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Discussion Starter · #1 ·
One question bugs me a bit about my buddy from Hiroshima. We know for sure that the gross capacity of the battery is 35,5 kWh. But how much of it is useable? There was talk of 32 kWh initially. But If you crunch the numbers and focus on predicted range that is clearly not the case. According to Inside EVs its 30,5. My guess would be 30 kWh or slightly less. Maybe Mazda plans to allow access to part of the buffer lat
er. In order to maintain range in spite of battery degradation? It just would be nice to know. Does anyone know? Or we are all in the dark?
 

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Discussion Starter · #2 ·
A question related to the first question is how far can you actually go at 0 percent State of Charge. Does anyone have any experience? Would love to try it out but worry about negative effects on the battery. In other words how much of the battery is useable at 0% SOC? If there are other tech nerds out there to discuss this with.. that would be awesome馃榾
 

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I wonder about battery percentage and range also. My home charger measures the electricity supplied to the car and from half a dozen charges, I conclude that 100% range would be equivalent to 33.5kWhr supplied. Question then is the efficiency of charging. At this (6.6kW) charge rate, the battery cooling system doesn't operate in moderate ambient temperatures and the temperature of the battery doesn't rise much so 95% would seem reasonable. In that case 100% as indicated would be equivalent to 31.8kWhr retained by the battery. That would leave 1.7kWhr residual battery capacity at 0% capacity if fully charged is truly fully charged. At that point one would certainly be driving carefully so that power would yield 7.1 miles or 11.4km. I have seen somewhere on the German site (but can't remember where) that someone drove 10km after zero percent before the battery died. It would have to be a real emergency or you didn't care about the car because taking this battery technology to zero charge is very damaging to longevity which is why the car companies design in 5% or so of "not to be used" capacity.
 

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Hi MX-30 drivers. Based on my experience with the car, I would say the usable battery capacity is apr 28,5 kW. With 11,6 kWh/100 km indicated consumption I drove 228,1 km + 16 remaining, with 6% in the city, without calculating any losses.
Maybe with warmer outside temperatures it can be slightly better.
One guy in Hungarian MX-30 forum drove bit more than 7 km after 0% battery charge status but could not get to the end.
Definitely there is at least 1,5 kWh available after indicated 0%, and the rest can be spare for the future degradation.
Any better ideas ?
 

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Congratulations on some very frugal driving. How much energy did you then need to recharge? At 6% SOC, I would need 31.5 kWhr for full recharge. If I use the on-board consumption meter, then I usually compute the battery size at 29 kWhr so very close to your 28.5. So, just like ICE cars, the on-board consumption shows the car in a favourable light and probably underestimates the energy use by about 3 or 4%. Alternatively, charging efficiency is only 92% and the on-board consumption is correct. I think this is what Vivamazda wants answered. Its a shame that no-one technical from Mazda feels the wish to share any of the design information with us.
 

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Discussion Starter · #6 ·
Problem is these things are complicated. Like relationships? 馃ぃ馃ぃ馃ぃ
Consumption stated by the car is what it is. If you compare consumption to State of Charge you realize that the former is a rough estimate. On the other hand measuring state of charge is not as straight forward as measuring the volume of petrol in a tank. So OK. We re confused. These OBD plugs Bj酶rn Nyland uses almost in his sleep maybe that would be a way to understand whats going on?
 

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Discussion Starter · #7 ·
Fun fact. In the model T Ford there was no fuel pump initially so going uphill you could run out of gas although there was gas, just not in the right place. Well guys this is the model T of EVs for Mazda. Kind of.
 

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Would be nice to have an OBD readout while driving the car in various road conditions. I am not aware of any app able to decode the MX-30 data. Do you know any ?
 

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Discussion Starter · #9 ·
Nope, sorry. Guessing you need 1 the right obd plug and 2 an app or something to process the info. Anyone has a clue?
 
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