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Battery Backup vs. Generator: Which Backup Power Source Is Best for You?
Battery Backup vs. Generator: Which Backup Power Source Is Best for You?
When you live somewhere with extreme weather or regular power outages, it's a good idea to have a backup power source for your home. There are various types of backup power systems on the market, but each serves the same primary purpose: keeping your lights and appliances on when the power goes out.
It might be a good year to look into backup power: Much of North America is at an elevated risk of blackout this summer thanks to an ongoing drought and expected higher than average temperatures, the North American Electric Reliability Corporation said Wednesday. Parts of the United States, from Michigan down to the Gulf Coast, are at a high risk making blackouts even more likely.
The SaveOnEnergy marketplace helps you search, compare, sign up and save on the right energy fit for your home — all for free. If you're interested in solar, answer a few questions to get an exact price quote from our solar advisors.
In the past, fuel-powered standby generators (also known as whole house generators) have dominated the backup power supply market, but reports of risk of carbon monoxide poisoning have led many to search for alternatives. Battery backups have emerged as a more eco-friendly and potentially safer option to conventional generators.
Despite performing the same function, battery backups and generators are different devices. Each one has a particular set of advantages and disadvantages, which we'll cover in the following comparison guide. Keep reading to find out about the main differences between battery backups and generators and decide which option is right for you.
Cynthia R Matonhodze/Bloomberg/Getty Images
Battery backups
Home battery backup systems, such as the Tesla Powerwall or the LG Chem RESU, store energy, which you can use to power your house during an outage. Battery backups run on electricity, either from your home solar system or the electrical grid. As a result, they're much better for the environment than fuel-powered generators. They're also better for your wallet.
Separately, if you have a time-of-use utility plan, you can use a battery backup system to save money on your energy bills. Instead of paying high electricity rates during peak usage hours, you can use energy from your battery backup to power your home. In off-peak hours, you can use your electricity as normal -- but at a cheaper rate.
LifestyleVisuals/Getty Images
Generators
On the other hand, standby generators connect to your home's electrical panel and kick on automatically when the power goes out. Generators run on fuel to keep your electricity on during an outage -- typically natural gas, liquid propane or diesel. Other generators have a "dual fuel" feature, meaning that they can run on either natural gas or liquid propane.
Certain natural gas and propane generators can connect to your home's gas line or propane tank, so there's no need to refill them manually. Diesel generators, however, will need to be topped up in order to keep running.
Battery backup vs. generator: How do they compare?
Pricing
In terms of cost, battery backups are the pricier option upfront. But generators need fuel to run, which means that you'll spend more over time to maintain a steady fuel supply.
With battery backups, you'll need to pay for the backup battery system upfront, as well as installation costs (each of which are in the thousands). Exact pricing will vary based on which battery model you choose and how many of them you need to power your home. However, it's common for an average-sized home battery backup system to run between $10,000 and $20,000.
For generators, the upfront costs are slightly lower. On average, the price of purchasing and installing a standby generator can range from $7,000 to $15,000. However, remember that generators require fuel to run, which will increase your operating expenses. The specific costs will depend on a few factors, including the size of your generator, which type of fuel it uses and the amount of fuel used to run it.
Installation
Battery backups earn a slight edge in this category since they can be mounted to the wall or floor, whereas generator installations require a bit of additional work. Regardless, you'll need to hire a professional for either type of installation, both of which will require a full day of work and may cost several thousand dollars.
Aside from setting up the device itself, installing a generator also requires pouring a concrete slab, connecting the generator to a dedicated fuel source and installing a transfer switch.
Maintenance
Battery backups are the clear winner in this category. They're quiet, run independently, don't produce any emissions and don't require any ongoing maintenance.
On the other hand, generators can be quite noisy and disruptive when they're in use. They also emit exhaust or fumes, depending on which type of fuel they use to run -- which may irritate you or your neighbors.
Keeping your home powered
As far as how long they can keep your home powered, standby generators easily outperform battery backups. As long as you have enough fuel, generators can run continuously for up to three weeks at a time (if necessary).
That's simply not the case with battery backups. Let's use the Tesla Powerwall as an example. It has 13.5 kilowatt-hours of storage capacity, which can provide power for a few hours on its own. You can get extra power out of them if they're part of a solar panel system or if you use multiple batteries in a single system.
Expected lifespan and warranty
In most cases, battery backups come with longer warranties than standby generators. However, these warranties are measured in different ways.
Over time, battery backup systems lose the ability to hold a charge, much like phones and laptops. For that reason, battery backups include an end-of-warranty capacity rating, which measures how effective a battery will hold a charge by the end of its warranty period. In Tesla's case, the company guarantees that the Powerwall battery should retain 70% of its capacity by the end of its 10-year warranty.
Some backup battery manufacturers also offer a "throughput" warranty. This is the number of cycles, hours or energy output (known as "throughput") that a company guarantees on its battery.
With standby generators, it's easier to estimate lifespan. Good-quality generators can run for 3,000 hours, as long as they're well maintained. Therefore, if you run your generator for 150 hours per year, then it should last about 20 years.
Which one is right for you?
Across most categories, battery backup systems come out on top. In short, they're better for the environment, easier to install and cheaper to run long-term. Plus, they have longer warranties than standby generators.
With that said, traditional generators can be a good option in some cases. Unlike battery backups, you only need a single generator to restore power in an outage, which brings down the upfront costs. Plus, standby generators can last longer than battery backup systems in a single session. As a result, they'll be a safer bet if the power is out for days at a time.
Will Your Solar Panels Keep the Lights On During a Blackout? What to Know
Will Your Solar Panels Keep the Lights On During a Blackout? What to Know
It's happened to most of us: You're enjoying a quiet evening at home when suddenly, the lights go out. You flip the switch on the breaker and no luck. Looking down the street, you can see all the lights are out down the block, too. It's a blackout, and everyone in your neighborhood is without power until the grid is restored.
If you have solar panels that power your home, you might think they would exempt you from this problem. After all, you're not fully reliant on the grid to get your electricity; it all comes from the sunlight hitting your solar panels. But during a blackout, depending on the solar system that you have installed, you might be left in the dark no matter what.
Read more: Best Solar Companies for 2022
Will solar panels work in a blackout?
Most solar panels won't work in a blackout. This isn't because they are no longer capable of converting sunlight into electricity, but because of how most solar systems work.
The majority of solar systems are grid-tied systems, meaning they're still attached to the standard utility grid. This is so solar panel users can still receive electricity from their utility company if the solar panels fail to generate enough to meet demand and so they can sell excess solar energy to the utility company.
Most solar systems are connected to the grid via a solar inverter. This is a meter that measures and tracks the amount of energy generated and used by your home. Most solar inverters tie you to the grid, so if the grid shuts down during a blackout, your solar panels also stop generating and providing electricity to your home.
This is in part for the safety of repair workers, who need to know that busted electric lines are not carrying electricity from solar panels.
How to make your solar panels keep the lights on during a blackout
There are solar systems that aren't beholden to the status of the electricity grid and which continue to operate even during a blackout.
Solar panels and battery backups can help in a blackout, though only with specific equipment.
Lucas Knappe/EyeEm/Getty Image
The first option is an off-grid system, which does not require a solar inverter to connect you to the electric grid. Off-grid systems are often more expensive, in part because they can't participate in some of the unique payment schemes that on-grid solar systems offer, like net-metering: selling solar energy back to the utility company in order to cover the cost of any additional electricity used.
Off-grid systems also have one significant downside: There's no backup plan if your solar panels fail or struggle to generate enough energy. On-grid systems simply take energy from the utility grid when needed. That means if your solar panels aren't able to generate enough energy to meet the demand you're creating, you just get your electricity the traditional way. Off-grid systems don't have that option. So if they can't generate enough electricity to meet your needs, you're going to be in the dark.
Read more:Do Solar Panels Save Money? Yes. Here's How
The second option to keep your power on during a blackout is solar battery systems, which allow you to store some of the electricity generated by your solar panels during the day and deploy it at a time when you need it most. Solar panels generate lots of energy during the middle of the day when the sun is high, but less during peak hours in the evening. A solar battery lets you stash that power and use it later, either to meet your needs during peak or even to take over completely when the power goes out.
A battery system does this by disconnecting your home from the grid at the moment of a blackout. This is called "islanding." A few standalone inverters can do this without batteries, too.
Solar battery systems can be pricey, which is why many people opt not to use it. Much like the fully off-grid system, solar batteries are cost prohibitive and don't benefit from the same pricing schemes that help mitigate the up-front cost that on-grid systems provide. But it's a failsafe that will keep your power on when you need it.
Solar panels are a great option for energy independence, freeing you from reliance on the fossil fuels that are typically used to generate the electricity that comes from the grid. But don't assume that your home's solar panels will keep your lights on. even during a blackout. You'll need to invest in the right system to make that happen, and it can carry a significant financial burden to fully remove yourself from the grid.
Advertiser Disclosure: CNET's corporate partner, SaveOnEnergy, can help you find the right energy fit for your home. The SaveOnEnergy marketplace helps you search, compare, sign up and save on the right energy fit for your home — all for free. If you're interested in solar, answer a few questions to get an exact price quote from our solar advisors.
Samsung QN90B Review: This QLED TV From the Future's So Bright
Samsung QN90B Review: This QLED TV From the Future's So Bright
The best TVs I've reviewed use OLED screens, but OLED isn't the be-all, end-all in picture quality. High-end TVs with LCD-based screens can get brighter than any OLED television and come pretty close in other important areas like contrast. Samsung's QN90B is a great example, delivering searing brightness with few other compromises thanks to QLED, mini-LED and local dimming technology. It's a futuristic-sounding mouthful, but it works.
I compared the Samsung side-by-side with an LG OLED TV and while the LG won, the Samsung came as close as any non-OLED TV I've tested. The QN90B's ability to focus that light output with very little blooming or stray illumination produces excellent punch, contrast and overall fidelity, surpassing the performance of last year's excellent QN90A.
And as usual Samsung's design and features are top-notch. From the slick stand to the tricked-out remote to a raft of gaming extras, including a new cloud gaming hub with Xbox Game Pass compatibility, the QN90B is simply stacked. If you're in the high-end TV market and looking for an alternative to OLED, or you just have a bright room, the QN90B deserves a look.
Samsung QN90B sizes
I performed a hands-on evaluation of the 65-inch QN90Bbut this review also applies to the other screen sizes in the series. All sizes have similar specs and should provide similar picture quality.
The QN90B sits at the high-end of Samsung's 4K Neo QLED TV line for 2022. Its main improvement over the less expensive QN85B is better local dimming, according to the spec sheet. Samsung does offer a more expensive 4K model, the QN95B, but its main perk over the QN90B is a separate OneConnect box for the inputs that allows you to run a single cable to the TV. Samsung also charges more for its 8K series, but we don't think it's worth paying extra for that higher resolution. The flagship 8K QN900B has better local dimming than the QN90B and should deliver a superior picture, but it's more than twice as expensive.
Unlike many TVs that use legs spread out to either side, the QN90B has a central pedestal stand.
Bobby Oliver/CNET
Distinctive touches, excellent remote
On the outside the QN90B looks basically the same as last year's QN90A, and that's a good thing. Minimalist and nearly all-picture, its most distinctive feature is the stand, which Samsung's website calls a "bending plate." I'm here for that. Centered, with a small footprint, it looks cleaner and sleeker than the dual legs found on most TVs. My favorite aspect is how it suspends the big panel above my credenza, seeming to float.
The clicker includes voice access via the mic button as well as streaming shortcuts keys.
Bobby Oliver/CNET
Samsung's sleek, rounded remote is my favorite TV clicker overall thanks to superior form and function. The keys are well-placed, pleasantly sparse and lack garish colors, the raised volume and channel bars are a nice change from standard buttons and the metallic, wraparound finish feels high-end. I love that it's rechargeable rather than reliant on batteries, and you can top it off via USB-C, the solar cell on the back or RF harvesting. I didn't test the latter two methods.
Cluttered menu, cool cloud gaming
I went through my complaints with Samsung's new 2022 TV menu design in my Q60B review so I'll mention them only briefly here. Too much screen real estate is wasted with ads, clutter and items I don't care about, while many useful functions are buried deep in sub-menus. All the options can be fun to explore, but overall the menu looks dated and feels less personal than Google TV on Sony, for example. I'm still partial to Roku TV for its simplicity, and this iteration of Samsung's TV menus is the opposite. Unlike the Q60B, however, I didn't encounter any lag with the QN90B -- responses were plenty quick.
A new feature for 2022 is Samsung's game hub, which features cloud gaming from services like Xbox Game Pass and Google Stadia, as well as quick access to connected video game consoles.
Bobby Oliver/CNET
Like all Samsung TVs the QN90B has Samsung's new gaming hub, which connects to cloud gaming services including Xbox Game Pass, Google Stadia, Nvidia GeForce Now and Amazon Luna. I tried it out with a fast wired Ethernet connection, as Samsung recommends, and the experience playing Halo: Infinite was pretty good. My Xbox controller paired easily to the TV and responses were quick as I fought grunts and rode the Mongoose across the map. Graphics were quite a bit softer than the game on an Xbox Series X, as expected, but gameplay was similar.
As with all cloud services your mileage may vary. I tried out a much slower Wi-Fi connection, for example, and the game was unplayable. But assuming you have a good connection (Samsung recommends 50Mbps or more), the ability to play games using just the TV, without needing a console at all, is really cool.
Xbox Game Pass Ultimate on Samsung TVs lets you play games directly on the TV using cloud streaming, no console required.
Bobby Oliver/CNET
As with last year you can choose between Alexa, Google Assistant and Samsung's own Bixby for your voice assistant, accessible by speaking into the remote or via speaking the wake word ("Alexa," for example) into thin air. (The always-listening mic can be disabled if you want.) The TV also works with Apple AirPlay.
Cutting-edge LCD TV tech
The most important image quality feature on the QN90B is that Neo QLED, mini-LED powered backlight with full-array local dimming. Local dimming improves LCD image quality by making certain areas of the picture dimmer or brighter in reaction to what's on the screen, which significantly boosts contrast, while CNET's testing has found mini-LEDs are brighter than larger ones. Judging from Samsung's obscure "quantum HDR 32X" spec the QN90B has more dimming zones and brighter images than the step-down Q85B, and fewer zones than the 8K models, but Samsung doesn't say exactly how many zones (or how bright). It does tout new-for-2022 "shape adaptive light control" processing, said to reduce blooming and stray illumination, and it seems to work well.
Key features
Display technology
LED LCD
LED backlight
Full array with local dimming
Resolution
4K
HDR compatible
HDR10, HDR10 Plus
Smart TV
Samsung Smart Hub
Remote
Voice with USB, solar recharging
Like all of Samsung QLED TVs, as well as most higher-end TVs from Vizio, Hisense and TCL, the QN90B's LCD panel is augmented by a layer of quantum dots -- microscopic nanocrystals that glow a specific wavelength (that is, color) when given energy. The effect is better brightness and color compared to non-QD-equipped TVs. The QN90B uses a true 120Hz panel, which improves the TVs' motion performance.
The set supports high dynamic range content in the HDR10 and HDR10 Plus formats. Samsung TVs lack the Dolby Vision HDR support found on most competitors' HDR TVs. I've seen no evidence that one HDR format is inherently "better" than the other, so I definitely don't consider the lack of Dolby Vision a deal-breaker on this TV.
Connectivity is ample on the Samsung QN90B TV, with 4 HDMI that can all handle 4K/120Hz signals, 2 USB ports, an Ethernet connection and more.
Bobby Oliver/CNET
Connectivity is excellent. All four of its HDMI inputs are compatible with 4K/120Hz signals, so if you have multiple devices that output it -- like a PlayStation 5 and an Xbox Series X and a high-end PC card (you know who you are...), you're all set. The QN90B also handles variable refresh rate, including AMD's FreeSync Premium Pro and standard VRR formats, ALLM (also known as Auto Game Mode) which lets it automatically switch to game mode to reduce input lag when it detects you're playing a game, and eARC.
Four HDMI inputs with HDMI 2.1, HDCP 2.2
Two USB 2.0 ports
Optical digital audio output
RF (antenna) input
RS-232 port (minijack, for service only)
Ethernet (LAN) port
The list is mostly solid, unless you happen to own a legacy device that requires analog video (component or composite) or audio. Like many new high-end TVs the QN90B lacks analog inputs entirely, audio or video. On the flipside, it is one of the few TVs with a built-in ATSC 3.0 tuner for Next-Gen TV signals.
The channels also run the length of the TV from the power cable to the input section.
Bobby Oliver/CNET
Picture quality comparisons
For my comparisons I set up the Samsung QN90B next to two other high-end TVs, the Sony KD-65X95K, another mini-LED-equipped model, and the LG OLED65C1P, an OLED-based TV and my current Editors' Choice. I would have liked to use the newer C2 in my comparison but it wasn't available, and the C1 is a good substitute since the two have similar picture quality.
TV and movies: As usual I started my comparison with the montage from the Spears and Munsil HDR benchmark, and the Samsung's brightness advantage over the other two was immediately apparent. The snowcapped mountains, desert sand, clouds and other well-illuminated areas had more impact next to the Sony and LG. Meanwhile in dark scenes with mixed content, like a nighttime cityscape, the LG looked more natural with truer shadows, while the Samsung and Sony appeared slightly more washed-out. The color of the white snow and other areas on the Samsung also looked a bit bluer and less-accurate than the others, but it's nothing that would be noticeable outside of a side-by-side comparison.
The Samsung did a superb job of controlling blooming, or stray illumination that can leak into dark areas from adjacent bright ones. In the montage's difficult black-background scenes, for example the pen tip and the honey dripper, I saw only very faint brightness near the edge of the brightest objects on the Samsung while the Sony was worse. Especially considering its brightness the QN90B's lack of blooming is remarkable, although of course the OLED didn't show any blooming whatsoever.
Switching to an actual movie, The Gray Man on Netflix, the LG pulled ahead a bit. In the dramatic dark scenes like the initial interrogation or the Bangkok nightclub, the OLED TV's ability to preserve darkness in shadows game it a more theatrical look. The Samsung was still excellent, however, and the brightness advantage in the fireworks over the city, for example, was clear over the dimmer OLED. Again the Sony trailed the other two slightly, with dimmer highlights than the Samsung and more obvious blooming, particularly in the letterbox bars.
Game Mode on Samsung TVs includes numerous settings for various types of games, as well as status displays for advanced features like variable refresh rate and frames per second.
Bobby Oliver/CNET
Gaming: The QN90B is a very good gaming TV but I liked image quality in game mode on the other two better. Playing Stray on the PS5, colors looked over-saturated and inaccurate in most of the Samsung's modes, making the leaves of the foliage appear lime-colored, for example. The exception was Sports mode, which tamed colors (especially green) somewhat and brought them somewhat closer to the more-accurate LG and Sony. Of the other picture modes – Standard, RGP, RTS, FPS and Custom – I found it difficult to see any difference between the first four.
I also noticed occasional banding in bright-to-dark areas of Stray, for example around the lights when the kitty fell down the sewer and the picture faded to black and then back up. The LG and Sony looked smooth by comparison. In certain mixed scenes the Samsung's brightness was too much in a dark room, and I ended up using Custom picture mode and reducing brightness from the default 50 to around 10, but that's mainly a matter of personal preference and room lighting.
I did appreciate that the TV automatically detected my Xbox and switched to game mode, and that the game bar displayed status icons for various settings, confirming when I was using VRR or 120 frames per second, for example. Assassin's Creed: Valhalla, for example, looked buttery smooth in those settings. There are three choices to reduce input lag and I kept it on "Fastest," which measured a respectable 10 milliseconds, compared with 14ms and 23ms for "Faster" and "Fast," respectively.
Bright lighting: The QN90B is technically the brightest TV I've ever tested, beating out the Hisense U8G in its brightest settings. I say "technically" because its Dynamic numbers, listed below, are badly inflated. Even so it's exceedingly bright in its accurate modes too, especially compared to competing OLED models.
Light output in nits
TV
Brightest mode (SDR)
Accurate mode (SDR)
Brightest mode (HDR)
Accurate mode (HDR)
Samsung QN65Q90B
2,625
974
3,316
1,981
Hisense 65U8G
1,619
1,612
2,288
2,288
Sony KD-65X95K
1,268
421
1,400
1,305
TCL 65R635
1,114
792
1,292
1,102
Vizio P65Q9-J01
1,099
463
1,130
762
LG OLED65C2
413
389
812
759
LG OLED65C1
409
333
790
719
As usual the Samsung's brightest setting, Dynamic, has woefully inaccurate color. For the accurate measurements I used Movie mode with both HDR and SDR, although for SDR the Movie number was achieved by setting the local dimming to High (go to Home > Menu > Settings > All Settings > Picture > Expert Settings > Local Dimming).
The QN90B maintained steady HDR light output over time in Movie and Filmmaker modes, but in Dynamic mode with both HDR and SDR it fluctuated significantly, starting out at 3,300 and 2,600 nits respectively but falling almost immediately to around 500 -- almost a sevenfold decrease, which is massive. I've seen that behavior on past Samsung TVs as well and it seems designed to achieve prominence in charts like the one you see above. No other TV brand I've tested shows anywhere near that level of brightness change. This issue in Dynamic mode isn't a huge deal for me, however, because I don't recommend using that mode anyway.
Samsung's light-rejecting screen remains the best in the business, maintaining contrast and punch in bright lighting, and reducing reflections, better than the Sony and the LG. The screen, combined with the QN90B's prodigious light output, make it the best TV I've ever tested for bright rooms.
Uniformity and viewing angle: With test patterns I saw minor variations in brightness across the Samsung's screen, more so than the Sony and LG, but I didn't notice them during regular video. From off-angle seats to either side of the sweet spot directly in front of the TV, the two LCDs lost color and black level fidelity at about the same rate, while the LG was essentially perfect. The Sony's blooming was more noticeable from off-angle, however.
In-depth picture settings on the Samsung QN90B include adjustments for its full-array local dimming feature, among many others.
Bobby Oliver/CNET
Picture setting and measurement notes
The default Movie and Filmmaker modes were the most accurate, and pretty much equally so. For HDR, grayscale in bright areas was less-accurate (skewed too much toward green) than I expected in the default Warm 2 setting – switching to Warm 1 helped a bit (it was still too blue, but better) so that's what I'd recommend using. For the Geek Box measurements below I went with Filmmaker/Warm 1. In its favor the Samsung's EOTF for HDR was excellent.
Some other reviewers have reported that 2022 Samsung TVs, namely the S95B QD-OLED TV and the QN95B QLED TV, "cheated" measurements by improving brightness and accuracy with standard 10% window patterns. When using non-standard-sized windows, they reported significantly less-accurate color as well as lower brightness.
I did not see evidence of cheating on my Samsung-supplied QN90B review sample. I took measurements with various non-standard grayscale window sizes (7%, 9%, 11% and 13%) in HDR (Filmmaker mode) and they were quite consistent in terms of peak brightness, color accuracy and EOTF compared to the standard 10% window. The same goes for 9% and 10% windows with color patterns (ColorMatch HDR). I also measured peak brightness over time and for a two-minute period the image maintained a healthy 1900-ish nits in Filmmaker mode (although as mentioned above, it fluctuated wildly in Dynamic). I don't doubt the reports of other reviewers, but for whatever reason I didn't experience this issue.
Smoothing, also known as the soap opera effect, is completely disabled in Filmmaker Mode, which I prefer for TV shows and movies. In Movie mode there's more-noticeable smoothing turned on by default (Judder Reduction = 3), but you can adjust it to your heart's content by choosing a preset or tweaking the Custom sliders (Menu > All Settings > Picture > Expert Settings > Picture Clarity Settings > Custom).
Geek Box
Test
Result
Score
Black luminance (0%)
0.003
Good
Peak white luminance (SDR)
2625
Good
Avg. gamma (10-100%)
2.14
Good
Avg. grayscale error (10-100%)
3.85
Average
Dark gray error (30%)
3.31
Average
Bright gray error (80%)
5.21
Poor
Avg. color checker error
3.27
Average
Avg. saturation sweeps error
3.51
Average
Avg. color error
2.97
Good
1080p/24 Cadence (IAL)
Pass
Good
Input lag (Game mode)
10.73
Good
HDR10
Black luminance (0%)
0.003
Good
Peak white luminance (10% win)
3315
Good
Gamut % UHDA/P3 (CIE 1976)
94.71
Average
ColorMatch HDR error
2.50
Good
Avg. color checker error
2.10
Good
Input lag (Game mode, 4K HDR)
10.50
Good
See How We Test TVs for more details and explanations of the Geek Box results.
Portrait Displays Calman calibration software was used in this review.
