Find the family.
Then the exact fit.

20 kVA–2.5 MVA per unit common; parallel fleets to tens/hundreds of MW; diesel/gas/HVO

100 kVA–20 MVA common rental inventory; LV–33 kV, larger custom fleets

LV through 33/38 kV; 400–4,000 A; breakers, RMUs and temporary lineups

1–250 MVA; 11–230 kV common; mobile/skid/container; larger engineered

LV through 33/66 kV; 16–630 mm²; flexible trailing/rental cable with quick connectors

10 kW–7 MW; 120–690 V direct and MV via transformer; resistive/reactive/combined

10 kVA–2 MW; modular, containerised and rental battery/flywheel systems

30 kW–5 MW; 50 kWh–20 MWh; trailer/skid/container

20 kVA–2.5 MVA trailer/container; towable, road-legal and parallel variants

5–250 MVA; 13.8–230 kV common; trailer/skid

500 kVA–100 MVA common; LV–138 kV; larger transport-engineered

32–6,300 A; 120–690 V; portable boxes through containerised LV boards