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Andoil pan 4 said:The only consistency I have found in the government is stupidity and incompetence at all ranks, all levels and in all departments.
And usually these clueless people are getting overpaid, stupidity, or not.1
The older 24 volt, 72 cell panels are comprised of 5" cells and ran upwards of 200 watts. The Sunpower 72 cell panels did go up to about 230 watts. These were all approx. 32" x 65"
Todays 290 watt plus 24 volt panels are composed of 6" cells. They have a typical size of approx. 39" x 78"1
One thing about Blue sky controllers I don't care for is their low Voc. limit. This particular one, the SB3000 has a paltry 50 volt open circuit maximum. For a 24 volt system it really is useless as a single 24 volt panel by itself can hit 50 volts.1
An MPPT controller, (a real one) will tell you the maximum Voc. of the solar input. You might be able to wire your panels up to 5 at a time , in series. As mentioned above. Don't just start plugging things together, design your system.1
The textbook you need to buy is another $125.00. I'm sure the cost has risen since I took courses.1