· SH Energy editorial
Two systems with the same capacity can have very different five-year costs, depending on which parts are replaceable, how long they take to arrive, and whether anyone can identify them without a factory visit.
1. Know what actually fails
In storage systems, the battery is rarely the first failure. Communication boards, fans, displays, breakers, terminals and firmware behaviour account for a large share of early service calls. That matters because those parts are cheap to stock and fast to replace, while a battery module is expensive and slow.
Ask the supplier for a field-replaceable parts list with part numbers and lead times. If the answer is “send it back”, the product is not designed for your market.
2. Decide inventory from downtime cost
Every part you stock ties up capital and may become obsolete. The question is not “what is cheap” but “what happens to the customer while we wait”. A comms board that costs little but stops a system for three weeks can justify local stock; a spare inverter might not.
A workable first-year list is usually small: one or two of the most frequent boards, a fan kit, a display, and the terminal and breaker types used in the installation.
3. Request parts with evidence, not part numbers
A good request contains the model, serial number, firmware version, a nameplate photo and a board photo. A supplier who can identify the part from those is more useful than one who insists on a number you cannot find.
Keep the request format identical every time. It trains your own team and makes the supplier's answers comparable across cases.
4. Separate warranty from paid parts
Warranty covers a defect; a paid part covers a failure outside the terms. Mixing the two slows everything down. Define the evidence set for a warranty claim before the sale — serial number, fault code, installation photos, commissioning record — and keep paid-part pricing separate.
5. Plan the RMA path before you need it
Ask where a failed unit goes, who pays the freight, and what happens to the customer's system during the gap. If the answer is “back to China”, the real cost is the weeks without a working system, not the freight.
For systems with a local installer, a swap unit is often more valuable than a repair. That is a commercial decision you can plan for, not an emergency you discover.
6. Keep a case log from day one
Record every case with the same fields: site, model, serial, symptom, fault code, action, outcome. After twenty cases you will know which parts to stock, which firmware version to avoid, and which installation pattern causes repeat calls. That log is worth more than any generic spare-parts list.
Copy-ready spare parts request
Where this fits your market
After-sales scope and spare-parts coordination are described on the after-sales page. For market-specific import and installation context, see South Africa, Nigeria and Iraq.
Which spare part should an importer stock first?
Start from failure frequency and downtime cost, not from price. Communication boards, fans, displays and breakers are common first-year items; a battery module is expensive to stock and should follow the installed base rather than a guess.
How do I request a part without the exact part number?
Send the model, serial number, firmware version, a photo of the nameplate and a photo of the board. A supplier who can identify the part from those is more useful than one who needs a part number you do not have.
Is local stock always cheaper than shipping from China?
No. Local stock carries capital, storage and obsolescence cost. It is worth holding when downtime cost is high or the shipping lead time is longer than the customer will accept.
What should the warranty process require?
A defined evidence set: serial number, fault code, installation photos and a commissioning record. Defining it before the sale prevents disputes later.
Discuss an after-sales case
Send the model, serial number, fault code and photos to jimmy@sunhongenergy.com, or message the desk on WhatsApp. Related reading: the spare-parts request checklist and the RMA evidence checklist.
Scope
This guide describes service planning practice. Parts availability, warranty terms and repair locations are set by the manufacturer or supplier for the exact model.