XTM 20A PWM Solar Controller
Instruction Manual
Safety Information
- Read all instructions before installation.
- Do not disassemble or attempt repairs.
- Install external fuses or breakers as required.
- Disconnect solar modules and battery fuses/breakers before installation or moving.
- Ensure power connections are tight to prevent overheating.
- Only charge compatible batteries.
- Battery connections can be to a single battery or a bank.
- Risk of electric shock: PV and load can produce high voltages.
Main Features
- IP67 waterproof level and aluminum shell for corrosion resistance.
- 12V system voltage.
- LED numeric display and waterproof keys for ease of use.
- Upgraded 3-stage PWM charging with weekly equalizing charge to extend battery life.
- Charging program options for 12V Sealed, Gel, Flooded Lead-Acid, and LiFePO4 batteries.
- External temperature sensor for precise temperature compensation.
- Parameter setting memory prevents repeated setup.
- Multiple mode indicators.
- Protection against overcharge, over-discharge, overload, short-circuit, and reverse connection.
- TVS lightning protection.
Installation and Wiring
The XTM controller is for 12V systems. Connect the battery first, then the controller recognizes the voltage.
Connection Procedure:
- Connect the battery first.
- Connect the loads to the controller's load output terminals (current must not exceed rated current; larger loads connect directly to the battery).
- Connect the solar panel (PV). The solar panel indicator lights up if there is sunlight.
Warning: Incorrect connection will damage the controller.
Terminal Identification:
- ① Solar Module Terminals With Fuse
- ② Battery Terminals With Fuse
- ③ Load Terminals With Fuse
- ④ Temperature Sensor
- ⑤ Charging Status LED Indicator
- ⑥ Battery Status LED Indicator
- ⑦ Load Indicator
- ⑧ Mode Display
- ⑨ Key Press Switch
- ⑩ Aluminum Housing
Battery Type Selection:
Step 1: Long press the key for 3 seconds; the mode number will flash.
Step 2: Press the key to select the mode number corresponding to the battery type:
- Mode 1: 12V Sealed lead-acid battery
- Mode 2: 12V Gel lead-acid battery
- Mode 3: 12V Flooded lead-acid battery
- Mode 4: 12V LiFePO4
Step 3: Press the key for 3 seconds to confirm.
Step 4: The controller will restart automatically.
Mounting
It is recommended to place the battery and controller in the same environment.
Mount the controller to a solid platform. Dimensions:
- Overall dimension: 82x100x20(mm)
- Installation dimension: 86x75(mm)
- Installation hole diameter: 3.5(mm)
Suggestion for Use
- When powered on, the controller automatically recognizes the battery voltage. Connect the battery first to ensure a sound connection.
- Install the controller in a well-ventilated area as it generates heat during operation.
- The controller measures ambient temperature for battery charging compensation.
- Cable size depends on conductor type and distance from the solar panel. Consult a cable size chart.
- Fully charge the battery regularly (recommended monthly) to maintain performance.
Indicators Description and Operation
| Indicator | Status | Instruction |
|---|---|---|
| Solar panel (PV) | On Solid | Charging |
| Off | No solar panel voltage (night) or connection problem. | |
| Slowly Flashing | Solar panel connection normal but low voltage (irradiance), no charging. | |
| BATT | On Solid | Normal |
| Double Flashing | Full | |
| Slowly Flashing | Under voltage | |
| Fast Flashing | Over discharged | |
| LOAD | On Solid | Load ON |
| Off | Load OFF | |
| Slowly Flashing | Over Load | |
| Fast Flashing | Short Circuit |
Setting Methods
Battery Type Selection:
- Long press key press switch for 3 seconds, the mode number will flash.
- When indicator flash, press key switch to select suitable mode number. Mode number shows battery type as below table.
- Press key switch for 3 seconds to confirm battery type.
- Controller will re-start automatically.
Load Control:
- The key can be used to switch the load on/off. Short press for on/off.
- Default setting for loading is off.
Troubleshooting
| Symptoms | Causes and solutions |
|---|---|
| While sunlight is present, the solar panel (PV) indicator does not light up. | Check solar panel connection and contact. |
| The solar panel (PV) charging indicator is flashing quickly. | System overvoltage. Check battery voltage. |
| The solar panel (PV) indicator is off and battery voltage is normal, but there is no output. | The load will be switched on automatically after one minute. The battery may be failing to supply power. Check battery connection. |
| The battery indicator does not light up. | Check battery connection. |
| The battery indicator is flashing quickly and there is no output. | The battery is over-discharged; it will recover when recharged adequately. |
| The load indicator is flashing slowly and there is no output. | Load power exceeds rated power. Reduce power-consuming devices and long press the key to recover. |
| The load indicator is flashing quickly and there is no output. | The load is short-circuited. After resolving the issue, long press the key to recover. |
| The load indicator is steady on and there is no output. | Check power-consuming device connections and reliability. Check wiring and system voltage recognition. |
Technical Specifications
g| Parameter | Sealed | GEL | Flooded | LiFePO4-4S | Unit |
|---|---|---|---|---|---|
| System current | 20 | A | |||
| No-load loss | 10 | mA | |||
| Solar energy input voltage | <55 | V | |||
| System voltage | 12 | V | |||
| Overvoltage protection | 17.0 | 17.0 | 17.0 | 16.6 | V |
| Equalizing charging voltage | 14.6 | 14.8 | - | - | V |
| Boost charging voltage | 14.4 | 14.2 | 14.6 | - | V |
| Floating charging voltage | 13.8 | 13.8 | 13.8 | - | V |
| Overcharge recovery voltage | 13.6 | V | |||
| Boost charging recovery voltage | 13.2 | 13.2 | 13.2 | - | V |
| Over-discharge recovery voltage | 12.5 | 12.5 | 12.5 | - | V |
| Undervoltage protection | 12.0 | 12.0 | 12.0 | 11.2 | V |
| Over-discharge voltage | 11.0 | 11.0 | 11.0 | 10 | V |
| Temperature compensation | -4.0mv/°C/2V | ||||
| Equalizing charging duration | 1 | 4 | 1 | 4 | hour |
| Boost charging duration | 1 | hour | |||
| Overload protection | 1.25 times of rated current: 30 seconds; 1.5 times of rated current: 5 seconds | ||||
| Short-circuit protection | Over three times of rated current | ||||
| Operating temperature | -35°C to +65°C | ||||
| Protection degree | IP67 | ||||
| Weight | 300 | ||||
| Dimensions | 82x100x20(mm) | ||||
Disclaimer
The goods come with guarantees that cannot be excluded under the Australian Consumer Law. Consumers are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. Goods are also entitled to be repaired or replaced if they fail to be of acceptable quality and the failure does not amount to a major failure.
PLU: 690249 CODE: SL2420
Manufactured & packaged for SRGS PTY LTD
ABN 23 113 230 050
6 Coulthards Avenue, Strathpine QLD 4500, Australia
MADE IN CHINA
