Charging during a Brown Out

[Expat Ever]

Normal mains supply here in Thailand is 220v 50Hz, but this evening it's down to 214-215v - possibly due to the extensive flooding for the past couple of weeks here in Chiang Mai. The meter by my MG wall charger is showing 215V, 30.9A and a charge rate of 6.5kW See attached picture (the kWh figure is this month's consumption to date). Normally it indicates 219-221V / 31A / 6.9kW.
The car is charging but the progress display is behaving oddly with the third quarter green light coming on for only about 1.5 seconds at a time. This was also true for the second quarter indicator.




Does anyone know if a constant lower voltage or a fluctuating (but lower) voltage will cause problems with the battery (currently at 54%) or the charger? Any advice much appreciated.

 

[Bricktop X PWR]

No.
It will just take a little bit longer as expected.

 

[gazza487]

Not sure on the specifics of the MG but it should be fine (unless the power is very very dirty and bouncing up / down etc). Many cars like the Tesla being very American can go from 120v. Generally there is a rectifier circuit that goes AC to DC, then a chipper circuit that turn the DC on and off very quickly to run a transformer to boost to the voltage needed for the batteries, then eventually rectified again. Pretty standard for a switched mode power supply.

I live in a rural ish place so voltage floats around a fair bit - 248v down to around 220 depending on the loads in the village. Sunny days with solar and low load it jumps up. Uk grid voltage limits are a bit odd to conform with the eu and are in the range of 216 to 253 which are deemed perfectly fine.

Unsure of the regulations in your part of the world but good surge protection to the charger and hopefully it is like our smart ones that will disconnect if there is anything even slightly wrong.

 

[Expat Ever]

Many thanks.

 

[Burgo]

"The meter by my MG wall charger is showing 215V, 30.9A and a charge rate of 6.5kW See attached picture (the kWh figure is this month's consumption to date). Normally it indicates 219-221V / 31A / 6.9kW."

P=IV
30.9 x 215 = 6643
31 x 221 = 6851
Seems about right as you always get some losses and the display will round up / down.