FWIW--the manual for the Blue Sky 2000 has a good explanation of when MPPT helps the most. It is on page 5 of this manual: http://www.blueskyenergyinc.com/uploads/pdf/Manual_BSE_SB2000.pdf Briefly, the colder the panel and the lower the battery voltage, the more MPPT helps. For hot temps and batteries that are not deeply discharged, MPPT might not be worth the extra price over simple PWM. Of course, you can buy a 12V 10 A MPPT controller on ebay for $12.57! Richard |
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