For most households seeking substantial outage backup, I’d start with the EF ECOFLOW DELTA Pro Ultra with Extra Battery, which pairs a 12 kWh system with a modular power-station format. The ECO-WORTHY 30,720 Wh system stands out for buyers prioritizing large stated storage capacity, while the BLUETTI FridgePower is a compact choice for keeping essential appliances running. The main tradeoff is between large-capacity systems built around home loads and portable units that are easier to place but store less energy. Inverter output, battery capacity, installation needs, and solar compatibility all affect what a system can actually support. Read on for the full breakdown and guidance on matching a system to your backup priorities.
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Key Takeaways
- The EcoFlow DELTA Pro Ultra is the strongest all-around fit in this lineup for buyers who want substantial capacity in a modular power-station setup rather than a fixed 48V battery system.
- The two 30,720 Wh and 10 kW ECO-WORTHY options serve different capacity needs: the larger system is aimed at longer backup, while the 10,240 Wh model is a more restrained entry into the same high-output system style.
- Portable systems trade storage and output for simpler placement: the BLUETTI FridgePower and Anker SOLIX S2000 are better suited to selected essentials than whole-home backup.
- The Jackery HomePower 3600 Plus bundles solar panels with a 3,584 Wh power station, making it a more approachable package for buyers who want solar included rather than a large stationary installation.
- Battery capacity alone does not determine backup runtime: inverter output, the loads connected, system expansion, and the way a home is wired all shape what each option can run.
| EF ECOFLOW 12kWh Power Station: DELTA Pro Ultra with Extra Battery |  | Best for High-Power Whole-Home Backup | Output wattage: 7,200W | Maximum power: 21.6kW | Expandable capacity: Up to 90kWh | VIEW LATEST PRICE | See Our Full Breakdown |
| ECO-WORTHY 48V Home Backup Power System with 30,720 Wh Battery and 10kW Inverter |  | Best for Maximum Listed Battery Capacity | Battery capacity: 30,720Wh | Battery configuration: Six 51.2V, 100Ah LiFePO4 batteries | Inverter output: 10,000W | VIEW LATEST PRICE | See Our Full Breakdown |
| BLUETTI FridgePower Portable Power Station, 2016Wh, 1800W LFP Battery Backup |  | Best Compact Backup for a Refrigerator | Battery capacity: 2,016Wh | Expandable capacity: Up to 8,064Wh | Output wattage: 1,800W | VIEW LATEST PRICE | See Our Full Breakdown |
| ECO-WORTHY PowerMega 48V 314Ah LiFePO4 Energy Storage System with 10kW Hybrid Inverter, Bluetooth & WiFi |  | Best for a Fixed 240V Home Backup Installation | Energy storage: 16.1kWh | Battery: 48V, 314Ah LiFePO4 | Inverter power: 10kW | VIEW LATEST PRICE | See Our Full Breakdown |
| ECO-WORTHY 48V Home Backup Power Station with 10240Wh Battery and 10KW Inverter |  | Best Entry Point to a 10kW Inverter System | Battery capacity: 10,240Wh | Battery configuration: Two 51.2V, 100Ah LiFePO4 batteries | Inverter output: 10,000W | VIEW LATEST PRICE | See Our Full Breakdown |
| Jackery HomePower 3600 Plus with 2x200W Solar Panels, 3584Wh, 3600W AC Output |  | Best Portable High-Output Pick | Capacity: 3,584Wh | AC output: 3,600W | Voltage: 120V; 240V in parallel | VIEW LATEST PRICE | See Our Full Breakdown |
| Anker SOLIX S2000 Portable Power Station, 2010Wh, 1500W |  | Best Compact Portable Pick | Battery capacity: 2,010Wh | Battery type: LiFePO4 | Continuous output: 1,500W | VIEW LATEST PRICE | See Our Full Breakdown |
| home backup battery system | Weight | Output voltage | Battery capacity | Dimensions |
|---|---|---|---|---|
| EF ECOFLOW 12kWh Power Station | 293.6 lb | 120V and 240V | — | — |
| ECO-WORTHY 48V Home Backup Pow | — | 120V | 30,720Wh | 25.59 x 21.26 x 9.45 in |
| BLUETTI FridgePower Portable P | 41.9 lb | — | 2,016Wh | — |
| ECO-WORTHY PowerMega 48V 314Ah | 293.2 lb | 240V | — | — |
| ECO-WORTHY 48V Home Backup Pow | — | 120V | 10,240Wh | 20.55 x 17.13 x 5.63 in |
| Jackery HomePower 3600 Plus wi | 77.2 pounds | — | — | 15.2 x 12.2 x 19.3 inches |
| Anker SOLIX S2000 Portable Pow | 35.7 pounds | — | 2,010Wh | 8.2 x 11.1 x 12.7 inches |
More Details on Our Top Picks
EF ECOFLOW 12kWh Power Station: DELTA Pro Ultra with Extra Battery
The DELTA Pro Ultra is the strongest fit here for buyers who want substantial appliance support without starting with a fixed 48V installation. Its 7,200W inverter and 120V/240V output can serve demanding household loads, while capacity can expand up to 90kWh for longer outages. That flexibility sets it apart from the ECO-WORTHY systems, which list higher 10kW inverter output but call for a more involved setup. Solar and vehicle charging add options when grid power is unavailable, and the listed fast recharge can shorten downtime between outages. The tradeoff is physical: at nearly 294 pounds, this is not a grab-and-go station, and the inverter and battery arrive in multiple packages. I’d choose it for adaptable backup, not for a simple, lightweight emergency box.
Pros:- 7,200W output supports demanding household appliances.
- Expandable capacity up to 90kWh can extend outage coverage.
- Solar and vehicle charging provide alternatives to grid recharging.
- Supports both 120V and 240V output.
Cons:- At 293.6 pounds, it is difficult to move and position.
- Inverter and battery require coordinating multiple packages.
- The high-capacity setup may be more involved than a compact portable station.
Best for: Homeowners who need 120V/240V backup for demanding appliances and want capacity they can expand over time.
Not ideal for: Apartment residents or buyers seeking a lightweight, single-package station; the unit is very heavy and ships as multiple components.
- Output wattage:7,200W
- Maximum power:21.6kW
- Expandable capacity:Up to 90kWh
- Output voltage:120V and 240V
- Power source:Battery
- Charging options:Solar and vehicle power
- Outlets:6
- Weight:293.6 lb
Our verdict“Choose the DELTA Pro Ultra if you want expandable, high-output home backup and can accommodate its weight and multi-part setup.”
ECO-WORTHY 48V Home Backup Power System with 30,720 Wh Battery and 10kW Inverter
For buyers prioritizing stored energy, this ECO-WORTHY system has the largest listed battery bank in this group: 30,720Wh across six batteries. Its 10,000W pure sine wave inverter and expandable connections suit larger backup plans better than the BLUETTI FridgePower, which is aimed at refrigerator-scale loads and tops out at 1,800W. UL1973 and UL1741 certifications, plus Bluetooth and WiFi monitoring, add useful safety and oversight features for a system intended to stay in place. The cost of that capacity is complexity. Six batteries, a 48V architecture, and expansion options call for planning and technical confidence; this is not a portable outage kit. I’d favor it over the smaller ECO-WORTHY 10,240Wh system when longer runtime matters more than a simpler, smaller installation.
Pros:- 30,720Wh battery capacity supports longer backup than the smaller ECO-WORTHY system.
- 10,000W pure sine wave inverter is suited to high-power loads.
- UL1973 and UL1741 certifications are specified.
- Bluetooth and WiFi monitoring help track system operation.
Cons:- Multi-battery setup may require technical knowledge and professional installation.
- Large, heavy system is not practical for portable use.
- The 48V system requires careful planning for home integration.
Best for: Off-grid households or homeowners planning extended backup for multiple appliances who can manage a 48V system installation.
Not ideal for: Buyers wanting a portable, plug-in backup station or those without space and expertise for a multi-battery setup.
- Battery capacity:30,720Wh
- Battery configuration:Six 51.2V, 100Ah LiFePO4 batteries
- Inverter output:10,000W
- Inverter type:Pure sine wave
- Input voltage:48V
- Output voltage:120V
- Monitoring:Bluetooth and WiFi
- Dimensions:25.59 x 21.26 x 9.45 in
Our verdict“Pick this system for a large, expandable backup reserve if you have the space and installation support for a multi-battery 48V setup.”
BLUETTI FridgePower Portable Power Station, 2016Wh, 1800W LFP Battery Backup
The BLUETTI FridgePower takes a more focused approach than the larger systems in this roundup: it is built around refrigerator backup, not whole-home loads. Its 2,016Wh battery, 1,800W output, and 3,600W surge rating fit essential appliances better than the 10kW ECO-WORTHY systems, while the 10ms UPS switch is meant to keep connected equipment powered through a brief outage handoff. The slim body can fit into tight spaces, and expansion to 8,064Wh offers a route to longer runtimes without moving up to a large fixed battery bank. Still, output limits rule out many high-demand appliances, and its nearly 42-pound weight makes “portable” a relative term. Wall mounting also takes setup. I’d pick it for targeted kitchen backup, not whole-house coverage.
Pros:- 10ms UPS switching is designed to keep connected equipment running through an outage.
- Slim form factor can fit into narrow spaces near a refrigerator.
- Capacity can expand from 2,016Wh up to 8,064Wh.
- 3,600W surge rating provides headroom for startup loads.
Cons:- 1,800W output is not suited to many high-power household appliances.
- At 41.9 pounds, it is heavy for frequent carrying.
- Wall mounting requires additional setup.
Best for: Households that want a compact, dedicated backup source for a refrigerator and a few essential electronics.
Not ideal for: Homeowners who need 240V service or enough output to run several high-power appliances at once.
- Battery capacity:2,016Wh
- Expandable capacity:Up to 8,064Wh
- Output wattage:1,800W
- Surge power:3,600W
- UPS switching:10ms
- Self-consumption:4W
- Voltage:120V
- Weight:41.9 lb
Our verdict“Choose FridgePower for space-conscious refrigerator and essentials backup, but look to the ECO-WORTHY systems for broader, higher-output home coverage.”
ECO-WORTHY PowerMega 48V 314Ah LiFePO4 Energy Storage System with 10kW Hybrid Inverter, Bluetooth & WiFi
The PowerMega pairs a 16.1kWh LiFePO4 battery with a 10kW hybrid inverter, making it a more installation-oriented choice than the DELTA Pro Ultra. Its stated 240V output and support for split-phase and single-phase setups make it relevant to buyers planning home integration rather than wheeling a station between rooms. Active battery management and Bluetooth/WiFi monitoring add visibility into a system that is designed to remain in place. Compared with ECO-WORTHY’s 30,720Wh system, this model stores considerably less energy, so it is the better fit when a 10kW inverter and fixed installation matter more than maximum reserve. At 293.2 pounds, it needs careful placement, and the supplied details give limited guidance on inverter compatibility. Freight delivery can also complicate scheduling.
Pros:- 16.1kWh of stated energy storage for household backup.
- 10kW hybrid inverter supports high-output loads.
- 240V output and split-phase or single-phase installation options.
- Active BMS and Bluetooth/WiFi monitoring add system oversight.
Cons:- At 293.2 pounds, delivery and placement require planning.
- Freight shipping may affect delivery timing.
- Compatibility details for specific inverter models are limited.
Best for: Homeowners planning a fixed 240V or split-phase backup installation who want a 10kW inverter and integrated battery storage.
Not ideal for: Buyers who need a portable system, the longest listed runtime, or clear compatibility details before purchase.
- Energy storage:16.1kWh
- Battery:48V, 314Ah LiFePO4
- Inverter power:10kW
- Output voltage:240V
- Waveform:Pure sine wave
- Frequency:60Hz
- Monitoring:Bluetooth and WiFi
- Weight:293.2 lb
Our verdict“Choose the PowerMega for a fixed 240V-oriented installation when a 10kW inverter matters more than the much larger battery reserve of ECO-WORTHY’s 30,720Wh system.”
ECO-WORTHY 48V Home Backup Power Station with 10240Wh Battery and 10KW Inverter
This ECO-WORTHY setup offers the same listed 10,000W inverter output as the brand’s 30,720Wh system, but with a smaller 10,240Wh battery bank. That makes it a more restrained starting point for buyers who need substantial inverter power yet do not need the larger system’s six-battery reserve. Like the bigger ECO-WORTHY unit, it supports solar and battery power, lists UL and CEC safety standards, and includes Bluetooth and WiFi monitoring. Compared with the BLUETTI FridgePower, it is aimed at a much broader, fixed home setup rather than compact refrigerator backup. The tradeoff is installation work: multiple components and separate shipping for safety items call for coordination, while the provided output-voltage detail lists 120V only. I’d check home wiring needs before choosing it for 240V appliances.
Pros:- 10,240Wh battery capacity provides a substantial home backup reserve.
- 10,000W inverter output matches the larger ECO-WORTHY system.
- Capacity can be expanded for higher energy needs.
- UL and CEC standards and Bluetooth/WiFi monitoring are specified.
Cons:- Multi-component setup can be complex without technical support.
- Safety items ship separately, requiring delivery coordination.
- Listed output voltage is 120V, which may not suit buyers seeking specified 240V service.
Best for: Homeowners seeking a 10kW inverter and a moderate battery bank who can arrange setup for a multi-component 48V system.
Not ideal for: Buyers needing the longest listed runtime, a simple portable station, or clearly specified 240V output.
- Battery capacity:10,240Wh
- Battery configuration:Two 51.2V, 100Ah LiFePO4 batteries
- Inverter output:10,000W
- Power source:Solar and battery
- Input voltage:48V
- Output voltage:120V
- Monitoring:Bluetooth and WiFi
- Dimensions:20.55 x 17.13 x 5.63 in
Our verdict“Choose this ECO-WORTHY system if you want 10kW inverter capability with less stored energy than the 30,720Wh version and can manage installation details.”
Jackery HomePower 3600 Plus with 2x200W Solar Panels, 3584Wh, 3600W AC Output
The Jackery HomePower 3600 Plus suits households that want a portable battery with more appliance headroom than compact backup units offer. Its 3,600W AC output and 3,584Wh capacity can support larger loads or several devices at once, while its stated 120V and 240V capability when units are connected in parallel offers a path to broader backup coverage. Compared with the Anker SOLIX S2000, Jackery has substantially more output and stored energy, but its 77.2-pound weight makes it less convenient to carry. Wheels and a telescopic handle help with moving it around the home. The LFP battery is rated for 6,000 cycles, and hybrid AC-plus-DC charging is listed at two hours. Solar, AC, and generator charging add flexibility, though the panels ship separately and this remains a portable station rather than a whole-home battery system.
Pros:- 3,584Wh capacity provides more stored energy than the Anker SOLIX S2000.
- 3,600W AC output supports higher-wattage loads than compact portable options.
- AC, solar, and gas-generator charging offer several ways to replenish the battery.
- Wheels and a telescopic handle make its 77.2-pound frame easier to move across a home.
Cons:- At 77.2 pounds, it is difficult to lift or carry without help.
- The included solar panels ship separately, complicating setup for buyers expecting a ready-to-use solar bundle.
- Its capacity is far below the fixed multi-kilowatt-hour systems in this roundup.
Best for: Households seeking portable outage backup for several appliances, especially buyers who need higher output than a 1,500W power station can provide.
Not ideal for: Buyers who need a fixed, high-capacity whole-home system, want a light unit to carry up stairs, or only need occasional backup for a few small devices.
- Capacity:3,584Wh
- AC output:3,600W
- Voltage:120V; 240V in parallel
- Hybrid AC+DC charge time:2 hours
- Battery type:LFP (Lithium Iron Phosphate)
- Weight:77.2 pounds
- Dimensions:15.2 x 12.2 x 19.3 inches
- Warranty:5 years
Our verdict“Choose the Jackery for portable backup with higher appliance output than the Anker SOLIX S2000, but skip it if you need a stationary whole-home system.”
Anker SOLIX S2000 Portable Power Station, 2010Wh, 1500W
The Anker SOLIX S2000 is the more manageable choice for buyers who value portability over running demanding appliances. Its 2,010Wh LiFePO4 battery stores a useful amount of energy for smaller household essentials, while the 35.7-pound weight is less than half the Jackery HomePower 3600 Plus’s. That difference matters when moving a station between rooms or packing it for an emergency. The tradeoff is 1,500W continuous output: it cannot match the Jackery’s 3,600W output for higher-powered equipment, and its listed 3,000W peak is not the same as sustained capacity. The compact format also lacks a 12V DC port, which rules out some devices without an adapter. Solar input and a five-year warranty add flexibility, but this is a portable backup option, not a replacement for the roundup’s larger fixed home systems.
Pros:- At 35.7 pounds, it is substantially easier to move than the Jackery HomePower 3600 Plus.
- 2,010Wh capacity offers more reserve than small emergency power banks.
- LiFePO4 battery chemistry is specified, with a stated lifespan of 10,000 cycles.
- Solar input provides a charging option when grid power is unavailable.
Cons:- 1,500W continuous output limits which household appliances it can run.
- No 12V DC port means some devices need an adapter or cannot connect directly.
- Its 2,010Wh capacity is well below the Jackery and the larger fixed backup systems in this roundup.
Best for: People in apartments or smaller homes who want a portable battery for phones, networking gear, lights, and other moderate-load essentials.
Not ideal for: Households planning to run high-wattage appliances, needing a 12V DC connection, or seeking backup capacity for broad home coverage.
- Battery capacity:2,010Wh
- Battery type:LiFePO4
- Continuous output:1,500W
- Peak power:3,000W
- Listed runtime:35 hours
- Weight:35.7 pounds
- Dimensions:8.2 x 11.1 x 12.7 inches
- Warranty:5 years
Our verdict“Pick the Anker SOLIX S2000 for portable, moderate-load backup that is easier to move than the Jackery, not for high-wattage appliances or whole-home coverage.”
How We Picked
I ranked these systems by how well their stated capacity, inverter output, and format align with real home-backup jobs: keeping a few essentials running, supporting several household circuits, or storing energy for longer outages. I also weighed usability factors such as portability, included solar panels, expansion potential, and whether the design is a portable power station or a 48V system that may call for more involved installation. Those differences matter because a large battery is not automatically the best fit if a household cannot connect it to the loads it needs.
The ranking favors balanced, clearly stated capabilities and a practical path to matching the system to a home. The EcoFlow takes the lead for its substantial capacity and modular format; the large ECO-WORTHY systems rank strongly for storage and output but suit buyers prepared for a more involved setup. The smaller portable models rank lower for whole-home coverage, yet remain useful for targeted backup and simpler deployment. I did not treat advertised battery capacity as a guarantee of runtime, since actual results depend on loads, operating conditions, and system configuration.
Factors to Consider When Choosing Home Backup Battery Systems
Before choosing a system, I’d work backward from the outage jobs you need it to handle. A system that can run a refrigerator and communications equipment is not automatically suited to heating, cooling, or several high-draw appliances at once.
Start With the Loads You Need to Keep Running
List the appliances and devices you want available during an outage, then check their running and startup power requirements. Refrigerators, pumps, and some tools can draw a brief surge when they start, so a system’s output rating matters alongside its stored energy. A common mistake is buying by watt-hours alone and finding the inverter cannot handle a key appliance. If you only need lights, a router, and a refrigerator, a portable unit may be enough; several household circuits call for a different class of system. I’d also separate must-run loads from conveniences, since leaving nonessential devices off can stretch the same battery much further.
Match Battery Capacity to the Outage You Want to Cover
Capacity indicates how much energy a battery stores, not how long your home will run on it. Estimate daily energy use for the loads you plan to back up and allow for losses during power conversion. Long outages and frequent outages without reliable recharging point toward more storage or a system designed to expand. If your goal is short interruptions, buying a very large battery may add cost and installation complexity without improving the backup you actually need. Treat runtime estimates as planning ranges, since appliance cycling and usage habits change consumption.
Choose Portable or Installed Around Your Home
Portable power stations are easier to place and can be moved to the appliance or room that needs power, but they generally suit selected devices rather than seamless whole-home coverage. Larger 48V systems can offer substantial capacity and output, yet connecting them to home circuits may require compatible equipment and qualified installation. Check whether the system can feed your intended loads directly or needs a transfer switch or other components. A frequent buying error is assuming that a high-output inverter means the system can connect to every home circuit out of the box. Decide how much setup you are willing to take on before comparing capacity figures.
Check Solar and Recharging Compatibility
Solar panels can extend backup time when sunlight and system compatibility allow, but panel wattage is not the same as guaranteed daily energy. Review the battery’s solar input limits, supported voltage range, and connector requirements before pairing it with panels. Included panels, as with the Jackery package, can simplify the starting point, while other systems may leave panel selection and setup to you. Cloud cover, season, shade, and panel placement all affect charging. If you expect to recharge from a generator or wall outlet, check those input options too rather than assuming solar is your only route.
Plan for Expansion, Installation, and Future Needs
Expansion can make a system more adaptable, but only when additional batteries and equipment are compatible with the original unit. Confirm supported battery configurations, inverter limits, and whether the expanded system changes installation requirements. It can be tempting to buy the largest system immediately, but a modular setup may let you start with essential backup and add storage if your needs grow. For fixed home systems, account for space, ventilation, electrical work, and local requirements before ordering. Ask who will install and service the equipment, since support arrangements can matter as much as the headline capacity.
Compare Useful Output, Not Just Big Numbers
Battery capacity and inverter output answer different questions: how much energy is stored, and how much power can be delivered at one time. A high-capacity battery paired with an inverter that cannot start a particular load may not meet that household’s needs. Likewise, a powerful inverter cannot run loads for long if the battery is small. Check continuous output, surge capability, and the number and type of available outlets or connection points. For an informed comparison, write down your largest simultaneous loads and your expected daily energy use, then match both figures to the system.
Frequently Asked Questions
Can a portable power station run my whole home?
It depends on your home’s loads, the station’s output, and how power is connected. The BLUETTI FridgePower and Anker SOLIX S2000 are better viewed as options for selected essentials than automatic whole-home solutions. Even a larger portable station may not support several high-draw appliances at once or connect directly to home circuits without compatible equipment. Make a list of the devices you want to run together and check both continuous and surge output. If you want circuit-level coverage, ask an electrician about the required connection hardware.
How much battery capacity do I need for an overnight outage?
There is no single capacity that fits every household, because overnight use depends on which appliances stay on and how much energy they consume. Add up estimated energy use for essential loads across the hours you expect to need backup, then include some allowance for conversion losses. A refrigerator that cycles on and off uses energy differently from a heater or other device that runs continuously. Capacity figures in this roundup range from about 2 kWh portable units to systems with much larger stated storage, so identify your loads before picking a size. If you are unsure, track appliance use or check manufacturer consumption estimates rather than relying on a generic runtime claim.
Is a 48V system a better choice than a portable power station?
A 48V system may fit buyers who need more storage and output for multiple home loads, but it can bring a more involved installation and connection process. Portable power stations are often easier to place and use for specific appliances, with less commitment to a fixed setup. The ECO-WORTHY systems in this roundup illustrate the 48V approach, while the BLUETTI, Anker, and Jackery options use portable formats. Neither format is automatically superior: the right one depends on your backup scope, available space, and willingness to arrange electrical work. Ask a qualified installer how the system would connect to your home before choosing.
Will solar panels keep a home battery charged during a long outage?
Solar can replenish a battery during an outage, but charging depends on sunlight, panel placement, system input limits, and the energy your home uses. The Jackery package includes panels, while panel arrangements for other options may require separate compatibility checks. A cloudy day or shaded roof can reduce charging substantially, and heavy loads may consume energy faster than panels replace it. Check the system’s permitted solar input and match panel specifications before buying. For backup planning, treat solar as a potential recharge source rather than a guarantee of continuous power.
Should I choose more battery capacity or a higher inverter output?
Choose based on the problem you need to solve, because the two specifications do different jobs. More capacity can extend runtime for suitable loads, while higher inverter output can support more power at once or handle demanding startup surges. If an appliance exceeds the inverter’s limits, extra stored energy will not make it run. If the inverter can power your loads but the battery is small, the system may run out of energy sooner than you want. Check your largest simultaneous load and your expected backup duration separately before comparing systems.
Conclusion
For a balanced home-backup setup, I’d choose the EF ECOFLOW DELTA Pro Ultra with Extra Battery as the best overall pick, especially for buyers who value substantial capacity in a modular power-station format. The ECO-WORTHY 48V 10,240 Wh system is my best value direction for shoppers seeking a high-output system without stepping up to the 30,720 Wh configuration; verify installation needs and included components before deciding. For best premium capacity, the ECO-WORTHY 30,720 Wh system is the standout for buyers planning longer backup and able to accommodate a larger 48V setup. Beginners who want a ready-made package with solar panels should look at the Jackery HomePower 3600 Plus. For specific needs, choose the BLUETTI FridgePower or Anker SOLIX S2000 for targeted portable backup, not broad household coverage. My final advice: pick the loads first, then choose the system format and capacity that can support them.
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