How many Duplicants can one Electrolyzer support?
OxygenMedium
Balance oxygen, hydrogen, water and pumping power before expanding a SPOM.
Eight reliably supplied Duplicants, not nine
An ordinary Duplicant consumes 0.1 kg/s of Oxygen, or 60 kg per 600-second cycle. A continuously running Electrolyzer produces 0.888 kg/s: 532.8 kg per cycle, equivalent to 8.88 ordinary Duplicants. Nine need 0.9 kg/s, so one machine falls short even before interruptions. Breathing traits change the demand.
Water and hydrogen balance
One Electrolyzer takes 1 kg/s of Water and produces about 0.112 kg/s of Hydrogen Gas alongside its oxygen. Over a full cycle that is 600 kg of Water consumed and 67.2 kg of Hydrogen produced. One Hydrogen Generator consumes 0.1 kg/s at its 800 W rating: it cannot burn the entire 0.112 kg/s stream by itself.
Pumps are part of the budget
| Buildings | Power use | Size |
|---|---|---|
 Electrolyzer | 120 W | 2×2 tiles |
 Gas Pump | 240 W | 2×2 tiles |
 Mini Gas Pump | 60 W | 1×2 tiles |
A Gas Pump moves up to 0.5 kg/s for 240 W; a Mini Gas Pump moves 0.05 kg/s for 60 W. A mini pump cannot carry the full hydrogen stream from one continuously running Electrolyzer. Two ordinary oxygen pumps and one hydrogen pump draw 720 W when all three run; add the Electrolyzer and the instantaneous total is 840 W. Average operation may be lower, but that does not turn an 800 W rating into 840 W.
Include the water pump, filters, automation and any cooling in the actual layout budget. A battery covers temporary mismatches only while it has stored energy. Start the system with an external supply or charged battery rather than assuming an empty hydrogen line can power itself.
Heat and blocked output
The Electrolyzer’s gases have a 70 °C minimum output setting, not a guarantee of cool oxygen. Hotter input can produce hotter gas. Protect Mealwood and other farms from that heat, and leave a route for gas removal: pressure, missing Water or missing power can reduce the output below the arithmetic above.