Head-to-head test
Anker SOLIX C300 vs BLUETTI AC50B
Divide either price by its watt-hours and the $399 AC50B is the cheaper box, not the $330 C300 — so unless you specifically want a featherweight dual-140W USB-C charger, the bigger BLUETTI is the small station to buy.
Full profiles: Anker SOLIX C300 → · BLUETTI AC50B →
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
$329.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
$399.00 · direct from BLUETTI
Last checked 1 day ago. Prices move — check before you buy.
Spec deltas
The $399 AC50B is the cheaper power station. Not on the shelf — the C300 undercuts it by $69 there — but on the division that matters once you're storing energy: $0.89 a watt-hour against $1.04, and $0.30 per lifetime kilowatt-hour against $0.35. The more expensive box holds 56% more capacity, and that extra capacity costs less per watt-hour than either unit's own average.
Output is where the gap turns physical. The AC50B runs 700W continuous against the C300's 300W, starts a bigger surge (1,000W vs 600W), and is the only one of the two that covers a 320Wh CPAP night. The C300's 300W ceiling isn't a power-station rating so much as a device-charging budget.
The C300 earns its place for one specific buyer: the person whose 'power station' is really a laptop-and-camera charger. Its dual 140W USB-C portsA1 charge two laptops at full speed where the AC50B's 65W would throttle one, and at 9.1 lbs it's 5.7 lbs lighter in the bag. If you're not plugging into the AC outlets, the C300 is the smarter, lighter, cheaper buy. If you are, it's the AC50B.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
On every per-energy measure — cost per watt-hour today, cost per lifetime kilowatt-hour over 3,000 cycles — the AC50B is the cheaper box. The C300's lower sticker is the single number on which it's the cheaper unit, and it stops being true the moment you divide by capacity.
AC50B: $399 for 448Wh ($0.89/Wh)SOLIX C300: $330 for 288Wh ($1.04/Wh)Cheaper to own: AC50B at $0.30 per lifetime kWh vs C300 at $0.35
Why it mattersIf you're buying stored energy, the AC50B is the value pick; the C300 only looks cheaper until you do the division.
continuous output
A motor or a heating element draws watts at switch-on, not a multiple of someone's rating, so what starts a real appliance is the absolute surge ceiling: 1,000W on the AC50B against 600W on the C300. The AC50B both starts a 400W blender or a small fridge and runs it at 700W continuous; the C300 might start it and then fold.
SOLIX C300: 300W continuous, 600W surgeAC50B: 700W continuous, 1,000W surgeTailgate 400W peak: C300 starts it on surge but can't hold it at 300W continuous; AC50B sustains it
Why it mattersAnyone who'll plug in something that draws real watts — not just phones and laptops — is ruled out of the C300 by its 300W rating before capacity ever enters the conversation.
That's the CPAP buyer's actual trade. The C300 is the one that sits at a listed 25dB eighteen inches from your head, but on a humidified load it can die before your alarm. The AC50B gets you to morning, though its 45dB listed floor is closer to a running fridge. A low-draw CPAP that fits under 245 usable watt-hours flips it back to the silent C300.
CPAP night modeled at 320WhC300: 245Wh usable (85% of 288Wh) — 75Wh short, about 76% coveredAC50B: 381Wh usable (85% of 448Wh) — finishes with 61Wh to spareListed noise floor: C300 25dB, AC50B 45dB
Why it mattersHumidifier on, or any draw near 320Wh: buy the AC50B, because finishing beats quiet. Humidifier off and a genuinely low draw: the C300 is the better bedside unit.
weight
For the buyer whose power station is really a charger, the C300 is purpose-built: full-speed USB-C for a modern laptop, and 5.7 lbs less to carry than the AC50B. Every watt-hour of the AC50B's capacity edge is dead weight to someone who never touches the AC outlets.
C300: dual 140W USB-C portsA1AC50B: 65W max USB-CWeight: C300 9.1 lbs vs AC50B 14.8 lbs
Why it mattersUSB-C-first, weight-first buyers should take the C300 and keep the $69 — the AC50B's advantages all live behind AC outlets they won't use.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: The verdict turns on cost per watt-hour: the AC50B is $0.89/Wh and $0.30 per lifetime kWh against the C300's $1.04 and $0.35, so the pricier box is the cheaper energy.
cost / lifetime kWh
Both units are rated for 3,000 cycles, so lifetime comes down to how much energy each moves per cycle — and the AC50B moves more. Its 448Wh over 3,000 cycles works out to 1,344 lifetime kilowatt-hours against the C300's 864, and because you paid $399 rather than $330 for that larger pack, the cost lands at $0.30 per lifetime kWh versus $0.35. The bigger battery is the cheaper one to feed.
The $69 gap on the shelf is the C300's only price win, and it's a real one if $330 is a hard ceiling. But it buys a smaller battery that costs more per watt-hour — the opposite of a bargain if you'll actually cycle it.
Your Life, Your Pick
Selected because: What each can actually run: the AC50B covers a 320Wh CPAP night and the C300 doesn't, and its 700W handles loads the C300's 300W won't.
Size sets the ground rules: neither unit is a whole-house or camping-weekend battery, and the scenario table is blunt about it — both come up thousands of watt-hours short of a 2,100Wh camping weekend or a 1,645Wh blackout. At this class you're powering a device list, not a breaker panel.
Where they diverge is the CPAP night. The AC50B's 381 usable watt-hours clear the 320Wh load with 61 to spare; the C300's 245 usable leave it 75Wh short, dark around 76% of the way through. And at a 400W tailgate surge the AC50B holds the load while the C300 starts it and stalls. The only scenario either wins outright, it's the AC50B.
Portability & Form Factor
Selected because: The C300's whole case: 9.1 lbs vs 14.8, and dual 140W USB-C against the AC50B's 65W, for the buyer charging devices rather than running appliances.
weight
The C300 is the one you forget you're carrying: 9.1 lbs against the AC50B's 14.8, a 5.7-lb difference you feel on a trailhead or a third-floor walk-up. Anker built it to disappear into a daypack, and reviewers single out the compact, light build for exactly thatA1A2.
Portability is also where the C300's port choice pays off. Dual 140W USB-CA1 charges laptops as fast as a wall brick, from two ports at once, while the AC50B's 65W USB-C throttles a modern laptop. If your load rides on USB-C and lives in a bag, the lighter unit is also the more capable one — the only section where that's true.
What the Specs Don't Tell You
Selected because: The tiebreakers split: the C300 takes UPS speed (≤10ms vs ≤20ms) and the quieter listed floor, the AC50B the higher 1,000W surge ceiling.
The fine print splits, and mostly toward the C300. It's rated ≤10ms on UPS switchover against the AC50B's ≤20ms — treat both as ratings, not stopwatch readings, but the tighter class is the safer bet for a desktop PC with unsaved work. Its listed noise floor is 25dB to the AC50B's 45dB, the difference between near-silent and refrigerator-adjacent, which matters most at the low CPAP-style loads that floor describes.
The AC50B's win in the fine print is the one that starts appliances: a 1,000W absolute surge ceiling against 600W. The C300 holds the higher surge ratio (2× its rating vs 1.4×), but a fridge compressor draws a fixed spike at startup, not a multiple of the C300's smaller rating — so the AC50B swallows a bigger real-world inrush despite the lower ratio.
Brand Trust
Selected because: Both apps rate 4.5/5; the real difference is support — Anker US-based but reportedly slipping, BLUETTI inconsistent but better if you buy direct.
The apps are a wash — both rate 4.5/5, among the best in the category — so the brand question is really a support question. Anker's is US-based and historically excellent, though its SOLIX support has been slipping, with AI-driven first-line agents and hazmat return logistics on heavier units, so the brand's reputation now runs a step ahead of the SOLIX experience. BLUETTI's is the most inconsistent in the space, email-based with timezone delays, and the one reliable lever is buying direct from BLUETTI rather than a third party.
At $330 to $399, neither support story is a reason to override what the specs say. But if you want a human on the phone quickly, Anker still has the edge.
Strengths & trade-offs
Anker SOLIX C300
Strengths
- +Costs $69 less
- +Lighter by 5.7 lb
Trade-offs
- –No major technical downsides compared to rival.
BLUETTI AC50B
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –No major technical downsides compared to rival.
Will It Power Your Gear?
Scenario math and per-appliance runtimes, modeled from the spec record.
Scenario verdicts
We ran the math on seven real-world scenarios. Here's which unit survives your actual life.
SCN-01 · 2 nights · needs 2,100Wh
Weekend Camping
Two nights off-grid with essential comfort
Neither unit
Neither unit covers this scenario's 2,100Wh: the SOLIX C300 comes up 1,855Wh short (about 12% covered), the AC50B 1,719Wh (18%). This is well outside what either unit is for; the right answer here is a larger station, not a choice between these two.
Battery budget usedlower = more headroom
LOAD Phone Charger 15W×6h · LED Lights 40W×8h · Box Fan 75W×14h · CPAP Machine 40W×16h
SCN-02 · 8 hours · needs 1,645Wh
8-Hour Blackout
Keep the essentials running through a night without power
Neither unit
Neither unit covers this scenario's 1,645Wh: the SOLIX C300 comes up 1,400Wh short (about 15% covered), the AC50B 1,264Wh (23%). This is well outside what either unit is for; the right answer here is a larger station, not a choice between these two.
Battery budget usedlower = more headroom
LOAD Fridge 150W×8h · Router + Modem 20W×8h · LED Lights (4 bulbs) 40W×6h · Phone Charger 15W×3h
SCN-03 · 8 hours · needs 320Wh
CPAP Overnight
Sleep therapy without interruption — the #1 medical use case
AC50B
This is the one head-to-head either unit wins outright, and it goes to the AC50B. At the 320Wh we model, its 381 usable watt-hours finish the night with 61 to spare; the C300's 245 usable leave it 75Wh short and dark around three-quarters of the way through. The catch runs the other way on noise — the C300's listed 25dB floor is the quieter one to sleep beside, against the AC50B's 45dB — so if your CPAP draws little enough to fit under 245Wh, the silence tips it back. For a humidified machine near 320Wh, capacity wins: take the AC50B.
Battery budget usedlower = more headroom
LOAD CPAP Machine 40W×8h
SCN-04 · 8 hours · needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
Neither unit
Neither unit covers this scenario's 910Wh: the SOLIX C300 comes up 665Wh short (about 27% covered), the AC50B 529Wh (42%). Treat this as partial cover — enough for the essentials in it, not the whole list.
Battery budget usedlower = more headroom
LOAD Laptop 60W×8h · External Monitor 30W×8h · Router + Modem 20W×8h · Phone Charger 15W×2h
SCN-05 · 4 hours · needs 670Wh
Tailgate Party
Game day power for the crew
Neither unit
The SOLIX C300 can start the 400W peak but not hold it — 600W of surge gets it going, then the 300W continuous rating takes over, so capacity never gets a say. This is the wrong size of unit for the job rather than a close call. The AC50B doesn't have the energy either — 381Wh usable against 670Wh, 289Wh short — so neither route works.
Battery budget usedlower = more headroom
LOAD Blender 400W×0.5h · LED TV (55") 80W×4h · Bluetooth Speaker 15W×4h · Phone Charger (×3) 45W×2h
SCN-06 · 24 hours · needs 4,685Wh
Van Life Daily
A full day of mobile living — the ultimate endurance test
Neither unit
Neither unit covers this scenario's 4,685Wh: the SOLIX C300 comes up 4,440Wh short (about 5% covered), the AC50B 4,304Wh (8%). This is well outside what either unit is for; the right answer here is a larger station, not a choice between these two.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
SCN-07 · an afternoon · needs 100Wh
Afternoon Off-Grid
Phones and a speaker at the park, beach, or campsite — the small-unit job description
Either unit
This is the job small stations are actually for, and both do it: the SOLIX C300 finishes at 41% used, the AC50B at 26%. At this size the decider is what rides in the bag — 9.1 lbs for the SOLIX C300 against 14.8 for the AC50B — and price, not the leftover watt-hours.
Battery budget usedlower = more headroom
LOAD Phone Charger (×2) 30W×2h · Bluetooth Speaker 10W×4h
The Load Test
RUNTIME = (Wh × 0.85) ÷ LOAD
None of the scenarios above exactly yours? Build it. Toggle what you'd plug in; both units are tested against the combined draw.
Essentials
Comfort & Convenience
High-Draw Appliances
Test duration
8h
Continuous draw
205W
Projected runtime
For this load: AC50B runs 1.9h vs 1.2h.
$399 list · direct from BLUETTI
Modeled from the spec record — same math as the tables below. Methodology
Runtime by appliance
Real-world runtime estimates for common appliances, modeled at 85% inverter efficiency.¹
Essentials
The basics you need runningscale 0–25.4hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–5.1hHigh-Draw Appliances
These reveal the real limits¹ Runtime = (capacity × 0.85) ÷ appliance watts. Within each group, all bars share one time scale (the group's longest runtime), so lengths are comparable across appliances; identical runtimes collapse into a single blue/orange bar. Actual runtime varies with battery age, temperature, and simultaneous loads — see methodology.
Conclusion
August 30, 2026
Verdict: the BLUETTI AC50B
Take the AC50B unless you're buying a USB-C charging brick. It costs $69 more than the C300 but less per watt-hour ($0.89 vs $1.04) and less per lifetime kilowatt-hour ($0.30 vs $0.35), while holding 56% more capacity (448Wh vs 288Wh) and putting out more than twice the continuous power (700W vs 300W). It's also the only one of the two that covers a 320Wh CPAP night. The C300 wins on weight (9.1 vs 14.8 lbs), dual 140W USB-C charging, a tighter UPS rating (≤10ms vs ≤20ms), and a quieter listed noise floor — a real package for a device-charging, ultralight buyer, but a narrower one than the AC50B's.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of August 30, 2026. The links below open Anker's and BLUETTI's current prices.
$399.00 · direct from BLUETTI
Last checked 1 day ago. Prices move — check before you buy.
or check the SOLIX C300 price$329.99 list
Written by Wenny Zheng, Portable Power Tester · Station Arena Test Desk · Updated August 30, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): Solar Generator, Tailgating.
Full specifications
ᵈ Derived: price ÷ rated capacity. See the data behind our comparisons →
Comparison ToolAdd more power stations, side by sideOpen Tool →How these numbers are produced
Numeric verification
Every figure on this page traces to our spec database or arithmetic on it — no estimated numbers.
Owner claims
Statements about owner experience are cited to published reviews — see Sources & Research Notes below.
Runtime model
Runtime = (rated capacity × 0.85 inverter efficiency) ÷ device wattage. Solar recharge estimates assume panels deliver 70% of rated output. Cold weather, battery age, and stacked loads reduce real-world results.
Power Score
Computed from 14 published spec dimensions, weighted per use-case bench. Higher is better; a unit must meet a bench's minimum threshold to be rated.
See the full weight table and data sourcing on our methodology page →Class ranking (the star rating)
Each unit's star score is a category ranking, not customer reviews — no buyer opinions feed it. We score every station on size-independent quality (value, output, portability, endurance, ports, warranty, and more), then percentile-rank it against the other units in its capacity class, so a class-leading compact unit and a class-leading whole-home unit can both earn 5★. Here, SOLIX C300 rates 4.2/5 (52nd percentile of 22 Personal-class units), and AC50B rates 4.6/5 (76th percentile of 22 Personal-class units).
How the class ranking is computed →Test Notes & Caveats
Hidden gotchas and advantages we spotted that you won't find on the product page.
The AC50B is the louder box
Its listed 45dB floor sits about where a running refrigerator does; the C300's 25dB is the one you can sleep next to. Both are best-case manufacturer figures that climb under load, so read them as a class gap, not a measurement — but at the low, quiet loads where the floor is closest to real, the C300 is genuinely the quieter unit. If a silent bedside is the priority, this is the row the C300 wins.
Ceiling beats ratio for starting things
The C300 keeps the higher surge ratio — 2× its rating against the AC50B's 1.4× — but the AC50B holds the higher absolute ceiling, 1,000W to 600W. A compressor or pump draws a fixed spike at switch-on, not a multiple of whichever rating you own, so the number that decides whether a load starts is the ceiling. On raw starting muscle the AC50B is the stronger unit; the C300 is the one idling further below its own smaller limit.
The C300 has the tighter UPS rating
≤10ms on the C300 against ≤20ms on the AC50B. Both are ratings rather than stopwatch readings, and both are quick enough on paper for routers and most electronics — but the fussiest desktop PC power supplies sit right around the 20ms line. If a home-office PC with unsaved work is the thing you're protecting, the C300's tighter class is the one to trust.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here. The AC50B's figure is a maximum rather than a guarantee — it depends on buying direct from BLUETTI or registering the unit, since reseller purchases carry a shorter term.
Full record above — the Test Desk pick is the AC50B.
Check AC50B price →or check the SOLIX C300 priceOwnership Analysis
What happens after you buy — true cost of ownership, brand trust, and growth potential.
Lifetime value
Service lifeyears at one full cycle per day
Lifetime energy delivered
Cost per delivered kWh
│ warranty ends · Reaching the cycle rating means ~80% capacity remains — degraded, not dead.
Analyst note
The SOLIX C300 is cheaper to buy, but the AC50B is cheaper to own. At $0.3/kWh over its lifetime vs $0.38/kWh, the AC50B's higher cycle life and capacity make each dollar go further over the years. One thing to know reading the table: both carry the same 3,000-cycle rating, so the lifetime rows are sticker price and capacity in disguise — the wear horizon is identical and decides nothing here.
Brand trust
Anker
Ecosystem
7-8 SOLIX portable power stations across C-series (compact) and F-series (flagship), plus the X1 home energy system
Support
US-based, and historically a no-hassle-replacement standout — but SOLIX support has been slipping, with AI-driven first-line agents and hazmat return logistics on heavier units. The Anker name still carries trust; the SOLIX experience now runs a step behind it.
Community
Moderate — active Reddit (r/Anker, r/AnkerSOLIXCommunity) and growing. Benefits from Anker's massive consumer electronics brand awareness.
App experience
Rated 4.5/5 iOS (~1,100 ratings) · 4.3/5 Android
Unique strength
Parent-brand trust from Anker's consumer-electronics business, and InfiniPower cells built for long cycle life. Anker's mid-size and larger stations are among the better per-watt-hour buys in the catalog.
Worth knowing
Firmware updates have removed features without warning, and the expansion ecosystem is smaller than some rivals'. At the C300's size, neither is likely to bite.
BLUETTI
Ecosystem
One of the broadest lineups — 15-20+ models from budget (AC2A) to flagship portable (Apex 300, 2764.8Wh). Includes specialized products: vehicle solar hubs, sodium-ion cold-weather units, and balcony storage systems.
Support
The most inconsistent in the category — email-based, with timezone delays, and outcomes that swing from smooth to weeks of runaround. The one reliable lever is buying direct from BLUETTI rather than a third-party seller.
Community
Active and growing — Reddit r/bluetti has a dedicated community. Second-largest after EcoFlow in engagement.
App experience
Rated 4.5/5 iOS and Android — tied for best app experience in the category. V3.0 UI redesign was well-received.
Unique strength
Among the best capacity-to-price ratios you can buy, and the widest lineup in the space — from budget units to sodium-ion cold-weather models. Full LFP standardization across the range.
Worth knowing
Support inconsistency is the real risk here, and some older or discontinued units can become hard to repair. Buying direct and registering is the way to stack the odds in your favor.
Analyst note
Both brands ship an excellent app — 4.5/5, among the best in the category — so software isn't the deciding line. Support is: Anker's is US-based but slipping, BLUETTI's is inconsistent but improves markedly if you buy direct. At $330 to $399, neither support story should override what the specs say — but if talking to a human quickly matters to you, Anker still has the edge.
Growth path
SOLIX C300
FIXED CAPACITYFixed at 288Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 100W of solar. Limited to a single portable panel.
Adequate ports for most setups, but heavy users may want a power strip.
AC50B
FIXED CAPACITYFixed at 448Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 200W of solar. Limited to a single portable panel.
Limited ports. You'll likely need a power strip or splitter.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Neither expands, and that's no knock on either — each is a complete unit at a fixed size. Buy the capacity that covers your needs now (the AC50B gives you the larger ceiling); you can't add to either later.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
Anker SOLIX C300
The field record on the C300 is thin — it's a new, small unit, and what exists is first-look review coverage rather than long-term ownershipA0. Two things come up repeatedly in that coverage: the ≤10ms UPS switchover as genuinely unusual at this size and priceA3, and the pairing of dual 140W USB-C with a light, compact build aimed at hikers and campers keeping devices topped upA1A2. None of that is six-month durability data, so treat it as an informed first impression, not owner mileage.
“288Wh capacity with 300W output (600W with SurgePad) and dual 140W USB-C ports for fast device charging.”
Sources
ankersolix.com · trustedreviews.com · im.com.au · solarwaypoint.com · backuppowerhub.com · powerstationlab.com
BLUETTI AC50B
Same caveat on the AC50B — new enough that the record is reviews, not years of useB0. What's consistent there: a genuinely portable sub-15-lb LFP unit at 14.8 lbs, meaningfully lighter than the 21.4-lb AC70B2, with 700W output and 1,000W Power Lifting on tap for startup surgeB1, and fast refills — about 3 hours on standard AC, or 45 minutes to 80% with the optional Turbo chargerB3. One caution we'll raise ourselves: the 'B80 expansion' is BLUETTI's own framing, and it runs in power-bank mode — the B80 recharges the unit, it doesn't extend it as one systemB4.
“A 448Wh LiFePO4 battery with 700W output (1,000W Power Lifting), rated for 2,500+ cycles to 80% — years of reliable use.”
Sources
amazon.com · backuppowerhub.com · the-gadgeteer.com · t3.com · bluettipower.com
Sources & Research Notes
Every owner claim in this report is traceable to a published source. The bracketed references above resolve here.
Recurring owner themes
- Compact, light design; dual 140W USB-C fast charging; and a standout 10ms UPS rare at this size are the highlights. [SOLIX C300 · 3 entries]
- Affordable, genuinely portable LFP unit with 700W output, 2,500+ cycles, fast Turbo charging, and B80 expandability. [AC50B · 3 entries]
- A1
“288Wh capacity with 300W output (600W with SurgePad) and dual 140W USB-C ports for fast device charging.”
ankersolix.com / trustedreviews.com — SOLIX C300 review · 2026 · [positive]
- A2
“Anker claims the C300 is 30% smaller than competing power stations; reviewers call it impressively light and compact for the capacity, aimed at keeping phones and gadgets charged on hikes and camping trips.”
im.com.au / solarwaypoint.com — SOLIX C300 review · 2026 · [positive]
- A3
“Its 10ms UPS switchover is legitimately unique in this size and price class.”
backuppowerhub.com / powerstationlab.com — SOLIX C300 review · 2026 · [positive]
- B1
“A 448Wh LiFePO4 battery with 700W output (1,000W Power Lifting), rated for 2,500+ cycles to 80% — years of reliable use.”
amazon.com / backuppowerhub.com — AC50B review · 2026 · [positive]
- B2
“At 14.8 lbs it's meaningfully lighter than the AC70 (21.4 lbs) — a genuinely portable sub-15-lb unit with a long-cycle battery and 700W output at an easy-to-justify price.”
backuppowerhub.com / the-gadgeteer.com — AC50B review · 2026 · [positive]
- B3
“Standard AC charging is about 3 hours, dropping to 1.25 hours with the optional 480W Turbo charger; 0-80% in 45 minutes.”
amazon.com / t3.com — AC50B review · 2026 · [positive]
- B4
“The B80 can add 806Wh, but BLUETTI scopes this to "capacity expansion with B80 battery in Power Bank Mode" over an Aviation-to-XT60 cable — the pack recharges the unit rather than extending it as one system, so this is not expandability in the sense this site uses. At $279 it is BLUETTI's most affordable LiFePO4 station.”
bluettipower.com AC50B FAQ (primary) · 2026 · [positive]
Research compiled August 30, 2026.
Who Should Buy Which
Buy the SOLIX C300 if you…
- →The device charger. If your load is phones, tablets, a camera rig, and one or two laptops over USB-C, the C300's dual 140W portsA1 charge them faster than the AC50B can and weigh 5.7 lbs less in the bag.
- →The ultralight camper. At 9.1 lbs it's the one you actually carry up the trail, and its 100W solar tops it back up for a sunny afternoon off-grid — a job both cover, and the lighter, cheaper C300 is the better way to do it.
- →The desktop-PC minder on a budget. The ≤10ms UPS rating is the tighter of the two, and if a home-office PC riding through brief outages is the whole job, the cheaper box does it.
Buy the AC50B if you…
- →Anyone running an actual AC load. 700W continuous and a 1,000W surge start and hold things the C300's 300W won't — a 400W blender, a small fridge, power tools in short bursts.
- →The CPAP user with a humidifier. It's the only one of the two that covers a 320Wh night, finishing with 61Wh to spare, and at 14.8 lbs it still travels.
- →The value buyer doing the math. $0.89 a watt-hour and $0.30 per lifetime kWh make it the cheaper box to own despite the higher sticker — if you'll cycle it, the $69 premium pays for itself in capacity.
If neither fits
If your real need is a camping weekend (2,100Wh), an 8-hour blackout (1,645Wh), or van-life daily draw (4,685Wh), close this tab — both units come up thousands of watt-hours short. These jobs start at 1,645Wh and climb; shop that class, not a 288 or 448Wh box stretched past what it's built for.
The Bottom Line
Buy the AC50B unless you're shopping for a USB-C charging brick. It's the more capable unit — 448Wh, 700W, a 1,000W surge — and, the part that's easy to miss, the cheaper one per watt-hour: $0.89 against the C300's $1.04, $0.30 per lifetime kilowatt-hour against $0.35. The $69 you save on the C300 buys a smaller battery that costs more to feed.
The C300 is not a bad box; it's a different one. Nine pounds, dual 140W USB-C, a tighter UPS rating, and a quieter floor make it the right pick for the person charging devices out of a daypack. But if you're plugging into the AC outlets at all — a CPAP, a blender, a fridge — the bigger BLUETTI does more and costs less per watt-hour. Follow the division, not the sticker.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the BLUETTI AC50B worth $69 more than the Anker SOLIX C300?
For most buyers, yes. The AC50B holds 56% more capacity (448Wh vs 288Wh) and puts out more than twice the continuous power (700W vs 300W), and it actually costs less per watt-hour — $0.89 against $1.04. The C300 is only the cheaper unit at the register; per unit of energy stored, the AC50B is.
Can the Anker SOLIX C300 run a CPAP overnight?
Only a low-draw one. Against a 320Wh humidified-CPAP night, the C300's 245 usable watt-hours come up about 75Wh short — it runs most of the night, then quits. Drop the humidifier and a lower-draw CPAP can fit under that 245Wh, but for a guaranteed full night the AC50B covers 320Wh with 61Wh to spare.
Which is better for charging a laptop, the C300 or the AC50B?
The C300, decisively. It has two 140W USB-C ports that charge a 16-inch laptop at full speed, two at once, while the AC50B tops out at 65W USB-C, which throttles a modern laptop. If USB-C charging is your main use, the lighter, cheaper C300 is the better tool.
Which power station is quieter?
The C300 on paper, at a listed 25dB against the AC50B's 45dB — roughly the gap between near-silent and a running refrigerator. Both figures are best-case manufacturer floors that rise under load, so treat them as a class difference, not a measurement. It matters most for the person sleeping two feet from the unit; for daytime use, neither is loud enough to notice.
Do either of these expand if I need more capacity later?
No — buy the capacity you need up front. Neither the C300 nor the AC50B is expandable. BLUETTI markets a B80 add-on for the AC50B, but it runs in power-bank mode: it recharges the unit rather than extending it as one system, so it doesn't raise your usable ceiling the way a true expansion battery would. If you expect to grow, size up now — the AC50B is the larger of the two at 448Wh.
Where to buy
Anker SOLIX C300
$329.99
$329.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
BLUETTI AC50BPick
$399.00
$399.00 · direct from BLUETTI
Last checked 1 day ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.