Electronics > Power & Renewable Energy

Electrolytic capacitors in Electric car charger

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Faringdon:
hi,

The Standard electric car charger should last 10 years
Does it contain electrolytic capacitors?
If so, what is the lifetime calculation for them?

bob91343:
Electrolytic capacitors generally have much longer lifetimes than 10 years.

bdunham7:

--- Quote from: Faringdon on October 09, 2021, 10:03:47 pm ---The Tesla Power wall takes about 10 years payback time.

--- End quote ---

That seems a rather large and unsubstantiated generalization!


--- Quote ---What if the electrolytics (if there are any?) fail on 10 years one month.......pretty much negates any payback!

--- End quote ---

Well, I suppose it could be repaired if that was all that was wrong with it.  But I wouldn't order the parts just yet.  I'm repairing an old and rather complex device right now that has hundreds of capacitors, and I'm replacing quite few of them--mostly tantalum beads.  I haven't had a bad electrolytic yet on this unit, but all of the polypropylene film caps are bad.  So perhaps best to worry about something else.

Faringdon:

--- Quote ---Electrolytic capacitors generally have much longer lifetimes than 10 years.
--- End quote ---
Thanks, thats true, but there are poor quality "85degc, 1000hr" electrolytic caps, and there are indeed much higher quality "10000hr,125degc" ones.
Nobody knows which are used.


--- Quote ---Well, I suppose it could be repaired if that was all that was wrong with it.
--- End quote ---
Thanks , but a dead electro can well result in overvoltages to the components in the vicinity, as such, no repair can realistically be done. And sometimes, if a component suffered overvoltage stress, then it may not fail then, but its lifetime would be much reduced. As such, post failure repair begs questions.....of course, re-capping after so many years  would doubtless be a good idea.....but have the caps been mounted in a spot which makes it easy to take the el caps out and replace them?

Siwastaja:
Electrolytic capacitors are not the only component which can be dimensioned poorly or penny-pitched. I wouldn't concentrate on electrolytic capacitors only, but design and assembly quality as a whole.

High-quality, properly dimensioned elcaps are still quite small part of the product cost and easily allow 15-year lifetime in usual household environment, so unless it's absolute race-to-the-bottom toy product, it makes no sense to pitch pennies here. Of course, due to some mismanagement, this can happen, but so can many other failures too.

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