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40A MPPT Solar Charge Controller 12V/24V
40A MPPT controller for cabin and off-grid arrays.
SKU:RS-MPPT40
Regular price
$159.99 USD
40A MPPT charge controller.
12V/24V Auto battery systems.
Handles 550W (12V) / 1100W (24V) of panels.
Multi-stage charging.
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Product Information
40A MPPT Solar Charge Controller for Cabin and Off-Grid Arrays
An MPPT controller tracks the array's maximum power point and converts the surplus voltage into charging current, so it harvests more than a PWM unit from the same panels — most noticeably in cold or low light, and whenever panel voltage sits well above battery voltage.
Keep the array within 550W (12V) / 1100W (24V).
Mount it close to the battery on a vertical surface with airflow around the heatsink, and wire battery first, then panels.
| Specification | Value |
|---|---|
| Nominal System Voltage | 12V/24V Auto |
| Maximum Charging Current | 40A |
| Rated Load Current | 20A |
| Maximum Recommended PV Input Power | 550W (12V) / 1100W (24V) |
| Maximum Solar Input Voltage | 100V (25°C), 90V (-25°C) |
| Maximum PV Input Short Current | 50A |
| Maximum Battery Voltage | 32V |
| Battery Voltage Range | 9V to 35V |
| MPPT Tracking Efficiency | >99% |
| Conversion Efficiency | ≤98% |
| Battery Compatibility | Sealed, Gel, Flooded, Lithium |
| Communication | RS232 (Optional BT-1 Bluetooth Module) |
| Protection Rating | IP32 |
| Maximum Terminal Size | 8 AWG |
| Net Weight | 4.41 lb |
| Dimensions | 9.37 × 6.81 × 2.85 in |
| Package Dimensions | 12 × 9 × 6 in |
| Gross Weight | 6 lb |
- 1 x 40A MPPT Solar Charge Controller 12V/24V
- Mounting or connection hardware as listed in the specifications
- User manual
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Frequently Asked Questions
How many panels can I connect?
Keep the array within 550W (12V) / 1100W (24V). Watts alone are not the whole story — the panels' combined open-circuit voltage must also stay under the controller's input limit.
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 MPPT.
Which batteries does it charge?
Check the battery types listed in the specifications and set the matching profile before first charge.