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RK Series
What´s the maximal wire length?
The maximal supported wire length is 800m / 1.7 kOhm.
Note that on such lengths a poor connection could be enought to cause signal issues.
You should consider to separate your lawn and install two instead of only one robot.
This would also reduce the time your robot needs to mow, what equals in a higher life span and more freetime to use your lawn.