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Old 11-11-2013, 07:28 PM   #21
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You wont get 5KW out of a DC alternator, but thats why we have marine generators onboard.
Sure you can ... just need to go 24V and talk to these guys:

High Output Alternators manufactured in the USA by ZENA, Incorporated
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Old 11-11-2013, 08:13 PM   #22
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Sure you can ... just need to go 24V and talk to these guys:

High Output Alternators manufactured in the USA by ZENA, Incorporated
Yes, I suppose your're right.

Those are some really nice high capacity alternators!
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Old 11-11-2013, 10:37 PM   #23
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Da way we do it! - -> Old School Stuff!!

1977 7.5 Kohler Gasoline Generator

Fuel Consumption (as per orig factory book):

1. 25% Load .70 gal/hr (2.6 lts/hr)
2. 50% Load .80 gal/hr (3.0 lts/hr)
3. 75% Load .1.1 gal/hr (4.2 lts/hr)
4. 100% Load .1.4 gal/hr (5.3 lts/hr)

We generally use our Kohler gen set .50 to .75 hr in morning and sometimes (but not always) for approx same duration in eve. Generator is well muffled, runs smoothly, and creates no vibration as well as very little noise either aboard of nearby off board. I keep the load between 25% and 75% (often lower than higher; as I don't activate all breakers at same time). I can therefore safely calc my gasoline use at 1 gal/hr. Figuring 1.5 hr daily run time (that’s a bit higher figure than actual use): 4 day weekend = 6 gallons gen set fuel per weekend. Not too bad for coffee, hot water, ac fridge chilled, house bank charged, some limited cooking (I do a lot of BBQen) and computers charged while playing aboard and swimming off our fun Tollycraft tri cabin!

Happy Boating Daze! - Art
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Old 11-12-2013, 06:14 AM   #24
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Any bus repair shop will have used 300A 24V alternators sitting on the shelf.

$500-$1000 each flat belt drive

With a 4KW sine wave inverter you can operate 2 air cond , and other stuff at the same time.
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Old 11-12-2013, 08:53 AM   #25
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Sure you can ... just need to go 24V and talk to these guys:

High Output Alternators manufactured in the USA by ZENA, Incorporated
Thanks Rick! That baby is a Bad Beaitch! LOL I plan to have a skilled marine electrician I know go over our Tolly in next year or so. I have your link and some page info in a folder... will discuss with him.
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Old 11-12-2013, 11:56 AM   #26
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Well!! This is about a cruising generator not a stand alone belt drive generator.

I had one on the Heads Up when I bought it and I was running it on a channel crossing when a boat turned in front of me and I had to make speed corrections. I quickly found out that particular generator didn't like slower speeds while operating and in fact blew up. I didn't like the restriction of engine RPM and the fact all my controls were inside and not on the bridge. I could never find parts for it so I tossed it.

I do have a nice mount and double pulley set up on my port engine though.
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Old 11-13-2013, 08:34 AM   #27
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I do have a nice mount and double pulley set up on my port engine though.

You should be able to spin a 150 -175A 12v alt with great belt life.

Only about 2000W but cheap and fine for a single air cond or a huge supply of house toys, with a 2500W inverter.
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Old 11-13-2013, 01:55 PM   #28
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Not sure if it matters or helps. But you can try Fabcopower.com. All types of neat setups available.

Sent from my Galaxy SIII using speech to text.so some words may not be perfect.but it's easier.
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Old 11-13-2013, 03:12 PM   #29
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Good Luck and the last tip, get an attachment for that gen so it makes a true sine wave, not a modified square sine wave.

Since an AC generator (an alternator) can't make anything but a sine wave and a DC generator produces a unidirectional current flow with a half-wave ripple form, neither one will give you a square wave or a modified sine wave at the output.

Only an inverter or other switching type power supply can do that.

What kind of "gadget" do you mean?
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Old 11-14-2013, 06:30 AM   #30
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so it makes a true sine wave, not a modified square sine wave.

Interesting what you are attempting to power.
We have no monster motors Air Cond or water maker , just house goodies.

The modified square sine wave. (what I call chop chop power) has operated every appliance aboard .

The blender , microwave , toaster , cusinart or bread maker are happy with an under $200, 1500W inverter.
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