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Wrenches, When adding a modern charge controller to an existing off grid system as part of an array upgrade, we often have to mix charge controllers and their widely differing control algorithms. A common combination is to add a new array with a FM60 or Classic to an older system with a C40 or a Solar Boost SB50. Typically, the new array is larger than the original array, but not always. How do you adjust controllers when the bulk/absorption/float transitions vary widely? Typically we set to the same voltages, figuring that the controllers will determine their own respective dominance - that is, which unit drops out first in absorption), and it should have little effect on finishing a charge cycle. But can you describe (and defend) any particular ways of setting up unmatched combinations, such as I have described? For example, the C40 has a fixed two-hour absorption, and the FM and Classic have minimum and maximum times (the FM just max, along with absorb end amps). Typically the more expensive and more efficient controller will be on the larger array. How would you set up this combination, and other common situations? Thank you in advance for the collective wisdom, as usual. Allan --
Allan Sindelar [email protected] NABCEP Certified Photovoltaic Installer NABCEP Certified Technical Sales Professional New Mexico EE98J Journeyman Electrician Founder and Chief Technology Officer Positive Energy, Inc. 3209 Richards Lane (note new address) Santa Fe, New Mexico 87507 505 424-1112 www.positiveenergysolar.com
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