Cruisers Forum

  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
Thread Tools Search this Thread Rate Thread Display Modes
Old 06-11-2010, 12:06   #1
Registered User

Join Date: Oct 2010
Location: Blue Mountain Ont
Boat: Beneteau Oceanis 400 40 ft "Camp David
Posts: 605
Solar Size

Guys, I am new to the forum and know little about solar panels.

I am thinking of installing a solar panel or panels on my Beneteau Oceanis 400. Currently I have 4 6-volt golf carts, total amp hrs 464, capacity. We cruise georgian bay. Have a Honda 2000, Balmar 100 amp and three stage regulator.

My Link 10 shows that I use about 75 to 90 amp hours a day at anchor, mostly the Adler Barbor Cold Machine or should I say Cool Machine (LOL).

My plan is to mount a panel on the cross bar btween the two davits or high at the aft of the Bimini.

Can anybody suggest a good make of panel and size of panel to use? Are two 80 watt better than one 160 watt? Any good suppliers to purchase from? I am surprised at the weight of the panels, does this become an issue if mounted on the bimini, I am not sure it can take 50 lbs?

Many thanks as this is my first post.

Camp David
CampDavid is offline   Reply With Quote
Old 06-11-2010, 12:37   #2
Moderator Emeritus
roverhi's Avatar

Join Date: Aug 2005
Location: Carlsbad, CA
Boat: 1976 Sabre 28-2
Posts: 7,505
Send a message via Yahoo to roverhi
I ran my batteries down on the trip to Hawaii. Have 2 130 watt Kyocera panels but they didn't keep up with my minimal usage in mostly overcast conditions. I use less than 30 amps a day and had drained the batteries down to about 50% After 12 days. Even another 3 1/2 days of mostly sunny weather didn't get the batteries up to full charge. Overcast cuts the production down by at least 80% and even a slight haze will halve the output. Max generation is between 10 and 2, believe that would be 11-3 with daylight savings. Before and after that, production falls off significantly. You may do better being so near the Polar Bear's perpetual daylight in summer but doubt it. Boat heel can seriously affect, either positive and negative, output while sailing. Also boat orientation to the sun can have an effect. On my downwind slide to Hawaii, I was pretty much sailing into the afternoon sun so had very little production after 3pm because of shading by the sails.

Unless you have an overwhelming desire to be PC with the 'Green' crowd, a single panel isn't going to do you much good for the expense. There are some very large panels that put out 200 watts plus but they take up a good deal of real estate. If you are going to use 130 watt panels, would think you'd need at least 4 panels to meet your needs and two to have any significant effect.

FWIW, We've lived on solar power for more than 10 years and my boat is normally totally soiar self sufficient. You can never have too many panels.
roverhi is offline   Reply With Quote
Old 06-11-2010, 12:40   #3
Registered User
GeoPowers's Avatar

Join Date: Dec 2008
Location: Gulfport, MS
Boat: Beneteau 393
Posts: 954
Images: 27

As far as panel sizing goes, I attached a spreadsheet I created a while back to figure out electrical consumption. It also has some tools to figure up amps (and amp hours/day) when you know the watts and voltage for a given solar panel. It works for getting to the math behind what you really need as far as power supply/demand goes..

There are lots of brands out there- I often browse as a source to see where prices are.

Can't wait to get ours after we move to the East Coast!

Attached Files
File Type: xls Power Consumption worksheet final.xls (59.5 KB, 288 views)
GeoPowers is offline   Reply With Quote
Old 06-11-2010, 12:50   #4
Registered User

Join Date: Aug 2009
Location: between the devil and the deep blue sea
Boat: a sailing boat
Posts: 20,421
Sunpower - more Watts from square ft than Kyocera, Siemens or BP.

Here, as shown in a German supplier, probably way cheaper if you find a US source:

You can mate them with a Votronic MPPT regulator.

Good idea to make the rack adjustable, so that you can angle your panels towards the sun - huge gains in Amps!

barnakiel is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Solar Panels, What Size Wire ? Banjo Electrical: Batteries, Generators & Solar 14 27-09-2010 19:13
Help Me Size My Solar Array kb79 Electrical: Batteries, Generators & Solar 10 24-08-2010 13:00
Recommended Wire Size for Solar off-the-grid Electrical: Batteries, Generators & Solar 9 02-08-2010 20:05
Determining Size of Solar Panel/Battery Triton318 Electrical: Batteries, Generators & Solar 2 28-07-2010 13:11

Advertise Here

All times are GMT -7. The time now is 17:09.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.