tpi wrote:
At least from my limited knowledge, the 24 volt panels work for my friend on his bus.
1. The physical size works for him. Works with what is already on the roof.
2. Running at a higher voltage it appears from the controller documentation that the wiring sizes can be smaller. Wiring from panels to controller-which translates voltage to what is appropriate to batteries.
3. Cheaper per watt.
Thanks for the input. Ordered the panels.
Too late to discuss since you've ordered already, but:
1) Sizes of 250W panels differ very little from brand to brand or model to model. So, any 250W panel will work "with what is already on the roof".
2) Wiring sizes are always smaller for 24V panel than for 12V, obviously. This is not brand-specific.
3) Also not brand-specific. Most any 24V panel is cheaper per watt than 12V.
However, what is important - and what was not addressed, is the frame quality - profile and thickness.
Also, what Don Pianotuna mentioned - the number of diodes. Not every manufacturer provides these data.
tpi wrote:
https://www.solarblvd.com/index.php?cPath=1_270
Is there any on this list notable for high quality?
I don't think he cares about spending a few more bucks if it reliably translates to quality.
I don't see anything. Solarworld perhaps. New or little known Chinese brands are a gamble - no information and quality varies. For better assurances you have to pay more, and it would be not "a few bucks" difference. I personally don't view $100 difference as a major setback when talking about a long-term project like 15-20 years. If your friend's goals are not of this scale, then I wouldn't worry at all.