what is a supercapacitor?

shortly spoken: supercapacitors are high-capacity capacitors - they have higher capacitance and lower voltage limits than other types of capacitors. they lie somewhere in between electrolytic capacitors and rechargeable batteries. this means in practice: they charge much faster than batteries and are capable of highest amp-discharge, due to low internal resistance.

what is the difference between a (starter)battery and a supercapacitor?

batteries offer a superior energy density and possess a higher breakdown voltage while supercapacitors are smaller, lighter, have more robust operating limits, possess a longer life expectancy and have an unparalleled power density.

what is a supercapacitor used for?

supercapacitors are used in applications requiring many (up to 10.000 cycles) rapid charge/ discharge cycles, rather than long-term compact energy storage. they are deployed in automobiles, buses, trains, cranes & elevators where they are used for regenerative braking, short term energy storage or burst-mode power delivery.

can i use a supercapacitor as a starter-battery?

capacitors don`t provide a large amount of energy storage because they have less energy density than batteries. capacitors are useful to provide short duration high power requirements because they can be charged or discharged at a higher rate than normal batteries and because of this specifications they are the perfect engine starters.

advantages & disadvantages:

30% higher in costs

1 new starter-battery would have cost me 76 US$

1 new supercapacitor i bought online for 103 US$

saves you 50% space

my old starter-battery: 17 x 30 x 20 cm

supercapacitor: 7 x 42 x 17,5 cm

saves you 75% of weight

my old starter-battery weight was 12 kg

my new supercapacitor weight is 4 kg

1.000 % longer in charging/ life cycles

stater-batteries usually get replaced every 2 years

supercapacitors lasts easy 10-20 years

DISCLAIMER: as you may know, i`m a cruiser, not a racer. i`m interested in new technology, especially in optimizing things (invest & outcome) but i`m definitely not a electronics specialist nor a tekkie..

my sailing-liveaboard friend ferdi`s passion is electronics and i`m grateful that he directed me towards the up-to-date technology when i told him: „i need to replace my starter batteries“ check him out (instagram.com/ask_ferdi) (a detailedYouTube video about this topic is in the making)

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