RENOGY&reg; Boat Solar Kit 100W: One 100W Mono Bendable Solar Panel + 10A Dual Battery Charge Controller + 20' MC4 Adapter Kit + Two 8' Tray Cable 10 Amp PWM Duo Battery Charge Controller allows for charging more than one battery simultaneously. Bypass diodes minimizes performance drop due to partial shade and prevent battery discharge at night. Ideal for storage in tight spaces or crowded areas that are typically off limits for traditional glass and aluminum models. Can be installed without costly structural roof reinforcements. Holes on panels are pre-drilled for fast mounting and securing, perfect for non-permanent installations.