Head-to-head test
Anker 535 PowerHouse vs Anker SOLIX C300
At an identical $300, the only question is whether the C300's lighter body, app, and ≤10ms UPS are worth trading away the 535's 512Wh for 288 of them, and for anyone buying watt-hours rather than ounces, they are not.
Full profiles: Anker 535 PowerHouse → · Anker SOLIX C300 →
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
$299.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
$329.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
Spec deltas
Two Anker units at the same $300, and the spec sheets nearly rhyme: the same 5-year warranty, the same 3,000-cycle LFP cells, both sealed boxes you cannot expand. Then capacity splits them down the middle. The 535 PowerHouse holds 512Wh; the SOLIX C300 holds 288. For the money, that gap is the whole argument, and it points at the 535.
The C300 is not trying to win on capacity. It is the lighter, newer idea of a small station: 9.1 lbs against the 535's 16.7, a phone app the 535 lacks, dual 140W USB-C ports that charge a big laptop at full speed where the 535's single 60W port throttles it, and a UPS mode rated ≤10ms that the 535 does not list at all. It trades battery to be the one you actually grab off the shelf.
So the real question is whether those conveniences are worth 224Wh of battery at the same price. For most people the answer is no. The 535 is nearly twice the unit for the same money and the only one of the two that runs a CPAP to morning. For the buyer who values the ounces and the ports over the watt-hours, the C300 is a genuine pick, and we will name exactly who that is.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
Because they cost the same and age at the same rate, the capacity gap compounds over life: 3,000 cycles at 512Wh is about 1,536 kWh delivered, against 864 for the C300, so a lifetime kilowatt-hour runs 20 cents on the 535 and 35 on the C300. Same durability, same price, and the 535 is both more energy and cheaper energy.
Both list at $299.99535 PowerHouse = 512Wh, SOLIX C300 = 288WhBoth use LFP rated 3,000 cycles with a 5-year warranty
Why it mattersAnyone choosing on watt-hours per dollar buys the 535 and never revisits the decision.
A CPAP overnight is a capacity problem before it is a noise problem: the quiet spec and the UPS are irrelevant if the battery quits about three-quarters of the way to your alarm. The 535 is the one that actually runs the night, with the fair caveat that Anker lists no dB figure for it, so a light sleeper should check hands-on fan reports first.
SOLIX C300 publishes 25dB and a ≤10ms UPS mode; the 535 publishes neitherCPAP overnight needs about 320WhC300 = 245Wh usable, 535 = 435Wh usable
Why it mattersThe CPAP buyer takes the 535 for the runtime and treats fan noise as the thing to verify, not the thing to decide on.
weight
For a laptop-and-phone user who wants the lightest possible unit and a desk that rides through grid blips, the 288Wh the C300 gives up is energy that buyer never uses, so the smaller battery costs them nothing and the ounces and ports are pure gain.
SOLIX C300 = 9.1 lbs vs 535's 16.7 lbsC300 = dual 140W USB-C vs 535's single 60W USB-COnly the C300 lists a ≤10ms UPS mode
Why it mattersThe ultralight, laptop-first buyer is the one who should take the C300 over the 535 at the same price.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: Selected because: at an identical $300, the 535 PowerHouse packs 512Wh to the SOLIX C300's 288, so what your money buys, energy and cost per lifetime kilowatt-hour, is the axis that settles this.
cost / lifetime kWh
Same $300, same 3,000 cycles, same 5-year warranty, so the only thing the money buys differently is capacity, and the 535 buys a lot more of it. Over the rated life that gap compounds: 3,000 cycles at 512Wh is about 1,536 kWh delivered, against 864 for the C300, which is why a lifetime kilowatt-hour costs 20 cents on the 535 and 35 on the C300. You are not paying more for the 535's energy. You are paying less, and getting more of it.
There is no asterisk hiding in the warranty or the cycle count to claw that back, because they are identical. The 535 is simply more battery for the same money, and since neither unit expands, that is permanent.
Portability & Form Factor
Selected because: Selected because: the C300's case is its 9.1-lb body against the 535's 16.7, a 7.6-lb gap that decides whether the extra battery is worth carrying.
weight
Here is the C300's real answer. At 9.1 lbs it is a one-hand, drop-it-in-the-daypack lift; the 535 at 16.7 lbs is a deliberate two-hand carry you set down with intent. That is 7.6 lbs between them, the difference between a unit you bring because it is no trouble and one you bring because you planned to. If the station spends more time being carried than being drained, those pounds outrank the watt-hours, and that is the whole reason the C300 exists.
What the Specs Don't Tell You
Selected because: Selected because: the app, the ≤10ms UPS, and dual 140W USB-C that the C300 has and the 535 lacks are the features that justify paying the same $300 for less battery.
The feature column is where the C300 collects its wins and the 535 shows its age: a phone app, a ≤10ms UPS mode, and dual 140W USB-C on the C300 against no app, no UPS, and a single 60W USB-C on the 535. For a desk full of modern gear that is a real gap in the C300's favor, since the app warns you before the battery dies, the USB-C charges a big laptop at full speed, and the UPS keeps a router alive through a grid blip.
The honest catches: the C300's UPS bridges a flicker, not a night, at 245Wh usable, and neither unit is solar-first. The 535's 120W ceiling wants the better part of a sunny afternoon to refill 512Wh, and the C300's 100W is only proportionally quicker. On noise, the C300 at least posts a number, a 25dB best-case floor, where the 535 posts none; that is no proof the 535 is louder, just nothing to hold it to. Plan to charge both from the wall.
Your Life, Your Pick
Selected because: Selected because: against real jobs only the CPAP overnight has a clear winner, the 535, and seeing where both fall short keeps the capacity gap in proportion.
Line these two up against real jobs and a pattern falls out: they are day-and-desk units, not house batteries. Only one scenario has a clean winner, the CPAP overnight, which the 535 finishes with 115Wh to spare while the C300 quits about three-quarters of the way through. The tiny stuff, an afternoon of phones and a light, both handle, and there the 9.1-lb C300 is the nicer grab.
Everything bigger is neither: a full camping weekend, an eight-hour blackout, a van-life day. A weekend's 2,100Wh is roughly five times the 535's usable 435Wh, and more still for the C300. The 535's edge in this section is not that it clears more scenarios; it is that when a job sits right at the edge, its 435Wh usable against the C300's 245 and its 500W continuous output are what tip it from almost-covered to done.
Strengths & trade-offs
Anker 535 PowerHouse
Strengths
- +Costs $30 less
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Lacks smartphone app control for remote monitoring.
Anker SOLIX C300
Strengths
- +Lighter by 7.6 lb
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 535 PowerHouse comes up 1,665Wh short (about 21% covered), the SOLIX C300 1,855Wh (12%). 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 535 PowerHouse comes up 1,210Wh short (about 26% covered), the SOLIX C300 1,400Wh (15%). 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
535 PowerHouse
This is the one real job on the list, and only the 535 finishes it. A CPAP pulls about 40 watts and needs roughly 320Wh to see morning; the 535 has 435Wh usable and ends with 115 to spare, while the C300's 245Wh runs out about three-quarters of the way through. The C300 owns the published-quiet spec and the UPS mode, but neither matters if the battery quits before your alarm. Buy the 535 here, and since Anker publishes no noise figure for it, check hands-on fan reports if you sleep light.
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 535 PowerHouse comes up 475Wh short (about 48% covered), the SOLIX C300 665Wh (27%). 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
Neither unit has the battery for a full tailgate. The 670Wh a party pulls sits against 435Wh usable in the 535 and 245 in the C300, so plan on a bigger station if this is a regular thing. The split worth knowing: a 400W load is inside the 535's 500W continuous, so it runs your gear until the battery is gone, while the C300 surges to 600W to kick a 400W load on, then falls back to 300W continuous and stalls. For a quick session the 535 is the less-wrong choice. For the whole afternoon, the answer is a larger unit.
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 535 PowerHouse comes up 4,250Wh short (about 9% covered), the SOLIX C300 4,440Wh (5%). 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 535 PowerHouse finishes at 23% used, the SOLIX C300 at 41%. At this size the decider is what rides in the bag — 9.1 lbs for the SOLIX C300 against 16.7 for the 535 PowerHouse — 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: 535 PowerHouse runs 2.1h vs 1.2h.
$299.99 list · direct from Anker
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 0–29hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–5.8hHigh-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 535 PowerHouse
At an identical $300, the 535 PowerHouse gives you 512Wh to the C300's 288, plus 500W of continuous output against 300W, on the same LFP cells, the same 3,000-cycle rating, and the same 5-year warranty. Nothing about durability or price separates them, so capacity decides, and the 535 has far more of it. It is also the only one of the two that finishes a CPAP night. The C300 earns its identical price for one specific buyer: someone who wants the lightest unit (9.1 lbs against 16.7), fast 140W USB-C for a laptop, and a ≤10ms UPS the 535 does not offer. If that is not you, buy the 535.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of August 30, 2026. The links below open Anker's current price.
$299.99 · direct from Anker
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): UPS, CPAP.
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, 535 PowerHouse rates 3.7/5 (21st percentile of 20 Compact-class units), and SOLIX C300 rates 4.2/5 (52nd 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.
Solar is a top-up on both, not a plan
At its 120W ceiling the 535 needs the better part of a sunny afternoon to refill 512Wh, and that is the optimistic figure, before clouds and panel angle take their cut. The C300's 100W refills its smaller 288Wh only proportionally faster. Charge either from the wall and treat panels as a bonus, not the primary source.
One reads the battery on your phone, one makes you walk over
The 535 reports its charge exactly one way: you go look at it. The C300 puts charge level, draw, and low-battery alerts on your phone. A shrug when the unit is on the same desk, genuinely useful when it is in a closet or a car and you would rather not get up to check.
UPS mode: the C300's clean win over the 535
Plug a router or a desktop into the C300's pass-through and a grid drop hands off to battery in ≤10ms, quick enough that most gear never reboots. The 535 lists no UPS mode at all, so the same outage drops whatever it is feeding. Keep it in scale, though: at 245Wh usable this protects a modem or a PC through a blink, it does not carry a CPAP through the night.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here.
535 PowerHouse: Noise Level Not Disclosed
The SOLIX C300 publishes its noise level (25dB); the 535 PowerHouse doesn't publish one. That isn't evidence the 535 PowerHouse is louder — it means there's no figure to hold it to, and no way to compare the two on this without hearing them. If you're buying for a bedroom, a CPAP, or an apartment, treat the SOLIX C300's 25dB as the only published number on the table — a spec-sheet figure, not a measurement — and look for hands-on reports of the 535 PowerHouse before deciding.
Full record above — the Test Desk pick is the 535 PowerHouse.
Check 535 PowerHouse 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 535 PowerHouse wins on both sticker price and long-term value. At $0.2/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner. 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.
Delivers each lifetime kWh for $0.18 less — check the 535 PowerHouse price →
Growth path
535 PowerHouse
FIXED CAPACITYFixed at 512Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 120W of solar. Limited to a single portable panel.
Adequate ports for most setups, but heavy users may want a power strip.
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.
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 535 PowerHouse 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 535 PowerHouse
Field data on the 535 is thin but consistent, and it is an older unit, so most of what exists is review-bench work rather than long-term ownersA0. Reviewers measured 89% round-trip efficiency and found it stayed cool and steady while delivering its full 500WA3, and clocked AC charging to 80% in about 2.5 hoursA4. The recurring knock is solar: the 120W ceiling realistically lands nearer 60 to 75W in real sun, so panel-only charging is slowA4. The through-line is a durable, efficient weekend unit whose age shows mainly in charging speed and featuresA1A0.
“512Wh capacity with 500W output on LiFePO4 cells rated for 3,000+ cycles and a 10-year lifespan, backed by a 5-year warranty.”
Sources
ankersolix.com · trustedreviews.com · macrumors.com · batteryessence.com
Anker SOLIX C300
Coverage on the C300 is reviewer-driven rather than long-term owner data, because it is a newer unit, so read the following as bench impressions, not a year of useB0. Reviewers consistently call it impressively light and compact for 288Wh, pitched at keeping phones and gadgets topped up on hikes and camping tripsB2. Two things get singled out: the dual 140W USB-C ports for fast device chargingB1, and a ≤10ms UPS switchover reviewers describe as genuinely unique at this size and priceB3.
“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
Sources & Research Notes
Every owner claim in this report is traceable to a published source. The bracketed references above resolve here.
Recurring owner themes
- Durable LFP (3,000+ cycles, 5-yr warranty), efficient, and compact for weekend camping; slow solar input is the caveat. [535 PowerHouse · 2 entries]
- 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]
- A1
“512Wh capacity with 500W output on LiFePO4 cells rated for 3,000+ cycles and a 10-year lifespan, backed by a 5-year warranty.”
ankersolix.com / trustedreviews.com — 535 PowerHouse review · 2026 · [positive]
- A3
“Demonstrated 89% round-trip efficiency and stayed stable and cool while delivering its full 500W AC output.”
batteryessence.com — 535 PowerHouse review · 2026 · [positive]
- A4
“AC charging to 80% takes about 2.5 hours; solar input caps at 120W (realistically 60-75W), so panel charging is slow.”
batteryessence.com — 535 PowerHouse review · 2026 · [mixed]
- B1
“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]
- B2
“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]
- B3
“Its 10ms UPS switchover is legitimately unique in this size and price class.”
backuppowerhub.com / powerstationlab.com — SOLIX C300 review · 2026 · [positive]
Research compiled August 30, 2026.
Who Should Buy Which
Buy the 535 PowerHouse if you…
- →You are buying watt-hours per dollar: you want the most battery $300 can get, and you will recharge from the wall. The 535's 512Wh is the answer.
- →You run a CPAP overnight and need it running at your alarm. The 535 finishes the night with 115Wh to spare; the C300 quits short of morning.
- →You occasionally push a 300 to 500W load, like a small fridge, a blender, or light tools, where the C300's 300W continuous rating would stall out.
Buy the SOLIX C300 if you…
- →You carry it more than you drain it. The 9.1-lb C300 slips into a daypack and disappears; the 16.7-lb 535 you feel on your shoulder.
- →Your loads are a laptop and a phone. The dual 140W USB-C tops a big laptop at full speed, and you will never reach the bottom of even 245Wh usable in a day.
- →You want a desk that rides through outages. The ≤10ms UPS keeps a router or a desktop alive through a grid blip; the 535 has no UPS to offer.
If neither fits
If your list runs to a full camping weekend, an eight-hour blackout, or a van-life day, neither of these covers it, and choosing between them will not change that. A weekend's 2,100Wh is roughly five times the 535's usable 435Wh, and more still for the C300. Both are day-trip and desk-side units; ask either to be a house battery and they disappoint you equally. Shop a much larger station instead.
The Bottom Line
Same brand, same $300, same warranty, same cells, and the 535 PowerHouse holds 512Wh where the C300 holds 288. That is the page. Nothing about how long these last or what they cost sets them apart, so the extra battery decides it, and the 535 has nearly twice as much. It is also the only one of the two that runs a CPAP to morning.
The C300 is a genuinely good small unit. If you want the lightest thing that charges a laptop over 140W USB-C and keeps a router alive through an outage, buy it and do not look back. But if you are weighing watt-hours against a nine-pound body and a phone app, at this price the watt-hours win. Get the 535, plug it into the wall, and enjoy twice the reserve for the same money.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Why does the 535 PowerHouse cost the same as the smaller SOLIX C300?
The C300 charges for its newer feature set, the dual 140W USB-C, the ≤10ms UPS mode, the app, and a body that is 7.6 lbs lighter (9.1 vs 16.7), not for battery. On raw energy the 535 is far cheaper: 512Wh against 288Wh for the same $300, which works out to 59 cents per watt-hour versus $1.04. If you are paying for watt-hours, the 535 is the deal; if you are paying for portability and ports, the C300's price makes sense.
Can the SOLIX C300 run a CPAP all night?
Not a full night. A CPAP needs roughly 320Wh to run about eight hours, and the C300 has only 245Wh usable, so it covers about three-quarters of the night and quits before morning. The 535 PowerHouse, with 435Wh usable, finishes with 115Wh to spare. For CPAP use, buy the 535, and since Anker does not publish a noise figure for it, check hands-on reports if you are a light sleeper.
Which is better for camping?
For a day trip topping up phones, a speaker, and a light, both do it easily and the C300's 9.1 lbs is the nicer carry. For a full weekend running a 12V fridge, neither has the battery: a weekend's 2,100Wh is about five times the 535's usable 435Wh, so you would want a much larger station. Between these two for light camping, take the lighter C300 unless you want the 535's bigger reserve for a second day.
Does either one work as a home-backup UPS?
Only the C300 has a UPS mode; it switches to battery in ≤10ms, fast enough that a router, modem, or desktop should not notice the grid dropping. The 535 lists no UPS at all. But keep the scale honest: the C300's 245Wh usable will carry small electronics through a blip or a short outage, not your whole house through the evening. For real backup you need a much bigger unit; for keeping the internet alive through a flicker, the C300 is the one.
Is the older 535 PowerHouse still worth buying in 2026?
Yes, if you want capacity for the price. It is an older design, but it uses the same LFP chemistry and 3,000-cycle rating as the C300, with a 5-year warranty and reviewer-measured 89% efficiency that ran cool at a full 500W load. What it lacks is the modern convenience layer: no app, no UPS, a single 60W USB-C, and slow 120W solar. If those do not matter to you, 512Wh at $300 is hard to beat.
Where to buy
Anker 535 PowerHousePick
$299.99
$299.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
Anker SOLIX C300
$329.99
$329.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.