A portable generator must match the actual load profile. PRP/LTP, single- or three-phase supply, motor starting, voltage quality, runtime, sound and the current manufacturer datasheet all matter.
A high output figure alone does not show whether a unit can supply the intended loads safely. Load type, simultaneous operation, starting currents and operating conditions must be established before model selection.
Define the application and loads first
Record every load that may operate at the same time. In addition to rated output, load type, starting sequence, sensitive electronics and suitable reserve are relevant. Motors and pumps impose different requirements from lighting or resistive loads.
Understanding PRP and LTP
Portable generators frequently state PRP and LTP. These values describe different operating conditions and must not be treated as interchangeable continuous ratings. The current datasheet and intended operating profile remain decisive.
Single- or three-phase?
The number of phases must match the connected loads. Single-phase 230 V and three-phase 400 V applications require a suitable unit. Three-phase models also require attention to phase distribution and possible imbalance.
Starting currents and voltage quality
Motors, compressors and pumps can require substantially higher current during starting than in normal operation. Electronic loads may also require stable voltage and frequency. Simply adding rated load figures is therefore often insufficient.
Runtime, sound and site
Tank capacity alone does not establish reliable runtime. Consumption and usable runtime depend on the model, load point and manufacturer conditions. Ventilation, exhaust routing, weather protection, sound requirements and safe installation must also be assessed.
Technical basis
Selection is governed by current approved manufacturer datasheets and the actual load and site conditions.
Frequently asked questions
Is the stated maximum output sufficient for selection?
No. The operating profile, permitted PRP or LTP rating, duration and type of load, and the conditions of the specific datasheet govern selection.
When is a single-phase generator suitable?
Single-phase versions may suit appropriately designed 230 V loads. The actual consumer structure and connected load must be checked first.
When is a three-phase version required?
Three-phase versions may be considered for suitable 400 V loads. Phase distribution, motor starting and the actual load profile require technical assessment.
How is the required runtime determined?
From consumption, usable tank capacity, load profile and manufacturer data. A general runtime without a specific model and load point is not reliable.
Check the portable selection technically
Send us the loads, operating mode, phase requirement and site conditions. We support technical preselection.
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