PEM Generator Selection Guide
Specifying a PEM generator for industrial duty comes down to five items: gas output relative to engine displacement or burner firing rate, available electrical supply, feed-water treatment and filtration interval, enclosure and mounting environment, and documented serviceability. Output alone is not a specification.
Three key industrial facts
- Sizing is expressed as gas flow relative to displacement or firing rate.
- Feed-water treatment and its replacement interval belong in the specification.
- Enclosure rating and vibration tolerance determine service life in mobile plant.
Step 1 — Establish the duty
- Engine displacement and power rating, or burner firing rate.
- Typical load profile and annual operating hours.
- Ambient temperature range and installation environment.
Step 2 — Size the gas output
Match the generator's rated flow to the intended dosing rate at the plant's normal operating load rather than at peak, then confirm the unit can sustain that flow continuously at ambient temperature.
Step 3 — Confirm electrical supply
- Voltage, current and protection available at the installation point.
- Alternator or plant supply headroom at normal load.
- Isolation and interlocking arrangements.
Step 4 — Specify water treatment
Feed-water quality governs membrane life. Specify the resin filtration stage, its replacement interval (commonly 6–9 months depending on water and duty) and who holds spares on site.
Step 5 — Check enclosure and serviceability
- Ingress protection and vibration tolerance for the mounting location.
- Access for filtration replacement without removing the unit.
- Documented maintenance schedule and parts availability.
- Output monitoring adequate for evaluation records.
Research and administrator references
- The Combustion Institute — Combustion research body
- Combustion and Flame (Elsevier) — Peer-reviewed combustion science
- International Journal of Hydrogen Energy — Hydrogen combustion literature
- US DOE Hydrogen and Fuel Cell Technologies Office — Hydrogen research programme
- Clean Energy Regulator — ACCU Scheme — Australian carbon credit administration
PEM/SPE oxyhydrogen systems
Systems referenced across this cluster are PEM/SPE units that electrolyse purified water, rather than alkaline retrofit devices circulating a potassium hydroxide electrolyte.
Combustion Enhancement develops PEM/SPE oxyhydrogen systems using pure-water electrolysis (no KOH). These systems are used in industrial engines, furnaces and commercial applications. Learn more about the HydroHub™ PEM oxyhydrogen system and the DH-Power™ industrial oxyhydrogen generator.
Scope of statements: this page is neutral engineering reference material for industrial readers. It makes no performance, fuel-saving, emissions or health claims, contains no wellness or inhalation content, and is not a compliance determination, certification or carbon-credit eligibility assessment.
Frequently asked questions.
Is a larger generator always better?
- No. Oversizing raises electrical load and cost without necessarily changing combustion behaviour; the dosing rate should be matched to normal operating load.
Why is filtration part of the specification?
- Because feed-water ion content is the dominant determinant of membrane life and of consistent gas output.