An internal combustion engine and a gear shaft includes a first axial side, a second axial side opposite from the first axial side, a radially outer surface, a gear interface at the radially outer surface, a central passageway extending axially from the first axial side to an internal junction, an upper passageway extending radially upward from the internal junction to the gear interface, and a cavity disposed radially below the internal junction, extending radially downward, terminating between the internal junction and the gear interface, and configured to receive debris conveyed with the lubricant.

An internal combustion engine and a gear shaft includes a first axial side, a second axial side opposite from the first axial side, a radially outer surface, a gear interface at the radially outer surface, a central passageway extending axially from the first axial side to an internal junction, an upper passageway extending radially upward from the internal junction to the gear interface, and a cavity disposed radially below the internal junction, extending radially downward, terminating between the internal junction and the gear interface, and configured to receive debris conveyed with the lubricant.

A system, module, and method for generating reliable, high quality power on demand and off-grid includes a photovoltaic array for delivering DC power; a generator having a size ranging from about 5 kW to about 30 kW, and comprising an engine powered by hydrocarbon gas filtered through a coalescing filter and comprising an extended lubrication system; an uninterruptible power supply (UPS) comprising a storage battery, the UPS being coupled to the photovoltaic array for receiving the DC power, and to the generator by a bi-directional inverter for receiving, transmitting, and qualifying DC or AC power; and an intelligent controller coupled to the UPS for controlling output of the DC or AC power to at least one air compressor capable of providing compressed air to one or more pneumatic devices.

A system, module, and method for generating reliable, high quality power on demand and off-grid includes a photovoltaic array for delivering DC power; a generator having a size ranging from about 5 kW to about 30 kW, and comprising an engine powered by hydrocarbon gas filtered through a coalescing filter and comprising an extended lubrication system; an uninterruptible power supply (UPS) comprising a storage battery, the UPS being coupled to the photovoltaic array for receiving the DC power, and to the generator by a bi-directional inverter for receiving, transmitting, and qualifying DC or AC power; and an intelligent controller coupled to the UPS for controlling output of the DC or AC power to at least one air compressor capable of providing compressed air to one or more pneumatic devices.