ROCKSOLAR 20A MPPT Solar Charge Controller
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ROCKSOLAR 20A MPPT Solar Charge Controller
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What it is, and what it is for
ROCKSOLAR 20 A MPPT Solar Charge Controller
A 20 A MPPT controller for a 12 V or 24 V LiFePO4 or lead-acid battery, rated for 260 W of panels at 12 V or 520 W at 24 V, with a 75 V open-circuit limit that takes one full-size 60-cell panel or two 12 V-nominal panels in series: a van, boat, shed or small cabin. An MPPT controller tracks the panel's maximum power point and converts the surplus voltage into extra charging current, which is worth 20 to 30 percent more harvest than a PWM controller, most of it on cold, bright days and whenever the panel voltage sits well above the battery voltage.
Choose this one for a single 200 W to 450 W panel, or two smaller panels, charging a 12 V house battery; for anything larger go to the 40 A or 60 A model.
Keep the array's open-circuit voltage under the controller's PV limit on the coldest morning of the year, wire extra panels in parallel rather than in series, and fuse the battery side. Mounting and wiring are for reference; a licensed electrician should make the connections on a permanent installation.
Published before you buy. No email required.
Every number, by component.
The figures the manufacturer publishes. The datasheet above is the reference if the two ever differ.
|
Model |
POW-Keeper1220 |
|
PV Input |
|
|
Max Open Voltage of PV Module |
75Vdc |
|
MPP Tracking Efficiency |
99.50% |
|
MAX PV POWER |
260W for 12V system, 520W for 24V system |
|
Charge Mode |
|
|
Charge Algorithm |
3 Stage |
|
Battery Type |
Lithium and Lead Acid Battery |
|
Nominal System Voltage |
12/24V |
|
Rated Charging Current |
20A |
|
Battery Voltage Range |
8~32V |
|
High Voltage Disconnection |
16V (24V x 2) |
|
Duration for absorption charging |
2 hours |
|
Charge Loop Voltage Drop |
≤0.29V |
|
Self-consumption |
≤ 9.2mA 12V; ≤ 11.7mA 24V |
|
Equalized Charging Voltage |
AGM: 14.6V; GEL: No; FLd: 14.8V |
|
Absorption Charging voltage |
AGM: 14.4V; GEL: 14.2; FLd: 14.6V |
|
Floating Charging voltage |
AGM/ GEL/ FLd: 13.8V |
|
Low Voltage re-connection (LVR) |
AGM/ GEL/ FLd: 12.6V |
|
Low Voltage Disconnection (LVD) |
AGM/ GEL/ FLd: 10.8V |
|
Environmental |
|
|
Operating Temperature Range |
-20℃~55℃ (To run at full rated current continuously) |
|
LCD Temperature Range |
-20℃~70℃ |
|
Humidity Range |
≤95% No condensation |
|
General Specification |
|
|
Protection Class |
IP30 |
|
Dimension |
123*178*48 |
|
Installation Hole |
108*120 ∅5 |
Before you order.
If yours isn't here, ask an engineer. It costs nothing and it's the step most people skip.
What if I'm not sure this is the right product?
Ask before you order. Send us what you need to run, or your pool or well figures, and an engineer will confirm the choice — it costs nothing. Or use the finder below, which sizes from what you actually run and shows its reasoning.
