I have  been  looking at an on-gird 250 watt  48 volt panel (CS5P-250M) made by  Canadian  Solar. unfortunately  the warranty does not  cover marine  use, which is common. Do you any of you have  experience with modifying solar panels so they are more  protected from salt than  land use? The Canadian  Panel is so  cheap,  < $500 that I am willing to take the risk,  since it will  produce so much more  power.

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I'm definitely not an expert on solar panels but I'm seriously in the market for some as well. I would be curious to know what actually makes solar panels "for marine use?" Being outdoors, they have to be rugged no matter what. I would buy them and use them as they are. They're probably OK like they are for use on a boat, and you pay extra, just for the "for marine use" label. I have quite a few things on my boat that weren't made for boats that work just fine or better and cost a fraction of the cost. 

I have  made a huge error.  The Candian  Solar panels will NOT charge a  48 volt system, since they  are "on-grid"  panels that have  a working  voltage near  48 volts. You need, " off grid panels like the one below that has  a higher working  voltage to  get the  electricity to  " flow"  to the batteries properly. There panels are apparently  quite  sturdy and will not need to  be " marinized:

 

 

http://www.ecodirect.com/Kaneka-GSA060-Solar-Panel-60-Watt-48-Volt-...

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I've never had a problem with a solar  panel installed on my boat.  As long as the mounting is secure I don't see a problem. Just make sure no one can walk on it.  IMO I think they are just protecting themselves from a bad installation on a boat not salt water. Otherwise they would not allow them to be mounted along on land on the coasts of Canada either.

 

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