I have double glass sealed windows. They block about half of solar energy that goes to my solar panel when it is indoors.
Winter also ruins the amount of solar energy to the solar panel.
The LM317 Calculator is wrong like most LM317 circuits on the internet. R1 is 240 ohms for the more expensive LM117. It is supposed to be 120 ohms for the LM317.
A Ni-MH battery is charged with current, not voltage. Set the LM317 with a single resistor as a current regulator at 350mA. Then if the battery was partially charged it will be over-charged if you just time the charge.
A battery charger IC detects when the battery is fully charged then stops the charging to prevent over-charging.
The LM317 Calculator is wrong like most LM317 circuits on the internet. R1 is 240 ohms for the more expensive LM117. It is supposed to be 120 ohms for the LM317.
A Ni-MH battery is charged with current, not voltage. Set the LM317 with a single resistor as a current regulator at 350mA. Then if the battery was partially charged it will be over-charged if you just time the charge.
A battery charger IC detects when the battery is fully charged then stops the charging to prevent over-charging.
All rechargeable batteries are charged with current.
LM317 set at 3v-diode drop(.8V)=2.2V ideal voltage and 500mA is sufficient for charging for around 8hours.