All products that we carry are IEC certified for proofing the quality. A broad range of panels in different power scale are listed for your choices. Panels of Monocrystalline Silicon: 160W - 185W Panels of Polycrystalline Silicon: 85W - 290W We warrant the panel maintaining 90% of minimum specification performance along the first 10 years and 80% of minimum specification performance for sequent 15 years. To provide the convenience of  "One Stop Shopping" to our customer. We also supply Solar Power Charge Controller, Deep Cycle Battery and Pure Sine Wave Inverter. "System Integration", "On Sit Survey" and "On Site Installation" are also available upon customer's inquiry