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Discussion Starter · #1 ·
I just got my MX-30 few weeks ago. So I bought a decent charger it’s 40A max and it’s on a 50A breaker it has Wi-Fi and Bluetooth.

Anyways the most I have seen it charge at home is 29.9 Amps and it usually Holds that until 100% I thought it was standard to lower the amps the last 10% to condition the battery. Or does that mean Mazda has a buffer so when you change to 100% it’s not really 100% I know Zero Motorcycles have a buffer so if you charge to 100% it’s not really 100% more like 90%.

I have been charging to 90% usually and once every 2 weeks charge to 100% for battery cell balancing. Or do I not need to do that since it’s a pouch battery?

Also should I lower the charging speed to say 20 Amps to Extend the battery longevity over its life. To me 30 amps is not fast charging considering the size. I have a 1 kWh E-Scooter and charge it at 5 amps
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Assuming your voltage is 120v single phase then roughly 30 amps only equals 3.6kw (assuming that is correct). The car can take up to 6.6kw ac charging input. The UK normal EV charger output is 7kw but the car restricts AC input to the 6.6 kw level. DC wise the car can take 40kw. The cars battery control module will slow down charging at the upper end so you don't need to do anything.

Yes there is a lower and upper buffer. Mazda states 35.5 kw battery but we reckon only about 30.5 kw is in the normal usage band.

The cars battery control module should balance the batteries. Charging to 100% is not too harmful as long as it's not an everyday thing. Every couple of weeks is 👍 Regular DC charging causes more harm than AC charging.

Welcome aboard, hope you enjoy the car. Someone more technically savvy than me might provide more detailed info.

Alan
 

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Discussion Starter · #3 · (Edited)
Assuming your voltage is 120v single phase then roughly 30 amps only equals 3.6kw (assuming that is correct). The car can take up to 6.6kw ac charging input. The UK normal EV charger output is 7kw but the car restricts AC input to the 6.6 kw level. DC wise the car can take 40kw. The cars battery control module will slow down charging at the upper end so you don't need to do anything.

Yes there is a lower and upper buffer. Mazda states 35.5 kw battery but we reckon only about 30.5 kw is in the normal usage band.

The cars battery control module should balance the batteries. Charging to 100% is not too harmful as long as it's not an everyday thing. Every couple of weeks is 👍 Regular DC charging causes more harm than AC charging.

Welcome aboard, hope you enjoy the car. Someone more technically savvy than me might provide more detailed info.

Alan
It’s a dual phase 240V 50 Amp
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Discussion Starter · #4 ·
It’s a 240V 50A Dual Phase NEMA 14-50P outlet it uses both sides of the Panel 120+120 to make 240V that’s how 240V works in the USA. The normal outlet in the USA only has 120V so I had to wire in a special outlet for the charger.

I’m charging at 7.3 kWh steady through the entire charge. As far as DC Fast Charging, I only plan on doing that maybe once every couple months when I take a long trip to the Capital city of Raleigh.

Thanks for the info I am really loving this car.
 

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You effectively have the same as most of us at this side of the pond. In UK, we have single phase 240 volts ( I will typically see 243 volts vs your 246 indicated) and we are allowed 30 amp supply to our chargers. So, a nominal 7.2kW. With losses, that just about maxes out the on board AC charger that you have pictured. That is 6.6kW. DC charges much faster than that, though not as fast as Mazda claim. So, we can assume that 6.6kW is no issue.
The car will accept 6.6kW to 90% and then it backs off slightly. At 95%, it backs off a lot and that last 5% takes well over an hour. If you charge the car to 100% SOC then as you drive it, you will notice you have virtually no energy recuperation on the overrun and you get messages to tell you so. At 95% you get a little more regenerative braking but full recuperation does not take place until you get down to 90%. This tells me to charge to 90% and I do that every time unless I need all the range with 100% charge. That happens typically every 5 or 6 weeks. A year on, I notice no battery degradation. Mazda has designed a buffer at 100% but we don't know what it is. For those brave souls who have driven 8 or 9 miles below zero before the battery was completely flat, we can assume that there remains about 2.5kWh of charge at zero and there is a similar amount unusable at 100%. The ratio of available to maximum charge is small by comparison to other EV's so Mazda is being very conservative to protect the 8 year battery warranty. I wouldn't be at all surprised if they planned to unlock a little more capacity at year 5 to maintain the small range.
You don't need to cell balance but I do query your full charge rate at 90%. Time the last 5%; I'm sure it will take a lot longer than a quarter of an hour and perhaps your smart charger is telling you porkies. (That is a test for American English speakers)
 

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Discussion Starter · #7 ·
Sorry, for clarity, that is measure the time from 95% to 100% SOC.
Thanks for the information. Yeah I figured they left a buffer to save the battery for the Warranty. Zero Motorcycles has a BMS unlock that you can get an extra 3 kWh out of their pack. I wonder how many people ran out of juice and paid their cypher store so they wouldn’t be stranded. 😂
I would assume Mazda will do an update maybe in 4 years to help curb degradation so they can stay within warranty specs.
 

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Discussion Starter · #9 · (Edited)
Sorry off topic; I love how US garages are nicer than most UK flats :D
Yeah I’m still working on it, the floor is going to be solid 8mm rubber gym floor from front to back. I already insulated the front door. And I’m going to put heat and air conditioning in soon 😂

I mean it has a stand-alone Refrigerator and a stand-alone Freezer. Plus I have enough Toilet paper to last WW III in there. I do got to clean up some of the motor-cross equipment up and get some of the clutter out of there. But yeah it’s pretty nice in there. Thanks!!
 
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