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20A 12V Waterproof PWM Solar Charge Controller
20A PWM controller for boats, trailers and sheds.
SKU:RS-PWM20WP
Regular price
$34.99 USD
20A PWM charge controller.
Auto-detects your battery voltage.
See specifications for array limits.
IP65 rated.
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Product Information
20A PWM Solar Charge Controller for Boats, Trailers and Sheds
A PWM controller is the simple, economical choice when panel voltage is close to battery voltage — a 12V panel on a 12V battery, for instance. It costs less than MPPT and has less to go wrong, which is why it still suits small RV, boat and shed systems.
Size the array to the limits in the specifications table.
Rated IP65. Mount it close to the battery on a vertical surface with airflow around the heatsink, and wire battery first, then panels.
| Specification | Value |
|---|---|
| Rated solar panel amps | Max. 20AMP |
| Normal input solar cell array voltage | 15-22VDC |
| Max. solar cell array voltage (output has no load) | 25VDC |
| Lowest operating voltage (at solar or battery side) | 8VDC |
| Standby current consumption at night | 5mA |
| Maximum voltage drop-solar panel to battery | 0.25VDC |
| Grounding | Positive Ground |
| Minimum battery start charging voltage | 3VDC |
| Soft start charging voltage | 3-10±0.2VDC |
| Soft start charging current (50% PWM duty) | Up to 10AMP |
| Equalization charging voltage at 25 ℃ | 15.5±0.2VDC |
| Equalization charging timer timeout | 2 Hours |
| Battery temperature compensation coefficient | -24mV/°C |
| Temperature compensation range | -4°F~+122°F |
| Over temperature protection during charging | 149°F |
| Input/output terminal | M5 terminals |
| Controller material | Plastic, Standard ABS |
| Power terminal maximum stranded wire size | #10AWG stranded-5mm² |
| Mounting | Vertical wall mounting |
| IP grade | IP65 |
| Net weight | Approx. 0.3kg/0.66lb |
| Operating temperature | -25~50°C (-13～122℉) |
| Storage temperature | -40~85°C (-40～185℉) |
| Operating Humidity range | 100% no condensation |
- 1 x 20A 12V Waterproof PWM Solar Charge Controller
- The quickest and easiest way to mount the unit is to use the three plastic spacers and self-tapping screws supplied and mount the unit to a flat surface.
- User manual
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Frequently Asked Questions
How many panels can I connect?
Check the maximum PV input power and voltage in the specifications, and keep the array within both.
MPPT or PWM — which do I need?
MPPT harvests more, especially when panel voltage is well above battery voltage or in cold and low light, and it is the better choice for larger or 24V arrays. PWM costs less and suits small systems where panel and battery voltage are closely matched. This unit is PWM.
Which batteries does it charge?
Check the battery types listed in the specifications and set the matching profile before first charge.