Re: [Electric Boats] Marine Solar Array makes 3 knots

 

Apologies. I just looked further down the post and saw that it was talking about a specific example of running a boat directly off panels. In that case then by the time you are talking early morning or late afternoon the 10x figure of tracked output versus horizontal output is absolutely right on. Just get a solar panel and test it yourself, which is easy to do. Late afternoon mount the panel horizontally and put your test meter on amps. Measure the short circuit current of the panel. Then aim the panel at the sun and measure the short circuit current of the panel, and you will see no small difference. The current generated by the panel is the limiting factor of how much power is developed, so it is pretty accurate as a power indicator.

 

 

----- Original Message -----

From: Myles Twete

To: electricboats@yahoogroups.com

Sent: Monday, October 03, 2011 7:14 AM

Subject: RE: [Electric Boats] Marine Solar Array makes 3 knots

 

James noted:

"Tracker Expected to be released soon.  By Focusing on the sun, power developed is as high as 10 times more than if panels are mounted horizontally"

Really…10x?

Would you believe 18%: http://www.civicsolar.com/resource/effect-array-tilt-angle-energy-output

Array Tilt Angle (degrees)	Phoenix, AZ (33 North)		Portland, OR (45 North)
	Annual Production (kWh)	Delta (%)	Annual Production (kWh)	Delta (%)
0 - flat	5,723	0	3,624	0
10	6,178	+8%	4,019	+9%
20	6,461	+13%	4,239	+15%
30	6,575	+15%	4,355	+18%
40	6,526	+14%	4,368	+18%
50	6,310	+10%	4,279	+16%
90 - vertical	3,966	-31%	2,967	-20%

From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of James
Sent: Sunday, October 02, 2011 6:37 PM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Marine Solar Array makes 3 knots

 

We have just recently completed testing of our solar array which you can find on the website at

http://www.propulsionmarine.com/electric/charging-sources

SOLAR - The Propulsion Marine Solar Array Features:

2 x 225 watt Sanyo Panels for total of 450 watts at 90 Volts

Midnite Solar Charge Controller

Electric Actuator Lift Arm

Electric Worm Gear Chain Drive to Rotate Pole

Joystick Control

Tracker Expected to be released soon.

By Focusing on the sun, power developed is as high as 10 times more than if panels are mounted horizontally

Kapowai is capable of obtaining 3 knots while motoring under power made directly from the solar panel.

James

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