Choose a RoseWater HUB if
your home is full of technology that should never blink, you want clean power every day and not only during outages, and the systems you care about fit within 20 kW, 40 kW or a 3-phase service.
See the RoseWater lineup
RoseWater vs Generator vs
Four ways to protect a home from power problems, compared on what each one actually does.
Which backup option is best for a home?
Side by side
Scroll the table sideways to see all four options.
| Feature | RoseWater HUB | Standby generator | Home battery (Powerwall-style) | Whole house surge protector |
|---|---|---|---|---|
| What it is | Always-online power conditioner with battery storage, between your sources and your panel | Engine-driven generator that starts when the grid fails | Battery that takes over through a gateway or transfer switch when the grid fails | Device at the panel that diverts voltage spikes to ground |
| Gap when the grid fails | None (zero transfer time) | Typically about 10 to 30 seconds | A brief switchover that varies by model | Not a backup source |
| Conditions everyday power | Yes, double conversion around the clock | No | No. Grid power passes through while the grid is up | No |
| Surge and spike protection | Yes, rated for up to 40 strikes of 140,000 V | Not its job | Not its main job | Yes, this is what it does |
| Fixes sags and brownouts | Yes, the battery fills them instantly | No. It runs only during an outage | No, not while the grid is up | No |
| Filters electrical noise | Yes | No | No | No |
| Run time in an outage | Hours, sized to the home, and longer with solar or a generator | Days, for as long as the fuel supply lasts | Hours, depending on battery count and loads, and longer with solar | None |
| Fuel, noise and exhaust | No fuel, no engine noise | Burns fuel, with engine noise and exhaust while running | No fuel, no engine noise | None |
| Works with solar | Yes, up to 10 kW through the SBX10 | Not directly | Yes, usually sold with solar | Not applicable |
| Works with a generator | Yes, one or more, and it conditions generator power | Not applicable | Depends on the product | Not applicable |
| Upkeep | Remote monitoring and hot-swappable parts serviced from the front | Regular exercise runs, oil and engine service | Little routine upkeep, app monitoring | Many units wear out after large surges and need replacing |
A dot marks the strongest option on that row. Generator timing varies with the model and the transfer switch settings. Battery switchover time varies by make and model.
Why does the gap matter?
The grid fails at 0 seconds. A dark bar means the house has no power.
RoseWater HUB
There is zero transfer time, because the house is already running on the HUB, so nothing changes when the grid drops.
Battery behind a transfer switch
Switches over automatically when it senses the outage. Usually quick, but it is a switchover, and the time varies by model.
Standby generator
The engine has to start and reach speed before the transfer switch moves. Dealers typically quote about 10 to 30 seconds.
Which one should I choose?
Choose a generator if
your main worry is a storm that takes the power out for days, and a short gap while it starts is acceptable for everything in the house. If you already have one, keep it. A HUB can sit in front of it.
How the HUB40 pairs with a generatorChoose a home battery if
you have or are adding solar, you want to store and use that energy, and your equipment tolerates a brief switchover. It is a sensible choice for many homes that do not carry heavy technology loads.
What transfer time meansChoose a surge protector if
you want an inexpensive first layer against spikes and lightning. Every home should have surge protection of some kind. It just will not help with sags, noise or outages.
Why sags matter more than surgesNot sure which combination fits? Build a Power Plan and we will recommend one for your house.
Can a HUB and a generator work together?
Comparison questions
Is a RoseWater HUB better than a generator?
Is a RoseWater HUB better than a generator?
A HUB is better at keeping the house running without a gap and at cleaning everyday power, and a generator is better at running for days on fuel. That is why many homes use both: the HUB carries the house instantly and conditions the power, and the generator recharges the HUB's batteries in a long outage.
How is a RoseWater HUB different from a Tesla Powerwall?
How is a RoseWater HUB different from a Tesla Powerwall?
A Powerwall is a battery that stores energy and takes over when the grid fails. A RoseWater HUB is a power conditioner first, with the battery built into the path, so every circuit it serves gets surge protection, voltage regulation and noise filtering all the time and there is no switchover when the grid drops.
How long does a standby generator take to turn on?
How long does a standby generator take to turn on?
Installers typically quote about 10 to 30 seconds from the outage to power restored, depending on the generator and transfer switch settings. The house has no power during that time unless something else carries it.
Is a whole house surge protector enough?
Is a whole house surge protector enough?
A whole house surge protector is a good first layer, but it only handles spikes. It does nothing for sags, brownouts, electrical noise or outages, which are the problems that cause most reboots and early equipment failures.
Can I keep my generator and add a RoseWater HUB?
Can I keep my generator and add a RoseWater HUB?
Yes. A HUB works with one or more generators. It carries the house during the generator's startup gap, conditions the generator's power, and uses it to recharge the batteries. Your electrician handles the generator wiring and we coordinate the two systems.
Sources
- RoseWater Energy, HUB comparison
- RoseWater Energy, FAQs
- RoseWater Energy, ESS vs UPS
- Norwall PowerSystems, Standby generator operation (10 to 30 second startup and switchover)
- Tesla, Powerwall
Updated October 23, 2026.
Where to go next
Build Your Power Plan
Choose what should stay on and get a first sizing for your home.
How a HUB works
Surges, sags, noise and zero transfer time, with diagrams.
Generator vs Battery Backup
How each one handles an outage, the gap before a generator starts, and why many large homes end up with both.
Powerwall Alternatives for Large Homes
Storage versus conditioning, what a 200 A panel needs, and when a different kind of system fits better.
Generator and Battery Together
How a battery and a standby generator share an outage, and why generator power still needs cleaning up.
Whole House Surge Protection Explained
What a panel surge protector stops, what it misses, and where power conditioning picks up.
Backup power FAQ
Straight answers on batteries, generators, solar and installation.
Talk to us
Call (781) 333-8003 or send a note and we will set up a consultation.
What Should Stay On When the Grid Goes Down?
Build a Power Plan for your home in a few minutes. We review it, confirm sizing on a site visit, and design a RoseWater system around the way you live.