Product comparison · Portable Stations
OUPES Mega 3 vs FOSSiBOT F3600 Pro
The OUPES Mega 3 scores 6.9 and ranks 14th of 64 in Portable Stations; the FOSSiBOT F3600 Pro scores 6.3 and ranks 37th of 64 in Portable Stations. The Mega 3 leads on recharging, the F3600 Pro on capacity.
All 7 OUPES products 
OUPES Mega 3
$1,199 · 14th of 64 in Portable Stations
Buy Now- Recharging — 8 against 4
- Battery Life — 6 against 4
6.9
6.3
All 4 FOSSiBOT products 
FOSSiBOT F3600 Pro
$1,259 · 37th of 64 in Portable Stations
Buy Now- Capacity — 10 against 7
- Backup Readiness — 7 against 6
Across everything we scored, OUPES Mega 3 sits 0.67 ahead — led by recharging.
Verdict
Mega 3 ahead · +0.67 (6.9 vs 6.3)Pick the OUPES Mega 3 when
Recharging matters8vs4
Battery life matters6vs4
Pick the FOSSiBOT F3600 Pro when
Capacity matters10vs7
Backup readiness matters7vs6
A faster backup switchover matters10 ms or lessvs11-20 ms
Scored 10 October 2026 from published specs and owner reviews. We don't buy or test units. How we score
Most common complaints
From each product's own owner reviews and retailer ratings.
OUPES Mega 3
- B2 battery stopped charging from the station, per one owner
- Barely handled loads above 3,600 W, per one reviewer
- Recovery charge needed after a full drain, per one channel
FOSSiBOT F3600 Pro
- Full wall charge took 3 hours 36 minutes, per one reviewer
- Screen failed and the unit had to be replaced, per one channel
- Held back from top picks by its 92.59 lb weight, per one reviewer
Where the OUPES Mega 3 and FOSSiBOT F3600 Pro differ
Scores on a 0–10 scale. Each row is one criterion, biggest difference first.
Recharging
+4 OUPESBattery Life
+2 OUPESBackup Readiness
+1 FOSSiBOTPower Output
tiedVerification
tiedWarranty & Support
tiedValue
one side unscoredWhat OUPES Mega 3 and FOSSiBOT F3600 Pro owners report
Independent sources, scored for each model. Mega 3 on 5 of five, F3600 Pro on 4.
The FOSSiBOT F3600 Pro reading covers the whole brand.
What they say
OUPES Mega 3
- Owner posts on the Mega 3 sit in r/OUPES_info, a user-run subreddit, from July and August 2026.
- One owner's B2 battery, which worked over the winter, stopped charging from the Mega 3.
- Another reported a Mega 3 that would not recharge after a full discharge, the E022 fault other Mega owners describe in the same thread.
- A third, who owns a Mega 3 and a Guardian 6000, called OUPES support fantastic on the few issues raised.
FOSSiBOT F3600 Pro
- No owner thread in an independent subreddit reports on the F3600 Pro, only a buyer in r/OffGridLiving asking whether a 2 kW inverter generator would charge it safely (March 2025), so this reads the brand.
- In r/SolarDIY an F800 owner's startup screen froze and stayed frozen while the unit ran (2026).
Both readings are about these exact models.
What they say
OUPES Mega 3
- TheSolarLab, which earns affiliate commission and offers a discount code, drew 86 percent of rated capacity at about 2,968 W, recharged it on AC from 2 to 100 percent in just over two hours, found it barely handled loads above 3,600 W despite the 7,000 W surge rating, and faulted a peak-shaving feature it could not find in the app and the hard plastic wheels, while praising 20 A on every AC outlet, the included cables and OUPES phone support.
- An owner on DIY Solar Power Forum reported a Mega 3 with two B2 batteries working well for eight months.
- An RV owner on iRV2 ran every 12 V load in a trailer from its Anderson output (May 2024).
FOSSiBOT F3600 Pro
- CNET, which earns commission through its FOSSiBOT store links, measured 89 percent of rated capacity (December 2025) and, in a later test, a full wall charge of 3 hours 36 minutes, 77.84 percent round-trip efficiency and 44 hours 39 minutes on its test fridge with a 26.11 percent overhead loss, naming it an honorable mention held back by its 92.59 lb weight and charge time (September 2026).
- Basic Tutorials, which passes on a Geekbuying voucher code, charged the 230 V EU model to full in about two hours at 2,200 W, ran a 2,200 W angle grinder and heard the fans only at high input or output (September 2024).
- Guru3D, which tested a unit from FOSSiBOT, filled the EU model from 400 W of solar in under 9 hours and found the BrightEMS app worked over Bluetooth and Wi-Fi (August 2025).
YouTube
+2 OUPESBoth readings are about these exact models.
What they say
OUPES Mega 3
- AVERAGE JOE, which links to OUPES and passes on an OUPES discount code, drew 2,708 Wh at about 617 W, 88 percent of rated, held about 3,570 W with a B2 battery attached, started a 10-inch miter saw and an air compressor, and saw a slight light flicker on UPS switchover (May 2024, about 10,000 views).
- Porter Creek, which links an OUPES discount code, used one daily for a year, praised the solar input on each B2 battery and the features added to the app, and disliked the recovery charge needed after a full drain and a stock AC cord that ran warm (March 2025, about 12,500 views).
- Our Everyday Homestead, which uses affiliate links, ran about 3,200 W of heaters without a shutdown (November 2023, about 10,000 views).
FOSSiBOT F3600 Pro
- Every channel carries a FOSSiBOT tie.
- ReeWray Outdoors, which said FOSSiBOT was not paying for the review but whose FOSSiBOT F1800 video is a paid FOSSiBOT promotion with an affiliate link, drew 3,682 Wh from the AC inverter at about 858 W, 96 percent of rated, read 119.9 V at the outlets, measured about 50 W of idle draw with the inverter on, and could not connect the unit to the BrightEMS app (August 2025, about 110,000 views).
- The Old Jarhead, which passes on FOSSiBOT coupon codes and links, had its first unit's screen fail, waited over two months for FOSSiBOT's replacement, and ran the replacement at 2,500 W and more without trouble (January 2026, about 5,500 views).
Amazon
+2 OUPESThe FOSSiBOT F3600 Pro reading covers its product line.
What they say
OUPES Mega 3
- The station listing (B0CS6CNM8L), model S3, reads 4.3 from 35 ratings.
- A separate kit listing with two panels (B0CF26N2QK) reads 3.9 from 5 ratings, under the ten-review floor.
FOSSiBOT F3600 Pro
- FOSSiBOT's F3600 Pro listings on Amazon US share one review file across the station and its solar-panel kits: the F3600 Pro and 420 W panel kit (B0HBBQN891), sold by HK Hongli Tech, reads 4.4 from 28 ratings, 78 percent five-star and 9 percent one-star, and the station listing (B0GXYQW3JL) shows the same 4.4 from 28.
Owner reviews
one side unscoredThe OUPES Mega 3 reading covers its product line; no usable source for the FOSSiBOT F3600 Pro.
What they say
OUPES Mega 3
- No US retailer lists the Mega 3 with a review: Walmart's Mega 3 listings are gone, and Lowe's Mega 3 page carries no reviews.
- This reads the Mega 1 and Mega 1 Lite file on Walmart (item 11344470227), sold by OUPES's own store, which shares the Mega series app and B2 expansion battery with the Mega 1: 4.3 from 136 ratings, 4.3 from 132 with Walmart's four incentivized reviews set aside.
- Owners praise the fast wall charge and overnight refrigerator runtime, against units that died after a full discharge and app dropouts.
FOSSiBOT F3600 Pro
No usable source.
OUPES Mega 3 vs FOSSiBOT F3600 Pro: pros and cons
What each one does well, and where it falls short.
OUPES Mega 3
Strengths
- 3,600 W continuous from five 20 A outlets and a TT-30R
- 2,100 W solar input at 12 to 148 V
- 86 to 88 percent usable on AC in two testers' runs
- Expands to a rated 15.36 kWh with six B2 batteries
- Each B2 battery takes its own 2,100 W of solar
- Held about 3,570 W with a B2 attached in AVERAGE JOE's test
Drawbacks
- 120 V onlyand two units cannot be paired
- UPS mode covers loads up to 2,200 W only
- Barely handled loads above 3,600 W in TheSolarLab's test despite a 7,000 W surge rating
- No OUPES transfer switchthe product page points to a third-party kit
- OUPES publishes its charge time four ways: 0.81, 1.7 and 1.8 hours
- 83.3 lb on hard plastic wheels
FOSSiBOT F3600 Pro
Strengths
- 3,600 W continuous with a 7,200 W surge
- UPS switchover within 10 ms
- Takes up to two FB3840 batteries11,520 Wh in all
- Up to 2,000 W of solar input at 12 to 160 V
- 3,500 W of combined AC and solar inputfull in 1 hour 50 minutes by FOSSiBOT's figure
- CNET measured 89 percent of rated capacityDecember 2025
- Wheels and a retractable handle
Drawbacks
- The US spec table rates 6,500+ cycles to 50 percent of original capacity; the page copy gives no end point and FOSSiBOT's global page bullet says to 80 percent
- AC input capped at 1,500 Wand CNET measured a full wall charge of 3 hours 36 minutes (September 2026)
- The US page claims a full solar charge in 2 hoursits spec table gives about 2.5 hours
- FOSSiBOT sells no transfer switch for itand two units cannot be linked for more power or 240 V
- UPS loads capped at 2,500 W on the US version by FOSSiBOT's global FAQ
- "Certified Safe" on the US pagewhich lists only FCC, CE, PSE, RoHS, UN38.3 and MSDS
- 92.6 lb
- FOSSiBOT's US warranty policy covers only orders placed on us.fossibot.com and states no term for a unit bought on Amazon or Walmart
OUPES Mega 3 vs FOSSiBOT F3600 Pro: the numbers
Price, scores and rank, then only the specs that differ. Green marks the side with more.
- Rated cyclesOUPES3,000-3,999 cyclesFOSSiBOT More6,000 cycles or more
- Backup switchoverOUPES11-20 msFOSSiBOT More10 ms or less
- WeightOUPES83.3 lbFOSSiBOT92.6 lb
Same on both
- 3,000-3,999 WhCapacity
- 3,000-3,999 WAC output
- 120 V onlyOutput voltage
- LiFePO4Battery chemistry
- 2,000-3,999 WSolar input
- 10-19.9 kWhExpandable to
- None verifiableSafety listings
- 5 YearsWarranty
We earn a commission if you buy through these links. It never changes a score.
Not sold on either one?
The top-scored and the cheapest other pick from each brand.
More from OUPES 5 scored in Portable Stations
What’s different
- Capacity: 1,000-1,499 Wh, not 3,000-3,999 Wh
- AC output: 2,000-2,999 W, not 3,000-3,999 W
Pick it ifRecharging matters10vs8
What’s different
- Capacity: 450-699 Wh, not 3,000-3,999 Wh
- AC output: Under 1,000 W, not 3,000-3,999 W
Pick it ifBattery life matters8vs6
More from FOSSiBOT 2 scored in Portable Stations
What’s different
- Capacity: 1,000-1,499 Wh, not 3,000-3,999 Wh
- AC output: 1,500-1,999 W, not 3,000-3,999 W
Pick it ifBattery life matters8vs4
OUPES Mega 3 vs FOSSiBOT F3600 Pro: common questions
Is the OUPES Mega 3 better than the FOSSiBOT F3600 Pro?
On our scores, the OUPES Mega 3 is ahead, 6.9 against 6.3. The OUPES Mega 3 leads on recharging (8 against 4) and battery life (6 against 4). The FOSSiBOT F3600 Pro leads on capacity (10 against 7) and backup readiness (7 against 6).
What do owners say about the OUPES Mega 3 and the FOSSiBOT F3600 Pro?
Across 4 independent sources scored for both, the OUPES Mega 3 is ahead on Reddit, YouTube and Amazon; Google is level.
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Scores calculated 10 October 2026 · Products excluded where fewer than two independent sources cover them · · How we score