Posted by Derweibhai on May 19, 2023 at 18:17:32 from (174.228.33.29):
I have been playing with graphine ultracapacitors for a few years now after watching all of lasersaber's videos on YouTube. Turns out that for specific niche uses that ultracapacitor "batteries" are fantastic. I have a pair of 6 cell units that I put together using Maxwell boostcaps for one and Eaton for the other. They are 2.7v x 6 for the Maxwells and 2.85v x 6 for the Eaton. I have the Maxwell unit dedicated for use in my 6-71 Detroit powered International semi (it replaces the 2 12v lead acid batteries).
Imagine a "battery" with no electrolyte, that weighs 8 pounds, doesn't care what orientation it is mounted in, can drain completely and be left dead indefinitely or freeze without damage of any kind. It can be charged from dead to 16+ volts in under 2 minutes with a 200A charger. Has an estimated 7000 CCA which aren't effected by cold temperatures. It will crank an engine for 35-40 seconds with the ignition off before going dead. It cranks down to 9v or less where lead acid won't crank below 11.5-12v. It also operates at alternator voltage so instead of 12.7v of lead acid it stays at 14v of the charging system. It will operate in a 6v system happily with no modification, it just stays at the generator voltage of 8v.
Downsides? Costs about $300 to build. Doesn't have much reserve capacity, so parasitic drains will deplete it quickly. I run a battery cut-off in the semi and shut it off if it has to sit longer than a few hours. I put the Eaton unit in my Case SC (6v) for testing and it has been great so far. I have many tractors and other vehicles and I am sick replacing several hundreds of dollars in batteries yearly. I am also developing an in cab battery kill using a starter solenoid on the negative cable with a hot wire from the capacitor to a switch in the cab to energize the negative terminal.
Fascinating technology, it stores electricity as static electricity instead of chemical. I plan to just move the Eaton unit between vehicles. I also made a small unit for our lawnmower and generator. That one is the size of a softball. Should pay for themselves in no time.
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