Keep Your Working Marine Compressor. Upgrade the 1980s Dial to Solar Overcooling.
Cut daily refrigeration battery draw by up to 35%, eliminate frozen produce with +3.0°C safe sub-cooling (+1.5°C with internal circulation fan), and get instant daylight OLED diagnostics. Installs in 15 minutes on Danfoss BD35F/50F electronic units. Zero wire cuts.
🔒 $0.00 Due Today • Zero payment or credit card required
- Direct Drop-In: Plugs into existing C & T terminals on your Danfoss electronic unit in 15 mins.
- Active Solar Sub-Cooling: Safe +3.0°C daytime thermal storage (+1.5°C with internal DC circulation fan via 'F' terminal); idles quietly overnight.
- Physical Analog Failsafe: Dedicated flip-switch for uninterrupted cooling mid-ocean.
- Instant Reward: Free download of the Marine Refrigeration Solar Optimization Guide (PDF) upon reservation.
🛡️ Ethical Demand Validation: No payment is charged today. You will receive an invitation to inspect final marine test bench results prior to shipment with zero purchase obligation.
Verify Your Vessel's Marine Refrigeration Fit
Over 85% of cruising sailboats and power yachts use Danfoss/Secop BD35F or BD50F compressors. Verify your manufacturer and spade wiring before claiming your Founder allocation.
1. Which marine refrigeration brand is installed on your boat?
Select your manufacturer below to verify plug-and-play Danfoss / Secop BD35F & BD50F fit:
The 4 Smart Mechanisms That Outperform Legacy Dials & $280+ Modules
Why spend $2,000+ replacing a functioning Danfoss compressor when you can upgrade the outdated mechanical thermostat to military-grade digital control?
1. Active Solar Thermal Battery Engine
Monitors your 12V/24V house battery bus in real-time. When solar arrays push the bus into bulk or float charging (>13.6V), CoolPro™ sub-cools the cabinet using surplus daytime energy. Default sub-cooling floor is +3.0°C to prevent vegetable freezing in standard uncirculated marine iceboxes, and drops safely to +1.5°C when paired with an internal circulation fan.
- ✓Default +3.0°C floor prevents vegetable & produce freezing in uncirculated boxes
- ✓Deep +1.5°C thermal storage when paired with an internal DC circulation fan
- ✓Direct internal DC circulation fan support via standard "F" terminal / 12V aux output
- ✓Throttles to quiet low-RPM idle overnight, cutting 25% to 35% of daily Ah consumption
2. Daylight-Readable Plain-Text OLED
No cryptic LED blink codes, smartphone Bluetooth pairing dropouts, or cloud dependencies while 200 miles offshore. A high-contrast 0.91" daylight OLED displays exact temperatures, RPM, and plain-English diagnostics.
- ✓Real-time voltage sag measurement (e.g. "SAG: Δ2.2V - Check 10AWG Crimp")
- ✓Plain-text compressor stall & anti-short cycle countdown timer
- ✓Direct sunlight readability with zero glare issues
3. Dynamic BLDC Variable-Speed Optimizer
Factory mechanical dials operate Danfoss BD35F compressors at a fixed speed via a static resistor. CoolPro™ dynamically modulates compressor RPM (2,000–3,500 RPM) using closed-loop PID thermal demand algorithms.
- ✓High RPM (3,500) for rapid cabinet pull-down after restocking groceries
- ✓Low RPM (2,000) for ultra-efficient steady-state hold (highest COP efficiency)
- ✓Extends compressor mechanical lifespan by eliminating harsh on/off slamming
4. Physical Analog Bypass & 70V Surge Stopper
Built specifically for bluewater passagemakers. Features an Analog Devices LT4364-1 active electronic surge stopper clamping 70V alternator load dumps, paired with a physical manual toggle switch.
- ✓Physical bypass switch instantly restores basic constant cooling if logic ever fails
- ✓Protects against heavy starter motor inductive kicks and lightning spikes
- ✓Reverse polarity P-FET protection prevents wiring damage
Plug-and-Play Danfoss 101N0210 Spade Schematic
No refrigerant manifold gauges, no wire splicing, no marine technician labor costs. Directly replaces standard bimetallic thermostat dials across all major OEM systems.
Thermostat Spade Terminals (C & T)
On OEM marine fridges (Adler Barbour, Isotherm, etc.), closing the circuit between C and T signals the BD35F brushless motor to run. CoolPro™ plugs directly into these two spades, replacing the sloppy 4°C mechanical dial with micro-precision solid-state switching.
NauticECU CoolPro™ vs. Legacy Alternatives
Compare CoolPro™ against high-cost proprietary marine electronic controllers and standard OEM mechanical thermostats.
| Feature / Capability | NauticECU CoolPro™Best Value $159 Founder Pre-Order ($0 Today) | Isotherm SEC $280+ USD | Mechanical Dial $65 USD |
|---|---|---|---|
| Price Point | $159 Founder ($189 MSRP) | $280 – $340 USD | $65 USD (OEM Dial) |
| Active Solar Thermal Overcooling | Yes (Sub-cools to 1.5°C when Solar >13.6V) | Partial (Basic holding plate logic) | None (Blind fixed mechanical cycle) |
| Daylight OLED Display with Plain Text | Yes (0.91" Daylight OLED 128x32) | None (Requires separate dial/LED) | None (Numbers 1 through 7 dial) |
| Dynamic Variable Speed (PID) | Yes (2,000 – 3,500 RPM Dynamic) | Yes (3-Step stepped resistor) | No (Fixed single resistor speed) |
| Voltage Sag & Wiring Drop Diagnostic | Yes (Calculates ΔV drop under compressor load) | No (Basic undervoltage shutdown) | No (Compressor simply clicks and fails) |
| NMEA 2000 & Signal K Marine Telemetry | Yes (Galvanically isolated CAN port) | No (Closed proprietary system) | No (Completely isolated analog wire) |
| Physical Manual Analog Bypass Switch | Yes (Instant failsafe toggle for bluewater passage) | No (If module fails, cooling stops completely) | No (If dial capillary tube leaks, it is dead) |
| Temperature Precision & Stability | ±0.3°C Digital Dual Probe (No food freezing) | ±1.5°C Air Sensor | ±4.0°C Huge Deadband Drift |
| Alternator Load Dump Surge Protection | LT4364-1 Clamping (Survives 70V spikes) | Basic TVS Diode | None |
| Installation Complexity | 15-Min Plug-and-Play (Spade Terminals) | 30–45 Mins (Sensor drilling required) | OEM Replacement |