Jim,
It's nice to see that PV manufacturers are getting close to 20% efficiency. Looking at the original request for panels that would fit on a 13' x 14' hard top, using 6 of these panels would generate over 1800w and have some room left over for walking access between the panels. It looks like 8 panels could get squeezed onto the same space, which could deliver 2.5Kw under optimum conditions.
Using the standard capacity conversion of six times the rating wattage to figure the daily output, the six panel setup could generate 11Kwh/day and the 8 panel array could generate an impressive 15Kwh daily. The trade off here is the hard panels are less tolerant of impact and abuse. Of course, during foul weather situations, the panels would deliver little power, right when you would want(need) it most...
Still, these kind of figures show the progress made in PV electricity collection and for boats with sufficient area that is appropriate for a solar array, a boat could operate as energy independent for a considerable time.
Fair winds,
Eric
Marina del Rey
--- In electricboats@
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> I believe these are the most efficient PV panels on the market.
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> http://us.sunpowerc
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> I've been looking at the 315s for my modified Duffy launch. They are 41x63 inches and put out 315W at peak.
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> Jim
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> (If anyone is curious, I've got an old Duffy 18 double-ender with an Electric Yacht system and an oversized prop. According to the numbers, 3 of those panels will allow me to do over 4kt on pure solar. There's also room for 12 Trojan T-125s in the battery hold, which would give me a range of around 50 miles at 4.5 to 5 kt. I haven't installed the big battery bank or solar panels yet, but based on preliminary testing of amps-vs-kts the numbers should be pretty close.)
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