Battery storage electronics for Spain include high-voltage snubber and filter capacitors, and a 10 nanofarad X7R brief at 2 kV or more returns 21 Walsin Technology (Walsin) part numbers, 1 of them a safety part whose 5000 V is an impulse rating, none on our shelf. MITECO announced Spain’s capacity market rules on 16 September 2026.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for a design or sourcing engineer at a Spanish maker or integrator of battery storage converters or power cabinets who is crossing a 10 nanofarad high-voltage capacitor. The market statement names its source and the day we fetched it, 10 November 2026. The counts come from the Walsin MLCC export (24,026 rows, 23,601 distinct part numbers) and our stock list as at 23 September 2026. We do not know your topology, and the 2 kV rung is the one we measured. Every part number is real.
What did Spain announce about its capacity market in September 2026?
It announced rules that let storage compete for firm capacity. According to ESS News on 17 September 2026, Spain’s ministry MITECO announced on 16 September 2026 a capacity market with auctions that award firm capacity in MW on a pay-as-bid basis, with service periods of one year for existing installations and up to 15 years for new investment.
The article said only renewable generation, storage and demand projects can receive new-investment contracts, and that the ministerial order was still to appear in the official gazette, so dates were not stated. These are the publication’s reading, not ours, and the rules were not yet in force when we fetched it. We have no relationship with any Spanish developer, and we say nothing about what any of them buys.
Which Walsin X7R 10 nanofarad capacitors are rated 2 kV or more, and what differs?
Twenty-one part numbers, and one of them is not what the voltage suggests. We filtered the Walsin MLCC export for X7R, 10 nanofarad, 2000 V or more and found 21 distinct part numbers: 20 in the Middle-to-High-Voltage, Big Sizes, Soft Termination SH and Automotive ST series, and 1 safety part, S242B103K502, whose Rated Voltage cell reads 5000 V.
The last column is for your incumbent.
| Walsin part | Description | On shelf 23 Sep 2026 | Match / mismatch with a 10 nF, 2 kV, 1812 brief | Your incumbent |
|---|---|---|---|---|
1812B103K202 |
Middle-to-High-Voltage, X7R, 1812, 10 nF, plus or minus 10 percent, 2000 V, 2.50 plus or minus 0.30 mm | No | Match on size, dielectric, value, tolerance and voltage | |
1812B103J202 |
Middle-to-High-Voltage, X7R, 1812, 10 nF, plus or minus 5 percent, 2000 V | No | Mismatch: tolerance is plus or minus 5 percent, tighter | |
SH43B103K202 |
Soft Termination (SH), X7R, 1812, 10 nF, plus or minus 10 percent, 2000 V | No | Match on the electrical fields; mismatch: termination is soft (Ag-poly) | |
1812B103K352 |
Middle-to-High-Voltage, X7R, 1812, 10 nF, plus or minus 10 percent, 3500 V | No | Match on size and value; mismatch: voltage is 3500 V | |
1808B103K202 |
Middle-to-High-Voltage, X7R, 1808, 10 nF, plus or minus 10 percent, 2000 V, 2.00 mm | No | Match on the electrical fields; mismatch: case is 1808, smaller | |
ST55B103K302 |
Automotive Soft Termination (ST), X7R, 2220, 10 nF, plus or minus 10 percent, 3000 V | No | Mismatch: case 2220, voltage 3000 V and automotive series | |
S242B103K502 |
Safety S2, X7R, 1808, 10 nF, plus or minus 10 percent, export reads 5000 V | No | Mismatch: the 5000 V is an impulse voltage, not a working voltage |
A match in the table is a match on export fields, no more. Confirm against both datasheets and qualify in your own circuit. Our posts on MLCC DC bias and voltage derating and soft termination MLCC explain what the voltage column does not tell you.
Why does a bare voltage filter pull in safety parts?
Because the S2 series stores its impulse voltage in the Rated Voltage field. We counted 84 S2 safety part numbers among the X7R parts at 1000 V or more in the export, all reading 5000 V, so a plain 2 kV filter returns 500 part numbers of which 84, 17 percent, are safety parts whose working voltage is far lower.
The S2 approval sheet we hold labels that figure as an impulse voltage and gives the working rating separately, X1 310 Vac and Y2 250 Vac with 1500 Vdc on all models. A storage engineer who copies 5000 V into a DC-link or snubber spec would be reading the wrong number. Exclude the S2 series by name, or read the datasheet, before you trust the column. We counted 416 non-S2 X7R part numbers at 2000 V or more.
What does the Hong Kong shelf hold at high voltage?
Plenty at 1 kV, nothing in this brief. Our stock list as at 23 September 2026 holds 35 of the 820 non-S2 X7R part numbers rated 1000 V or more and 13 of the 416 rated 2000 V or more, but none at 10 nanofarad and 2000 V or more; at 10 nanofarad and 1000 V or more it holds 1 of 50.
The ready stock list is a dated snapshot, never live-synced, and it counts part numbers, not pieces. The MLCC range lists the families. If your value and rung are not stocked, ask for a to-order enquiry through the site.
What will we not tell you about Spanish storage projects?
Anything about your converter, your insulation coordination or your tender. We hold 28 Walsin datasheets, 26 of them MLCC, and none names a battery storage product, so every count here is catalogue coverage, not suitability.
We make no claim that any part suits a DC link, a snubber or a creepage requirement. We hold no ISO 9001 or IATF 16949 certificate and make no qualification claim of our own. We hold no office, entity or stock in Spain; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation. We give no legal, customs or regulatory advice; confirm with your compliance team. Qualification stays with you.
How can Venatech help a Spanish storage-converter buyer?
How Venatech helps starts with a free paste box. The cross-reference tool, VenaMatch, decodes 18 manufacturers’ part numbers and covers 800,000+ crossable parts; it accepts up to 500 part numbers or an Excel or CSV file and marks every field match or mismatch. Load a whole BOM for a check. The ready-stock list is a Hong Kong snapshot dated 23 September 2026.
Worked example from our own export: the 10 nanofarad, X7R, 2 kV brief returned 21 part numbers, 1 exact match on size, none on the shelf, and one safety part to exclude. Venatech Limited is authorised for Walsin only; Stackpole and Viking are lines we supply. We serve from Hong Kong, welcome small lots, and you request a quote through the site.
The short version
MITECO announced Spain’s capacity market on 16 September 2026, with service periods of up to 15 years for new investment. For the capacitor line, the Walsin 10 nanofarad X7R brief at 2 kV or more returns 21 part numbers, 1 a safety part with an impulse rating, and none are on our shelf.
Send us one high-voltage capacitor line from your converter BOM, with the value, voltage rung and case you accept, and we will return the Walsin parts with every difference stated. When you filter on rated voltage, do you know which series store an impulse figure there?
Sources
Fetched 10 November 2026. – ESS News, Spain launches capacity market via auctions, with key rules that support energy storage, 17 September 2026: https://www.ess-news.com/2026/09/17/spain-launches-capacity-market-via-auctions-with-key-rules-that-support-energy-storage/ – Walsin MLCC and chip resistor exports and the Venatech ready-stock workbook (.xlsx) as at 23 September 2026, re-measured 10 November 2026 (internal files).
Related reading
- Soft termination MLCC: SH, SG, ST and VT
- X1/Y1 versus X1/Y2 safety capacitors
- How to cross-reference an MLCC, field by field
- Free cross-reference tool (VenaMatch)
- Ready stock, Hong Kong snapshot dated 23 September 2026
Last reviewed 10 Nov 2026.
Frequently asked questions
What did MITECO announce on 16 September 2026?
ESS News reported on 17 September 2026 that MITECO announced a capacity market with pay-as-bid auctions for firm capacity in MW, service periods of up to 15 years for new investment, and eligibility for new projects limited to renewable generation, storage and demand. The order was still to be published.
How many Walsin 10 nanofarad X7R parts are rated 2 kV or more?
Twenty-one distinct part numbers in the export, 20 of them in the Middle-to-High-Voltage, Big Sizes, SH and ST series plus 1 S2 safety part. Cases run from 1210 to 2225, and voltages from 2000 V to 3500 V outside the S2 part.
Why does S242B103K502 show 5000 V?
The S2 series stores its impulse voltage in the Rated Voltage field. The working rating is on the approval sheet, X1 310 Vac and Y2 250 Vac with 1500 Vdc. Do not use the export figure as a DC working voltage.
Which 10 nanofarad, 2 kV part matches a 1812 brief?
1812B103K202 matches on every export field. It is not on our shelf. SH43B103K202 matches the electrical fields but has a soft termination. Confirm the datasheet and qualify in your own circuit.
What high-voltage X7R is on the Hong Kong shelf?
As at 23 September 2026, 35 non-S2 X7R part numbers at 1000 V or more and 13 at 2000 V or more, none at 10 nanofarad and 2000 V or more. The snapshot is dated, not live, so ask us through the site.
Do you hold stock or an office in Spain?
No. We hold no office, entity or stock in Spain; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen. We hold no ISO 9001 or IATF 16949 certificate and give no legal or customs advice. Confirm with your compliance team.