How do i calculate no of caps required to replace a battery. If i am given a voltage of battery and capacity of battery and datasheet of required capacitor
Asked
Active
Viewed 74 times
-3
-
Show us your calculations and tell us why you think your result might be wrong. – Andrew Morton Mar 24 '18 at 21:49
-
I am new here i did not knew the rules. Anyways i have edited the post. – Chanchal Agrawal Mar 24 '18 at 21:55
-
1@ChanchalAgrawal: Minor points. 'F' or 'farad'. 'A' or 'amp/ampere'. 'V' or 'volt'. This is covered in the SI standard. – Transistor Mar 24 '18 at 22:05
1 Answers
2
One of the advantages of batteries is that they hold the voltage reasonably constant as they discharge and the voltage only drops off suddenly at the end. The voltage on a capacitor, on the other hand, falls continuously during discharge and most rapidly at the start.
Figure 1. Capacitor discharge curve through a constant resistance. Source: Electronics Club.
I think your best approach to this problem is to treat it as an energy problem. Assume that you can get all the energy out of the battery and all the energy out of the capacitor even though the voltage is falling.
- Work out the energy stored in the battery.
- Find the formula that relates capacitance, voltage and energy. You have the voltage (240 V) and the energy (from 1 above). Now you can work out C.
Post your answers and we'll check them for you.
Transistor
- 168,990
- 12
- 186
- 385