I need a battery charger that can take 110v or 220v (depending on speed of alternator) that always outputs 12v (with varying current)?

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answers:
Philomel say: A battery charger puts out more than 12V. It will produce 14V to 16V depending on the battery size in Ah.
The Battery spec sheet will tell you the recommended charge Current.
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say: You don't need 3kW to charge a battery! For a typical charging current of 10A say, for a 12V car battery charging at 13V, the power is roughly P = IV = 10x13 = 130W = 0.13kW.
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roger say: like this?
https://www.mpja.com/12-Volt-Power-Suppl...
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Maybe it's just me say: You have given us some electrical requirements that I am curious why. What are you trying to do? Perhaps one of us has a suggestion for a simple solution.
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Ghost Of Christmas Past say: There are plenty available. Switch-mode chargers and power supplies can usually work with input voltages of between 100v and 250v AC
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