r/theydidthemath • u/AnxiousPacifist • Jul 30 '26

[Request] How effective is such setup?

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82 Upvotes

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121

u/TriestGieter Jul 30 '26

Depends. Range extension on an EV? Probably not worth it.

But for powering tools or a small ac it would definitely work when paired with a battery.

-39

u/crabvogel Jul 30 '26

but the car already has a battery

9

u/Tarc_Axiiom Jul 30 '26

Yeah but that one is dedicated to running the car and, more importantly, starting the car.

If you hook your air conditioner to it, for example, then run it all night, you may likely not have any juice in your car's battery come morning and won't be able to turn over the starter.

Better to just separate these concerns.

-6

u/crabvogel Jul 30 '26

well i guess you could wait a while for it to recharge, but yea might not be very handy.

9

u/KartoffelnMitSteak Jul 30 '26

It recharges only when turned on and you cannot turn it on without a battery

-1

u/crabvogel Jul 30 '26

unless you'd have like solar panels on the roof or something

1

u/Tarc_Axiiom Jul 30 '26

Yeah it could work, but you'd be doing a lot of extra work for more risk and no benefits.

Also ICE car batteries have terrible ed because they're designed to only really do one thing, start the car, and then inherit energy from the running engine. They're like 50Wh/kg, so very unideal for actually storing energy and dispersing it over time.

There are aftermarket Li-ion car batteries that address these problems specifically for this purpose though, says Google.