LNEX CTM12-10
(7 reviews)
A waterproof, ultra-thin 10A PWM solar charge controller: the LNEX CTM12-10 protects your battery even when exposed to rain and sea spray.
Characteristics
- Type: PWM, 10A
- Waterproofing: IP65, ultra-thin 22mm housing
- Voltage: 12/24V automatic
- Compatibility: LiFePO4, AGM, Gel, lead-acid
- PWM 10A, IP65 waterproof, LCD screen, temp sensor
Detailed overview: LNEX CTM12-10 10A PWM solar charge controller
The LNEX CTM12-10 is a PWM (Pulse Width Modulation) solar charge controller built for small photovoltaic setups running on 12V or 24V, with automatic voltage detection. Its job is to protect a battery from overcharging while cleanly managing the charge coming from one or more small solar panels, for a converted camper van, a boat, an off-grid cabin, a garden shed or any nomadic use.
Its main distinguishing feature is the IP65 waterproof housing and ultra-thin profile (around 22mm thick), one of the slimmest controllers of its kind on the market. It stays fully operational when exposed to sea spray, rain or condensation, a real advantage for an outdoor or semi-outdoor installation, unlike most standard PWM controllers that require indoor mounting.
On the technical side, it applies smart 5-stage charging (soft start, bulk, absorption, float and equalisation), with an included temperature sensor to precisely adjust charging voltage based on ambient heat. It is compatible with LiFePO4, AGM, Gel, flooded lead-acid, calcium and EFB batteries, making it versatile enough for a modern lithium battery as well as an older lead-acid bank. The backlit LCD screen and LED indicators display charging current and battery voltage in real time, with two buttons (TYPE and AMP/VOLT) to navigate the settings.
Protections cover over-temperature, over-voltage, over-current, overcharge, over-discharge, overload and short-circuit. Two honest limitations to know before buying: the screen only shows amps, never power in watts, and the housing has no front access flap for wiring, so the unit must be pre-wired before final mounting. With 10A of charging current, it suits small setups, around 130W of panels at 12V and 260W at 24V. For an outdoor installation exposed to the weather, the CTM12-10 remains a solid, affordable choice in the LNEX range.
Full specifications
Detailed characteristics
Solar section
| Max solar input?Maximum connectable PV power. | 260 W |
|---|
Connectivity
| Bluetooth?Monitoring and settings via an app over Bluetooth. | No |
|---|---|
| Wi-Fi?Remote control and updates over Wi-Fi. | No |
Durability and format
| Ingress protection?Water and dust resistance (IP rating). | IP65 |
|---|---|
| Weight?Weight of the battery. | 0.283 kg |
| Dimensions (L × W × H)?Length × width × height, in millimetres. | 108 × 22 × 131 mm |
Comparison
In its price and power range, the LNEX CTM12-10 competes directly with several popular 10A PWM controllers, notably in searches like "LNEX vs Victron BlueSolar" or "waterproof 10A PWM controller". Here is how it compares to three similar alternatives: the Victron BlueSolar PWM-LCD&USB 10A, a long-standing reference in the category; the EPEVER LS1012EU, a very common entry-level model; and the Y&H 10A PWM Dual USB, one of the cheapest options on the market.
| Criterion | LNEX CTM12-10 | Victron BlueSolar PWM-LCD&USB 10A | EPEVER LS1012EU | Y&H 10A PWM Dual USB |
|---|---|---|---|---|
| Type | PWM | PWM | PWM | PWM |
| Charging current | 10 A | 10 A | 10 A | 10 A |
| Waterproofing | IP65 (outdoor use) | No (indoor use) | No (indoor use) | No (indoor use) |
| Screen and monitoring | Backlit LCD, included temperature sensor | Built-in LCD, USB port | Basic LCD, USB port | LCD, dual USB port |
| Housing thickness | ≈ 22 mm (ultra-thin) | Standard housing | Standard housing | Standard housing |
| Observed price | €54.38 | ≈ €33.89 | ≈ €17.81 | ≈ €12 |
In short, the LNEX CTM12-10 clearly stands out for its IP65 waterproofing and ultra-thin housing, two advantages the Victron BlueSolar, EPEVER LS1012EU and Y&H all lack, even though they remain reliable for standard indoor use. The Victron is still the safe bet for an indoor install, while the EPEVER and Y&H win on raw price. But for a setup genuinely exposed to the weather (boat, van, outdoors), the CTM12-10 remains the most sensible choice.
Related video
Video: LNEX 10A WATERPROOF SOLAR CHARGE CONTROLLER - Published on 17/11/2022
Our tester's review: Julien De Jurquet
On a small camper van solar kit, this LNEX lives up to its waterproofing claim: left outside in the rain for several weeks, it kept working without a single hiccup. The backlit LCD screen stays sharp and readable even in bright sunlight, and the included temperature sensor is reassuring for charging accuracy, especially in winter. The ultra-thin housing slots easily into a tight wall cavity where a standard controller simply would not fit. Two honest downsides to know before buying: the screen only shows amps, never watts, so you have to work out real power yourself, and there is no front flap for wiring, meaning you have to pre-wire the unit before screwing it into place. For a small 12/24V setup planned properly from the start, whether with a lead-acid or lithium battery, the ruggedness-to-price ratio remains convincing.
Frequently asked questions: LNEX CTM12-10 10A PWM solar charge controller
It is a PWM (Pulse Width Modulation) controller, not MPPT. It works very well for small setups but captures a bit less energy than an MPPT controller under cloudy or low-light conditions.
With 10A of charging current, it suits small setups: around 130W of panels at 12V and 260W at 24V. Beyond that, you should look at a higher-power model.
Yes, it carries an IP65 rating, and several users report installing it outdoors, exposed to rain and sea spray, without any issues.
Yes, it supports LiFePO4, AGM, Gel, flooded lead-acid, calcium and EFB batteries, with 5-stage charging tailored to each battery type.
No, the LCD screen only shows current in amps and battery voltage, never a direct wattage figure. You need to calculate power yourself if needed.
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Published on 01/09/2026