Differences

This shows you the differences between two versions of the page.

--- electrical:solar:charge_controller [2022/08/09 14:21]
frater_secessus [Types of charge controllers]
+++ electrical:solar:charge_controller [2022/10/12 17:37]
frater_secessus [MPPT] wayback link
@@ Line 49: / Line 49: @@
 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).
-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.
+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://web.archive.org/web/20221012213623/https://www.redalyc.org/journal/849/84959429001/html/)), which may or may not justify the added cost on its own.
@@ Line 114: / Line 114: @@
 **MPPT is effectively required** when:
+  * when one needs to squeeze every watt out of the panel
   * using panels with nominal voltages higher than the battery bank voltage, like 24v panels with a 12v bank.   To be fair, [[http://mouse.mousetrap.net/blog/2021-07-09-solar-back-online-.html#pwm-spare-saved-my-bacon|one really can use higher-voltage panels with PWM and 12v banks]] -- they just end up running at about half power.
   * space available for panels is limited, as on a sailboat or small vehicle

RV and vandwellers wiki

User Tools

Site Tools

Differences

Page Tools