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A home battery backup keeps essential appliances running when the grid goes down. The right system depends on how much power you need, which circuits you want to back up, and whether you plan to add solar charging later. Key factors include total energy capacity, continuous output wattage, battery chemistry, and how quickly the system switches over during an outage.
For a deeper dive into battery specs, see our guide on how to compare home solar batteries and learn more about essential vs. whole-home backup.
Every specification on this page comes from the manufacturer’s own product page, checked on 29 October 2026. We have not used these products ourselves, so the picks are based on published specifications only.
If you’re also considering portable power stations, see our portable power station comparison and home solar battery guide.
How we chose these
- Capacity and expandability: How much energy storage you need and whether the system can grow with additional batteries.
- Output power: The continuous wattage available to run multiple appliances at once, including surge requirements.
- Battery chemistry: LFP (LiFePO4) batteries typically offer longer cycle life and stable performance.
- Switchover speed: The delay before backup power activates; faster times protect sensitive electronics.
Not all makers list every specification; ‘Not stated’ appears where information was unavailable.
Comparison table
| Product | Capacity | Output Power | Battery Type | Expandable Capacity | Switchover Time |
|---|---|---|---|---|---|
| EcoFlow TITAN 5000 | 5-30 kWh | 7.2 kW | LFP | Up to 30 kWh | Not stated |
| EcoFlow TITAN 5000 Classic | 5-30 kWh | 4,000 W | LFP | Up to 30 kWh | ≤20 ms |
| OUPES Guardian 6000 V2 | 4.6-41.4 kWh | 6,000 W (7,200 W boost) | LFP | Up to 41.4 kWh | 20 ms |
| OUPES Mega 3 | 5,120 Wh (expandable to 15.36 kWh) | 3,600 W (7,000 W surge) | LiFePO4 | Up to 15.36 kWh | Not stated |
| ECO-WORTHY 12kW 30kWh | 30 kWh | 12 kW | Not stated | Beyond 30 kWh (up to 32 batteries) | Not stated |
Capacity and expandability figures are as stated by each maker. Switchover time is the delay before backup power activates during an outage.
1. EcoFlow TITAN 5000: for whole-home backup with 240V appliances
EcoFlow says the TITAN 5000 provides 100% whole-home backup with 7.2kW output, capable of running a 3-ton AC and refrigerator simultaneously without a soft starter. It uses an industry-first 200V architecture and custom high-rate LFP cells. The system has UL 9540 certification and passed UL 9540A testing, along with 24/7 BMS monitoring. AC coupling with existing rooftop solar requires the Smart Home Panel 10 and a CT sensor.
- UL 9540 certified (EcoFlow)
- AI-based OASIS 3.0 energy manager (EcoFlow)
- 200V architecture (EcoFlow)
Pros: High 7.2kW output powers large appliances; expandable to 30kWh; UL certified for safety
Cons: Switchover time not stated; requires additional panel for solar integration
Check the EcoFlow TITAN 5000 on Amazon
2. EcoFlow TITAN 5000 Classic: for essential 120V backup with quiet operation
EcoFlow describes the TITAN 5000 Classic as providing 4,000W of whole-home essential power for items like fridges, microwaves, and Wi-Fi. It operates at under 25 dB, quiet enough for indoor use. The system supports 120V output only, so 240V appliances like central AC are not supported. It includes a 5-year warranty and is UL 9540 certified.
- ≤20 ms automatic switchover (EcoFlow)
- Under 25 dB noise level (EcoFlow)
- 5-year warranty (EcoFlow)
Pros: Fast 20ms switchover; very quiet; UL certified; 5-year warranty
Cons: 120V only, cannot run 240V appliances; lower output than the standard TITAN 5000
Check the EcoFlow TITAN 5000 Classic on Amazon
3. OUPES Guardian 6000 V2: for high-power 240V backup with fast solar charging
OUPES says the Guardian 6000 V2 offers dual voltage output: 240V/6,000W and 120V/3,600W, with a boost to 7,200W. It can expand from 4.6 to 41.4 kWh and recharges in 84 minutes via 3,600W solar input with dual MPPT. The system supports OTA firmware updates and has a 20ms EPS backup switchover.
- 3,600W solar input, dual MPPT (OUPES)
- 84-minute recharge time (OUPES)
- OTA firmware updates (OUPES)
Pros: High 6,000W output with 240V; large expandable capacity; fast solar charging
Cons: Switchover time is 20 ms, the same as the TITAN 5000 Classic; OUPES lists large wheels, so it is built to move rather than mount
Check the OUPES Guardian 6000 V2 on Amazon
4. OUPES Mega 3: for mid-range backup with fast AC+solar charging
The OUPES Mega 3 provides 5,120Wh capacity and a 3,600W pure sine wave inverter with 7,000W surge. It can expand up to 15.36kWh using B2 extra batteries. OUPES notes it fully recharges in 1 hour with 3,900W max input from AC and solar combined. It offers seamless UPS backup and smart app control.
- 3,900W max input (OUPES)
- 1-hour full recharge (OUPES)
- 16 output ports (OUPES)
Pros: 1-hour full recharge with AC and solar combined; 7,000W surge; expands to 15.36kWh with B2 batteries
Cons: Lower base capacity than the whole-home systems; switchover time not stated
Check the OUPES Mega 3 on Amazon
5. ECO-WORTHY 12kW 30kWh Hybrid Home Backup Power Storage System: for whole-home backup with high inverter output
ECO-WORTHY describes this system as a hybrid home backup solution with 120V/240V split-phase output and a 12kW hybrid inverter, and says it can run essential appliances, HVAC systems and large household loads during outages. ECO-WORTHY says battery capacity can grow beyond 30kWh, with support for up to 6 inverters (72kW total output) and 32 batteries.
- 120V/240V split-phase (ECO-WORTHY)
- Scalable to 72kW with 6 inverters (ECO-WORTHY)
- Built around 48V 100Ah batteries (ECO-WORTHY)
Pros: Very high 12kW output; scalable to large capacity; split-phase for whole home
Cons: Battery chemistry not stated; switchover time not stated; ECO-WORTHY does not list solar input in this listing
Check the ECO-WORTHY 12kW 30kWh Hybrid Home Backup Power Storage System on Amazon
Which one fits you
| Your situation | Look at | Why |
|---|---|---|
| You need to run a central AC and large 240V appliances | EcoFlow TITAN 5000 or OUPES Guardian 6000 V2 | High output and 240V support |
| You want a quiet, indoor-friendly backup for essential 120V circuits | EcoFlow TITAN 5000 Classic | Low noise and fast switchover |
| You want room to grow far beyond 30 kWh | ECO-WORTHY 12kW 30kWh or OUPES Guardian 6000 V2 | Both list large expansion: up to 32 batteries for ECO-WORTHY, up to 41.4 kWh for OUPES |
| You need a smaller backup for a few essentials | OUPES Mega 3 | 5,120Wh base capacity with a 1-hour full recharge |
Practical tips
- Consider the appliances you need to back up and their starting surge watts.
- Look for LFP batteries for longer cycle life.
- Check if the system supports 240V if you have large loads like well pumps or AC.
- Ensure the switchover time is fast enough for sensitive electronics.
FAQ
What is the difference between whole-home and essential backup?
Whole-home backup powers most or all circuits, including 240V appliances, while essential backup covers critical 120V loads like refrigerators and lights.
How much battery capacity do I need?
It depends on your daily energy use and how long you want backup to last. The systems here start at 4.6kWh or 5kWh and expand to more than 40kWh.
Can I add solar panels to these systems?
Many systems support solar charging; check the maker’s specifications for solar input limits.
What is the lifespan of these batteries?
OUPES says the Guardian 6000 V2 keeps 80% capacity after 4,000+ cycles and the Mega 3 after 3,500+ cycles. EcoFlow and ECO-WORTHY do not list cycle life in these listings.
Sources
Specifications from each manufacturer’s product page, checked 29 October 2026: EcoFlow TITAN 5000, EcoFlow TITAN 5000 Classic, OUPES Guardian 6000 V2, OUPES Mega 3, ECO-WORTHY 12kW 30kWh Hybrid Home Backup Power Storage System. Makers can change specifications; check the product page before you buy.
