS Phev for several months on a 3pin 13Amp charger. It's all of a sudden started to only charge at 8Amps where before it was running at 13Amps anyone know why this is? Is there a setting to change?

The MG charger charges at a MAX of 10A, see below for why



If the car was charging at 13Amps through the granny, something would have gone wrong. UK sockets are not designed for a consistent 13 amps, and issues such as

-Loose fuse clips causing high resistance --> Lots of heat produced
-Old sockets with poor condition internal contacts causing high resistance --> Lots of heat produced
-1.25mm2 "outdoor" extensions being used that really cant handle 13 Amps --> Potential melted wires
-Ring main in poor/Degraded condition and/or spurs that exceed 13amp load --> Melted wires

Any device that draws 13amps for long periods has a high likelihood of causing melted sockets and plugs, Many examples online of 3000W space heaters and knockoff granny chargers that have a setting for 13Amp's causing this


As for you saying it is now charging at 8A,

a) How are you measuring this?
b) When is the last time a balance charge was done?

 

[hewguy]

I’m not sure about ratings, but, I’ve seen about EV charging that when low on charge, it charges higher until about 80%, then slows down to lower rate, maybe youv’e put it on charge, say to charge 20 miles, high rate, then when its 80%, say 25 miles in “tank”, it slows to even out the battery charge, just a thought.

 

[Jomarkh]

On DC the rate drops but on AC it should draw 7kw until full the balance at 300-500w

 

[hermitdave]

On DC the rate drops but on AC it should draw 7kw until full the balance at 300-500w

Onboard charger is limited to 3.7kW / 16A

 

[Jomarkh]

Sorry forgot it was a PHEV

 

[Davidscott001]

Hi There are some trial and error as I do not have the manual to the N/C charging unit it has an adjustable amp rating by pressing the A button on the box when not charging the car. You can select 8, 10 , 13, and 16 amp. Which explains why my socket had to be replaced as It was on 16amps. All sorted now at 10amps.