Wednesday, January 27, 2016

Re: [Electric Boats] Re: 12V DC -> 120V AC vs. 48V DC -> 120V AC

 

Volts x amps = power in watts.

2.5 kn - 7 x 48 = 336 W
4.9 kn - 64 x 48 = 3072 W
5.4 kn - 90 x 48 = 4320 W
5.8 kn - 122 x 48 = 5856 W
5.9 kn - 141 x 48 = 6768 W

So, it seems obvious something around 4 kW steady state (continuous duty) is the "right" minimax choice, with extra pwr being a personal preference, and not practically useful, in general.
Half  a kn speed = 50% morepower wasted, for no real meaningful result.

Note that I asked for the volts because if the system was, say, 24 V, then the power needed would have been half.

On 24/01/2016 17:30, tkgc9 tkgc9@yahoo.com [electricboats] wrote:
 

48 volts

-------- Original message --------
From: "Hannu Venermo gcode.fi@gmail.com [electricboats]" <electricboats@yahoogroups.com>
Date: 1/24/2016 1:16 AM (GMT-06:00)
Subject: Re: [Electric Boats] Re: 12V DC -> 120V AC vs. 48V DC -> 120V AC

 

What the voltage, please ?

On 24/01/2016 00:23, tkgc9 tkgc9@yahoo.com [electricboats] wrote:
 

Here is the profomance data for my Pearson P 30 with Electric Yacht 10 kw. System and a 3 blade prop



Speed. Knots           RPM.          Amps.     L mrtTemp
2.5.                              774.            7.                 78
3.                                  1079.        17.               80
3.8.                               1305.        28.              80
4..3.                               1505.       42.              84
4.9.                                1754.       64.              86
5.4.                               1926.        90.             93
5.8.                              2115.         122.          100
5.9.                              2193.           141.         107


--   -hanermo (cnc designs)

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Posted by: Hannu Venermo <gcode.fi@gmail.com>
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