{"product_id":"firduo-sea-lion-120a-water-cooled-esc-for-efoil-hydrofoil","title":"Firduo Sea Lion 120A Water-Cooled ESC for Efoil \u0026 Hydrofoil","description":"\u003ch3\u003e🌊 120A Continuous. Water-Cooled. Built for eFoil.\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eFirduo Sea Lion 120A Water-Cooled ESC\u003c\/strong\u003e is a high-current speed controller engineered specifically for RC boat, eFoil, and hydrofoil applications. With \u003cstrong\u003e120A continuous \/ 240A burst (10s)\u003c\/strong\u003e output, active water cooling, and waterproof construction, the Sea Lion 120A delivers reliable, sustained power for demanding water sport builds.\u003c\/p\u003e\n\u003cp\u003eDesigned with top-quality electronic components for enhanced current endurance, the Sea Lion 120A features excellent start-up, acceleration, and linearity characteristics. Multiple protection systems — stall, low voltage, over-heat, and signal loss — keep your build safe. Program via \u003cstrong\u003eLCD Program Card\u003c\/strong\u003e for precise tuning. Available as ESC only or bundled with the LCD Programming Card.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/cdn.shopifycdn.net\/s\/files\/1\/0227\/7805\/2685\/files\/3-3.jpg?v=1605772385\" alt=\"Firduo Sea Lion 120A Water-Cooled ESC for eFoil Hydrofoil Front View\"\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/cdn.shopifycdn.net\/s\/files\/1\/0227\/7805\/2685\/files\/4-4.jpg?v=1605772456\" alt=\"Firduo Sea Lion 120A ESC Water Cooling Pipe 4.6mm Side View\"\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e⚡ Key Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ \u003cstrong\u003e120A Continuous \/ 240A Burst (10s)\u003c\/strong\u003e — high sustained current for eFoil and hydrofoil motor drives\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eActive Water Cooling\u003c\/strong\u003e — 4.6mm water cooling pipe keeps ESC temperature stable under sustained load\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eWaterproof structure\u003c\/strong\u003e — splash-proof construction with water-cooled heat sink for marine environments\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003e5–12S LiPo Input\u003c\/strong\u003e — wide voltage range compatible with common eFoil battery configurations\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eBidirectional Forward\/Backward\u003c\/strong\u003e — selectable forward-only or forward\/reverse operation\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eMultiple Protection Systems\u003c\/strong\u003e — stall protection, low voltage cutoff, over-heat protection, signal loss protection\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eLCD Program Card\u003c\/strong\u003e — easy parameter tuning and firmware updates via multiple methods\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eExcellent Start-up \u0026amp; Linearity\u003c\/strong\u003e — smooth throttle response optimized for RC boat and eFoil applications\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eCompact Form Factor\u003c\/strong\u003e — 105×48×23mm, 230g — fits tight enclosure installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e📋 Full Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eContinuous Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e120A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBurst Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e240A (up to 10 seconds)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5S–12S LiPo (18.5V–44.4V)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBEC Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo BEC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWater Cooling Pipe\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e105 × 48 × 23mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e230g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower \u0026amp; Motor Wire\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12AWG silicone wire, 160mm, no connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSignal Wire\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite\/black with JR male, 300mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDrive Direction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eForward only \/ Forward+Backward (selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProtection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStall, low voltage, over-heat, signal loss\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProgramming\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLCD Program Card \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e📦 What's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eESC variant\u003c\/strong\u003e: 1× Firduo Sea Lion 120A ESC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLCD Programming Card variant\u003c\/strong\u003e: 1× LCD Programming Card (for parameter tuning without PC)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003e⚠️ No BEC — receiver\/remote must be powered separately.ESC's waterproof rating is \u003cspan\u003ewaterproof-Splash protection\u003c\/span\u003e; it cannot be used underwater.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e🔗 Compatible Builds \u0026amp; Recommended Pairings\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eeFoil \/ Hydrofoil\u003c\/strong\u003e — 120A continuous suits 65111 motor builds at 10S–12S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRC Boat \/ USV\u003c\/strong\u003e — bidirectional mode and excellent linearity for precision boat control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectric Surfboard\u003c\/strong\u003e — compact 105×48×23mm fits tight waterproof enclosures\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Motor (2KW)\u003c\/strong\u003e: \u003ca rel=\"noopener\" title=\"Firduo 65111 IP68 Waterproof Brushless Motor 150KV 2KW for Efoil\" href=\"https:\/\/firduo.com\/collections\/firduo-motor\/products\/waterproof-ip68-sensorless-brushless-motor-65111-for-diy\" target=\"_blank\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cspan style=\"color: #0000ff;\"\u003e\u003cspan style=\"text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003eFirduo 65111 150KV IP68 Waterproof Motor\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e — 2KW peak, 10mm shaft, matched for 120A ESC at 10S–12S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Motor (6KW)\u003c\/strong\u003e: \u003ca rel=\"noopener\" title=\"Firduo Waterproof Brushless Motor 65162 120KV 6KW for Efoil \u0026amp; Ejet boards\" href=\"https:\/\/firduo.com\/collections\/firduo-motor\/products\/brushless-sensored-motor-amphibious-fully-waterproof-motor-65161-120kv-6000w-for-efoil-ejet-boards-ebike\" target=\"_blank\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cspan style=\"color: #0000ff;\"\u003e\u003cspan style=\"text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003eFirduo 65162 120KV 6KW Waterproof Motor\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e — for higher power builds; pair with Sea Lion 200A for full power\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigher Current ESC\u003c\/strong\u003e: \u003cspan style=\"text-decoration: underline;\"\u003e\u003ca rel=\"noopener\" title=\"Firduo Sea Lion 200A Water-Cooled ESC for Efoil \u0026amp; RC Boat\" href=\"https:\/\/firduo.com\/collections\/firduo-esc\/products\/firduo-sea-lion-200a-water-cooled-esc-for-efoil-rc-boat\" target=\"_blank\"\u003e\u003cspan style=\"color: #0000ff;\"\u003eFirduo Sea Lion 200A Water-Cooled ESC\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e — upgrade for 65162 motor builds requiring 200A continuous\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVESC Alternative\u003c\/strong\u003e: \u003cspan style=\"text-decoration: underline;\"\u003e\u003ca rel=\"noopener\" title=\"Firduo Manatee 100 75V 100A Water-Cooled ESC – VESC Compatible\" href=\"https:\/\/firduo.com\/collections\/firduo-esc\/products\/firduo-manatee100-high-voltage-75v-high-current-100a-esc-base-on-vesc-with-water-cooling-enclosure\" target=\"_blank\"\u003e\u003cspan style=\"color: rgb(0, 0, 255); text-decoration: underline;\"\u003e\u003cspan style=\"text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003eFirduo Manatee 100 75V 100A VESC\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e \u003c\/span\u003e— open-source VESC platform with full telemetry and UART remote support\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Remote\u003c\/strong\u003e: \u003cspan style=\"text-decoration: underline;\"\u003e\u003ca rel=\"noopener\" title=\"Firduo VX3 Waterproof Remote UART \u0026amp; PWM for Efoil \u0026amp; Electric Surfboard\" href=\"https:\/\/firduo.com\/collections\/firduo-remote\/products\/fully-waterproof-remote-controller-vx3-for-electric-surfboard-efoil-and-electric-skateboard\" target=\"_blank\"\u003e\u003cspan style=\"color: #0000ff;\"\u003eFirduo VX3 IP67 Waterproof Remote\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e — PPM mode compatible with Sea Lion ESC signal input\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Connector\u003c\/strong\u003e: \u003ca href=\"https:\/\/firduo.com\/collections\/other\/products\/friduo-120a-high-current-high-voltage-waterproof-plug-socket-for-electric-hydrofoil-surfboard-thruster-ejet-board-electric-bicycle\" title=\"Firduo 120A High Current and High Voltage Waterproof Connector for Efoil \u0026amp; Surfboard \u0026amp; Ebike\" rel=\"noopener\" target=\"_blank\"\u003e\u003cspan style=\"color: #0000ff;\"\u003eFirduo 120A Waterproof Power Connector\u003c\/span\u003e\u003c\/a\u003e\u003cspan style=\"color: rgb(0, 0, 255);\"\u003e\u003ca href=\"https:\/\/firduo.com\/products\/8420005216434\" style=\"color: rgb(0, 0, 255);\" target=\"_blank\"\u003e \u003c\/a\u003e\u003c\/span\u003e\u003ca href=\"https:\/\/firduo.com\/products\/8420005216434\" style=\"color: rgb(0, 0, 255);\" target=\"_blank\"\u003e\u003c\/a\u003e —for sealed battery-to-ESC connection.For ESC-to-motor, the \u003ca href=\"https:\/\/firduo.com\/collections\/other\/products\/friduo-120a-high-current-high-voltage-waterproof-connector-for-electric-hydrofoil-surfboard-thruster-ejet-boards-ebike\" title=\"Firduo 120A High Current and High Voltage Waterproof Plug Socket for Electric Hydrofoil \u0026amp; Surfboard\" rel=\"noopener\" target=\"_blank\"\u003e\u003cspan style=\"text-decoration: underline; color: rgb(0, 0, 255);\"\u003eFirduo 120A Waterproof Connector\u003c\/span\u003e\u003c\/a\u003e is recommended.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLCD Programming Card\u003c\/strong\u003e: Available as a separate variant ($34) — select \"Lcd programming card\" above for parameter tuning without a PC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e🛠️ Setup Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify voltage compatibility\u003c\/strong\u003e — confirm your battery is within \u003cstrong\u003e5S–12S LiPo (18.5V–44.4V)\u003c\/strong\u003e. The Sea Lion 120A has no BEC — you must power your receiver\/remote separately from a standalone BEC or receiver battery. Do not connect the ESC signal wire to a BEC output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnect motor phase wires\u003c\/strong\u003e — connect the 3× 12AWG motor wires (160mm) to your motor phase outputs. Rotation direction is set by swapping any two phase wires. Test rotation direction at low throttle before installing the propeller.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnect water cooling\u003c\/strong\u003e — attach the 4.6mm water cooling inlet and outlet to your board's water circuit. Ensure water flows through the ESC before running at high current. Use appropriate barb fittings and secure with hose clamps to prevent leaks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnect battery\u003c\/strong\u003e — use a high-current connector rated for 120A+ (Firduo 120A–250A waterproof connector recommended). Use an anti-spark switch or pre-charge resistor to prevent connector arcing. Verify polarity before connecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnect signal wire\u003c\/strong\u003e — connect the JR male signal wire (white\/black, 300mm) to your receiver's throttle channel output. The Sea Lion uses standard PPM signal — compatible with most RC receivers and the VX3 remote in PPM mode.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProgram the ESC\u003c\/strong\u003e — use the \u003cstrong\u003eLCD Program Card\u003c\/strong\u003e (available as a separate variant) to set throttle range, drive direction (forward only or forward\/reverse), low voltage cutoff, and other parameters. Calibrate throttle endpoints with your remote before first use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater test at low power\u003c\/strong\u003e — start at 20–30% throttle in calm water. Verify smooth motor operation, check water cooling flow (ESC should remain cool), and confirm all connections are sealed before increasing to full power.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003chr\u003e\n\u003ch3\u003e❓ FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ1: What is the difference between the Sea Lion 120A and the Sea Lion 200A?\u003c\/strong\u003e\u003cbr\u003eThe \u003cstrong\u003eSea Lion 120A\u003c\/strong\u003e delivers 120A continuous \/ 240A burst and is suited for builds using the 65111 motor (2KW) at 10S–12S. The \u003ca rel=\"noopener\" title=\"Firduo Sea Lion 200A Water-Cooled ESC for Efoil \u0026amp; RC Boat\" href=\"https:\/\/firduo.com\/collections\/firduo-esc\/products\/firduo-sea-lion-200a-water-cooled-esc-for-efoil-rc-boat\" target=\"_blank\"\u003e\u003cspan style=\"color: #0000ff;\"\u003eSea Lion 200A\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/firduo.com\/products\/6088952250546\" style=\"color: rgb(0, 0, 255);\" target=\"_blank\"\u003e\u003c\/a\u003e delivers 200A continuous and is designed for higher-power builds using the 65162 motor (6KW) at 12S–16S. Choose 120A for lighter, lower-power builds; choose 200A for maximum performance with the 65162 motor.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ2: Does the Sea Lion 120A have a BEC? How do I power my receiver?\u003c\/strong\u003e\u003cbr\u003eNo — the Sea Lion 120A has \u003cstrong\u003eno BEC output\u003c\/strong\u003e. You must power your receiver or remote receiver separately using a standalone BEC (5V regulated) or a small receiver battery. Connect the BEC output to the receiver's power input, and connect the ESC signal wire (JR male) to the receiver's throttle channel. Do not attempt to draw receiver power from the ESC's signal wire.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ3: How does the water cooling work, and is it required?\u003c\/strong\u003e\u003cbr\u003eThe Sea Lion 120A uses \u003cstrong\u003eactive water cooling\u003c\/strong\u003e via a 4.6mm cooling pipe. Water is drawn from your board's water intake, circulated through the ESC's internal cooling channel, and expelled. This is required for sustained high-current operation — without water cooling, the ESC will overheat at 120A loads. Brief low-power testing without cooling is acceptable, but always ensure water flow before full-power riding.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ4: Can I use the Sea Lion 120A with a VESC-based remote like the VX3?\u003c\/strong\u003e\u003cbr\u003eThe Sea Lion 120A uses \u003cstrong\u003estandard PPM signal input\u003c\/strong\u003e — it is not a VESC-based ESC and does not support UART communication. The \u003ca rel=\"noopener\" title=\"Firduo VX3 Waterproof Remote UART \u0026amp; PWM for Efoil \u0026amp; Electric Surfboard\" href=\"https:\/\/firduo.com\/collections\/firduo-remote\/products\/fully-waterproof-remote-controller-vx3-for-electric-surfboard-efoil-and-electric-skateboard\" target=\"_blank\"\u003e\u003cspan style=\"color: #0000ff;\"\u003eVX3 remote\u003c\/span\u003e\u003c\/a\u003e supports PPM mode, making it compatible with the Sea Lion 120A in PPM mode. However, UART telemetry features (motor power, temperature display on VX3 screen) will not be available — only basic throttle control. For full UART telemetry, use a VESC-based ESC such as the \u003ca title=\"Firduo Manatee 100 75V 100A Water-Cooled ESC – VESC Compatible\" href=\"https:\/\/firduo.com\/collections\/firduo-esc\/products\/firduo-manatee100-high-voltage-75v-high-current-100a-esc-base-on-vesc-with-water-cooling-enclosure\"\u003e\u003cspan style=\"color: #0000ff;\"\u003eManatee 100\u003c\/span\u003e.\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ5: How do I program the Sea Lion 120A without a PC?\u003c\/strong\u003e\u003cbr\u003eUse the \u003cstrong\u003eLCD Programming Card\u003c\/strong\u003e (available as a separate variant on this page for $34). Connect the programming card to the ESC's signal wire, power on the ESC, and navigate the card's menu to set throttle range, drive direction, low voltage cutoff, brake strength, and other parameters. This is the easiest method for field programming without a laptop. Alternatively, use the USB adapter with PC software for more advanced configuration and firmware updates.\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg style=\"float: none;\" alt=\"Firduo Sea Lion 120A ESC Application eFoil RC Boat Hydrofoil Dimension\" src=\"https:\/\/cdn.shopifycdn.net\/s\/files\/1\/0227\/7805\/2685\/files\/875bcfb0095bf687588cea131f89c5e1.jpg?v=1605772477\"\u003e\u003c\/div\u003e","brand":"Firduo","offers":[{"title":"120A ESC","offer_id":44247067459762,"sku":"Sea Lion 120","price":125.0,"currency_code":"USD","in_stock":true},{"title":"Lcd programming card","offer_id":44247067492530,"sku":"Lcd programming card","price":34.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0227\/7805\/2685\/products\/1_bf3dab80-0ccc-49a5-b58e-bcf357cfba61.jpg?v=1605772659","url":"https:\/\/firduo.com\/products\/firduo-sea-lion-120a-water-cooled-esc-for-efoil-hydrofoil","provider":"Firduo","version":"1.0","type":"link"}