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Re: level 2 charging cables/charging rate

Posted: Mon Sep 14, 2020 4:19 am
by JejuSoul
MassDeduction wrote:...All other things being equal, if you've got the time (such as when leaving it on charge overnight), aren't you best off charging at a slower rate for optimal battery health? For example, if it's a 64Ah battery, aren't you best off charging at a rate of 16A (AKA 0.25C)? Sure, if you're in a hurry, charge at the fastest safe rate. But if you've got the time, why not charge at an optimal rate?

There's a lot of factors involved. The best solution is to install a 32A EVSE which allows you to choose any current such as OpenEVSE.
Image
https://www.youtube.com/watch?v=cIvmYP57eOo

I have a 32A charger and two 27kWh Soul EVs. To charge one car fully at 32A takes 5 hours. The time of day with cheapest electricity rate is from 11pm to 7am.
This is possible to do because I normally charge from 20% to 80% not fully.
Normally however I alternate days, so I don't have to go out in the middle of the night to swap leads.
If I had the option to charge one car all night at 16A then I would prefer this.
But sometimes there will be a need to charge faster.

My next charger will be an OpenEVSE. I do think optimal battery health is best served by slower charging, and that this is more important than the lower efficiency and inconvenience of slower charging.