Marinising Solar PV Modules
When specifying a marine solar pv system there are a number of considerations which can make quite a difference to the lifespan of the system.
Solar PV Warranties
The issue with warranties is that there are very few brands of pv modules that are warranted for marine use, and those that are either have a very short warranty, or are disproportionately expensive.
Most large main-stream solar manufacturers exclude marine or mobile use from their warranties. However, in over 20 years of supplying solar panels for marine use, we are happy to say that (in general) there is no real reason not to use standard solar panels - assuming they are of good build quality.
Almost all good quality modern solar panels use anodised aluminium frames, and many are tested in a salt mist environment. The better ones have an IP68 rated junction box fitted to the back of the panels for the cables to connect to the pv module. Some manufacturers such as LG and Panasonic fully pot their junction boxes, ensuring that nothing can get inside to corrode the cell contacts & diodes.
Solar PV Connectors
The majority of solar pv modules these days are supplied with industry standard "MC4" connectors. Depending on their quality, they are often only rated at IP66. We've also noticed that some MC4 "compatible" connectors aren't as good as the original connectors from Staubli - and when you combine the two, the seal and connection isn't as good as if the two connectors are of the same brand.
One solution to this is to eliminate the connectors from the potentially harsh environment outside of the boat. You could remove the supplied solar cables (with MC4 connectors) and replace them with longer solar cables which run though a suitable cable gland and terminate inside the boat (either at an isolator / mcb, or at the solar controller).
However - as mentioned above, some top quality solar panels have fully potted junction boxes that prevent this from being an option. One solution in this case is to cut off the connectors and extend the supplied cables with a very careful splice, using suitable splice connectors and 2 layers of adhesive lined heatshrink.
Solar PV Mounting / Brackets
Secure mounting is obviously essential on any sea-going vessel, and is perhaps one of the biggest challenges on smaller boats where the number of suitable locations to mount the solar pv panel/s are very limited.
In our experience, many boat owners end up having a custom mounting bracket fabricated to attach to their safety rails or radar arch. If there is more space available, standard plastic or aluminium mounting brackets can sometimes be used. The mounting solution is very often individual to the boat.
In Summary ...
If you are considering solar pv panels for your boat - the one thing to look out for is quality. We offer to fully pot junction boxes for clients as well as extend the solar pv cables, thus making the majority of the solar panels we supply suitable for use in a harsh off-shore marine environment. Inland boats have less of a corrosion issue as there is less salt in the air.
Contact us to discuss your requirements. Alternatively, feel free to comment on this article and we'll do our best to reply.