Battery storage electronics for South Korea are being specified under a 1.18 GW, six-hour, 15-year tender that asks bidders to disclose key-component makers and origin. For a 33 ohm, 1 percent, 2512 balancing resistor, Walsin Technology (Walsin) lists 6 part numbers and our shelf holds none; 1 of 22,154 Walsin 2512 parts is stocked.
Venatech Limited, an authorised Walsin distributor in Hong Kong, holds the Walsin chip resistor exports (234,815 rows across 137 files), 28 Walsin datasheets of 451 pages, and a stock list dated 23 September 2026. This post is for a battery-pack, BMS or power-conversion engineer at a Korean storage supplier who needs a power resistor cross and a clear view of what the paperwork covers. The news statements name their source and the day we fetched it, 23 October 2026. The design numbers are ours and rest on an assumption we state.
What does Korea’s 2026 six-hour storage tender ask of a bidder?
The Korea Power Exchange has opened its 2026 central contract market tender for 1.18 GW of six-hour battery storage on 15-year contracts, with proposals accepted from 6 October to 4 November 2026 and awards scheduled for November 2026. That is the account in pv magazine dated 23 September 2026, based on ESS News reporting.
The same article gives the shape of the bid. About 1.1 GW is on the mainland and 80 MW on Jeju, run as separate processes, and projects must be complete by February 2029. The mainland project asks for grid-forming capability and at least 383 cycles a year. Half the score is price and half is non-price criteria; fire and equipment safety carries 25 points, 11 of them for the battery system’s inherent fire safety. Bidders must disclose manufacturers and production origin for key components, which the article says is not a mandate for domestic supply. Lithium-ion and other technologies are allowed, but one project cannot mix them.
We draw one conclusion, and it is ours. A bidder who must name makers and origin for key parts will ask its board suppliers the same questions, and a resistor on a battery management board is rarely a key component but is a line on the list. We have no relationship with the Korea Power Exchange or any bidder.
Which Walsin 33 ohm 2512 parts cross a cell-balancing brief, and what differs?
Six Walsin part numbers match a brief of 2512, 33 ohm, plus or minus 1 percent, 1 W and a temperature coefficient of 100 ppm or better, they sit in four series, and none is on our shelf as at 23 September 2026. Our post on chip resistor power by case size covers the size and watt pairing.
The brief is an assumption of ours, shown so you can swap in yours. A 3.65 volt cell bled through 33 ohm dissipates about 0.40 W (3.65 squared divided by 33), roughly 40 percent of a 1 W rating, at about 0.11 A. That leaves little margin at cabinet temperature, so read the power-derating figure for your size before you rely on it.
| Walsin part | Series | Size, value, tolerance, power | On shelf 23 Sep 2026 | Match / mismatch with the brief | Your incumbent |
|---|---|---|---|---|---|
WR25X33R0FTL |
Thick Film General Purpose | 2512, 33 ohm, 1%, 1 W | No | Match on size, value, tolerance, power and TCR | |
WR25X33R0FTR |
General Purpose LF 100ppm | 2512, 33 ohm, 1%, 1 W | No | Mismatch: different series; last letter differs | |
WR25X33R0FTLJ |
General Purpose (Automotive) | 2512, 33 ohm, 1%, 1 W | No | Mismatch: automotive series, extra trailing letter | |
MR25X33R0FTL |
General Purpose (Automotive) | 2512, 33 ohm, 1%, 1 W | No | Mismatch: MR prefix, automotive series | |
SR25X33R0FTL |
High Grade Anti-Sulfuration (Automotive) | 2512, 33 ohm, 1%, 1 W | No | Mismatch: anti-sulfuration series | |
SR25X33R0FTLW |
High Grade Anti-Sulfuration (Automotive) | 2512, 33 ohm, 1%, 1 W | No | Mismatch: anti-sulfuration series, extra trailing letter | |
WR25X3301FTL |
Thick Film General Purpose | 2512, 3,300 ohm, 1%, 1 W | Yes | Mismatch: resistance is 3.3 kilohm |
We counted these from the export by filtering size 2512, resistance 33.0 ohm, tolerance plus or minus 1 percent and rated power 1 W. All six carry a temperature coefficient of 100 ppm or better, so the series and the trailing letters are what separate them. We do not know what the trailing letters W and J select, because the export has no column for them. Confirm against both datasheets and qualify in your own circuit.
How much of Walsin’s WR resistor range does the datasheet we hold cover?
The WR General Purpose datasheet we hold covers four case sizes (WR12, WR08, WR06 and WR04, which are 1206, 0805, 0603 and 0402), and those four account for 19,660 of the 45,315 WR part numbers in the export, 43.4 percent. The other 25,655 WR parts, including all 3,187 in the 2512 size, have no WR datasheet on file with us.
We opened the PDF and read it. The PDF’s metadata title names three sizes, its text names four, and its derating figure is captioned for those four. Searching the text for the 2512 code and the WR25 prefix returned 0 hits. The figure is the page that tells you how much of the rating survives at temperature, and it is the page a battery cabinet designer needs most. The export itself holds 22,154 distinct 2512 part numbers across every chip resistor series, and 7,653 of them are rated 1 W at plus or minus 1 percent, across 967 resistance values.
So for the part in the table above, we can cross the fields, but we cannot show you a Walsin derating curve for it from a document we hold. A datasheet covering the larger sizes is not among the documents we hold, and it is on our request list. Do not infer a 2512 curve from the 1206 one.
What does a Hong Kong shelf hold for a Korean battery storage line?
One 2512 resistor part number out of 22,154 in the export is on our shelf: WR25X3301FTL, 3.3 kilohm, and none of the six 33 ohm parts. Across the chip resistor lines, 183 distinct part numbers on our stock list as at 23 September 2026 match the export, 170 of them General Purpose and 78 of them 0603.
Our resistor shelf is mostly small case sizes: 0603 and 0402 account for 133 of those 183 part numbers, and 2512 for 1. If your board needs 2512 at 33 ohm we quote it against the export through a request, from Hong Kong, in small lots, and we promise no lead time here. The ready stock list is a dated snapshot, never live-synced, and our post on Walsin stock in Hong Kong explains how to read it. The chip resistor range lists the families.
On origin: a country of origin is not in the documents we hold, and we state none. We name the manufacturer, Walsin, and we hold lot and date-code traceability, a certificate of conformity per shipment on request and original sealed Walsin packaging. We hold no office, entity or stock in South Korea, and we give no customs or compliance advice; confirm with your compliance team.
How Venatech helps
Paste your incumbent into the free cross-reference tool, which decodes 18 manufacturers’ part numbers across 800,000+ crossable parts, and read the Walsin candidates with each field marked match or mismatch. Load a whole BOM, up to 500 part numbers or an Excel or CSV file, to run every line at once. The ready-stock list is a Hong Kong snapshot dated 23 September 2026.
Worked example from our own export: the 2512, 33 ohm, 1 percent, 1 W filter returned 6 part numbers in four series, and our shelf covers none of them. Walsin is the only line we are authorised for; Stackpole and Viking are lines we supply. We serve from Hong Kong in small lots, and a quote is requested through the site. We send the Walsin datasheets we hold, 28 files of 451 pages, on request.
The short version
For a Korean storage supplier, the tender sets the pace and the bill of materials sets the detail: 6 Walsin parts match a 33 ohm 2512 balancing brief, 0 are on our shelf, and the WR datasheet we hold covers four sizes and not the 2512 one.
Send us the balancing resistor from your BMS and we will return the Walsin candidates with the differences stated and the datasheet gap named. If your bid must name a maker for every key part, which resistor on your board would you call key?
Sources
Fetched on 23 October 2026, the one external statement set in this post comes from this article.
- pv magazine, “South Korea tenders 6.6 GWh of six-hour storage under 15-year contracts”, 23 September 2026: http://www.pv-magazine.com/2026/09/23/south-korea-tenders-6-6-gwh-of-six-hour-storage-under-15-year-contracts/
Frequently asked questions
What is the Korea Power Exchange 2026 ESS central contract market tender?
According to pv magazine on 23 September 2026, it is a 1.18 GW tender for six-hour battery storage on 15-year contracts, with proposals accepted from 6 October to 4 November 2026 and awards scheduled for November 2026. Confirm every detail against the official tender documents.
What must bidders disclose about components?
The same article says bidders must disclose manufacturers and production origin for key components, and that this is not a mandated domestic-supply requirement. What counts as a key component is for the tender documents and your compliance team to say.
Which Walsin part crosses a 2512, 33 ohm, 1 percent, 1 W brief?
WR25X33R0FTL matches on size, value, tolerance, power and temperature coefficient, and it is not on our shelf as at 23 September 2026. Five others share the fields but sit in automotive, anti-sulfuration or LF 100ppm series. Confirm against both datasheets and qualify in your own circuit.
Does the WR datasheet you hold cover 2512 resistors?
No. The sheet we hold covers WR12, WR08, WR06 and WR04, which are 1206, 0805, 0603 and 0402. Those four sizes are 19,660 of 45,315 WR part numbers, 43.4 percent, and the 3,187 WR25 parts have no WR datasheet on file with us.
Which 2512 resistor is on your shelf?
One: WR25X3301FTL, 3.3 kilohm, plus or minus 1 percent, 1 W, as at 23 September 2026. It is 1 of 22,154 distinct 2512 part numbers in the Walsin export. Check the ready stock list for the dated snapshot; it is never live-synced.
Do you hold stock or an office in South Korea?
No. We hold no office, entity or stock in South Korea; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen. We state no country of origin and give no customs or compliance advice. Confirm with your compliance team.