MG5 Pre-facelift V2L (Diy)

[staarek]

As we know there's no V2L capability on Pre-lift MG5, so I decided to do a DIY version. The onboard charger is capable of delivering around 170amps to 12V battery, however the charging circuit fuse is 150amps, so we are looking at maximum 2.1kw max. I bought 2kw pure sine wave inverter, as I don't think i will be ever drawing more than 1.5kw. So far I tested it on 900w heater and it seems all good, the charger adjusts the current accordingly to the demand (i checked with amp meter). The maximum current i saw on the dashboard was 3 amp (3 x 400v = 1200w)

Link to a short video below:

 

[Gomev]

Have you taken that directly from the 12v battery connections ?

 

[staarek]

Have you taken that directly from the 12v battery connections ?

Yes, that's right.

 

[MickeySw]

As we know there's no V2L capability on Pre-lift MG5, so I decided to do a DIY version. The onboard charger is capable of delivering around 170amps to 12V battery, however the charging circuit fuse is 150amps, so we are looking at maximum 2.1kw max. I bought 2kw pure sine wave inverter, as I don't think i will be ever drawing more than 1.5kw. So far I tested it on 900w heater and it seems all good, the charger adjusts the current accordingly to the demand (i checked with amp meter). The maximum current i saw on the dashboard was 3 amp (3 x 400v = 1200w)

Link to a short video below:

No doubt this will work, not sure though, if the CCU is designed to continuously deliver 1.5kW as the 12V aux is usually kept topped up?

 

[Gomev]

No doubt this will work, not sure though, if the CCU is designed to continuously deliver 1.5kW as the 12V aux is usually kept topped up?

But it's bypassing the CCU by taking the feed direct from the 12v battery. This is the same as the setup in my shed. One PV panel on the roof, a leisure battery and an inverter connected to the battery which powers my tools etc.
Hopefully the car is in ready mode so that it's keeping the 12v topped up as the car 12v battery is not designed for this type of usage.

 

[staarek]

No doubt this will work, not sure though, if the CCU is designed to continuously deliver 1.5kW as the 12V aux is usually kept topped up?

True, so far i just tried 900w heater for about 15 minutes but hard to tell how is it going to be ina long run...

But it's bypassing the CCU by taking the feed direct from the 12v battery. This is the same as the setup in my shed. One PV panel on the roof, a leisure battery and an inverter connected to the battery which powers my tools etc.
Hopefully the car is in ready mode so that it's keeping the 12v topped up as the car 12v battery is not designed for this type of usage.

That's right, the car is "on" (started with a foot on a break) and the 12V battery is being constantly topped up. I check with a clamp meter and the charging current is being adjusted accordingly to the load. I've been "off-grid" for many years - also have a solar panel on the roof of my shed, small battery and an inverter (800w). setup mostly for lights and charging power tools batteries.