From Unofficial Stationeers Wiki
This Generator requires a supply of mixed gases (Hydrogen/Oxygen) in order to work. It produces 24KW per tick per Kpa of supplied pressure with a 64/36 (H/O2) mix, or 38.3KW with a welder fueltank. It is highly suggested that you use a pressure regulator on the input. (Max observed output of 420KW per tick has been observed, this also burned out multiple cables of both types.)
Suggested use (early game) - Overnight/emergency station battery recharging. Late Game - Can be used in place of all solar as long as sufficient Battery reserves and atmospheric systems are in place.