Power for a tent event is the part of the plan most hosts leave for setup day, and it is the part most likely to go dark in the middle of the party. The lights get hung, the DJ plugs in, the caterer plugs in, and at seven o’clock a breaker trips in a basement that nobody can find. Nothing was broken, because too many things were simply sharing one household circuit.
This guide shows how to add up what your event will draw, what a house can really supply, and when a generator is the better answer. It works the same way for a backyard birthday, a graduation party, a company picnic, a church festival or a wedding. We are Dreamers Event Rentals, and we set up tents across the greater Baltimore area and the rest of Maryland. Every number below that describes our equipment comes straight from our own rental records, not from a rule of thumb. Under our rental agreement the renter supplies the power for every item that needs it, which makes this your list to build, although we will gladly help you build it.
📋 In This Guide
- How Much Power for a Tent Event? Start With a List
- What Each Rental Item Actually Draws
- Why Two Outlets Can Still Be One Circuit
- When Power for a Tent Event Means a Generator
- Where the Generator Goes
- Extension Cords: The Part Nobody Orders
- A Power Checklist to Finish Two Weeks Out
- Frequently Asked Questions
How Much Power for a Tent Event? Start With a List
The honest answer is that it depends on what you plug in, because the tent itself needs no power at all. A daytime party with tables and chairs can run on nothing, while an evening event with heat, lights, music and hot food can quickly outgrow what a house supplies.
So start with a list of every item that has a plug, including the lighting, the heaters or fans, the sound system, the restroom trailer, and whatever the caterer and the band are bringing. Next to each one, write what it draws, in either watts or amps.
The two units convert easily, since watts equal volts times amps and a household outlet supplies 120 volts. That means one amp is about 120 watts, and a 5 amp heater blower is a 600 watt load.
Then add it up the way the generator manufacturers recommend. Honda’s wattage estimation guide says to total the running watts of everything that will be on at the same time, and then add the single highest starting number rather than all of them. That total is the figure the rest of this guide works from.
The season also changes the list, because a Maryland party in June may add fans or a cooling unit, while from October on, heat joins the order. Our guide to how late in the year you can hold a tent event covers what the cold months add.
What Each Rental Item Actually Draws
Here is what the powered items in our own inventory need, taken from the requirements listed on each rental record.
| Rental item | What it needs |
|---|---|
| 80,000 BTU propane tent heater | A standard 120 volt outlet. 5 amps to start, 1.5 amps running |
| 170,000 BTU propane tent heater | A standard 120 volt outlet. 7.3 amps to start, 5 amps running |
| 20 kW electric tent heater | A 240 volt, 48 amp, 3-phase supply |
| Tent fan (24 inch drum fan) | A standard 120 volt outlet |
| Portable evaporative cooling unit | An outlet, plus water from a fill or a hose |
| Bistro lighting | An outlet. Extension cord not included |
| Professional sound system | An outlet |
| HD projector | An outlet |
| Restroom trailer (3 or 4 station) | Two standard outlets |
Two things in that table surprise people. The first is how little the propane heaters draw, because the propane makes the heat and the outlet only runs the blower and the thermostat. Even our largest propane unit settles at 5 amps once it is running, and if you are still choosing a heater, our guide on how to heat a party tent covers sizing.
The second is the electric heater, which is a different animal. A 240 volt, 3-phase supply is a commercial building service, so it suits a venue with heavy power on site and almost never a home.
What the table cannot tell you is what your vendors will plug in, and that is usually the bigger half of the list. Ask the caterer, the DJ or band, and the photo booth for their power needs in writing. As a rule, anything that makes heat with electricity draws far more than anything that makes light or sound. That is why an electric coffee urn or food warmer deserves more attention than a speaker.
Why Two Outlets Can Still Be One Circuit
Most hosts count outlets, but the number that matters is circuits. A house is wired in circuits, each one protected by its own breaker, and several outlets usually share a single circuit. The two outlets on your garage wall and the one on the back porch may all lead to the same breaker.
A typical household circuit is rated at 15 or 20 amps. At 120 volts, a 15 amp circuit tops out at 1,800 watts and a 20 amp circuit at 2,400 watts. That is the ceiling for everything on that breaker combined, including the garage refrigerator that was already running before the party started.
Mapping your circuits takes a few minutes, and it is worth doing a week or two ahead. Plug a lamp or a radio into each outdoor and garage outlet, switch off one breaker at a time, note which outlets go dead together, and read the amp rating printed on each breaker handle.
Then give each big load its own circuit, with the heaters on one, the DJ on another, and the caterer on a third, so that no single breaker carries the whole party. Watch the starting numbers too, because a heater that runs at 5 amps asks for 7.3 amps in the moment it starts. That brief spike is what trips a circuit that was already close to full.
The Electrical Safety Foundation gives the same advice in its outdoor electrical safety booklet: add up the total wattage on a circuit before you plug in. It also recommends cords rated for outdoor use and outlets with ground fault protection.
When Power for a Tent Event Means a Generator
A generator is the answer in three situations. The first is a site with no outlet in reach, such as a field, a park, a parking lot, or the far corner of a large property. The second is a list that adds up to more than the circuits you can spare, and the third is a vendor who asks for dedicated power, which bands and caterers often do.
We rent two quiet generators. The smaller one puts out 2,000 watts, or 16.7 amps at 120 volts, which is close to one household circuit that you can set down anywhere. It is our entry-level unit, and it suits a pair of propane heaters or a simple lighting and music setup.
The larger one is rated at 3,500 starting watts and 3,000 running watts. It has two standard 120 volt outlets and one 30 amp twist lock outlet, and it runs about 11 hours at a quarter load. It also arrives with a full tank of gas, and it is rated at 56 decibels, which is why it carries the word quiet in its name.
Here is how that plays out with real numbers. Two of our 170,000 BTU heaters run at 10 amps together and could ask for 14.6 amps if both started at once, which fits inside the smaller generator with little to spare. Add lighting and a sound system and you have moved up to the larger unit, which has room for all three.
Some events outgrow both, especially a row of food vendors or a full band with a caterer cooking on site. For those we arrange larger subcontracted units, which are quoted with the rest of the order. Tell us what is on your list and request a quote, and we will match the generator to it.
Where the Generator Goes
Placement is a safety decision first and a noise decision second. The Consumer Product Safety Commission says a portable generator belongs outside only, at least 20 feet from the house, with the exhaust pointed away from it. It should never run in a garage, a shed, or any enclosed space.
Treat the tent the same way, because a tent with its sidewalls on is an enclosed space full of people. The generator stays well away from it, with the exhaust pointed away from the walls. Our larger generator shuts itself off when it detects harmful levels of carbon monoxide, but that feature is a backstop, not a plan.
After safety, pick a spot away from where guests will sit and talk, and out of the path between the tent, the house, and the parking. Choose it before setup day, because the location decides how much cord the event needs.
Extension Cords: The Part Nobody Orders
Extension cords are not included with our heaters or our bistro lighting, and it says so on each item. It still gets missed, so decide early whether you will supply your own cords or ask us to add them to your quote at the length you need.
Measure the run the way the cord will really travel, which means along the fence line or the garden bed rather than straight across the lawn where guests will walk. Then add the distance from the tent edge to wherever the item will sit.
Use heavy cords rated for outdoor use, each one rated to carry at least the total load plugged into it, and remember that a longer run calls for a heavier cord. You can see the powered items we carry, from lighting to heaters and generators, in our tent accessories.
A Power Checklist to Finish Two Weeks Out
Power problems are simple to fix two weeks ahead and nearly impossible to fix at seven o’clock on the night, so work through these four steps in order.
1. List every item with a plug. Include the rentals and everything your vendors are bringing, note which ones run at the same time, and get each vendor’s numbers in writing.
2. Map your circuits and assign the loads. Find out which outlets share a breaker, then give each big item a circuit and keep every total under its ceiling, with room for the starting spike.
3. Measure the cord runs. Follow the real path, write down each length, and decide who is supplying the cords.
4. Fill the gap with a generator. If the list does not fit the house, or there is no house, add a generator and choose its spot.
Send us the list when you get a quote, and we will check it against the equipment on your order, including any audio and video rentals.
Frequently Asked Questions
Do I need a generator for a tent event?
You need a generator only when there is no usable power near the tent, or when your list adds up to more than the circuits you can spare. Many backyard events run on household outlets once the big loads are spread across separate circuits. If the site is a field, a park or a parking lot, plan on a generator from the start, which is exactly the case we rent them for.
What size generator do I need for a tent party?
The right size is the running watts of everything on at once, plus the highest single starting number on your list. Our 2,000 watt unit covers a couple of propane heaters or basic lights and music, while our larger unit supplies 3,000 running watts for heat, lighting and sound together. Bigger loads, such as a caterer cooking on site, call for a larger unit that we arrange for you.
How far does a generator need to be from the tent?
Keep a generator at least 20 feet from the house, which is the distance the Consumer Product Safety Commission gives, and treat a walled tent the same way. Point the exhaust away from the tent and from any doors or windows, and never run one inside a garage, a shed or the tent itself.
What is the difference between running watts and starting watts?
Running watts are what an item draws while it is working, and starting watts are the brief extra burst it needs to switch on. Our 170,000 BTU heater, for example, needs 7.3 amps to start and 5 amps to run, and a circuit or a generator has to handle the starting number even though it lasts only a moment.
Let Us Check Your Power Plan
Send us the date, the guest count, where the tent will stand, and what you plan to plug in. We will tell you what each rental item needs, whether your outlets can carry it, and which generator fits if they cannot. Get a quote here, or browse our tent inventory.