Choosing a UPS manufacturer: what to verify before the purchase order.

What is the difference between OEM and ODM here?

OEM means the unit is built to your specification and carries your brand: your logo on the panel, your model naming, your manual, your packaging. The underlying platform is an existing design, which is why OEM is usually available on shorter lead times than a new design.

ODM means the design itself is adapted — a different output configuration, a different input window for a national grid, a different battery frame, an added communication port. It takes longer because the change has to be engineered, tested and documented, and the certification scope changes with it. Both are quoted per project; neither is a catalogue item with a fixed price.

• OEM: your brand, existing platform, panel and documentation changed
• ODM: design change, new testing, new document scope
• Both: the nameplate must match the certificate and the shipping documents
• Neither: a copied casing with a different label and no test record

How do you verify a UPS manufacturer before ordering?

Ask for four things and check that they agree with each other: the model list with real capacities and output power factors, the test record format used at the end of the line, the certificate scope with the model numbers it covers, and a reference project in a comparable grid condition. Inconsistency between these four is the most reliable warning sign.

A catalogue that quotes VA without watts, a certificate with no model numbers, or a reference project with no load figures is not proof of much. The reverse is also useful: a supplier who tells you which models they do not recommend for your site is usually the one with an engineering function.

What does a factory need to give you a usable quotation?

A quotation is only as good as its inputs. The list below is what changes the number materially; without it, a supplier can only quote a generic platform at a generic price, and the differences surface after the order.

Send the load list with running and starting currents, the required runtime, the site voltage and frequency, the country and the certification required there, and whether the site has a generator. Add the delivery port and the Incoterm you want to buy on. That is enough to produce a configuration, a document list and a delivery plan.

• Load list: kW and kVA, power factor, starting current for motors
• Required runtime in minutes or hours, and whether it must be expandable
• Site voltage, frequency, phase configuration and measured voltage range
• Country of installation and the certification required there
• Generator present or not, and the changeover arrangement
• Destination port, Incoterm, and whether OEM branding is required

A complete load list is reviewed by an engineer before a price is issued. An incomplete one produces a price that changes later, which costs both sides time.

Why are unit prices not published?

Because the same frame is sold in configurations that differ by more than the frame itself: battery chemistry and runtime, input window, output power factor, IP rating, communication options, documentation package and destination certification. A published number would describe one of those configurations and mislead on the rest.

The quotation states the configuration explicitly — model, battery, runtime, documents, packing and Incoterm — so the price can be compared line by line with another supplier instead of on the headline figure alone. The quotation process and its inputs are set out on the supplier page.