When to Use 12v Dc Generator？

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I'm afraid I do not know much about electrical engineering but have been reading/watching videos on the basics of how generators work and their anatomy, however I still have some unanswered questions I am hoping you guys could help me with.

1) According to the link, this motor has a rated current of 0.06 amps, and I believe most phones draw in the range of 0.5 to 1.5 amps. Does this mean that it will be insufficient to charge at all or that it will simply take longer?

2) If the generator drops below the 60 RPM that it's rated for, will it still supply a charge to the battery? And what happens if it goes above the RPM? I'm still a little confused on how voltage, current and rpm are related quantitatively. Any resources would be helpful.

3) Do you think the 60 RPM motor would be the best option or should I choose something higher?

4) Would this setup be a feasible option for charging a backup battery? Let's say I just want to leave it running all day when I'm out camping, is there a way to calculate a rough estimate of how long it would take to charge a typical 12V battery?

I know these questions are probably overly generalized but I'm not sure where else to start. Any help appreciated, thanks.

Hello, I am currently working on a engineering project for school and have been tasked with researching the basics of electrical theory. We are building a small, portable hydroelectric generator for the purposes of charging a cell or other small electrical devices. I already have the motor set aside which will be a 12V, 60RPM DC motor.I'm afraid I do not know much about electrical engineering but have been reading/watching videos on the basics of how generators work and their anatomy, however I still have some unanswered questions I am hoping you guys could help me with.1) According to the link, this motor has a rated current of 0.06 amps, and I believe most phones draw in the range of 0.5 to 1.5 amps. Does this mean that it will be insufficient to charge at all or that it will simply take longer?2) If the generator drops below the 60 RPM that it's rated for, will it still supply a charge to the battery? And what happens if it goes above the RPM? I'm still a little confused on how voltage, current and rpm are related quantitatively. Any resources would be helpful.3) Do you think the 60 RPM motor would be the best option or should I choose something higher?4) Would this setup be a feasible option for charging a backup battery? Let's say I just want to leave it running all day when I'm out camping, is there a way to calculate a rough estimate of how long it would take to charge a typical 12V battery?I know these questions are probably overly generalized but I'm not sure where else to start. Any help appreciated, thanks.

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As others have mentioned, AC for sure. it's less efficient.. but useful and practical for so much more than just charging your batteries. You have to think about this investment over the period of "your lifetime", and how much technology changes in batteries over time. 12v, 24v, 48v, whats next? will your DC generator be able to do whatever is next?

AC is here for the forseeable future, and the resitance to change from 120/240 in the US means it will likely be around for the rest of yours and my lifetimes. You can always buy a new battery charger that charges from AC because it wouldn't be dependent on one particular brand, or dependent on the company still supporting your generator model. (ie, to sell you a conversion kit from 48v to.. whatever.. 96v.. etc.

However, battery chargers for whatever the new voltage standard is, will be readily available to buy from multiple suppliers/manufacturers that all take an AC source.

I'd take the hit in efficiency, for the future upgradability/expandability.

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