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--- lifestyle:faq_solar_generator [2020/05/20 11:23]
frater_secessus [technical discussion]
+++ lifestyle:faq_solar_generator [2020/05/20 11:28]
frater_secessus [Charging from solar panels]
@@ Line 56: / Line 56: @@
 Charging these devices from solar panels will probably be [[electrical:solar:output|slower than you might expect]].
-Devices that claim to have internal solar controllers (probably mppt) will cost more but will make much better use of panels for charging.((4S or greater Li configurations will also charge better from solar due to higher voltage))
   * 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.))
+  * 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.
+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 more power]] in this scenario due to their lower voltage / higher current.((mppt-equipped models will charge equally as well from both panel types))

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