How can I set up a server system to play with my friends?

[MRsuffix]

How can I play with my friends without the farm owner needing to be online?
Can we set up a system like Minecraft java server and play? The electricity of our friend who is the founder of the farm goes on and off.
we also play with 50 different mods.

 

[Odin]

You may want to look into the "Always On" mod: https://www.nexusmods.com/stardewvalley/mods/2677

The electricity of our friend who is the founder of the farm goes on and off.

If you're looking for a company that will host a Stardew game on a server rather than the computer of the person hosting, I don't know offhand of any company that does this, but I'm sure there are options out there.