Solar panel efficiency

Paul, ALL solar panels decrease in output with an increase in tempreture.
You can download the BP SX60 PDF file as an example to look at here:
http://www.bpsolar.com/ContentDetails.cfm?page=40
My personal preference is for the BP panels because of quality and smaller size compared to others.

Paul..according to my supplier the uni-sol panels operate very effeciently in high temperatures , they are also unbreakable ... being made of steel . unfortunately they are also quite large for thier power out put and only go up to 64w..but it probably depends on what you already have and what would compliment that . cheers

Thanks Oziexplorer

Staring at the www.bpsolar.com graph for the BP SX40 and 50 i swear, and so do the people in my house, that the highest current output is at 75 degrees celcius and reduces as the temperature reduces to O degrees. Whereas looking at the same graphs for Sharp, Solarex, Kyocera etc they clearly reduce current as temperature increases, optimum being at 25 degrees. Maybe the optimum for the BP is factory set at the higher temperature. Maybe this all relates to something internal in a panel i don't know about and i am reading the data incorrectly. Am happy to admit i am reading this wrong but if i am then as a matter of general interest i'd like to know how. Ta. But you are totally right about weight and dimension advantage over others, except maybe for my 11W flexible unisolar panel which is designed for a boat and is okay to be walked on, pity they don't make them above 32W - but too expensive anyhow.

you seem a little confused oziexplorer...the page that you refer to is about multicrystaline panels... but you swear by polycrystaline panels . What I read is that multicrystaline is most efficient in certain conditions . Also kyocera panels have a 25 yr warranty and bp a 20 yr warranty ...but i will still stick with the unbreakables..accidents can and do happen..cheers