Solar Charge Controller Circuit Using 555

I am planning to make this solar charge controller.

Solar charge controller circuit using 555. The cmtp02 was a good price so i bought one rated at 10a on the chance it actually worked. The first one can be built using a couple of 555 ics and a few other linear components the second optin is even simpler and uses very ordinary ics like lm338 and op amp ic 741. 18 to 20v output voltage range. Suddenly i realized i could redesign the charge controller circuit using the 555 chip and greatly simplify the circuit and reduce the part count.

It s an automatic switching circuit that used to control the charging of a battery from solar panels or any other source. Since the 555 chip is so ubiquitous he figured it was a fantastic way to simplify his charger even if he wasn t using the chip in the manner for which it was originally designed. I bought some 24v solar panels cheap and was looking for a cheap charge controller for them. 16w includes power dissipation of d3 typical dropout voltage.

It did work but as many people found the cutoff voltage was higher than desired. It s a 555 based simple circui. Note that the 555 timer is not being used as a timer but is being used for its internal components. Cmtp02 solar controller circuit background.

A couple of simple yet effective solar panel optimizer charger circuit are explained in this post. I want to design the same circuit for our mobile battery having rating 2900 mah 11 02wh nominal charge voltage 3 8 v limited charge voltage 4 35 v as per any anroid mobile battery can i make the charger portable using the same pic based mppt technique or i should go for linear technology or any other method mppt method to make the circuit portable. Hello friends today i am back with another project called diy automatic solar charge controller. Diy automatic solar charge controller.

I would like to understand the way the components work to switch from charging to dumping and vice versa at set points. Solar charge controller specifications. 50w 4a 12v nominal open circuit voltage.