The new Milwaukee Roll-On power supply, 3300R, is a versatile portable power station with a built-in non-removable rechargeable battery.
It features a 2.5 kWh battery, pure sine wave inverter, (4) 20A GFCI-protected outlets (2x duplex), USB-A and USB-C charging ports, IP54 dust and water resistance rating, One-Key compatibility for tracking, high-visibility display, telescoping handle, and pass-through power.
The Milwaukee 3300R Roll-On power station charges to 25% in 35 minutes, and 100% in 3 hours.
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It can deliver 3600W running power, and 7200W starting power.
The Roll-On is – true to its name – designed to be rolled onto jobsites. It features 9.5″ all-terrain wheels and is said to withstand jobsite environments, such as gravel, dirt, and mud.
I’m sure you’ve noticed the Packout-compatible top plate, which lets users haul a bunch of gear to the worksite in fewer trips.
It’s unsurprising that Milwaukee showcases the Roll-On with Packout-compatible M18 battery chargers, as it seems especially well-suited for this purpose.
The Milwaukee Roll-On can be used to power corded tools, in a similar manner as a gas generator, or as a mobile battery bank for recharging cordless power tool batteries.
This could be advantageous for cordless outdoor power tool users who need to recharge their batteries throughout the day.
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Milwaukee’s product imagery depicts the Roll-On being used in mixed environments, where it’s powering corded tools and charging batteries at the same time.
The Roll-On doesn’t give off any emissions, allowing it to be used in environments unsuited for gas engine generators.
With the 3600W continuous power rating, it can support (2) 15A tools being used at the same time.
The outlets are rated to 20A, and can be used for more power-hungry tools.
Milwaukee’s images show the Roll-On being used in a wide range of usage environments.
There are USB-A and USB-C charging ports, as well as a convenient compartment where you can stow your smartphone or similar device while charging.
Features & Specs
- 2.5 kWh battery
- 3600W continuous, 7200W starting power
- (2) 20A duplex outlets (4 ports total)
- GFCI-protected pure sine wave AC output
- Display is visible from up to 25 feet away
- Telescoping handle
- Roll cage design
- 9.5″ all-terrain wheels
- Charges to 25% in 35 minutes
- Charges to 100% in 3 hours
- One-Key-compatible for tracking & management
- Pass-thru power (simultaneous charge & discharge)
- Packout-compatible top-plate
- IP54 rating
- 23.15″ W x 28.85″ L x 19.95″ H
- Weighs 104 lbs
An optional dust cover (48-11-3300) is available separately.
Price: $4499
ETA: April 2024
Runtime Estimates
Runtime estimates will change depending on the tool, appliance, or load. Following are some usage examples and estimates provided by Milwaukee.
- M18 5Ah battery: 20x recharges
- Pipe threader (1800W): (161) 2″ threads
- Portable air compressor (2000W): drives 3,854 framing nails
- Framing circular saw (1300-1500W): 4,117 OSB cuts
- Fluid transfer pump (100W): 12,506 gallons
- Microwave (100W): 76 meals heated
- TV (50-200W): 600-2400 minutes
- Laptop (90W): 35 recharges
Milwaukee Roll-On Questions & Answers
What is the working temperature range?
The operating temperature for the ROLL-ON Power Supply is -4F to 122F.
Is the power station UL-rated?
Yes, it is UL-rated!
We’re working on getting answers to a couple more questions. Let us know what other questions you might have!
Geoff
This thing is pretty awesome! But not for $4500! 2.5kwh is a 12v 200ah lifepo4 battery which you can buy for $570. And even a victron charger/inverter is only $1200! You can buy a lot of pack out boxes for the price difference!
Jared
I knew it was going to be expensive as I read the article, but the price still caught me a bit off-guard.
Nevertheless, as a concept? This looks great. It packs a lot of power and capacity and looks like it would integrate well into the Milwaukee system.
S
Isn’t a victron unit quite a bit larger?
I mean, it’s pretty easy to undercut new products on raw features, but it’s always the packaging and features creap that grows the difficulty of things.
Just look at vehicles. I can easily hook up a predator HF motor to a bike gearbox, and on a basic ladder frame between 4 tires with some brakes off a trailer for under $3,000.
Does that mean Toyota/Chevy/Ford/etc are intentionally ripping us off for offering vehicles at $40,000?
Geoff
The victron unit is 14x10x9, and it’s very high end. Nothing like the HF comparison.
Yes, the car manufacturers are ripping us off. I looked up Ford and they made $24bil in profit in 2023. In addition, they also took a very low interest loan in the amount of $9.3bil. They also receive loads of subsidies in the form of tax breaks. Now I get to pay for part of your crappy made in Mexico truck. On the other hand, I have a Toyota. Made in the USA, and they get their subsidies from the Japanese government!
Ray
I guess you’re saying you like your Toyota, or Toyota is pricing their trucks too high because Japan is subsidizing them? BTW, Toyota trucks have come a long way, they have almost look like real trucks.
Josh H
I agree that it is pretty expensive, but the MW unit looks like it’s a business product rather than a DIYer or homeowner’s product.
I’ve installed a few Victron units (Multiplus line), and it was super interesting to learn how they work. But it’s not plug and play like the MW unit is. You have to buy the wires, outlets, batteries, lugs, enclosure, breakers/fuses, and do install all of those components yourself. You also have to make sure everything is wired up correctly (not difficult, but it takes time). I think it’s worth doing if you’re a DIYer and want a portable power source, it’d be a fun weekend project!
I’m not sure a business would want to do all of that however. You have a huge opportunity cost where your employee could be making you money, which makes the cost difference almost moot. That, and double checking that you’re not violating some OSHA regulation makes the time it takes to build that system not worth it in my opinion.
So for a DIYer? $4500 is absurd. For a business? Pretty reasonable.
Nick
I agree for a Diyer/homeowner (which I am both) it’s pretty steep in price. Curious do they have something similar for us Diyer’s? That’s more reasonable in price?
CA
Holy underwear gentlemen! We would lose our phony baloney jobs if we paid that much for a generator that stacks stuff on top of it. My boss would never buy it…….then again maybe he would….he loves red toys!
Dave
Build that into one job and its paid for….
Commerical jobs aren’t $3k bids, they’re hundreds of thousands or millions. This is pennies to them.
Saulac
Built in charger? Are the batteries replacable? Can we not calling these generators?
Hon Cho
Ditto, battery packs are NOT generators!
Few reasons to consider these type of devices just yet. Perhaps in a few more years as regulations tighten availability of ICE generators or the price of hydrocarbon fuels jumps enough to make the price premium for battery backs more palatable.
Geoff
The main appealing thing about my proposed setup with a diy solution is that you can hook up less than $400 worth of solar panels and charge controller to your truck and keep the battery topped off for at least the next 15 years! But we are still looking at half their price all in with the ability to connect to the components with apps for monitoring. Oh, you can also use my solution in sub freezing temps with a small upgrade to the battery by getting the battery with the internal heating pad.
JoeM
Very nice! Looks robust, power specs are nice, Add in that it’s Packout-Ready? Well done Milwaukee!
eddie sky
Solar cell ability for charging outdoors?
Jim Felt
I’m glad Milwaukee is pushing the limits of conventional jobsite thought possibilities. And based on at least some serious niche market research they’ll likely sell a few and learn a ton.
Good to see innovation in this space.
(And they thought of USB C. Wonder what the output is)?
MFC
Yeah, the most telling thing about this is that it can recharge twenty 5ah batteries. That’s 1800 watts. So, is the transfer loss really 28%? That seems pretty high if it’s just DC-DC. Or do they keep the internal batteries from discharging completely?
Stuart
It could be a conservative estimate, but I wouldn’t assume so.
Chargers – especially faster ones – put out a bit of heat, which reflects efficiency losses.
You’re converting DC to AC by the power supply, and then AC to DC by the battery charger.
MFC
Oh right, I guess that’s about correct then. They estimate between 5-15% loss from A/C to D/C and vice versa.
S
I really wish they would start doing dc chargers for options like this. The dc-ac-dc conversion process has a lot of waste
Lance
Stuart, explaining the efficiency losses is great and all, but it doesn’t change the reality of the situation – that’s a buttload of cash that could buy way more 5Ah batteries and a Packout case to transport them.
This thing is a ruggedized battery inverter for 3x the price of other inverters and less features. Milwaukee cashing in big time margins on this one.
Stuart
You can get 50 chicken nugget strips for the same price as 1 steak. But no matter how you justify things, chicken nuggets are not the same as steak.
The Roll-On is specialty equipment for specific needs.
It’s expensive.
I’m not focusing on the price because I figure 99% of the pros buying this aren’t spending their own money.
What do potential margins have to do with answering a reader’s specific question about transfer losses?
Lance
Thinking more, you could buy 40 5Ah batteries, a Packout rolling box and a couple Topoff inverters for that money. The only thing that setup won’t do is power big AC tools.
According to the first picture it can only power competitors grey AC tools anyway, lol.
Dave
Without doing any math I find it interesting that it can microwave 76 meals but only charge a 5.0 battery 20 times. Seems to also imply that a single 5.0 battery could (in theory) microwave almost 4 meals. 🤔
Mac
Many times manufacturers consider a microwave meal @>=90sec runtime. Makita makes a tiny battery powered easy-bake-oven…
I really dislike ‘meals’ as a unit of measurement, as it is very misleading. Runtime using real units, like minutes, wouldn’t look impressive though. <2hr on full charge. Maybe an hour total with a larger microwave.
The 1000w microwave specified, although in theory it has enough juice for a real size, would need more time than better units and microwaves don't make real food anyway.
Mike McFalls
First to market has a premium but $4,500 is a lot. Also, the cover is sold separately… for a $4,500 tool. If this were some other “teal” or “green” tool there would be a whole lot of forthcoming additional commentary about the pricing and what it can’t do.
Stuart
It’s not exactly first to market.
Bosch launched a similar concept in late-2015 in Europe: https://14cyiuhvcgv.com/bosch-mobile-power-unit-battery-bank/%3C/a%3E%3C/p%3E
Mike McFalls
Thanks, I had no idea Bosch developed this.
Stuart
To be fair, it was announced over 8 years ago and to my knowledge never launched in the USA.
Dave
The more I think about this, the more annoyed I get.
Why not just buy 20 additional 5.0 batteries? Seems a lot cheaper.
That photo with the two packout chargers loaded up with 12.0 and 8.0 batteries? That’s it; charge those and this thing is done. No thanks.
Robert
Milwaukee sure took a lot of photos of this thing. To me another indicator they are very motivated to push sales of it for it’s high profit margin.
Stuart
They take a lot of product photos of most products, presumably to showcase varied capabilities and application examples.
Application photos are an easy way to answer the question “where might this be useful?”
Adam
Definitely pricy, but I can see being able to use it indoors being a huge benefit for certain types of work.
Doug N
Agree with others who point out that if typical usage is to charge M18 batteries, better to buy twelve 12.0s (about $3000 total) since the total kw-hours is equivalent.
Maybe interested if this and the M18 chargers could accept DC-DC charging, to increase speed and reduce losses. That will probably be the next update in a few years.
Mitherial
I am glad to see one of the major tool brands entering this space (and doing so in a way that looks thoughtfully integrated, not hacked together). There are all kinds of reasons to have off-grid power, without having to mess with a gas generator.
As others have said, the main drawback is price. This unit is 2,500 WH for a list price of $4,500 — while Eco Flow (various options) or Goal Zero (Yeti 6000x) will sell you a broadly similar unit with 6,000WH for $3,000: https://www.goalzero.com/products/goal-zero-yeti-6000x-portable-power-station
Now, the MW unit has a few things going for it:
(1) It has a Packout top.
(2) It looks to be more considerably more durable than other options–in person, Eco Flow’s units feel more “solid” than Goal Zero, but neither are designed for anything approaching regular mobile jobsite use.
(3) The exact current draw specs and number/type of plugs may be better or worse than these options–I have not compared.
Point 1 really is a nice plus for something you have to wheel about anyway, but not worth thousands of dollars.
Point 2 may actually be worth paying for in outdoor / construction use cases as there is no point in a power station that gets fried when it starts drizzling.
Point 3 – to be analyzed, but a harder case for being worth a $3,000 (?) price premium.
Stuart
Are any of those brands UL or other NRTL-rated?
Consumer products are designed for occasional use during power outages or for recreational activities, while the Roll-On was designed for daily use in varied jobsite and work environments.
How much does a household vacuum cost vs one with similar performance specs that’s designed for use in food service or hospitality environments?
There’s also the matter that a commercial construction company is not going to equip their crews with consumer products that won’t pass OSHA guidelines.
MM
Ecoflows are UL rated, I don’t know about the others.
Mitherial
Fair points, especially on how not being OSHA compliant limits construction team use. (Though I can definitely see smaller or one-person shops using all kinds of equipment).
Mac
OSHA has fairly simple guidelines for generators. Non-listed units, or custom (re)built units need local approval for use but shouldn’t be denied unless very hacky. Grounding/bonding based on whether it’s independent or connected to an established electrical system.
I’ve yet to see many builders switch from gas gennies though. Takes a lot of fuel to be worth $4500. ~20 Amp hours @ 120v is also definitely not all day use under load.
Dave
Milwaukee is a professional-duty brand, not some consumer amazon brand. They need to design products that will be heavily abused daily so are constructed and tested as such.
Mitherial
One more comment, slightly more controversial: the best single-number metric for power stations is Watt Hours (or Kilowatt-hours), and THEN maximum continuous draw / momentary draw. In practice, based on the nature of battery technology, these numbers are usually proportionally correlated with each other (the bigger KWh units can take more draw without overheating, etc). As in other domains, manufacturers push the specs that sound the most impressive (i.e. momentary draw), but it seriously confuses the picture.
Of course, your power station needs to be rated for the power draw of your corded power tool (etc) that you are using–but as with handheld tools, you usually need *both* runtime and current draw, and larger reserve lithium-family batteries can (almost always) be discharged at a higher rate.
Nathan
Innovative would have been a DC to DC battery charger option otherwise it’s just another battery like a jackery with a pack out frame
Oh and add in a solar port.
Neat but not necessary
Josh H
For that price, I would expect the dust cover to come included!
But speaking more on the price, it’s not all that bad when you average it out over the first 3 years of use. Depending on where you are at, it’s easy to use $10 of fuel per day on a gas generator at a jobsite. If it’s used 200 days per year for 3 years, that’s $6000 dollars just in fuel costs. The cost of electricity on the other hand (assuming you use 2 kw hr every day), would be about $240 at $0.2/kwhr.
Beyond jobsites, I could see this being fantastic for food trucks, it’s a way better customer experience when you don’t have to yell over a generator and smell gas fumes when you eat.
Mitherial
Good point about Food trucks. I doubt that this MW unit would really be big enough for running an electric range for an entire shift by itself, but assuming a separate propane range, it could definitely power auxilliarly lights, cash registers, reasonably large LED signs, etc.
MM
I can’t see this being useful for a food truck. It has a 2.5kw battery, which means it could run a 1500 watt hotplate, deep fryer, etc, for about an hour and a half of “on” time. Now of course an electric griddle, fryer, etc, doesn’t stay “on” the whole time except when it’s first heating up. The thermostat switches on and off as needed to maintain tempt. But I don’t think there’s any way this would last for a single shift running just one electric skillet. Heating is some of the most demanding use you can have for electric power.
John
All the main appliances are typically propane. The power draw of a typical food truck is not huge.
MM
Right, that was my point: you need a totally different power source to keep up with the actual cooking. This device won’t cut it. Propane will.
I suppose you could use it to power things other than your main cooking appliances–things like lights, fans, a radio, etc. But I’d think it would be easier and cheaper to wire all that up on DC running off an extra battery or two in the truck.
Mike McFalls
Agree on the use for food trucks! Any outdoor flea market or street fair (inflatables).
Al
I’m imagining this to be parked by the site plan table. Running lights, battery chargers, microwave, random tools that still need 120VAC. Fire up a gas genny to run the coffee pot and microwaveand top off the batteries.
Hopefully it can discharge and charge at the same time.
This keeps genny time to acceptable short running times. Probably would do double duty for group camping or trailer.
Ecoflow is cheaper and expandable. But lacks the red branding.
Mitherial
Ecoflow has a nice option for their larger units where they can be paired with an Ecoflow branded gas generator that will “talk” with main lithium battery banks and turn on automatically when the battery supply gets low–which is perfect for long-duration power outages or the use-case you indicate. Barring IP restrictions, it’s hard to see how all large consumer-residential-personal battery power station companies won’t offer something like this (industrial operations already have this, but usually with diesel generators).
Nate
That’s also pretty straightforward with any Victron unit and any random generator with remote-start terminals. It’s been a thing for decades, no vendor lock-in, attach whatever battery you please.
neandrewthal
I’ve built a few homes before we could get power to the site, and this would have been great. Was also before good cordless tools, but there’s still no good cordless framing nailer or compressor for framing duty. Interesting data point: I framed and roofed two 1500sf homes on less than 20 kWh of energy. So really it doesn’t take much power to build a house.
Sparkymcfly
Questions:
What is charge time?
How many cycles is a 2.5 kWh battery rated for?
Is 2.5 kWh battery replaceable?
Cost to replace 2.5 kWh battery.
How can you install in the box with a cooling fan and charge it from the vehicle alternator/ electrical system to charge while driving to jobsites?