ROCKSOLAR 20A PWM Solar Charge Controller
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ROCKSOLAR 20A PWM Solar Charge Controller
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What it is, and what it is for
ROCKSOLAR 20 A PWM Solar Charge Controller
A 20 A PWM controller for a small 12 V or 24 V solar setup: one or two 12 V-nominal panels keeping a battery topped up on a boat, gate opener, shed or parked RV. It is sealed to IP67, so it can live outdoors in the weather.
A PWM controller connects the panel to the battery directly and pulses the connection to regulate charge. It is simple and reliable, but it cannot use any panel voltage above the battery voltage, so it suits 12 V-nominal panels and arrays under about 250 W at 12 V. For a larger array, or panels with a higher voltage, an MPPT controller harvests 20 to 30 percent more.
Size the controller to the panel's short-circuit current with 25 percent headroom, and fuse the battery side. Wiring is for reference; a licensed electrician should make the connections on a permanent installation.
Every number, by component.
The figures the manufacturer publishes. The datasheet above is the reference if the two ever differ.
| Rated charging current | 20 A |
|---|---|
| Nominal system voltage | 12 V or 24 V, auto-detected |
| Charging | 4-stage PWM: bulk, absorption, float, equalisation |
| Battery types | Flooded, AGM and gel; lithium mode for LiFePO4 |
| Display | Backlit LCD: charge current, energy, temperature, battery voltage, error codes |
| Protection | Overcharge, over-discharge, short circuit, reverse polarity, overload |
| Enclosure | IP67, suitable for outdoor mounting |
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