how can i do if the charge of system is not neutral?

Hi, everyone, I have a question about the charge of model system.
My model system includes 10000 charged LJ particles. And I need to compute the long-range Coulombic energy. So i want to know, how can i do if the charge of system is not neutral. Can you give me some suggestions? Best wishes!

Yours,

Jing

LAMMPS will do it and warn you that the system is
not neutral. Stan can comment on whether that
is a good idea or not.

Steve

Steve, thanks very much for your sincere help. Best wishes!

Yours,

Jing