Chile approved Elena 2 in Antofagasta on 30 October 2026: 467.5 MW of solar with a 3,010 MWh battery. Its BMS needs precision thin film resistor dividers. In the Walsin Technology (Walsin) export, anti-sulfur thin film exists only in 1206 and 2010, and the 1206 part stops at 50.5 ohm.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for a design or sourcing engineer at a Chilean solar, battery storage or power-conversion supplier who needs an accurate, sulfur-tolerant resistor for cell-voltage or string-voltage measurement. On 11 November 2026 we re-read all 20 Walsin thin film export files (93,914 rows, 93,914 distinct part numbers), the High Precision Anti-Sulfuration thick film rows of the chip resistor export, and our stock list as at 23 September 2026. Every part number is real. The project facts are Reporte Minero’s, fetched today.
What did Chile approve at Elena 2 on 30 October 2026?
A large solar plant with seven hours of storage. According to Reporte Minero on 3 November 2026, Antofagasta’s Environmental Evaluation Commission approved Grenergy’s Elena 2 project on 30 October 2026: 566.58 MWp installed and 467.5 MW nominal solar, with a 430 MW, 3,010 MWh lithium-ion battery, an investment of 577 million US dollars.
The report put construction in the second half of 2027 and commercial operation in the second half of 2029. These are the publication’s figures, not ours, and an environmental approval is not a construction start. We have no relationship with Grenergy or any contractor and say nothing about what anyone buys. Our point is narrower: a 3,010 MWh battery is many thousands of cells, and every cell voltage is read through a resistor network whose accuracy and drift the BMS designer must choose.
Why does a precision thin film resistor matter in a solar-plus-storage plant?
Because cell balancing and state-of-charge depend on millivolt accuracy across years of heat. A divider built from 0.1 percent, 25 ppm per °C parts keeps its ratio far better than 1 percent, 100 ppm thick film, and Walsin’s thin film export offers 93,914 part numbers in three series: 58,314 WF precision, 20,520 MF tantalum nitride and 15,080 SF anti-sulfuration.
Northern Chile adds a second concern. Silver-bearing resistor electrodes can sulfurate in sulfur-bearing air, which is why buyers near mining and smelting operations ask for anti-sulfur parts. Our post on thin film versus thick film chip resistors explains the accuracy trade, and our post on anti-sulfuration resistors, SF thin film and SA arrays explains what we hold and do not hold about the sulfur test. We hold no Walsin datasheet for any thin film series.
Where does Walsin’s anti-sulfur thin film range actually sit?
Almost entirely in 2010. We counted the 15,080 SF anti-sulfuration thin film part numbers by case: 14,810 are 2010 and 270 are 1206, and the 1206 parts cover only 29 resistance values, from 1.0 to 1.69 ohm plus 10.5, 20.5, 30.5 and 50.5 ohm.
| SF thin film case | Part numbers | Resistance values | TCR grades in the export |
|---|---|---|---|
| 0402, 0603, 0805 | 0 | none | none |
| 1206 | 270 | 29, from 1.0 to 50.5 ohm | 10, 25 and 50 ppm per °C |
| 2010 | 14,810 | 4.7 ohm to 3 megohm | 25 and 50 ppm per °C |
We have not seen the 1206 value gap counted anywhere. It means a BMS designer who wants an anti-sulfur thin film divider at 10 kilohm or 100 kilohm has one case to draw, 2010, at up to 3/4 W. Two more export files that sound relevant, Anti_Sulfuration_AEC_Q200_Thin_Film_Chip_Resistor_SF.xlsx and Thin_Film_Professional_AEC_Q200_Chip_Resistor_WF_Q_S.xlsx, return zero rows, so no AEC-Q200 thin film part is visible in the export at all.
Which Walsin parts answer a 100 kilohm, 0.1 percent anti-sulfur brief, and what differs?
Three thin film parts, all in 2010, and two thick film parts in small cases. We filtered for 100 kilohm at plus or minus 0.1 percent: the SF thin film series returns 3 part numbers, all 2010; the High Precision Anti-Sulfuration thick film series returns parts from 0402 to 1210 at up to 100 ppm per °C; none is on our shelf.
The last column is for your incumbent.
| Walsin part | Series as exported | Case, power | TCR, ppm per °C | Match / mismatch with a 100 kilohm, 0.1%, 25 ppm, anti-sulfur, thin film brief | Your incumbent |
|---|---|---|---|---|---|
SF20U1003BTL |
Anti-Sulfuration Thin Film, SF | 2010, 1/2 W | up to 25 | Match on every exported field | |
SF20R1003BTL |
Anti-Sulfuration Thin Film, SF | 2010, 3/4 W | up to 25 | Match; higher power than the U part | |
SF20T1003BTL |
Anti-Sulfuration Thin Film, SF | 2010, 1/2 W | up to 50 | Mismatch: TCR up to 50 | |
SF06H1003BTL |
High Precision Anti-Sulfuration (thick film) | 0603, 1/10 W | up to 100 | Mismatch: thick film, TCR up to 100 | |
SF12H1003BTL |
High Precision Anti-Sulfuration (thick film) | 1206, 1/4 W | up to 100 | Mismatch: thick film, TCR up to 100 | |
MF12R1003BTL |
Tantalum nitride Thin Film, MF | 1206, 2/5 W | up to 25 | Mismatch: no anti-sulfur label in the series name |
A match in the table is a match on export fields, no more. Confirm against both datasheets and qualify in your own circuit. The MF tantalum nitride row is there because tantalum nitride is often chosen for harsh air, but its series name does not say anti-sulfur, so we do not count it as one.
Why does the SF prefix not tell you thin film from thick film?
Because Walsin uses it for both. We read the prefixes: all 15,080 thin film anti-sulfuration parts begin SF12 or SF20, and all 5,710 High Precision Anti-Sulfuration thick film parts also begin SF, as in SF06H1003BTL.
So SF20U1003BTL is thin film at up to 25 ppm per °C and SF06H1003BTL is thick film at up to 100, and a BOM filter on “SF” returns both. The thick film parts come only at plus or minus 0.1 and 0.5 percent, and 10 of the 5,710 rows print TCR as a range from minus 200 to plus 400 ppm per °C. Read the series name and the TCR field for every line. Our post on high precision thick film versus thin film precision sets the two side by side.
What does the Hong Kong shelf hold for precision resistors?
No thin film at all. Our stock list as at 23 September 2026 holds 1,125 part numbers; we counted 0 of the 93,914 thin film part numbers and 0 of the 5,710 High Precision Anti-Sulfuration thick film parts on it.
The ready stock list is a dated snapshot, never live-synced, and it counts part numbers, not pieces. For a precision thin film resistor, ask for a to-order enquiry by exact part number; we make no lead-time or stock promise. We hold no office, entity or stock in Chile; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation. We give no customs or legal advice; confirm with your compliance team. The thin film range lists the families.
How can Venatech help a Chilean solar and storage 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; paste up to 500 part numbers or drop an Excel or CSV file and every field comes back marked match or mismatch. Load a whole BOM for a check, and see the ready-stock list, a Hong Kong snapshot dated 23 September 2026.
Worked example from our own export: the 100 kilohm, 0.1 percent anti-sulfur brief returned 3 thin film parts, all 2010, 1 exact match at 25 ppm per °C, and none on the shelf. 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. Qualification stays with you.
The short version
Reporte Minero reported on 3 November 2026 that Elena 2, with a 3,010 MWh battery, was approved in Antofagasta. For the precision thin film resistor in its BMS dividers, Walsin’s anti-sulfur thin film sits in 2010, the 1206 parts stop at 50.5 ohm, and the SF prefix also covers thick film, so check the series and TCR on every line.
Send us your divider lines with value, tolerance, TCR and case, and we will return the Walsin parts with every difference stated. Is your anti-sulfur divider drawn in a case where an anti-sulfur thin film part exists?
Sources
Fetched 11 November 2026.
- Reporte Minero, Grenergy obtiene aprobación ambiental para el parque fotovoltaico Elena 2 en Antofagasta, 3 November 2026: https://www.reporteminero.cl/noticia/noticias/2026/11/grenergy-aprobacion-parque-fotovoltaico-elena-2-antofagasta-577-millones
- Walsin thin film exports (20 files, 93,914 rows), the High Precision Anti-Sulfuration rows of the chip resistor export, and the Venatech ready-stock workbook as at 23 September 2026, re-measured 11 November 2026 (internal files).
Related reading
- Thin film versus thick film chip resistors
- High precision thick film versus thin film precision
- Anti-sulfuration resistors: SF thin film and SA arrays
- Free cross-reference tool (VenaMatch)
- Ready stock, Hong Kong snapshot dated 23 September 2026
Last reviewed 11 Nov 2026.
Frequently asked questions
What did Chile approve at Elena 2?
Reporte Minero reported on 3 November 2026 that Antofagasta’s Environmental Evaluation Commission approved Grenergy’s Elena 2 on 30 October 2026: 467.5 MW nominal solar and a 430 MW, 3,010 MWh battery, with operation expected in the second half of 2029.
In which case sizes does Walsin offer anti-sulfur thin film resistors?
Only 1206 and 2010 in the export: 270 part numbers in 1206 and 14,810 in 2010. The 1206 parts cover 29 values from 1.0 to 50.5 ohm, so a 100 kilohm anti-sulfur thin film part is 2010 only.
Which Walsin part matches a 100 kilohm, 0.1 percent, 25 ppm anti-sulfur thin film brief?
SF20U1003BTL matches every exported field in 2010 at 1/2 W; SF20R1003BTL matches at 3/4 W. SF20T1003BTL is the same value at up to 50 ppm per degree. Confirm against both datasheets and qualify in your own circuit.
Is every Walsin SF part number a thin film resistor?
No. The 5,710 High Precision Anti-Sulfuration thick film parts also start with SF, for example SF06H1003BTL at up to 100 ppm per degree. Read the series name and the TCR field before you treat an SF part as thin film.
Does Venatech stock thin film resistors in Hong Kong?
Not in the snapshot dated 23 September 2026, which holds none of the 93,914 thin film part numbers. Ask for a to-order enquiry through the site; we make no lead-time or stock promise.
Do you have an office or stock in Chile?
No. We hold no office, entity or stock in Chile; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen. We hold no ISO 9001 or IATF 16949 certificate and give no customs or legal advice. Confirm with your compliance team.