Electrical requirements - Page 2 - SailNet Community
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post #11 of 34 Old 03-07-2011
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It would be my choice to use the generator to power the washer. If the generator was large enough it could also power an AC charger of some size. But a generator over 2000 watts is less common, more expensive and larger.

The best option for battery charging is a large alternator and a 3 stage external regulator. Any alt over about 100 amps needs 2 belts and a different than standard mount if you expect belts and mount to last. Something in the 150 amp or larger size dialed back by the reg to 80% for cooler running and longevity makes sense.

Brian
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post #12 of 34 Old 03-07-2011
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I don't have the specifics handy, but my genset recharges the house bank in much less time than the alternator of the main engine and the genset burns less than half the diesel per hour as well. Win-win.

I think that should be the analysis, rather than how to max the genset. As you've described, you are going to use solar/wind for your 12v recharge, which makes sense if you don't try to invert it back to 110v. Use the genset only every few days for wash or the occasional recharge. Much more efficient that running your main engine several hours per day, even when on the hook.


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post #13 of 34 Old 03-07-2011
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How big an alternator you may put on the engine will probably be limited by the load (side) you may put on the pulleys.(Check with Yanmar specs!)
Your charging requirements will at least demand a shaft driven alternator at the front vibration damper!
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post #14 of 34 Old 03-07-2011
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First, you really should install a battery monitor to get a more realistic idea of what you're really using on a daily basis. This will also give you a much more accurate basis for sizing your charging system and battery bank.

Reducing your usage is often far more cost-effective than increasing your battery bank size, since a larger battery bank will cost you more in fuel used, weight, etc.

I would point out that batteries are sized in AMP-HOURS, not amps, since amps are an instantaneous rating and really say nothing about the battery bank's actual capacity. The amp-hour rating that is generally used is the 20-hour rate.

Mitempo's advice about using the genset to power the washer is a good one, since it will put a lot less wear and tear on your batteries. If you do opt for a genset, it might make sense to get electrical refrigeration, rather than engine-driven refrigeration.

One caveat about the watermaker is that you should still carry enough water for you and your crew's needs, since watermakers can break. They also should not generally be used in populated harbors, since most are too polluted and will damage the RO membrane if you use the watermaker there. IIRC, the ORC racing rules say that you should carry one gallon per person per 100 miles of distance remaining on each passage at a minimum.

I'd recommend you read this article on Solar Power on Boats I wrote a while back.

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post #15 of 34 Old 03-15-2011
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Something to think about is a battery monitor copled with a solar or better still a wind charger. With sun and trade winds, they should work well in the carribean. Wind chargers are more efficient but do have some noise. The issue is that the battery wants and the engine provides the high amp charging you metioned but then, after the "bulk cycle" the charging rate for the "absorbtion cycle" falls off to a long low charging rate., about 5% of the Amp Hr capacity. It's not great to run your engines like this but wind solar are optimum for long lower charging rates.
The battery monitor traks the amp hours out of and into the battery and would well suited to managing the battery operations you're planning.
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post #16 of 34 Old 03-26-2011
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We have a Beneteau 50 and re did every thing. we put 800 amh with a seperate 200 amh start bat. 3-135watt solar and a wind gen plus a 6 kw genset. we also added two 12v frigobaot systems and kept the sea frost which we don't use much. we found fuel very expensive in the island. the solar and wind keep up withall our needs except the watermaker. They always pull more than they should . your washer and inverter will kill you batteries by discharging them too much too fast. hope this helps--billy

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post #17 of 34 Old 09-13-2011 Thread Starter
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Responding to your response of several months ago as we have been delayed in getting started (old story I am sure) to allow our traveling companions to get their shore life in order. We are just now starting the upgrades.

It sounds like you have done everything to add resources and capacity that we plan to do.

Any idea what your total upgrade cost was? Anything you would change after using it for a while?

Thanks for the input!!

As a side note, I tried to ask the cost question in a PM, but am too junior here to have PM rights.
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post #18 of 34 Old 09-26-2011
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A thought on clothes washing. Couldn't you just put your clothes in some sort of a net bag and drag them behind the boat. You would of course have to fresh water rinse them. Has anyone tried this?
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post #19 of 34 Old 09-26-2011
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Quote:
Originally Posted by SeaDreamer1Day View Post
A thought on clothes washing. Couldn't you just put your clothes in some sort of a net bag and drag them behind the boat. You would of course have to fresh water rinse them. Has anyone tried this?
This has been known to be done by long term cruisers. They also often sail near naked. Could it be the cardboard clothing?


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post #20 of 34 Old 10-18-2011
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Solar system and battery bank

Hello.

I want to develop a system on solar that the load is 250 watt continous. the battery bank should support it to 2 day. can anyone guide me in it like the solar panel should i have it's ratting and about battery bank.

regards;
taqi abrar
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