How do (construction) robots select the Roboport where they recharge?

I can't figure out, how my robots select the recharge Roboport.

Let's say i have 200 construction robots and they have to travel ~150 tiles crossing other roboports. All of them just use just the 3 closest ports to the construction area. So sometimes 20 of them wait for a free charging spot, because only 3 ports are used to recharge. I'd say it would be more efficient if some of them fly back to a more distant port to recharge.

I know i can place more ports near the construction area, but how can i figure out the range they use to recharge? Is the condition, that the recharge ports area covers the build/delivery area?

factorio

Best Answer

For any robot, it knows each roboport's current recharge queue and distance. From that:

<distance to different roboport in tiles> / <queue size of robots waiting> -> min

See: Choosing the post for charging

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How does the Roboport work?

Roboports don't physically connect. All a roboport does is decide your bot network, recharge robots, and give them a home, when they are not in use. All robots move from area to area on their own power. And when not in use, go into a roboport to store themselves.

How do construction robots work?

Construction robots are autonomous floating devices capable of repairing or building the player's structures. They are one of two type of robotic floating devices, the other being the logistic robots. They run on electricity from roboports, or a personal roboport.

How many robots does Roboport Factorio have?

Each personal roboport allows an additional 10 active robots, 30\xd730 range, and 2 charging ports.

How do logistic robots work?

Logistic robots will begin to fill storage chests from active provider chests if there are no other tasks available. The filter that can be set on the storage chest is respected even if items that are actively being pushed to the network can not be stored anywhere else.

Guide to Robots Logistic and Construction drones Factorio 1.0 ⚙️ Tutorial/Guide/How-To

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Alena Darmel, Lachlan Ross, Anete Lusina, Pixabay