수리 사례

2026. 6. 30. 작업

증상

Replace car batteries with capacitors?

처리 내용

Yes its possible to start a car with Ultra capacitors. These caps don't appear to have a cycle life that the traditional lead acid batteries have. The ability of these caps to provide starting current is very good. There are a couple of snags: The caps at present are more pricey than the best lead acid batteries. The caps are strung in series to get the nominal 12V which is fine when you use 6 of them rated at 2.7V each. Don't use them on old cars with a generator and electromechanical regulator because their voltages simply are not accurate by modern standards. It would be wise to include some balancing electronics to keep the voltage on any cap below 2.7V. This is all not too bad so far but this is why I have not done this yet. The ultra cap has brilliant power density but bad energy density compared to the lead acid. It's like comparing strength to endurance. Modern cars that have decent charging systems are likely to have higher sneak currents that occur when the key is off. In oth