Hey Cal-
Good to hear you haven't given up on e-boating. J
For 40amps and 48v, you're looking at about 2kw.
To get the most power per area and to keep things light, you'd want to not skimp on your panels---ie. don't buy 10-12% efficient, $1/watt panels that are framed and heavy.
Rather, you'd want to invest in the 20% efficient, unhoused SunPower flexible arrays which run about $2/watt and available any day, online and on ebay. For $4k, you can get your 2kw.
For 2kw, at 20% efficiency, you need at least 10sq-meters of solar cells.
And practically, at our latitude, you'd still not get 2kw, but let's say this did tell the whole story.
You'd need a bimini area approx. 6.5ft x 16ft to get your 2kw. Do you have that much roof space? How about half of that?
Here's a 135watt Sunpower panel:
Pick up 16 of those and for less than $5k you're cooking with solar.
How deep are your pockets?
-Myles
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com]
Sent: Monday, May 25, 2015 9:56 PM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Need source for 48v. panel controller and panels-- my next step !
Now that the outboard is done, battery bank hooked up and all works great, I need to look at extending the run time. Not liking using a generator, so perhaps panels would do that ?? I was thinking of one 48 volt controller, and maybe four decent sized panels on a " Bimini " type top. I have one top now, but could build anything to fit the panel size. if I could get 40 amps, that would be continuous power at cruise speed. That might be asking a lot at 48 volts, so maybe half of that would work ?? Batteries are now marine deep cycle lead acids.
What have others done with a reliable controller would be a good start. Maybe a brand to look for, or a place that could supply a system of panels and controller would also be helpful. I have done biz in China, so maybe there is a tested system some one has used ?? Flexible panels preferable for an arched top, but I could be tempted to build a flat top with stiff panels, as flat ones are mostly cheaper, higher output. Need the panels here first, to fit on any top design correctly.
Thanks, I would welcome any ideas on products to buy ---------- Cal
Posted by: "Myles Twete" <matwete@comcast.net>
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