SMSCOM SPC MK2 8 Amp Controller · Precise Temperature & Fan Speed Regulator

The SMSCOM SPC MK2 8 Amp Controller is an advanced electronic climate regulator designed to automatically adjust your extraction fans and maintain the perfect temperature in your indoor garden.

Many growers still rely on manual fan switches or basic timers, treating their ventilation as a simple on/off system that blasts at full power regardless of the actual heat inside the room.

This outdated approach leads to massive temperature swings, stressed plants, wasted electricity, and a constant roaring noise that kills your stealth. You end up constantly unzipping your setup to check the thermometer, playing a never-ending guessing game that ultimately hurts your final yield and ruins your peace of mind.

By upgrading to a smart, automated system, you can dial in the exact minimum and maximum fan speeds, letting the controller do the heavy lifting to keep your environment perfectly stable, whether you are running a small setup or a massive room.

The Stealthy Home Grow Tent

When you are growing in standard Grow tents, keeping things quiet and stable is your top priority. You do not want your fans sounding like a jet engine all day and night.

With the SMSCOM SPC MK2, you can set a low minimum fan speed. This ensures constant negative pressure to keep odors contained, while keeping noise to an absolute minimum so you can chill in peace.

If the lights turn on and the heat spikes, the controller smoothly ramps up the fan speed to cool things down, dropping back to a whisper-quiet idle once the target temperature is reached. It is pure stealth and efficiency.

High-Power Multi-Fan Grow Rooms

For those running larger spaces with heavy-duty Air Extraction System setups, managing multiple high-capacity fans can be a logistical nightmare.

This 8 Amp beast can handle a serious load, meaning you can connect powerful extractors without frying the circuits. Plus, it can be linked to an auxiliary module if you need to expand your setup even further.

The included 5-meter NTC temperature sensor allows you to place the probe right at the canopy level, ensuring your plants get the exact Climate Control they need, exactly where they need it.

How to choose the best setup for your grow

Not sure how to configure this controller for your specific space? Here is a quick guide to help you dial it in perfectly:

• If you prioritize stealth: Set a low minimum speed to keep noise down while maintaining negative pressure.
• If you run hot lights: Set a higher maximum speed so the fans can quickly exhaust the intense heat when the lights kick on.
• If you live in a cold climate: Keep the minimum speed very low to prevent over-cooling your plants during the dark cycle.
• If you plan to expand: Take advantage of its 8 Amp capacity and auxiliary module compatibility to scale up without buying a whole new controller.

Unbeatable advantages and benefits for your crop

• Because it features precise electronic temperature control, you can automate your ventilation, which means you save time and eliminate the stress of manual adjustments.
• Because it includes min/max fan speed settings, you can prevent extreme temperature fluctuations, which means your plants experience less stress and produce heavier, healthier yields.
• Because it comes with a 5-meter NTC sensor, you can measure the heat exactly at the plant canopy, which means your climate readings are 100% accurate to what your plants actually feel.
• Because it handles up to 8 Amps, you can connect high-power industrial fans, which means you have the flexibility to upgrade your grow room size without replacing your gear.

Frequently Asked Questions

How do I install the temperature sensor?

Simply plug the 5-meter NTC sensor into the controller and hang the probe tip right at the top of your plant canopy, directly under the lights. This ensures the controller reacts to the actual heat your plants are experiencing.

Can I connect two fans to this controller?

Yes, as long as the combined amperage of both fans does not exceed the 8 Amp limit of the SMSCOM SPC MK2. For most standard inline fans, 8 Amps is more than enough capacity.

What happens if there is a power surge?

The controller is equipped with a built-in fuse to protect its internal circuitry. It even comes with a spare fuse included in the box, so you can get back up and running immediately if a surge occurs.

Personal Experience of Pevgrow’s CEO (Alan)

I have tested countless climate regulators over the years, and the SMSCOM SPC MK2 8 Amp is easily one of the most reliable workhorses I have had in my grow rooms. I personally use it in my mid-sized setups where I need absolute stability without the headache of complex programming. What I love most is the smooth transition between fan speeds—there is no aggressive clicking or sudden roaring that you get with cheaper controllers. I always recommend setting the minimum speed just high enough to keep a gentle breeze and negative pressure; it keeps the smell locked in and the plants breathing perfectly. The fact that it comes with a 5-meter probe is a lifesaver, letting me pinpoint the exact canopy temp. If you want a plug-and-play solution that just works and protects your crop day and night, this is the one.