Find the family.
Then the exact fit.

0.5 kVA–5 MW system range; single phase below about 20 kVA, three phase above; scalable parallel systems

0.5 kVA–5 MW; VFI topology; tower, rack, modular and central systems

10 kW–5 MW system; module sizes commonly 10–250 kW; N+1/N+X

200 kVA–5 MVA per unit; flywheel/diesel rotary and motor-generator variants

1 kVA–5 MW; transformerless or transformer-based; single/three phase

5 kVA–6 MVA+; LV and MV systems; harsh-environment and DC plant variants

10 kW–5 MW per system; parallel plants tens of MW; lithium, VRLA and flywheel options

24/48/110/125/220 Vdc; about 1–1,000 kW; telecom, substation and industrial variants

100 kW–2 MW per unit; typically 10–60 seconds ride-through; parallel systems

5–1,000 kWh per cabinet/string group; VRLA, lithium-ion and Ni-Cd; matching DC bus required

1 kW–5 MW; 24–1,500 Vdc; 1/3 phase AC input; modular hot-swap variants

1 kVA–5 MW; 24–1,500 Vdc input; 120–690 Vac output; standalone or UPS module

16–6,300 A; 120–690 Vac; 1/3 phase; maintenance/automatic transfer configurations

16–6,300 A; wall, cabinet or switchboard integrated; make-before-break options