Where has the 10HP come from? If your boat requires 10HP to do 5mph then it is either very heavy or a pig.
The 4T boat needs 1600W at the prop to do 8kts. That translates to 2285W at the batteries to deliver that power with an efficient system. Over 24 hours it is 54kWh. That can be delivered by 9kW of panels with 6 hours of sunlight. Panel power density is typically 150W/sq.m so 60sq.m as required.
All these values have been stated previously.
To do 5mph with a 4T boat only requires 250W at the hull - say 450W allowing for losses. Becomes 10.8kWh over a day so say 3kW of panels.
On 09/01/2016, at 1:25 PM, "taladorwood@yahoo.com.au [harryproa]" <harryproa@yahoogroups.com.au> wrote:
Well let's look at it a little more clearly. Lets say you are on the equator with 15% efficient panels. That means for every square meter of surface you are getting 150 watts.To get 2285 W's output you need 15 square meters of solar panels, which is equivalent to a 3 hp engine.You will need more than 50 square meters of coverage to generate the equivalent energy of a 10 hp engine.To operate when the sun isn't shining you will need an additional 100 square meters of panels and 120 kW of storage (ouch).Basically solar power requires a surface area over three times the surface area of my boat to power my boat at 5 knots. . . . And no clouds in the tropics^^Talador
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Posted by: Rick Willoughby <rickwill@bigpond.net.au>
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