electrical:solar:charge_controller
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electrical:solar:charge_controller [2022/08/03 19:58] frater_secessus [connection order] |
electrical:solar:charge_controller [2022/08/09 14:12] frater_secessus [MPPT] |
high for system needs((particularly with higher than nominal 12v panels )) the controller performs a DC-DC conversion to bring the voltage down to a directly usable level. Because **current through a conductor is directly proportional to voltage**((https://en.wikipedia.org/wiki/Ohm%27s_law)) this downconversion effectively turns excess voltage into increased amps.(minus conversion losses). | high for system needs((particularly with higher than nominal 12v panels )) the controller performs a DC-DC conversion to bring the voltage down to a directly usable level. Because **current through a conductor is directly proportional to voltage**((https://en.wikipedia.org/wiki/Ohm%27s_law)) this downconversion effectively turns excess voltage into increased amps.(minus conversion losses). |
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This ability to decouple panel and bank voltage can result in 10%-30% more power harvested from 12v nominal panels than with a PWM controller. Marketers like to call this "boost" or "gains" but it really just full capture of whatever power the panel[s] can provide under given conditions. | This ability to decouple panel and bank voltage can result in 10%-30% more power harvested from 12v nominal panels than with a PWM controller, depending on conditions. //Average// daily production with MPPT is typically ~+15%((https://www.redalyc.org/journal/849/84959429001/html/)), which may or may not justify the added cost on its own. |
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=== "boost" effect === | === "boost" effect === |
> The reason for the low side switching is the intersection between physics and economics. N-channel field effect transistors are faster, better, cheaper than P-channel parts. The designer can A) use good parts in a simple circuit or B) use more expensive not so good parts or C) make a complicated circuit that uses 18 volts to control a 15 volt switch.((http://www.cheaprvliving.com/forums/showthread.php?tid=24605&pid=307539#pid307539)) | > The reason for the low side switching is the intersection between physics and economics. N-channel field effect transistors are faster, better, cheaper than P-channel parts. The designer can A) use good parts in a simple circuit or B) use more expensive not so good parts or C) make a complicated circuit that uses 18 volts to control a 15 volt switch.((http://www.cheaprvliving.com/forums/showthread.php?tid=24605&pid=307539#pid307539)) |
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| ===== further reading ===== |
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| * [[https://www.solar4rvs.com.au/buying/buyer-guides/choosing-the-right-solar-charge-controller-regulat/|exceptional article on charge controllers]] by Solar4RVs |
electrical/solar/charge_controller.txt · Last modified: 2024/04/16 20:28 by frater_secessus