Recent content by wattmatters

It's a normalised range estimate, not an actual achieved range. So if the driving at that time had very good economy then the normalised 100% SOC range would correspondingly go up. If we have a period with nothing much other than slow driving on our local roads (with 40-80 km/h speed limits)...

This is the normalised range estimate and economy rate over the last two years for our MG4 Essence 64:

I use: https://github.com/SAIC-iSmart-API/saic-home-assistant-addon It provides all the sensors and controls via MQTT, so you will need to have an MQTT broker set up. Home Assistant will have an integration for that if you don't already have one or want to set up a broker external to HA.

It'll be an integration issue not correctly identifying your car model/battery capacity. Suggest asking about it on the developer's GitHub page for the integration.

That's because it is V2L. It is not designed for anything other than be a power supply to isolated loads and most definitely not anything grid-tied. As soon as you attempt to power a home via a compliant electrical circuit board then the car's V2L will trip off due to earth faults. As...

Here's a youtube vid where I discuss the V2H/G capability of the Sigenergy system and our MG EVs:

For those suggesting installing a power inlet and break before make transfer switch to isolate the home and V2L supply from the grid, it most likely will not work because the car's V2L system is not designed to operate a load with a main earth-neutral link. The V2L system is designed to power...

Note that the MG4 user manual does not distinguish between an equalisation methodology for LFP and NMC model cars. While the fundamental principles are the same, the reality is the different models do it differently. One example is since you can't set an upper charge SOC for an LFP battery...

It's not written for technical people either. It's full of translated information that is sometimes inconsistent. The MG4 manual is pretty ambiguous about the need for a (near) full discharge prior to an equalisation charge. It just says a "full slow charge" is required, which can simply mean...

I think they meant more than what is going through that cell, i.e. siphoning off power as per your diagram.

The resistors can also bleed energy from a cell when the pack is not being charged, so with balance charging switching on/off or ramping up and down in power delivered this can effectively result in a cell with high voltage reach a quasi steady state voltage or even drop down while over time the...

Especially if the cells and packs are all really well matched to begin with. With lower grade cells that are not well matched, then active balancing is going to be required.

Passive balancing dissipates energy from a high voltage cell while the charging continues as the rest of the cells are brought up to a higher voltage. The EVSE is also powering more than the battery, on board systems are also active. Images above shows aircon is on, the battery management...

I recently had an video interview with Youtube journo Neerav Bhatt. We covered a range of things and he split the chat into a couple of videos, this one on our MG4 experience: 38 minutes and change.

Unless you are an accredited solar/battery installer and licensed electrician, then you are not permitted to install a grid-tied generation/storage system. Off-grid is a little different, there are demarcations for what is mostly OK for DIY and what isn't but it's a little blurry.