One of the Best Battery Charging Solar Modules in the World! 17.7 Volt (max), 90 Watt, 5.1 Amp, 1038 x 527 x 46mm, 7.4Kg    Solar modules can be used on their own, linked together or used in conjunction with wind turbines to produce usable power. This power can be used to charge batteries (among other things!) which in turn can power your household appliances. Free energy from the Sun! For more about Renewable Energy see the Links page (to the left)   The SunPower SPR-90 is ideal for a wide range of off-grid applications where high battery-charging current from a small footprint is desirable. Our mono-crystalline silicon solar cells combine higher voltage per cell with an extremely low voltage-temperature coefficient to enable superior battery charging performance at high operating temperature. Exceptional low-light performance and broad spectral response further enhance energy delivery in all weather conditions, year round.

Features and Benefits • A sturdy, anodized aluminium frame with mounting holes to match the industry    norm, enables easy installation on currently available mounting structures. • Over 5.1 amps of peak battery charging current • Unique back-contact solar cells with conversion efficiency up to 21.5% • Extremely  low voltage-temperature coefficient ensures maximum battery    charging current is available even during high-temperature operation • Exceptional low-light performance and high sensitivity to light across the entire    solar spectrum maximises yearly charging performance in any weather • Highest quality 4mm-thick high-transmission strengthened glass provides    enhanced stiffness and impact resistance • Aerospace style cell interconnects with in-plane strain relief, to provide    extremely high reliability • Advanced EVA encapsulation system with multilayer backsheet provides    excellent long-term package durability

Physical Characteristics   Physical Dimensions 1038 x 527 x 46mm (including controller) Weight 7.4Kg

Electrical Performance Electrical Characteristics at Standard Test Conditions (STC)* Minimum Peak Power (Pmin) Watt 90 Rated Voltage (Vmp) Volts 17.7 Rated Current (Imp) Amps 5.1 Open Circuit Voltage (Voc) Volts 21.2 Short Circuit Current (Isc) Amps 5.5 Series Fuse Rating 15A Maximum System Voltage 120V Temperature Coefficient (Pmax) (Voc) (Isc) /°C /°C /°C -0.38% -60.8mV 2.2mA Module Efficiency 16.5% PTC Rating 82.3W *STC is defined as: irradiance of 1000W/m2, spectrum Am 1.5g   and cell temperature of 25°C.