--- title: "Waaree WS-350 vs Waaree WSM-390 - Solar Panel Comparison | ComparePV" description: "Compare Waaree WS-350 vs Waaree WSM-390 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/waaree-ws-350/waaree-wsm-390" image: "https://comparepv.com/og/compare/panels/waaree-ws-350/waaree-wsm-390.png" updated: 2026-09-11 --- # Waaree WS-350 vs Waaree WSM-390 WSM-390 leads on the differences that matter The largest is module efficiency: 2.01 pp more efficient. 8 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Waaree WS-350](https://comparepv.com/panel/waaree-ws-350) | [Waaree WSM-390](https://comparepv.com/panel/waaree-wsm-390) | | Manufacturer | Waaree | Waaree | | Power | 350 Wp | 390 Wp | | Efficiency | 17.57 % | 19.58 % | | Technology | | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | WS-350 | WSM-390 | Difference | | --- | --- | --- | --- | | Module efficiency | 17.57 % | 19.58 % | +2.01 pp for WSM-390 | | Rated power | 350 Wp | 390 Wp | +40 W for WSM-390 | | Power density | 175.8 Wp/m² | 195.9 Wp/m² | +20.1 Wp/m² for WSM-390 | | Weight per kWp | 61.4 kg/kWp | 55.1 kg/kWp | -6.3 kg/kWp for WSM-390 | | Temperature coefficient | -0.386 %/°C | -0.370 %/°C | +0.016 %/°C for WSM-390 | | Open-circuit voltage | 47.10 V | 48.85 V | 1.75 V apart | | Short-circuit current | 9.45 A | 10.03 A | 0.58 A apart | | Cell type | Polycrystalline | Monocrystalline | Polycrystalline vs Monocrystalline | | Current at max power | 9.00 A | 9.73 A | 0.73 A apart | | Voltage at max power | 38.90 V | 40.10 V | 1.20 V apart | ## Every compared parameter | Parameter | WS-350 | WSM-390 | | --- | --- | --- | | Rated power | 350 Wp | 390 Wp | | Module efficiency | 17.57 % | 19.58 % | | Power density | 175.8 Wp/m² | 195.9 Wp/m² | | Open-circuit voltage | 47.10 V | 48.85 V | | Voltage at max power | 38.90 V | 40.10 V | | Short-circuit current | 9.45 A | 10.03 A | | Current at max power | 9.00 A | 9.73 A | | Temperature coefficient | -0.386 %/°C | -0.370 %/°C | | Dimensions | 1985x1003x35 mm | 1985x1003x35 mm | | Module area | 1.991 m² | 1.991 m² | | Weight | 21.5 kg | 21.5 kg | | Weight per kWp | 61.4 kg/kWp | 55.1 kg/kWp | | Product warranty | 10 yrs | 10 yrs | | Performance warranty | 25 yrs | 25 yrs | | Annual degradation | 0.70 %/yr | 0.70 %/yr | | Cell technology | - | PERC | | Cell type | Polycrystalline | Monocrystalline | | Cell count | 72 | 72 | | Bifacial | No | No | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year - **Cumulative output, WS-350:** 11,006 kWh - **Cumulative output, WSM-390:** 12,194 kWh - **Gap:** 1,188 kWh ## Output when hot | Condition | Cell temperature | WS-350 | WSM-390 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 350 W | 390 W | 100.0% of rated power | | Cool, bright day | 40 °C | 330 W | 368 W | 94.2% of rated power | | Typical summer roof | 55 °C | 309 W | 347 W | 88.4% of rated power | | Hot roof | 70 °C | 289 W | 325 W | 82.6% of rated power | ## Against the whole database | Measure | WS-350 | WSM-390 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #13,435 | #12,711 | 14,129 | WSM-390 leads by 724 places | | Power density | #13,416 | #12,682 | 14,129 | WSM-390 leads by 734 places | | Heat behaviour | #13,565 | #13,161 | 14,129 | WSM-390 leads by 404 places | | Weight | #12,739 | #9,637 | 14,129 | WSM-390 leads by 3,102 places | | Warranty | #9,912 | #9,912 | 14,129 | Tied - the same position in the database | | Overall | #13,359 | #12,732 | 14,129 | WSM-390 leads by 627 places | ## Questions ### Which panel is better: Waaree WS-350 or Waaree WSM-390? According to our database: **Waaree WSM-390** has higher module efficiency (**19.58%** vs **17.57%**); **Waaree WSM-390** tolerates heat better (temp coeff **-0.370%/°C** vs **-0.386%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Waaree WS-350 and Waaree WSM-390? **Waaree WS-350** has a module efficiency of **17.57%**, while **Waaree WSM-390** is **19.58%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Waaree WS-350 use vs Waaree WSM-390? **Waaree WS-350** uses Polycrystalline cells; **Waaree WSM-390** uses **PERC**. Modern **n-type** technologies (**TOPCon**, **HJT**, BC) typically deliver higher efficiency and lower degradation compared to older **PERC** (p-type) cells. ### What is the warranty on Waaree WS-350 and Waaree WSM-390? **Waaree WS-350** has a **25 years** power warranty; **Waaree WSM-390** has a **25 years** power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80**-87%**). Product (materials) warranties are usually shorter. ## Related comparisons - [Waaree WS-350 vs Waaree WSM-395](https://comparepv.com/compare/waaree-ws-350/waaree-wsm-395) - 10 differences, the largest is module efficiency - [Waaree WS-350 vs Waaree WSM-385](https://comparepv.com/compare/waaree-ws-350/waaree-wsm-385) - 10 differences, the largest is module efficiency - [Waaree WS-350 vs Waaree WSM-380](https://comparepv.com/compare/waaree-ws-350/waaree-wsm-380) - 8 differences, the largest is module efficiency - [Waaree WS-350 vs Waaree WS-345](https://comparepv.com/compare/waaree-ws-350/waaree-ws-345) - One difference: module efficiency - [Waaree WS-350 vs Waaree WS-340](https://comparepv.com/compare/waaree-ws-350/waaree-ws-340) - 3 differences, the largest is module efficiency - [Waaree WS-350 vs Waaree WS-335](https://comparepv.com/compare/waaree-ws-350/waaree-ws-335) - 4 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/waaree-ws-350/waaree-wsm-390 Not in this file, on the page: the thirty-year yield curve year by year at a cell temperature you pick and a written summary generated on request.