Ultimate USAutomatic 020320 Sentry 300 Commercial Grade Automatic Gate Opener Review

Today we will present you the ultimate or better said complete USAutomatic 020320 Sentry 300 Commercial Grade Automatic Gate Opener review. This model has been with us for quite some time and it is considered as one of the best and the most desirable models made by this brand. There are a lot of things you will know about this particular model and all of them will be mentioned and explained in the content below.

At the moment all we can say is that US Automatic Sentry 300 S is suitable for gates up to 20 feet in length and powered by solar power (optional) or AC charger. The unit can be installed on single and dual leaf gates. The opening time is 16 seconds.

About US Automatic

Some of you may believe that this isn’t a popular brand. On the contrary, they are a very desirable gate opener manufacturer and they have been with us since 1994. As the name suggests the company is located in the United States and they have been making all kinds of gate openers and many other products.

This brand is also very appealing when it comes to the quality and the price. Their models are extremely well-made, come with all the essentials you are going to need and so much more. An interesting fact is that they were the first company to develop gate openers powered solely by solar power.

Main features:

  • Reverse and stop feature that will detect an obstacle and apply countermeasure.
  • 3 years warranty.
  • When paired with solar panel homeowners can get a 30% tax deduction.
  • Very fast operations at all times.
  • Suitable for gates up to 20 feet in length.
  • Can be used on single and dual leaf gates (the different version is required).
  • Circuit board is completely sealed and isolated.
  • Can be operated using solar power only.
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  • Excellent customer support.
  • Great tax deduction.
  • Easy to install and maintain.
  • Fast operation.
  • Stop and reverse system.


  • Loud while operating.
  • The battery isn’t included in the package.

Homeowners who will benefit the most from US Automatic Sentry 300 S

There are a few homeowner types that will benefit the most from this gate opener. We believe that they are the biggest part of the owners and they will consider this particular model as the best and the most desirable choice available on the market. If you are one of them you will be impressed with the model in questions.

  • Homeowners who like DIY projects and want to install a gate opener all by themselves will love the tested unit.
  • Those of you who need a fast and reliable gate opener and who are in the rush all the time will benefit as well.
  • People looking for a great deal and an affordable gate opener will be impressed and completely satisfied with the choice.
  • Let’s not forget that homeowners who need a solar powered unit and want to get tax deduction will love the choice as well.

Technology implemented into US Automatic Sentry 300 S Gate Opener

There are a few technologies we simply must explain additionally and help you understand their importance. All of them are desirable and appealing choice you will want on any gate opener.

Circuit board is completely sealed

One of the interesting features is the circuit board that is completely sealed. It is located in a plastic housing and the edges are coated with silicone to make sure insects and water can’t get into the case. There are two main reasons for this. The first one is the water can’t get in and damage the components. The second reason is insects won’t be able to make housing their home, which also prevents possible risks from damage.

30% tax deduction thanks to low energy consumption

We did mention this advantage several times and it is because we believe it is one of the most appealing and desirable parts about the gate opener in question. The unit uses as low energy as possible and can be powered solely using a solar panel. It is paired with a 12V battery which can get power from solar panel or AC adapter.

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Keep in mind that the solar panel kit is available as optional extra and it includes a new battery and the solar panel itself.

Fast operations

The gate opener is one of the most stunning models when it comes to the overall speed. You can open or close any gate, regardless of the material and weight in 16 seconds. This is a game changer for most of you and should help you understand why this particular model is special.

Stop and reverse system

Yes the US Automatic Sentry 300 S comes with stop and reverse feature. What this means is that in a case an obstacle is detected the system will stop closing the gate and it will open it. This system decreases the risk of possible damage or injury and it is very appealing on all high-end models.

Available accessories

You can get literally anything to add to the system. For instance, you can add the wireless keypad, eye scanner, remote controllers and even exit sensor. The solar power kit is obviously available and ready.

Alternative gate openers

In the United States, there are 2 main gate opener manufacturers. The first one is Mighty Mule and the second is US Automatic. Both of them have been providing excellent gate openers for years or even decades and they are known for reliability, customer support, and the overall quality.

The US Automatic makes gate openers which are slightly better made than Mighty Mule, but the second brand here offers more affordable models. It is up to you to decide which choice you want to make and why. We stand by you and we will always help you be completely satisfied with the choice you make.

Don’t forget that LiftMaster is an option as well. Their gate openers are very desirable ta the moment and they come with all kinds of features and safety systems.

Additional notes you will need to know

Here is a list of points that deserve your attention as well. They are additional information you will want to know regarding the US Automatic Sentry 300 S.

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The package comes in a massive case which includes gate opener arm, remote controllers, mounting hardware, control board, circuit board, and 50 feet cable. The user manual is present as well. All of this is packed in a box with 29.1” x 9.6” x 24.1” dimensions and weight of 34 pounds.

You can purchase the model from Amazon and you will get 3 years long warranty.  The model you order will be shipped to your address within 2 business days. The shipping is reasonably fast and there are no issues you need to know about.

The model is made for gates up to 20 feet in length and weight of up to 800 pounds. You can use it with a single leaf or dual leaf models and you can install it within minutes.

In the package, you don’t get a battery but it is required to operate. You may have one at home or you will need to order it as well. The battery is primarily charged using 12 V AC adapter but can be paired with a solar panel. It is also available separately and it comes as an option only. Other options you can install are wireless keypads, eye photo, exit sensor, and gate locks.

The remote controllers use CR123 batteries. The main issue here is its availability. They are not easy to find so you will probably need a bit more time to get a suitable set of replacement batteries. It is always a nice addition having a few of them at your home, just in case.

The final word

The US Automatic Sentry 300 S is an excellent gate opener that comes at a low price, offers sped you will need and durability we all like. It is simply one of the best models out there and it deserves your full attention. We gave it 5 out of 5 stars which is the highest rating we ever gave to a gate opener.