Greg Locock wrote: ↑
Fri Jul 29, 2022 9:21 am
Of course enthusiasts often claim they can use degrading systems in untested environments. Challenger O rings anybody?
It´s not a matter of enthusiasts, but a matter of data and understanding how things work Greg
For an EV you need a high output from the battery, as it must provide 60kW or 500kW maybe, depending on the power of the car. If it´s a small and not very powerful car with 60kW and a 40kWh battery, the battery must provide 1.5C discharge rate. If it´s a tesla with 500kW and 100kWh battery, it´s 5C.
A standard home draw 1-5kW, wich will be 0.02-0.12C with a 40kWh battery, or 0.01-0.05C with a 100kWh battery.
So any battery must provide 1.5-5C when into an EV, and 0.01-0.12C when in a home, wich means the power demanded to the battery is reduced by a factor of 10 at least, or most probably even higher than 50. Charge rates are reduced even further.
OTOH, batteries catch fire when they get too hot, and they get hot when they´re discharged (or charged) at high rates. When the rate is reduced by a factor of 20-30 from a starting rate wich is ok for the battery, the safety margin is several orders of magnitude higher than any other component into any house or car.
It´s not a matter of enthusiast, it´s a matter of science, data and understanding how things work.