The Go Power Potted Charge Controllers are a great choice for outdoor or industrial use as they are weatherproof.
GP-PC-10: 10 AMP PWM POTTED SOLAR CONTROLLER 12/24V
GP-PC-20: 20 AMP PWM POTTED SOLAR CONTROLLER 12/24V
GP-MPPT-85/20: 20 AMP MPPT POTTED SOLAR CONTROLLER 85 VDC