Feature: 1. High cell efficiency with quality silicon materials for long term output stability and reliability. 2. Strictly quality control ensure the stability and reliability, totally 23 testing procedure to do quality control 3. High transmittance low iron tempered glass with enhanced stiffness and impact resistance 4. Solar panel connector leads for easy plug and play use Specification: Type: 300W Solar Panel Size:11*15in (28*38cm) Tolerance: +/-5% SLA Battery Voltage: 18V Type of Solar Cell: Polycrystalline Silicon Open Circuit Voltage(Voc): 18V Maximum Ystem Voltage: 18V Temperate Coefficient of Isc: (010+/- 0.01 ) %/C Temperate Coefficient of Voc: - (0.38 +/-0.01 ) %/C Temperate Coefficient of Power Voc: -0.47%/C Temperature Range: -40 to +80 Type 1: 2 X 300W Solar Panel 2 x Connector Cover Type 2: 1 x 40A Solar Controller Type 3: 1 X 300W Solar Panel 1 x Connector Cover Type 4: 1 X 300W Solar Panel 1 x Connector Cover 1 x 40A Solar Controller Type 5: 1 X 300W Solar Panel 1 x Connector Cover 1 x 50A Solar Controller Note: 1. Please allow 1-3cm (0.4-1.18") difference due to manual measurement and slight color variation for different display setting. 2. Due to the light and screen difference, the item's color may be slightly different from the pictures. Please understand.