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lifestyle:faq_solar_generator [2020/05/20 08:28]
frater_secessus [Charging from solar panels]
lifestyle:faq_solar_generator [2020/05/20 08:40]
frater_secessus [Charging from solar panels]
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 ====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'​s ​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: 2020/05/20 08:40 by frater_secessus