Why German battlecruisers were poor colonial patrol ships

Were three German battlecruisers enough to protect the German colonial empire?

No; they were too few for global coverage and too short-ranged and support-intensive for efficient colonial deployment.

Three battlecruisers would be too few for global coverage and excessive for many colonial tasks. Their short range and heavy support requirements made them awkward assets outside Germany, a problem illustrated by Ottoman experience with ex-German capital ships. Effective overseas presence demanded endurance and a support network, not merely concentrated combat power.