ETRONIX PHOTON 2.1W 45AMP SPLASHPROOF BRUSHLESS ESC ET0125

Overview

The ETRONIX PHOTON 2.1W 45AMP SPLASHPROOF BRUSHLESS ESC (ET0125) is a compact and robust electronic speed controller engineered for 1/10th scale RC car applications across the UK and beyond. This splashproof brushless ESC delivers exceptional performance and reliability, making it an ideal choice for RC enthusiasts running sensorless brushless motor setups in their buggies, trucks, and racing vehicles. Whether you're a weekend basher or a dedicated RC competitor, this speed controller offers the perfect balance of power delivery, protection, and programmability to enhance your driving experience.

With 45 amps of constant current and an impressive 260-amp burst capacity, the PHOTON 2.1W provides the responsive throttle control and acceleration you need for dynamic RC car performance. The integrated 2-amp 6-volt BEC (Battery Elimination Circuit) ensures stable power delivery to your receiver and servo systems, eliminating the need for separate battery packs and reducing overall weight. This ESC is purpose-built for brushless RC cars, supporting both 2S and 3S LiPo batteries as well as 5–10S NiMH/NiCd battery packs, giving you flexibility in your power system choices.

The splashproof construction protects critical electronics from dirt, water splashes, and moisture that inevitably occur during off-road RC driving sessions. Measuring just 45 x 33 x 37mm (without cooling fan) and weighing only 90 grams, this compact speed controller slots easily into tight engine bays and fits seamlessly into 1/10th scale RC car chassis without consuming excessive space. The PHOTON 2.1W is part of a comprehensive range of Etronix ESCs with ratings from 45A through to 120A, ensuring there's a perfect controller for every 1/10th application and driving style.

Key Features

• Splashproof Construction — The weatherproof design protects your ESC from water splashes, mud, and moisture during outdoor RC car sessions, extending the lifespan of your electronics and reducing the risk of mid-race failures in wet or dusty conditions.
• 45-Amp Constant Current with 260-Amp Burst Capacity — This generous power rating provides smooth, responsive throttle control for consistent acceleration and the ability to handle sudden power demands during aggressive driving manoeuvres or high-speed runs.
• Integrated 2-Amp 6-Volt BEC — The onboard Battery Elimination Circuit supplies clean, regulated power directly to your receiver and servo systems, eliminating the need for separate receiver batteries and streamlining your RC car's electrical system.
• 4-Pole Sensorless Brushless Motor Support — This ESC is optimised for 4-pole sensorless brushless motors, which are the most common motor type in modern 1/10th scale RC cars, offering smooth power delivery without requiring external sensor wiring.
• Multi-Chemistry Battery Compatibility — The PHOTON 2.1W accepts both modern LiPo batteries (2–3S) and traditional NiMH/NiCd packs (5–10S), giving you the flexibility to choose your preferred power system based on your budget and performance requirements.
• Programmable Setup with ET0107 Card — Purchase the optional ET0107 programmable setup card (available separately) to fine-tune ten different ESC parameters, allowing you to customise the controller's behaviour to match your exact driving style and track conditions.
• Compact, Lightweight Design — At just 90 grams and measuring 45 x 33 x 37mm without the cooling fan, this ESC fits comfortably in tight spaces, making it ideal for 1/10th scale buggies, trucks, and racing vehicles where space and weight efficiency are critical.

Technical Performance

The ETRONIX PHOTON 2.1W 45AMP delivers impressive performance characteristics that make it a serious contender for 1/10th scale RC car enthusiasts in the UK and beyond. With a constant current rating of 45 amps and burst capacity reaching 260 amps, this speed controller handles the power demands of high-performance brushless motors whilst maintaining smooth, predictable throttle response. The integrated 2-amp 6-volt BEC ensures stable power delivery to your receiver and servo systems, eliminating voltage sag that can cause erratic steering and throttle behaviour during intense driving sessions.

This splashproof ESC is engineered specifically for 4-pole sensorless brushless motors, the industry standard for modern 1/10th scale RC cars. Motor compatibility is carefully managed through KV limitations: on 2S LiPo batteries you can use motors rated up to 4350KV, whilst 3S LiPo systems support motors up to 2950KV. The controller is not compatible with 4S battery systems, so careful attention to battery cell count and motor KV specifications is essential when selecting your complete power system. The compact construction measures 45 x 33 x 37mm without the cooling fan, weighing just 90 grams, making it one of the lightest and most space-efficient options for 1/10th scale applications. The splashproof rating provides genuine protection against water splashes, mud, and moisture—critical considerations for RC bashers and off-road racers who regularly tackle challenging terrain and weather conditions throughout the UK.

What's in the Box

• ETRONIX PHOTON 2.1W 45AMP SPLASHPROOF BRUSHLESS ESC (ET0125)

What You Need to Complete

• Brushless motor (4-pole sensorless design, compatible with KV limits: 4350KV max on 2S, 2950KV max on 3S)
• 2S or 3S LiPo battery pack, or 5–10S NiMH/NiCd battery pack
• Charger suitable for your chosen battery type
• Motor and battery connectors (3.5mm motor connectors; ESC does not include connectors by default)
• RC car chassis with integrated receiver and servo systems
• Optional: ET0107 programmable setup card for fine-tuning ten ESC parameters (available separately)

Frequently Asked Questions

• Is the ETRONIX PHOTON 2.1W 45AMP ESC suitable for beginners? — Yes, this is an excellent choice for beginners moving into brushless RC car systems. The splashproof design protects against common mistakes, the integrated BEC simplifies wiring, and the 45-amp rating is appropriate for most entry-level and mid-range brushless motors. However, ensure your motor KV rating falls within the specified limits (4350KV max on 2S, 2950KV max on 3S) before purchasing.
• What battery does the PHOTON 2.1W need, and what voltage is compatible? — This ESC accepts 2–3S LiPo batteries or 5–10S NiMH/NiCd packs. The manufacturer explicitly states this controller is 2S/3S maximum and is not compatible with 4S battery systems. Always verify your motor's KV rating against your chosen battery cell count: 4350KV maximum on 2S LiPo, or 2950KV maximum on 3S LiPo.
• Can I use this ESC in my FTX Vantage or FTX Carnage? — The PHOTON 2.1W can be used in the FTX Vantage if you have the brushless variant. However, for heavier trucks like the FTX Carnage, a higher-amperage ESC such as the ET0126 (60 amp version) may be more appropriate due to the vehicle's weight and power demands. Always check your specific vehicle's motor specifications and weight before selecting an ESC.
• What is the difference between the ET0125 and ET0125FTX variant? — The ET0125 is the bare controller with no pre-installed connectors. The ET0125FTX comes factory-fitted with Dean's battery connectors and 3.5mm motor bullet/banana connectors compatible with FTX vehicles. Choose the ET0125 if you're customising your connector setup, or the ET0125FTX if you want plug-and-play compatibility with FTX models.
• Does this ESC have reverse function? — The PHOTON 2.1W range includes controllers with reverse capability (such as the ET0126), though reverse functionality may vary by model. Check your specific ESC documentation or contact RC Model Shop for clarification on reverse features for the ET0125.
• Can I use the ET0107 setup card to programme this ESC? — Yes, the optional ET0107 programmable setup card allows you to fine-tune ten different ESC parameters to customise the controller's performance to your specific driving style and track conditions. The setup card is sold separately.
• What motor connector sizes does this ESC use? — The motor connections use 3.5mm bullet/banana connectors. The ESC itself does not include pre-soldered connectors, so you'll need to source appropriate connectors or choose the ET0125FTX variant which comes pre-fitted with connectors.
• Is the PHOTON 2.1W waterproof or just splashproof? — This ESC is splashproof, meaning it resists water splashes, mud, and moisture during normal RC car use. However, it is not fully waterproof and should not be submerged or exposed to prolonged heavy water contact.

Why Buy from RC Model Shop?

RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the ETRONIX PHOTON 2.1W 45AMP SPLASHPROOF BRUSHLESS ESC ET0125 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.