Quote:
Originally Posted by gumby79
How well would one of theas handle 200A grid intake heater on the 12v side and start on the 16v start side, or a groop 31 + there group 31 cap? How small of a battery FLA AGM LiFe PO4 with a temperature sensitive BMS (only charge when the battery is upto temp)?
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I don't have specific answers to your questions, but from my experience, Supercaps are super bad at handling both the grid heating, and immediately after, starting my 5.9L Cummins engine.
It all depends on how long the grid heaters have to run, how many farads of capacity you have, and how much of that capacity is needed to start the engine.
That said, an undersized lead-acid battery in parallel with supercaps should work in many applications. I'd let the supercap charge up for a few seconds after the grid heaters turn off, which should then provide enough oomph to start the engine.
On my truck, 5-series 3400 farad capacitors alone are able to start the engine, provided I don't run the grid heaters at all, and haven't let cabin lights, or other electrical draws run them down too much.