OUPES Mega 2 Review (2026): Mega 2 vs Mega 2 Pro, and What to Buy

The OUPES Mega 2 is a 2,048Wh LiFePO4 power station with 2,500W of 120V output, a 30A TT-30R RV outlet and expansion to 10.24kWh. On November 10, 2026, OUPES marked both it and its April 2026 replacement, the Mega 2 Pro, sold out, at list prices of $1,499 and $1,599. Buy either one only on sale, well under $1,000; at list price, the in-stock 2kWh units below cost less.

How we evaluated it: Our verdict is based on OUPES's published specifications and FAQs for both models, the Mega 2 Pro user manual, the Amazon listing, two independent reviews of the original Mega 2 (The Solar Lab and The Gadgeteer), and the runtime arithmetic shown below.

OUPES Mega 2 ProCheck price on Amazon

OUPES Mega 2 review: quick verdict

The Mega 2 was one of the cheapest ways to get 2kWh, 2,500W and an RV outlet in one box. Its list price was always $1,499, but OUPES's own store sold it for $649 on April 2, 2026 (Slickdeals), about $317 per kWh, less than any big-brand 2kWh unit. Its faults are real: The Solar Lab found it shut off at once under a 3,000W load despite a 5,400W surge rating, its 2,100W solar rating works out to about 1,000W with OUPES's own panels, its UPS switches over in 20ms rather than 10ms, and OUPES lists no UL certification. The Mega 2 Pro restates surge as a 3,800W peak and adds a 1,000W DC port, but cuts rated solar input to 1,000W.

OUPES Mega 2 and Mega 2 Pro specs

Spec	Mega 2 (2023)	Mega 2 Pro (2026)
Capacity	2,048Wh LiFePO4	2,048Wh LiFePO4 (51.2V, 40Ah)
Rated cycles	3,500+ to 80%	4,000+ to 80% on OUPES's spec table (the Amazon listing says 3,500+)
AC output	2,500W; 5,400W surge claimed	2,500W; 3,600W Boost Mode; 3,800W peak
AC outlets	Four NEMA 5-20R and one TT-30R (120V/30A)	Same; the Amazon listing caps the four 5-20R outlets at 2,400W together
USB	Four USB-A (18W), two USB-C (100W)	Two USB-A (18W), two USB-C (140W)
12V DC	Car socket and two 5521 barrels (12V/10A each); Anderson output (12V/30A)	Two car sockets (12V/10A); one Anderson port, 12-80V, 30A, 1,000W, shared with the solar input
AC charging	1,600W fast, 800W slow	1,800W fast, 900W slow (15A max)
Solar input	2,100W max, 12-148V (MPPT 18-140V), 15A	1,000W max, 12-80V (MPPT 18-80V), 30A
AC plus solar	3,700W	2,800W
UPS (EPS)	Under 20ms, up to 2,500W	20ms or less, up to 2,500W
Expansion	Up to four B2 Extra Batteries (10.24kWh)	Same; the Guardian 6000's G5 packs do not fit
App	OUPES app over 2.4GHz Wi-Fi or Bluetooth	Same, plus over-the-air firmware updates, scheduled charging and a 25 to 85% backup reserve
Weight and size	48.5 lb; 18.1 x 10.6 x 12.0 in	48.8 lb; 18.4 x 11.6 x 11.6 in
Operating temperature	32°F to 104°F	32°F to 104°F
Ratings listed	IP21; UN38.3 and MSDS	IP21; UN38.3 and MSDS
In the box	AC cable plus Anderson-to-Anderson, 7909-to-Anderson and car-to-Anderson cables	AC cable and a car-to-Anderson cable; solar adapter cables sold separately
Warranty	5 years, plus a sixth with registration	Same
Price (November 10, 2026)	$1,499 list at OUPES, marked sold out	$1,599 list at OUPES, marked sold out; out of stock on Amazon

How long will the OUPES Mega 2 run your devices?

The formula is the one in OUPES's FAQ: runtime (hours) = 2,048Wh x 0.85 / load (W), which leaves about 1,741Wh of usable AC energy. The Solar Lab's discharge test landed close to that: a 2,330W load ran for 44 minutes, which it scored as 83% efficiency. Draws come from our appliance power guide; fridges and freezers use ENERGY STAR's certified daily energy because their compressors cycle. The same figures apply to the Mega 2 Pro, which has the same battery.

Device	Average draw	Estimated runtime
Wi-Fi router and modem	20W	About 87 hours (3.6 days)
CPAP with heated humidifier	55W	About 32 hours (four 8-hour nights)
Starlink (Standard kit)	100W	About 17 hours
Full-size refrigerator	1,500Wh a day (ENERGY STAR median)	About 28 hours
Chest freezer (7 cu ft)	620Wh a day (ENERGY STAR median)	About 2.8 days
Outage essentials: fridge, router, lights, phones	150W average	About 11.6 hours
10,000 BTU window AC	667W	About 2.6 hours
13,500 BTU RV roof AC	1,800W	About 58 minutes
Microwave (1,000W cooking power)	1,500W	About 70 minutes of cooking
1/2 HP sump pump (running)	1,050W	About 1.7 hours of pump run time

The idle catch. The Solar Lab found its Mega 2 drained faster than most units while sitting idle, even with the inverter off, though it gave no wattage. OUPES publishes no standby figure for either model, while BLUETTI claims 10W for the Elite 200 V2 and Anker 9W for the C2000 Gen 2. If you keep a Mega 2 for outages, top it up every few weeks or leave it plugged in.

Performance

AC output and the TT-30R outlet

The 2,500W inverter runs a fridge, microwave, coffee maker or a 1/2 HP sump pump (about 2,150W to start) one at a time. Surge is where the two models differ. OUPES rated the original at 5,400W, but The Solar Lab found it handled only very brief spikes and shut off at once under a steady 3,000W load. The Mega 2 Pro claims less: a 3,800W peak and a 3,600W Boost Mode that the app holds for five minutes. Both are 120V only; for a 240V well pump, look at the OUPES Guardian 6000 V2.

The TT-30R is why RV owners shortlist this unit. It takes a standard 30A RV plug, but the inverter still stops at 2,500W, not the 3,600W a 30A, 120V circuit can carry, so run the roof air or the microwave, not both. A 13,500 BTU roof AC runs at about 1,800W and needs about 2,800W to start; Micro-Air says a soft starter lets a 2,000W generator start one, and fitting one takes the strain off a 2,500W inverter too. Our full-time RV power setup guide covers sizing a whole rig.

Solar charging

The original Mega 2's 2,100W solar rating needs a string near 140V at a full 15A. That is hard to build from portable panels without passing the 148V limit on a cold morning, when panel voltage rises. OUPES's own Mega 2 Pro FAQ concedes the point: five of its 240W panels in series (1,200W on paper) give about 1,000W in practice. The Solar Lab got about 800W from four 200W panels.

The Mega 2 Pro rates its input at 1,000W, 12 to 80V and 30A, which suits lower-voltage strings. OUPES suggests six of its 240W panels wired three in series and two in parallel (about 74V open-circuit), which it says hold a steady 1,000W and refill the battery in about 2 hours. Two catches: the Pro's single Anderson port is either the solar input or the 1,000W DC output, set by a slide switch, and the solar adapter cables are not in the box. Adding a B2 battery gives either model a second, independent solar input of up to 2,100W. Our guide to how many solar panels a power station needs covers string sizing.

Wall charging and pass-through

From the wall, the original draws up to 1,600W: The Gadgeteer timed 20 to 95% in about an hour and a full charge in 1 hour 15 minutes, while The Solar Lab's full charge took 2 hours 7 minutes. The Mega 2 Pro draws up to 1,800W, which its Amazon listing says fills it in 70 minutes, or about 50 minutes with solar added. A rear switch picks fast or adjustable charging; the manual recommends the default speed unless you need the fast one, and on a shared 15A circuit you should slow it down.

Both models pass power through while charging and switch to battery in 20ms or less when the grid drops, for loads up to 2,500W. That suits a fridge, router or CPAP, but it is slower than the 10ms Anker quotes for the C2000 Gen 2 and EcoFlow's under-10ms for the DELTA 3 Max, and a desktop PC may restart on a 20ms gap. OUPES's FAQ adds that in bypass mode, AC charging plus every output must stay under 2,400W.

App and smart features

Both connect to OUPES's app over 2.4GHz Wi-Fi or Bluetooth to show input and output, switch ports on and off and set charge limits. The Pro adds over-the-air firmware updates, scheduled charging for time-of-use rates, a backup reserve from 25 to 85% and the Boost Mode switch. Its "save up to $417 a year" claim assumes a B2 battery cycled every night across a 25-cent gap between peak and off-peak prices, plus five hours a day of 480W solar.

Expansion: the B2 Extra Battery

The OUPES B2 Extra Battery adds 2,048Wh at 41.8 lb, and was $799 on Amazon, sold by OUPES and in stock, on November 10, 2026: about $390 per kWh. Up to four connect to either Mega 2 for 10.24kWh. One B2 doubles every runtime above, to about 2.3 days of fridge or 23 hours of the 150W essentials load. Each B2 has its own 2,100W solar input, so every battery you add is also another charge controller. Output stays at 2,500W however many you add. The B2 also fits OUPES's Mega 1 and Mega 3.

Build and design

The two weigh 48.5 lb (Mega 2) and 48.8 lb (Mega 2 Pro), a two-handed carry in The Solar Lab's words, and the Pro's case is an inch deeper at 11.6 in. The Solar Lab described the original's fan as a medium hum, about like a loud desktop computer fan. Both are rated IP21, which covers dripping water but not rain, and to run only from 32°F to 104°F, so in winter keep them in a heated space. OUPES lists only UN38.3 (a battery transport test) and an MSDS for either model, with no UL safety listing.

How the OUPES Mega 2 compares with other 2kWh power stations

Model	Capacity	AC output	Solar input	TT-30R	Expands to	Weight	Price (November 10, 2026)
OUPES Mega 2 Pro	2,048Wh	2,500W	1,000W	Yes	10.24kWh	48.8 lb	$1,599 list; sold out at OUPES and Amazon
OUPES Mega 2	2,048Wh	2,500W	2,100W rated	Yes	10.24kWh	48.5 lb	$1,499 list; sold out at OUPES
Anker SOLIX C2000 Gen 2	2,048Wh	2,400W	800W	Yes	4,096Wh	41.7 lb	$949.99 on Amazon (ships later)
BLUETTI Elite 200 V2	2,073.6Wh	2,600W	1,000W	No	Not expandable	53.4 lb	$898.99 on Amazon
EcoFlow DELTA 3 Max	2,048Wh	2,400W	500W	No	Not expandable	44.8 lb	$878.99 on Amazon
EcoFlow DELTA 2 Max	2,048Wh	2,400W	1,000W	No	6,144Wh	50 lb	$1,028.99 on Amazon

Amazon prices change daily. At the $649 OUPES charged in April, the Mega 2 undercut all four rivals by $230 or more, and it was the only one with both an RV outlet and expansion to 10kWh. At list price, both OUPES units cost more than any of the four.

Until OUPES restocks, the Anker SOLIX C2000 Gen 2 is the closest match: a TT-30R, expansion to 4,096Wh and a 10ms UPS at 41.7 lb. Pick the BLUETTI Elite 200 V2 for its 6,000-cycle rating, the DELTA 3 Max for the lowest price, or the DELTA 2 Max for 1,000W of solar and expansion to 6,144Wh. To stay with OUPES, its Mega 1 and B2 kit (3,072Wh, 2,000W) was $1,299 on Amazon and in stock.

What we like

• A 30A TT-30R RV outlet and four 20A outlets on a 2kWh unit
• Expands to 10.24kWh with B2 packs, each adding its own 2,100W solar input
• 2,500W continuous, more than the 2,400W of the Anker and EcoFlow 2kWh units
• OUPES's sale price worked out to about $317 per kWh, under any big-brand rival
• Five-year warranty, six with registration

What we don't like

• Both models marked sold out at OUPES on November 10, 2026, and the Amazon listing out of stock
• The original's 5,400W surge claim did not hold under a 3,000W load in The Solar Lab's test
• The original's 2,100W solar rating works out to about 1,000W with OUPES's panels; the Pro is rated 1,000W
• 20ms UPS switchover, slower than the 10ms Anker and EcoFlow quote
• No UL listing, no published idle draw, and an idle drain The Solar Lab called faster than usual

Who should buy the OUPES Mega 2

Buy it if you find a Mega 2 or Mega 2 Pro in stock well under $1,000 and you want a TT-30R for a travel trailer, room to grow to 10kWh of battery, or 2,500W for a microwave or coffee maker during an outage.

Skip it if you need 240V for a well pump or dryer (the Guardian 6000 V2 has it), a sub-10ms UPS for a desktop PC (the C2000 Gen 2 or DELTA 3 Max), or the most charge cycles for daily use (the Elite 200 V2's 6,000). Our expandable power station guide compares other routes to a bigger battery bank, and our best power stations under $1,000 covers the in-stock 2kWh picks.

OUPES Mega 2: final verdict

The OUPES Mega 2 earned its following on price: 2,048Wh, 2,500W, a 30A RV outlet and 10kWh of expansion for about $650 during OUPES's usual sale. Its surge and solar ratings were optimistic, and the Mega 2 Pro that replaced it in April 2026 trades the big solar number for a 1,000W DC port and a more modest 3,800W peak. With both sold out at OUPES and the Pro out of stock on Amazon on November 10, 2026, buy a Mega 2 or Mega 2 Pro only when one returns under $1,000. Until then, the Anker SOLIX C2000 Gen 2 is the closest in-stock match.

OUPES Mega 2 ProCheck price on Amazon

With the Mega 2, Mega 3 and Mega 5 all sold out at OUPES, our OUPES lineup guide covers the models it still stocks, including the Mega 1 and Mega 1 Lite.

Related reading: OUPES Guardian 6000 V2 review · Anker SOLIX C2000 Gen 2 review · Full-time RV power setup · Best expandable power stations