Originally Posted by newhaul
The main thing I look at is the warranty and its enforceability the second is the price
per watt doesn't matter where they are made will they stand behind their product in 25 years when the output falls to 79% of rated output when new.
1. are you really going to have your boat in 25 years?
I cannot say how may do but I estimate that of the cruisers we have met well under 10% of owners still have the same boat after 25 years. Most give up sailing altogether within 10.
2. In 10 years you will be able to buy solar panels
whose total cost of watt for watt replacement will be less than the cost of sending your old panels
to the junkyard by 1st class mail.
3. Can you guarantee grape solar will be in business in 25 years? Right now, the average lifespan of solar companies is about 5 years.
4. Its much more likely that your solar panels
will be damaged by hail or some other natural or unnatural phenomenom well before 25 years.
5. We are talking hundreds here not tens-of-thousands. If you are worried about the loss of $500 of solar panels over much more than a few years than you really should not be buying
6. Long warranties are a sales tactic and a pretty much worthless that is WHY they can offer 25 year warranties. What other industry offers a 25 year warranty? I can't even buy a bowling ball with a 25 year warranty.
7. if your 4 x 100 watt solar panels (total 400 watts) drop to 79 watts each (316 watts) just buy a new panel for $100 and be done with it - then you will have more watts than you started out with. It'll cost you more in time to get the warranty, take the panel to the post office (if that even exists anymore), package it, send it, and retrieve it in the end.
Solar panels are throw away items at this price point.