A replacement rate of two per cent means a property holding a thousand installed units is looking at twenty replacements a year, and the arrangement that decides how those twenty are supplied is agreed before the first order rather than after the first failure.
Charger spare parts supply: the five items
The rate, the unit, the route, the stock and the record.
Each is short enough to write into a purchase order and each changes the cost of ownership rather than the unit price. A programme that settles all five can process a failure in a day; one that settles none of them processes each failure as a negotiation.
The two per cent that shapes the order
The replacement rate is an assumption, and it should be named.
Two per cent a year is a common working figure for a mains charger in a commercial installation, and it is a planning number rather than a measurement. Writing it into the agreement does two things: it sets the spares quantity, and it gives both parties a figure to compare against the actual returns once the first year has passed.
Item one: what counts as a spare
A finished unit or a part, and the difference is commercial.
A finished unit is the simplest arrangement and the most expensive to hold, because the packaging and the accessories travel with it. A part-level arrangement suits products where the failure is concentrated in one component, such as the cable or the plug head, and it requires the specification to name the parts that may be supplied separately.
Item two: repair or replace
The decision follows the labour at the destination.
Replacing a unit takes minutes and returns the asset to service immediately; repairing one needs a bench, a technician and a stock of the failed part. Where the installed base sits in one facility with maintenance staff, repair is viable; where units are spread across sites, replacement is usually the only route that keeps the response time.
Item three: the route the replacements take
Four routes, and each carries a different cost.
A single unit shipped by courier, a batch shipped with the next production order, a consignment held at a local distributor, and an advance-replacement arrangement where the new unit ships before the failed one returns. The route decides the response time and the freight, and it is chosen per market rather than per product.
| Route | Response time | Freight | Best suited to |
|---|---|---|---|
| Courier, single unit | Days | Highest per unit | Occasional failures |
| With the next order | Weeks | Lowest | Programmes with regular shipments |
| Local consignment | Same day | A holding cost | Installations with a service desk |
| Advance replacement | Days, without waiting | Moderate | Units a user cannot be without |
Item four: who holds the stock
Holding cost sits with whoever can use the stock elsewhere.
A factory holding spares for one programme carries a cost it cannot spread; a distributor serving several programmes can. Where the stock sits with the brand, the quantity is set by the rate and the response time, and the storage cost is part of the cost of ownership rather than part of the unit price.
Item five: the record that makes it work
Three fields, and the third is what closes the loop.
The unit or asset it replaces, the batch code of the failed unit, and the mode it failed in. The batch code feeds the field analysis, and the mode is what tells the programme whether it is buying spares for a rate or paying for a design change.
How the arrangement changes the second order
It moves the spares out of the unit price.
Where spares are agreed as a separate line, the second order carries a defined quantity and a defined freight, and the failure rate is visible as a number rather than absorbed in a credit note. That visibility is what allows the rate assumption to be revised with evidence.
FAQ
Should spares be priced separately from the product?
Yes, because they answer a different question. Spares priced into the unit price hide the replacement rate inside the product cost, and the programme cannot see whether the cost it is carrying reflects a failure rate or an over-ordered stock level, which is exactly the number a second order needs to improve.
How many spares should a first order include?
The rate applied to the installed base over the response period, with a small floor for a low base. Where the base is under a few hundred units, the floor is usually set by the packaging minimum rather than by the rate, and that is worth knowing before the quantity is agreed.
Does a spare unit need its own documentation?
It carries the same marking and the same file as the product it replaces, and where it ships separately it needs the transport documentation and the label content for that market. A replacement unit without the label content is a compliance question on arrival rather than a service one.
What if the failure rate turns out higher than assumed?
The assumption is revised with the returns data, which is why the record matters more than the initial figure. A rate that has run at twice the assumption for two quarters is evidence for a design or packaging change rather than a reason to order more spares.
Next step
Send the installed base, the response time you need and the markets to Wecent Group through the contact page. The reply sets out the spares quantity, the route and the record that closes the loop. Related reading: charger manufacturing services, charger quality control and wholesale chargers. External references: BSI standards, IEC standards, UL solutions, EU WEEE Directive, EU RoHS Directive and ICC business solutions for trade.
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