Electronics > Beginners
Is there a way to safely charge a car battery with this equipment? If not, why?
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epigramx:
I have a step-up module from the china shops on which I can adjust both the current(limit) and the voltage output and I can feed it with an old PC PSU's 12V (they're supposedly max 400W, both the module and PSU). Now, I wonder how can I figure out only with that equipment and a particular car battery and a multimeter(I also have a voltage + current monitoring device) how to charge it safely (under supervision). Say, can I just set the module to 14.4V and the current limit to something high-ish and then monitor if the current it draws is dropping, or is there another way (if there is even a way)?
Yansi:
Use a proper charger.
Simon:
If you want to charge a battery right up 14.4V but don't leave it too long. You can float charge at around 13.5V. i would not try to put 400W or nearly 40A into a typical 40A car battery. i think the charge rate is usually arout 5-10A.

as suggested how about a comercial charger? they would be as cheap as the whole combo you have.
epigramx:

--- Quote from: Simon on October 20, 2019, 09:32:50 am ---If you want to charge a battery right up 14.4V but don't leave it too long. You can float charge at around 13.5V. i would not try to put 400W or nearly 40A into a typical 40A car battery. i think the charge rate is usually arout 5-10A.

as suggested how about a comercial charger? they would be as cheap as the whole combo you have.

--- End quote ---
It's also for the lols because I kept one that is not dead yet, and for general interest about the technology of battery charging (I don't need it for anything particular yet, so it's mainly general research, if it was for a real project, I'd probably try to find an always-on charging system anyway).
So you seem to imply that the voltage of the battery will remain less than 14.4V if I feed it with a 14.4V input (unless I misunderstood) and at that point it can be considered full (or, it sounds more logical to me that the voltage will/should remain 14.4V (if the source can manage it) but the current will drop below what is first drawn).
Regarding the current limit, I would never use the max of that module anyway (I doubt it can survive itself that way), so I guess it would help to research what current that battery model usually draws (unless 5-10A you mentioned is universally true).
Yansi:
I do not think that you car alternator, let alone in cars equipped with start/stop system cares about your 5-10A charging limit, bhaha!
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