increasing alternator output voltage?

I'm talking about voltage(NOT current/amperage), and not into getting into a huge discussion as to why you want the output voltage higher... I'm wanting to know HOW it is done.

People are running there alts at a 15V+ charging voltage for seperate battery banks, and to feed more power to unregulated amps...... This stuff I know, I just want to know How its done, and how to build one.

I'm not even concerned with having one tbh cause my car couldn't run it right now... only one alt, and only one battery......

this is nothing more than a how do I do it thread.... simply for the sake of knowing, i want to know how to build one of my own.

at some point i will run more batteries, and I do believe my amp is unregulated so I could feed it more voltage.

There are multiple ways to do it, just keep in mind that there is no such thing as "free power".  If you raise the voltage, it will pull more current from the alternator to allow for the increase in voltage.

Without doing any research at all, the "easiest" way would be to take the current voltage that is being outputted, oscilate it at a fairly high frequency (the higher the better most likely) and then run it through a custom wound transformer.  On the secondary side run a full wave rectifier  to convert it back to DC.

The key here is to use a high enough frequency that the transformer doesn't have to be outragiously big.  The higher the switching frequency (at least to a point) in to a transformer the more efficient it will be at creating power.

If I were going to build something like this I would do a lot of research in to switch mode power supplies and transformerless designs in general to try and eliminate the conversion from DC to AC back to DC.  I'm not 100% sure it can be done (I've never got too big in to power supplies) but it wouldn't take much research to prove or disprove the option.

I am not sure about the MLA piece, but a customer of ours has an alternator with an adjustable voltage regulator.  It will charge from 12 to 18 volts.  As far as I know it is an aftermarket alternator.  He has 3 alternators on his vehicle.  One for the 12 volt battery and 2 that are for the 16 volt batteries for the system.

I have no idea why you are wanting to do this, nor do I want to know.  If your amp does not have a regulated power supply, it will produce more rail voltage with the increased input voltage.  If the amp has rail voltage of plus and minus 48 volts with 14.4 in, the manufacturer is not going to spend the extra money on 63 volt capacitors and 150 volt output devices.  They will use 50 v caps and 100 v outputs.  When you increase the input voltage, the rail voltage will increase also.  So if you are using this in this manner, you really need to measure the rail voltage of the amp and check the caps to make sure that they are not already running on the edge.  Also give me the part number on the output devices.  They may all have the same number on them, or they may have 2 different numbers.

I hate it when the question gets answered while I am typing.