A unit price was agreed at a thousand pieces, and the second order came in higher at the same quantity. The explanation took a week to find: a component had reached end of life, the replacement cost more, and the test limits had been re-measured. Nothing in the price had been dishonest, and nothing in the purchase order had provided for the change.
Charger unit price: the levers that move it
Five levers move a unit price: volume thresholds, component choice, port and profile configuration, packaging and test time, and the fixed charges spread across the order.
Two of the five belong to the buyer’s specification, two belong to the factory’s process, and one is an arithmetic consequence of the quantity. Knowing which is which is what makes a negotiation a discussion about cost rather than about goodwill.
The levers also differ in how quickly they act: a packaging decision changes the price on the next order, while a component change may require an assessment before it can be priced.
Lever 1: volume thresholds
The price does not fall smoothly; it steps at the points where a cost changes.
Component packaging, the panel layout, the moulding batch and the packaging print run each have a threshold below which the step costs more than it produces. Between thresholds the unit price is nearly flat, and a supplier quoting a smooth curve is usually recovering fixed charges across the whole range. The practical question is which threshold the next order sits closest to, because a small increase can cross it and a small decrease can lose it.
Lever 2: component choice
The bill of materials is the largest line and the least visible to a buyer.
Switching devices, magnetic components, capacitors, the connector and the cable determine both the cost and the measured performance. Two chargers with the same headline wattage can differ substantially in this line, and the difference usually appears in efficiency, thermal behaviour or long-term reliability rather than in the specification sheet. Where a supplier proposes a substitution, the effect on the price and on the tested construction should be assessed together.
Lever 3: port and profile configuration
Every port and profile adds material and test positions.
A second port adds a connector, a control path and a sharing rule that has to be exercised. An adjustable profile range adds protocol behaviour and a broader test matrix. The unit price follows the material cost directly and the test time indirectly, which is why a multi-port configuration can be cheaper per watt and more expensive per unit at the same time.
Lever 4: packaging and test time
Two lines that buyers control more than they realise.
The packaging version decides the print setup and the material; the test plan decides how much time each unit spends at a station and how long the batch occupies an aging rack. A single language version on the first order and a test plan that measures what production can vary are the two most common ways to reduce cost without touching the product. Reducing the test plan itself trades a visible saving for an invisible risk.
Lever 5: the fixed charges spread across the order
Tooling, packaging setup, certification and documentation.
These are paid once, so their effect per unit is the fixed total divided by the quantity. This is the lever that makes two quotations at different quantities incomparable, and it is also the reason a first order looks expensive and a reorder does not. Reading the fixed charges separately is what turns a unit price into a cost structure.
| Lever | Who controls it | How quickly it acts | What it changes |
|---|---|---|---|
| Volume thresholds | The buyer’s forecast | Immediately at the next order | The spread of fixed charges |
| Component choice | The specification | After an assessment | Material cost and measured behaviour |
| Ports and profiles | The specification | Before tooling | Material and test matrix |
| Packaging and test time | The buyer’s packaging and quality plan | Next print and next build | Setup cost and station time |
| Fixed charges | Shared | Once per programme | The per-unit effect at a given quantity |
What does not move the unit price
Three things buyers often negotiate first.
The brand name on the label, the colour of the housing where the mould already exists, and the volume of correspondence. None of the three changes the material, the process or the fixed charges, and a supplier that concedes on them has taken the difference from somewhere else. Where a price reduction is offered, the useful question is which of the five levers it came from.
How to negotiate with the structure rather than the number
Four steps, and none of them requires a discount.
Ask for the five cost lines; identify which threshold the next order sits closest to; choose the packaging version that fits the first market; and fix the component list with the change procedure attached. Then compare the totals at the quantity you will actually order rather than at the quantity that makes the unit price look best. A reduction obtained by removing a control is repaid at the first claim.
FAQ
Why did the unit price rise on a repeat order?
Commonly a component substitution forced by supply, a quantity that fell below a threshold, or a fixed charge that had been absorbed into the first order. Asking for the five lines and the approved component list shows which of the three applies. A component substitution forced by supply, a quantity below a threshold or a fixed charge absorbed into the first order are the usual causes.
Should we negotiate the unit price or the packaging?
The packaging, because it is a fixed charge under the buyer’s control and it does not affect the product’s construction. A single language version on the first order is often worth more than a percentage on the unit price. The packaging is a fixed charge under the buyer’s control and it does not affect the construction, so a single language version is often worth more.
Is a lower unit price always available at a higher quantity?
Only at the thresholds where a cost actually changes. Between them, the difference is small, and a supplier quoting large steps without a structural reason is usually recovering fixed costs differently across the range. Only at the thresholds where a cost actually changes, and a supplier quoting large steps without a structural reason is recovering fixed costs differently across the range.
What should be written into the agreement about price changes?
The approved component list, the procedure for a substitution and the notification that goes with it. Without those three, a supply-driven change becomes a price change discovered on the invoice. Write in the approved component list, the procedure for a substitution and the notification that goes with it, because without those a supply-driven change becomes a price change discovered on the invoice.
Next step
Send the configuration, the packaging version and the forecast to Wecent Group through the contact page. The reply returns the five cost lines, names the threshold the next order sits closest to and states which levers are under the buyer’s control. Related reading: OEM and ODM charger manufacturing, charger manufacturing services and the factory floor. External references: ICC Incoterms rules, International Trade Centre Trade Map, IEC standards, EU CE marking rules, UL standards and certification and Intertek testing services.
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