Renogy 100 Watts 12 Volts Monocrystalline Solar Panel Bundle Kit with 30A Negative ground Charge Controller+9in MC4 Adaptor Kit Authorized UL 1703 photovoltaic modules and panels. EL tested solar modules; no hotspot heating guaranteed. Withstand strong wind (2400Pa)/heavy snow (5400Pa), Excellent performance in low light environments. The charge controller has been upgraded to Renogy's new 30A PWM negative ground charge controller - the Renogy Wanderer. Negative grounding controller ensures the broader off grid applications and safety, especially to be used on a vehicle which has battery negative on the chassis. The system can be extended up to 400watt in parallel connection.