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First recorded activity by BoatBanter: Feb 2007
Posts: 2,869
Default Solar Catamaran


wrote in message
oups.com...

The max rating of the engines is not the point: IF the panels produced
10 kW for 12 hrs a day straight, and there was not much loss in
storage, they could run on 5 kW 24 hours, which is 8 hp, and could
work. (I guess...)



I can tell you aren't overly familiar with photovoltaics. 10KW
represents the max output when the sun is straight overhead and the temp
is mild That same 10KW array will produce perhaps 5K when the sun is at
a 45 degree angle and even less when the angle is less. The total
wattage output of a 10KW array is probably 50-60 KW on a good sunny day,
not 120KW per 24 hour day.

You can't run motors and charge batteries and run electonics with that
paltry output.

Something's fishy here...

Wilbur Hubbard



The question for the real solar experts was how much can one
realistically expect, i.e. how much do two 5 kW panels generate on a
real day in the real Atlantic, how much is left after storing in
batteries, etc....

Or maybe for the long distance cruisers: If you were adrift in this
area at this time of the year, would the prevailing winds blow you
over in the end?

Anyone?



?, On Mar 28, 9:22 am, "Wilbur Hubbard"
wrote:
"mandolin2k" wrote in message

oups.com...

what the heck do they do at night? LOL!


They claim they have a large battery bank for night time use. And
they
claim they have enough output from the array to both charge the
batteries during the day and run the motors. The array output is only
10KW(max). The twin engines use 8KW each for a total of 16KW and if
they
have to charge batteries too then it seems to we they lack sufficient
solar array for the job.

Something's fishy here.

Wilbur Hubbard



 
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