User Tools

Site Tools


lifestyle:faq_solar_generator

Differences

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

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
Next revision Both sides next revision
lifestyle:faq_solar_generator [2020/05/20 11:28]
frater_secessus [Charging from solar panels]
lifestyle:faq_solar_generator [2020/05/20 11:40]
frater_secessus [Charging from solar panels]
Line 54: Line 54:
 ====Charging from solar panels==== ====Charging from solar panels====
  
-Charging these devices from solar panels will probably be [[electrical:solar:output|slower than you might expect]].  +Charging these devices from solar panels will probably be [[electrical:solar:output|slower than you might expect]]:
  
- +  * in the absence of an [[electrical:solar:charge_controller#mppt|mppt controller]]((sometimes present on higher-end devices)) [[electrical:solar:output#charge_controller_type|panel output will be hamstrung by battery voltage]].  You may see a device listing 60w max input but specifying a 100w panel for use with it, and now you know why. 
- +
-  * in the absence of an MPPT controller((sometimes present on higher-end devices)) [[electrical:solar:output#charge_controller_type|panel output is hamstrung by battery voltage]].  You may see a device listing 60w max input but specifying a 100w panel for use with it, and now you know why. +
   * devices with 3S lithium cells will hamstring the panels even worse((3S Li voltage can be as low as 9v, and maxxes around 12.5v.))   * devices with 3S lithium cells will hamstring the panels even worse((3S Li voltage can be as low as 9v, and maxxes around 12.5v.))
   * long wire runs (as seen with portable panels set outside) result in voltage drops   * long wire runs (as seen with portable panels set outside) result in voltage drops
   * sunlight is limited to a certain number of hours.  Some units require more hours of charging than there are hours of sunlight in a day.    * sunlight is limited to a certain number of hours.  Some units require more hours of charging than there are hours of sunlight in a day. 
  
-Devices with internal mppt controllers will cost more but will make much better use of panels for charging. +Poly panels will typically [[http://bdp.mousetrap.net/index.php/2019/11/13/pwm-loves-poly/|make slightly more power]] on normal (non-MPPT) devices due to poly'lower voltage / higher current.  Devices with internal MPPT controllers will use both panels equally well because they decouple battery and panel voltages. 
- +
-Poly panels will typically [[http://bdp.mousetrap.net/index.php/2019/11/13/pwm-loves-poly/|make more power]] in this scenario due to their lower voltage / higher current.((mppt-equipped models will charge equally as well from both panel types))+
  
 Note:  it is possible to [[https://www.youtube.com/watch?v=yXNW-4fNZVk|place a small DC-DC converter between the panel and input port]] to get the panel up near max power.  Doing so will make it even more important to manually disconnect the panel when charging is complete. Note:  it is possible to [[https://www.youtube.com/watch?v=yXNW-4fNZVk|place a small DC-DC converter between the panel and input port]] to get the panel up near max power.  Doing so will make it even more important to manually disconnect the panel when charging is complete.
lifestyle/faq_solar_generator.txt · Last modified: 2020/11/22 17:56 by frater_secessus