Re: [electricboats] Recommendation for 48 v inboard motor + generator.

Dan (and anyone else who wants to explain!),

Delving back a little...

On Fri, 24 Mar 2023, 3:03 am Dan Pfeiffer, <dan@pfeiffer.net> wrote:

I got a 2nd 12kW motor to use as a generator with a 3cyl Kubota diesel I have (18hp) but have not built the genset yet.  The diesel is very compact and I figured I could get a 10-12kW 48VDC generator from the combo.  After 2 seasons of use I think a smaller genset would do fine.  Maybe 5-6kW.  I could motor at decent cruising speed with that.   Your use may be different.   Genset info:

http://dan.pfeiffer.net/10m/diesel_genset.htm

I just got a quote from one of the few marine DC genset places, and unfortunately it matches what I could find from the others - a new 16kW continuous 48V DC genset is about AU$28,000 or US$18,500. Not installed. Ouch!!

I see above Dan you thought about getting around it with a self-marinised bobtail, connected to a ME1616.

I'm thinking of similar, but perhaps an already marinised Beta 20 connected to the ME1616 (another of which will be propulsion) since I am not particularly mechanically minded to self marinise.

Could you explain to a layman why, if using the ME1616, you would need rectifier or regulator? I thought the ME1616 already put out 48V DC (I presumed an actual 54V or so) with controller. Or would you replace the usual Thunderstruck kit controller with the rectifier and reg for the genset?

Since a brand new marinised kubota (Beta 20) could be less than US$8000, and the ME1616 is about US$1500, it looks about half the cost of buying a named brand 48V DC marine genset! Thoughts?

Another option for marinised is a Yanmar 3YM20. Neither though are a perfect rpm match for the ME1616 which is only (!) 12kW. But if I can spend US$10,000 for 12kW vs $18,500 for 16Kw then it seems a big win.

Rob

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