[video] Why you should use a resistor when connecting to a battery.

[prometheanfire]

Not sure I should post a link to this here or another forum.

This helps show why a resistor is necessary when connecting a battery to a load (like capacitors in most inverters).

What a resistor gives you is a way to slow down the initial load (electron inrush if you will), allowing you to stay below a fuse rating, if you are using one (you should be).

 

[hwy17]

Looks like great video I'm gonna have to sit down to watch all that with sound.

But I don't think precharging is to save the fuse, fuses don't blow that fast. It's to save the rest of the hardware in the circuit. Mainly the contactor in contactor designs, but I'm not sure what exactly in a FET.

 

[prometheanfire]

That's true forgot about the 'delay' time for fuses. Really it's about protecting all aspects from that initial chaotic bull rush of current.