See specifications, prices, warranty info and reviews for the SPR-E20-327, a 327 Monocrystalline solar panel from SunPower. Model # SPR-E20-327-COM. However, retails systems seem to be available with a tier-one string inverter for around $3.50 per watt which is around $0.40 cents per wat more when compared to other leading brands. Solar panels in the X-Series have efficiency ratings ranging from 20.3% to 22.2%, making them some of the most efficient solar panels on the market. Itâs not clear whether LG and SunPower manufacture their own microinverters for these panels or have rebranded inverters from a supplier. Lot of 11 SunPower P17 345/350W Poly Solar Panel 350 Watts Grade C I am trying to install solar panels in my house and I decided to use sunpower after all my research, but after being quoted on the Series A 327W â AC i found the new panel came out of Series A 400W, i asked them to quote me on that and their quote is 19% higher on the price even thought the A 327 Ac need 46 panels and the A 400 Need 38 Panels 4.54 892 Reviews. When it comes to Sunpower solar panels, itâs really hard to see their entire price. i. SunPower E-Series: E20-327 DC. 99 Sort by: SunPower. See specifications, prices, warranty info and reviews for the SPR-A390-G-AC, a 390 Mono-crystalline Silicon solar panel from SunPower. See specifications, prices, warranty info and reviews for the SPR-A400-G-AC, a 400 Mono-crystalline Silicon solar panel from SunPower. Series SUNPOWER SPR-X22-370-D-AC (370W) SOLAR PANEL Current Model Yes Country of Manufacturer MY Wattage PMAX 370 Power Tolerance 0%/+5% Short Circuit Current (ISC) 6.6 Open Circuit Voltage (VOC) 70.1 Module Efficiency 22.7 Temperature Coefficient -0.35 SUNPOWER Portable Solar Panels, Flexible Panel / Monocrystalline Cells / Lightweight/ MC4 Connectors Camping, boats, RV + more (100W) 5.0 out of 5 stars 2 $189.99 $ 189 . Their design allows them to work efficiently even in low light, high temperatures and cloudy conditions. SunPowerâs X-Series solar panels perform particularly well in high-heat conditions and are rigorously tested during the manufacturing process. LG has the NeON R ACe panel, which is based on the NeON R series. SunPower's new A-Series solar panels, released in Spring 2019, deliver the most powerful solar cell and highest wattage solar panels available for your roof. SunPower offers the A-Series AC panel, which uses the same solar cells as the X-Series and has similar specifications. E-Series solar panels wonât deliver your home with as much energy over 25 years as Maxeon solar panels but still around 20% more than conventional panels. Current prices of SunPower solar panels. The future of solar is now. With the world's first 400+ watt solar panels , the A-Series solar panels deliver the most power per square foot possible, so you can save more while using less space.