Help me choose a pre-charge resistor size

[TheBigFour87]

Just my luck! I ordered a 100W 20 ohm resistor before I learned about the extremely useful GUID in the resources about designing our own pre-charge inverter switch posted by one of the members here.

I now use the Wirewound Resistors 100 Watt 20 Ohm as a pre-charge resistor. Has anyone else ever used it? Is it working? Will it be enough to pre-charge the inverter without a spark?

I got Two 48v 200A batteries in parallel and Growatt SPF5000es. Any suggestions will be appreciated.

 

[RedandBlue90]

Anything less than 50 ohms will work. Lower resistance will get a little warm but only for two or three seconds.