https://blog.voltaicsystems.com/can-panel-charge-battery-pack/ Solar Tutorial and DIY Solar Guides Wed, 07 Aug 2024 16:15:38 +0000 hourly 1 https://blog.voltaicsystems.com/can-panel-charge-battery-pack/#comment-97070 Thu, 01 Mar 2018 15:39:12 +0000 http://80ca4ebf1c.nxcli.io/?p=9343#comment-97070 Hi there,
I have a sunpower 4.4v 4.4w 1A panel.
The output is 5.2v and 0,7/0,8A.
I attach a lipo 3.7v 2.4A battery and a pcb usb.
Everything seems working fine when I’m trying to chage a standard smartphone and after few hours the phone is full, only the battery is lasting much less compared with wall charger (-50%).
Do you know if could be related to the low voltage of the panel, the isolation of wires(panel is using tab wires I solder to the pcb and the battery), or the quality of the pcb (consider I have tried with several ready-made pcb with same results) or it is normal the charge quality is so bad when using 3.7v battery?
Thanks in advance for your help

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