Hearted Youtube comments on Engineering Explained (@EngineeringExplained) channel.
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Here in Chile, in my company, we have more than 800 electrical buses with around 250KWh of original capacity, bought almost yearly from 2016 to 2023. We currently don't see a significant (statistically) degradation in capacity (SoH) even after 300.000 KM, but we take precautions: we avoid charging to 100% wen in the higher side of the city to avoid loosing the possibility of recharging on the road, we do a full charge at least once a week, we rotate the buses from different routes, we don't start routes with less than 30% of charge to avoid running out of energy due to unexpected problems on the road. We have some cases of degradation of around 3%, but once again, on a fleet analysis, degradation = 0% statistically.
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