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OUPES B2 Extra Home Backup Battery For Mega 2 Review
4,096Wh of storage, 2,500W continuous output, LiFePO4 cells. Listed at $1,329 at OUPES.
The OUPES B2 Extra Home Backup Battery For Mega 2 is a home backup systems unit holding 4,096Wh. At $0.32 per watt-hour it is priced below the median for the band, which makes it one of the cheaper ways to buy this much capacity. It uses LiFePO4 cells rated for 3,500 cycles, so it is built to be kept rather than replaced. It lists at $1,329 against an $3,099 MSRP.
Manufacturer price at the time of writing. This link is not a paid placement.
Computed from this unit’s published specification, not from a manufacturer claim. Method and the full catalogue comparison are in our power station price index.
What the OUPES B2 Extra Home Backup Battery For Mega 2 will run, and for how long
Runtimes below are calculated from the 4,096Wh rated capacity, derated to 85% for AC loads and 92% for USB and 12V loads to cover inverter and conversion losses. They are arithmetic, not lab measurements, but they are the same arithmetic applied to every unit we track, so the comparison holds. Anything drawing more than the 2,500W continuous rating is left off the list because this unit cannot carry it.
| Load | Estimated runtime |
|---|---|
| Phone charge (12Wh) | 314 charges |
| Wi-Fi router (10W) | 348 hr |
| LED work light (10W) | 377 hr |
| CPAP, humidifier off (40W) | 87 hr |
| Laptop (60W) | 58 hr |
| 12V portable fridge (45W avg) | 77 hr |
| 55-inch TV (90W) | 39 hr |
Real figures land below these. A fridge cycles rather than drawing continuously, and cold weather costs a lithium pack usable capacity, so treat the table as the ceiling rather than the expectation.
OUPES B2 Extra Home Backup Battery For Mega 2 specifications
Manufacturer figures, gathered so you can read them against everything else we track rather than against the marketing page they came from.
| Capacity | 4,096Wh |
| Continuous AC output | 2,500W |
| Cell chemistry | LiFePO4 |
| Rated cycle life | 3,500 cycles |
| Warranty | 1 years |
| Price at OUPES | $1,329 |
| Cost per watt-hour | $0.32 |
How the OUPES B2 Extra Home Backup Battery For Mega 2 compares
The closest units we track from other manufacturers in the same band, matched on capacity rather than on price.
| OUPES B2 Extra Home Backup Battery For Mega 2 | Goal Zero 3900Wh Home Backup System V3 | Jackery HomePower 3600 Plus | |
|---|---|---|---|
| Capacity | 4,096Wh | 3,900Wh | 3,584Wh |
| Output | 2,500W | 2,000W | 2,400W |
| Cycle life | 3,500 cycles | 500 cycles | 6,000 cycles |
| Weight | — | 46 lb | 77 lb |
| Price | $1,329 | $3,749.80 | $1,899 |
| Cost per watt-hour | $0.32 | $0.96 | $0.53 |
Where the OUPES B2 Extra Home Backup Battery For Mega 2 sits in its band
We track 21 units in the home backup systems band with both a price and a published capacity. They run from $489 to $10,999, and from 1,024Wh to 20,000Wh. On cost per watt-hour the OUPES B2 Extra Home Backup Battery For Mega 2 ranks 2 of 21, where 1 is the cheapest capacity in the band. That puts it in the cheapest third, which is the single strongest thing on its spec sheet. Ranking on cost per watt-hour deliberately ignores build quality, port selection and warranty, so read it as one input rather than as the answer.
Alternatives to the OUPES B2 Extra Home Backup Battery For Mega 2
Units we track in the same band that are close enough to be genuine substitutes, matched on capacity. Each links to its own review.
- Goal Zero 3900Wh Home Backup System V3 review — 3,900Wh, 2,000W output, listed at $3,749.80, $0.96 per watt-hour, dearer capacity than the OUPES B2 Extra Home Backup Battery For Mega 2.
- Jackery HomePower 3600 Plus review — 3,584Wh, 2,400W output, listed at $1,899, $0.53 per watt-hour, dearer capacity than the OUPES B2 Extra Home Backup Battery For Mega 2.
- Jackery HomePower 3600 Pro Max review — 3,584Wh, listed at $1,889, $0.53 per watt-hour, dearer capacity than the OUPES B2 Extra Home Backup Battery For Mega 2.
- Mango Power E Home Backup and review — 3,533Wh, 3,000W output, listed at $1,299, $0.37 per watt-hour, dearer capacity than the OUPES B2 Extra Home Backup Battery For Mega 2.
Who the OUPES B2 Extra Home Backup Battery For Mega 2 suits
It is a sensible buy for whole-circuit backup, extended off-grid stays, and running heavy appliances without rationing them. It is the wrong tool for anyone who needs something genuinely portable, since capacity at this level comes with real weight.
OUPES B2 Extra Home Backup Battery For Mega 2 questions
How long will the OUPES B2 Extra Home Backup Battery For Mega 2 run a fridge?
A full-size fridge averages about 50W once you account for the compressor cycling on and off. From 4,096Wh, derated to 85% for inverter losses, that is roughly 70 hr on a full charge. A 12V portable fridge draws less and will run considerably longer.
Can the OUPES B2 Extra Home Backup Battery For Mega 2 be charged by solar?
OUPES does not publish a maximum solar input for this model. Rather than estimate one, we leave it out. Check the manual that ships with the unit before buying panels for it.
What warranty does the OUPES B2 Extra Home Backup Battery For Mega 2 carry?
OUPES covers it for 1 years, and rates the cells for 3,500 charge cycles. Cycle life and warranty are different promises, and the cycle figure is the one that tells you how long the pack stays useful.
Is the OUPES B2 Extra Home Backup Battery For Mega 2 worth it?
At $1,329 it works out at $0.32 per watt-hour. It costs less per watt-hour than the median unit in its band, which is the strongest argument in its favour. Read the comparison table above against the two closest rivals before deciding.
What is not published
OUPES does not state the weight, the maximum solar input for this model. We list figures rather than estimate them, so those rows stay empty until the manufacturer publishes them. If you need one of them to make the decision, ask OUPES directly and hold them to the answer.
How we assess these
Every figure on this page comes from the manufacturer, and every derived number, cost per watt-hour and estimated runtime, is calculated the same way for all 437 products we track. That is what makes the comparison meaningful: we are not scoring units against a private impression of them, we are putting published figures side by side and doing the arithmetic in public. Where a manufacturer stays quiet, we say so rather than filling the gap.