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## How to flash the hydro generator
Note: We originally believed the generator to be a self-excited asynchronous generator (SEIG), which depends on residual magnetism to begin generating. The following section was written with this assumption. However, this is not correct! The generator has permanent magnets. For this reason, please ignore this section:
You have to flash the magnetic field of the generator if it loses its magnetic field. Residual magnetism in the generator exciter field allows the generator to build up voltage during start-up. This magnetism is sometimes lost due to shelf time or improper operation, among other reasons. Restoring this residual magnetism is possible and is sometimes referred to as "flashing the exciter field". [^flash-batteries]
