Calculating size of pre-charge resistor

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Mamosa
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Joined: Tue Oct 27, 2020 9:13 am
Calculating size of pre-charge resistor

Post by Mamosa »

I am trying to calculate the size of required pre-charge resistor for my 2x60AHV powered with 48V Li-ion battery.

According to the documentation, capacitor bank is 2820uF. I guess one second of precharging would be enough for me. Using the formula "(charging time / 3) / capacitance in farads", I get a result of 118 ohms. I will take 120ohm or 150ohm. But, how will I know how many watts I need?

Will 20W do the job? Maybe some link?

Thx!
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Basicmicro Support
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Joined: Thu Feb 26, 2015 9:45 pm
Re: Calculating size of pre-charge resistor

Post by Basicmicro Support »

118 ohms is reasonable. 1/4 watt is more than sufficient. 1/10watt would probably work in most cases as well.
Mamosa
Posts: 5
Joined: Tue Oct 27, 2020 9:13 am
Re: Calculating size of pre-charge resistor

Post by Mamosa »

Thx!
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www.mamosa.hr

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