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Hi I want to charge my 48V battery with a 6kW DC alternator connected to an engine. My alternator is variable speed (2500 - 3000 RPM) Permanent Magnet alternator. Therefore voltage varies with speed. Is there any active rectifier chargers option available in the market for this application. Also can I use solar charger for this application since they can take variable voltages. Any help appreciated. It is for a project I am working with a company.
Hi, it depends of your battery bank size and voltage range of your DC alternator. Take a look to :
DC/DC isolated converters https://www.victronenergy.fr/dc-dc-converters
Charger range : some of them can accept a DC input starting at 90Vdc https://www.victronenergy.fr/chargers
Victron doesn't make any large DC-DC chargers. There may be alternatives from other manufacturers.
The Victron Skylla 48/50 TG charger works on between 180 and 400 volts DC but puts out a max of 50 amps to a 48 volt battery bank (2800 watts). So you'd need two of them in parallel to come close to your 6000 watts from the alternator.
I’ve been keeping an eye on this company who has a system that suits 48V via a buck boost device they call Scotty. Might be suitable for your needs and they use Victron products.
https://www.safiery.com/
