The Mission: Quiet Power and Reclaimed Garage Space
It was time for an eviction notice. The old noisy monster was getting kicked out of the garage, and its modern replacement was getting a custom-built home. It was the ultimate win-win for our home and garage organization.
This project was all about achieving peace and quiet while ensuring we had reliable backup power. We also wanted to get that bulky machine out of the way of daily life.
If you’re thinking about a similar garage upgrade, we documented the entire shed-building process. You can find the complete guide here: Moving the Generator to a Shed.
This project required a few key components to get right. Here is the essential gear we used for our generator and shed project.
- Firman Dual Fuel Portable Generator
- Filter Grille (for letting air in and out)
- Exhaust Fan (to help it breathe)
- Mass Load Vinyl (the serious stuff for soundproofing)
- Rockwool Mineral Wool (another good sound blocker)
Our project foreman was on-site to ensure all work was up to snuff. As you can see, he was much more relaxed about this new setup.
Why We Chose Our New Champion: The Firman H08051
After much research, we landed on the Firman H08051. It’s a powerful dual-fuel model that features a user-friendly electric start button.
Of course, it still has a traditional pull-start. This provides a reliable backup just in case you forget to charge the battery for the fancy button.
At a rated 74 decibels, it’s a world away from our old machine. It’s about as loud as a household vacuum cleaner, which is a massive improvement.
It’s not completely silent, but it doesn’t make the windows rattle, either. Our dog gives this much quieter operation two paws up.
For a deeper dive into choosing the right generator for your needs, we highly recommend this excellent buying guide from Consumer Reports. It can help you navigate the various features and power requirements.
What Can This Generator Actually Run?
With 8,000 running watts on gasoline, this thing is an absolute workhorse. It was a huge step up for us in terms of capacity and convenience.
We can now run the well pump, the dishwasher, the microwave, and the fridge all at the same time. There are no more strategic shutdowns or “power rationing” conversations during an outage.
We can simply live our lives as normal, just on generator power. While we aren’t trying to light up the house like a casino, it perfectly handles the load for modern life.
Of course, your power needs may vary. It’s always a good idea to add up the wattage of your essential appliances to find the right size generator for you. The National Fire Protection Association offers great advice on generator safety and load planning.
The included 25-foot power cord is heavy-duty and long enough to safely connect from the outdoor shed to our home’s transfer switch.
The Dual-Fuel Advantage: Gas and Propane Offer Peace of Mind
The beauty of a dual-fuel generator is having options. This model runs on either standard gasoline or propane, which is a fantastic feature for emergency preparedness.
During a major storm or extended outage, you never know what fuel might become hard to find. If there’s a run on gas stations, no problem; you’ve got propane tanks ready to go.
It’s important to know that running on propane provides slightly less power. This model drops to about 7,250 running watts, but the convenience is unbeatable.
Switching between fuels on the Firman is simple: turn the motor off, flip a switch, and turn it back on. There’s even a smart lock so you can’t accidentally switch it while it’s running.
All-Night Power: How Long Will the Generator Run?
On a full 8-gallon tank of gasoline, the Firman will run for about 12 hours at a 50% load. This is a key feature for convenience and safety.
That long runtime is more than enough to get you through the night. You won’t have to go out in your pajamas in the middle of a storm to refuel.
The big question for many is how long it runs on a propane tank. While it depends on factors like load and temperature, you can generally expect a standard 20-lb propane tank to last between 6 and 10 hours at a 50% load.
Planning for fuel is a critical part of being prepared.
My Favorite Feature: The Magic of the Electric Start
I admit, I have a long and unsuccessful history with pull-starts. So, the simple push-button start on this generator feels like pure luxury.
Just one push and the generator roars (or purrs, compared to the old one) to life. It’s a small detail that makes a huge difference in a stressful situation.
The key to this convenience is remembering to perform a little monthly maintenance. You should start the generator once a month and let it run for about 30 minutes to keep that little battery charged.
If you forget, you’ll have to face the dreaded pull-start cord after all. But having it as a backup is still great peace of mind.
Designing the Perfect Home for Your Generator
Moving the generator out of the garage was the second major part of our project. It freed up floor space, reduced noise inside the house, and improved safety.
We found a pre-built box on Craigslist and modified it to suit our needs. You can also build one from scratch using various plans available online.
Our main goals for the shed were simple but crucial. We needed to allow for plenty of air movement, keep the weather out, and muffle the sound as much as possible.
A dedicated shed is the best way to house a portable generator. It protects your investment from the elements and keeps it ready to go at a moment’s notice.
Creating this small but effective structure turned a simple appliance into a permanent, integrated part of our home’s emergency plan.
How Do You Safely Ventilate a Generator Shed?
This is the most important part of any generator shed build. Generators get extremely hot and produce deadly, odorless carbon monoxide gas, so proper airflow is non-negotiable.
You must never, under any circumstances, operate a generator in a garage, basement, or any enclosed space. A generator shed must be properly ventilated to prevent engine overheating and dangerous gas buildup.
Our box came with a louvered vent, which was a great start. If you’re building from scratch, adding a simple grille cover over an intake opening is an easy and effective solution.
We also kept an exhaust fan on standby in case things got too toasty, though so far, passive venting has worked just fine.
Proper airflow for intake and exhaust is essential for both safety and the longevity of your generator’s engine.
Soundproofing Secrets: How to Tame the Generator’s Roar
I went down a deep rabbit hole researching soundproofing materials. It turns out that sound waves are tricky, and blocking them effectively requires specific materials.
The gold standard for blocking sound in a small space like a generator shed is Mass Loaded Vinyl (MLV). It’s a heavy, dense rubber that is incredibly effective at stopping sound transmission.
Another solid, pro-recommended choice is Rockwool mineral wool insulation, which is great for both sound and heat. You can learn more from this guide to building a generator enclosure.
Full disclosure: we ended up with regular batt insulation because it was more budget-friendly. However, after we cut all the pieces, we realized they took up too much space and we couldn’t fit the generator comfortably.
We never actually installed the insulation. The new generator is so much quieter than our old one that we decided we could live with it. Sometimes “good enough” is the perfect solution!
A word of caution if you do use batt insulation: that stuff is fiberglass. Working with it is like cuddling with angry, invisible cacti. Please wear gloves, long sleeves, and safety glasses.
Five Years Later: Our Long-Term Review
After five years of ownership and several power outages, we still love it. There are absolutely no regrets about this purchase or the project.
The dual-fuel flexibility provides ultimate peace of mind. The quieter operation is still a blessing for our ears and our dog’s nerves. The long runtime means we can sleep through the night without worrying about refueling.
And that magic electric start button? It still feels like a luxury every single time. Most importantly, it runs our house without any drama, turning a stressful outage into a minor inconvenience.
A pro tip on buying: this generator is heavy. We bought ours through Amazon with a Prime membership, so the freight shipping and “lift gate service” were included. Using the Amazon Prime credit card also gave us 5% back, saving us a bit of cash on a big purchase.
Your Complete Project Kit: Recommended Generator and Shed Components
Are you ready to reclaim your garage space and get fully prepared for the next power outage? Investing in a quality generator and a proper shed is one of the best upgrades you can make for your home.
This project not only improves your quality of life during an emergency but also cleans up your garage, making it a safer and more usable space every day.
Here is the complete list of the products we recommend, along with some helpful resources to get you started on your own generator shed project.
For building your shed, you don’t have to start from scratch. Check out these free generator shed plans to get some great ideas and layouts.
If you’re a visual learner, this generator shed build video is a fantastic reference to see how all the components come together.
