yes are there any alternatives for comparator lm2231 and MOSFET pmv30un

 

Are there particular parts that are expensive, and you need alternatives, or is everything expensive? That circuit is not terribly elaborate and if it's too expensive, I'm not sure there's much anyone can do.

is i possible to use comparator ic lm358 for the same purpose ??

 

is i possible to use comparator ic lm358 for the same purpose ??

The LM358 is an op-amp, not a comparator, and not a good choice here because it requires at least 3V to operate. That's the absolute most your panel can output.

I don't fully understand that circuit but the shown op-amp is a rail-to-rail type and I suspect that's important for that circuit. LM358 can approach the negative supply rail but it is not rail-to-rail. It cannot sense voltages within about 1.5V of the upper rail.

You need a low-voltage, rail-to-rail op-amp.

 

Found this protection circuit can i make individual circuits for each capacitor and then connect them in series

 

Found this protection circuit can i make individual circuits for each capacitor and then connect them in series

I think that's a better choice.

 

I think that's a better choice.

thank you for all the help ill upload the final project files which might help others

 

can someone suggest some other circuit cant get all the parts here and ordering online is very costly

a while back i ordered some chips, the ALD8100xx. never ended up using them, but they are supposed to be your one-chip solution to balancing supercaps while charging in series.
http://www.aldinc.com/pdf/ALD8100xxFamily.pdf

 

a while back i ordered some chips, the ALD8100xx. never ended up using them, but they are supposed to be your one-chip solution to balancing supercaps while charging in series.
http://www.aldinc.com/pdf/ALD8100xxFamily.pdf

thank you for sharing but i have made the above circuit and it works perfect voltage never exceeds 2.69v.
now that it works can i charge the capacitors with higher voltage coz they cannot over charge and will it increase the charging speed ??

 

thank you for sharing but i have made the above circuit and it works perfect voltage never exceeds 2.69v.
now that it works can i charge the capacitors with higher voltage coz they cannot over charge and will it increase the charging speed ??

The answer is, "it depends". First let me point out that your capacitors will have a maximum current rating, and you don't want to exceed that.

Your ability to supply current depends on the impedance of your power supply. Just raising the voltage might not increase the charging rate. You need to analyze your system to identify the bottlenecks before you can make smart adjustments.