Ultra/supercapacitors
I use a PTO powered 10 kw generator but have slightly more start up loads than Generator can handle so I am adding small banks of ultra capacitors. The research so far shows that they may be replacing batteries. Some people are using them to replace/work with car batteries. They are the size of a d cell battery and have about 2.5 volts and when hooked in series work great. Even the standard capacitors would work great if your system only needs help for start up currents.
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