Eric,
Plenty... and you may also be able to run an arc welder at the same time. :-)
There are a lot of variables (belt slippage, friction, ambient temperature, voltage drops, etc.), but as a very rough theoretical calculation, you're probably looking at an additional 4 to 5 HP to turn that 175A alternator at full draw? (175A*27.5V)/746W = 6.45. The 50A alternator requires 1.8 HP.
Steve
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--- In amelyachtowners@..., kimberlite <kimberlite@...> wrote:
Steve,
My Amel Super Maramu has 12 house batteries with a capacity of about 690
amps at 24 volts. The alternator is also a dual belt 175 amp alternator.
Fair Winds
Eric
Amel Super Maramu #376 Kimberlite
_____
From: amelyachtowners@...
[mailto:amelyachtowners@...] On Behalf Of svsummerlove
Sent: Wednesday, April 13, 2011 4:19 PM
To: amelyachtowners@...
Subject: [Amel] Re: 220v supply to watermaker
Pat,
Good to hear from you too.
It's possible your 60L/hr watermaker draws little enough amperage but I'd
doubt it. On my boat, the 140L watermaker draws 13A @220V, which works out
over 2800 Watts. Your 60L is probably a lot lower than that. It's also
possible you have an upgraded 24V alternator. Mine is 50A, so the
theoretical maximum I can put into the batteries is around 1300W to 1400W at
27.5V.
If you have an aftermarket 100A alternator regulated to 27.5V, you've got
over 2700W, but it will take more HP from the auxiliary to drive it. One of
the fundamental rules of energy management is there's no free lunch.
Also, I seem to remember a version of the 60L unit that ran on either 220AC
OR 24DC, but that may just be a newer model. If you have one of those, you
wouldn't need the inverter.
Please look after my favorite anchoring spot opposite Ordinary Point.
Take care,
Steve
SM340
Summer Love
--- In amelyachtowners@...
<mailto:amelyachtowners%40yahoogroups.com> , sailw32@ wrote:
Steve, Good points and I have thought it may not make sense. If the engine
alt. is not adequate to more than produce the neccessary amperage ,than it
makes no sense at all. I was guessing the genset burned closer to 1/2 gal.
an
hour and I was thinking the inverter could run the micro as well. The
weather has broken and is getting warmer thankfully, looking foreward to
summer
and crabs on the Sassafas !
Good to hear from you,
Pat
Shenanigans
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