Head-to-head test
Anker 535 PowerHouse vs Anker SOLIX C800 Plus
The $349 gap between these two buys a UPS, an app, and a published noise spec, not more usable power, since both run dry on every scenario here except an overnight CPAP.
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
Anker
535 PowerHouse
1,813Power Score · Device Hub
$299.99 list · direct from Anker
Anker
SOLIX C800 Plus
2,199Power Score · Appliance Class
$649.00 list · direct from Anker
Spec deltas
The Anker SOLIX C800 Plus costs $349 more than the Anker 535 PowerHouse, and on most of what these two get asked to do, that premium buys almost nothing: both run out of watt-hours on five of the six real-world loads tested here, from a weekend of camping to a full van-life day off-grid.
What the money does buy is generational, not incremental: a 20-millisecond UPS switchover the 535 never had, an Anker app for remote monitoring, a 300W solar input two and a half times the 535's 120W, and a published 45dB noise rating instead of no rating at all. It also buys real headroom for anything over 500W continuous, the 535's hard ceiling, since the C800 Plus runs up to 1200W with a 1600W surge on top.
Both are 5-year-warrantied Anker lithium-iron units built for weekends and single-appliance backup, not multi-day survival. If your gear stays under 500W and you don't need UPS or app control, the 535 is the better dollar-for-dollar buy at $0.20 per lifetime kWh against $0.28 for the C800 Plus, so buy up only if the newer unit solves a problem you actually have.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
One reviewer cut power to the C800 Plus mid-test specifically to check this, and reported the monitor didn't even flickerB4, a pass-through the 535 simply wasn't designed with.
535 PowerHouse has no listed UPS or switchover specSOLIX C800 Plus switches to battery power in 20 milliseconds
Why it mattersIf anything you'd plug in, a router, a monitor, a CPAP, can't tolerate even a blip, that UPS spec is worth more than the capacity difference between these two.
cost / lifetime kWh
That extra $0.08 per kWh is the price of the UPS, the app, the faster solar, and the disclosed noise spec, not a battery that ages any better or lasts any longer.
535 PowerHouse costs $300 for 512Wh, working out to $0.20 per lifetime kWh over 3,000 cyclesSOLIX C800 Plus costs $649 for 768Wh, working out to $0.28 per lifetime kWh over the same 3,000 cycles
Why it mattersIf none of those extras matter to you, the 535 is the more efficient dollar and the SOLIX name isn't worth the markup by itself.
solar input
Every one of the five "neither" scenarios on this page ends the same way, both units run out and need a recharge before the job's done, so the unit that refills faster effectively loses less time to the sun.
535 PowerHouse max solar input is 120W, a computed 6.1-hour recharge from emptySOLIX C800 Plus max solar input is 300W
Why it mattersFor multi-day or off-grid use where solar is the only recharge option, the C800 Plus's faster input is a real advantage even though neither unit covers the full load outright.
continuous output
Space heaters, full-size coffee makers, and hair dryers routinely draw more than 500W at startup, enough to trip the 535's ceiling outright, while the C800 Plus's 1200W rating, backed by a 1600W surge allowance, absorbs the same load without issue.
535 PowerHouse output is rated at 500W with 0W of listed surge headroomSOLIX C800 Plus is rated at 1200W continuous with a 1600W surge rating
Why it mattersIf your emergency-power list includes anything with a heating element or a startup motor over 500W, the 535 is disqualified before its smaller capacity even becomes the issue.
The specific dimensions that decide these two units — everything else is a tie.
What the Specs Don't Tell You
Selected because: Six Test Notes fire for this pair and carry the real story, app control, UPS, solar speed, noise disclosure, not the 256Wh capacity difference.
Every Test Note here is a feature the 535 shipped without and the C800 Plus shipped with: a UPS switchover, an app, a faster solar input, a published noise rating. None of them touch capacity, they're about what happens when the power's already out or you're not standing next to the unit.
The one card that cuts the other way is warranty value. Both units carry the same five years of coverage, so the C800 Plus's higher price stretches that coverage over a bigger battery, not a longer one, priced per warranty year, the 535 runs $60 against the C800 Plus's $130 for identical protection.
Your Life, Your Pick
Selected because: Five of six computed loads return neither, which needs explaining rather than reading as the page having nothing to say; the sixth, CPAP, is the one clean split.
Line up all six loads and the two units post nearly the same verdict five times over: neither covers a weekend of camping, an eight-hour blackout, a remote workday, a tailgate, or a full van-life day. Weekend Camping alone needs 2,100Wh, the 535 runs out at 483% of capacity used, the C800 Plus at 322%, and that same pattern, both short, one shorter, repeats across every multi-appliance load here.
CPAP Overnight is the exception, because it's light enough that capacity stops being the constraint. The 535 spends about three-quarters of its charge on it; the C800 Plus spends under half, which is why the C800 Plus takes this one despite both units technically handling it. Extra headroom on an already-survivable load is exactly the edge that matters at 3 a.m.
Lifetime Value
Selected because: The 535 is cheaper per lifetime kWh despite the C800 Plus's higher PowerScore; that tension is the honest counterweight to the capability case.
cost / lifetime kWh
Run the numbers over each unit's full cycle life and the 535 comes out ahead: $0.20 per lifetime kWh against $0.28 for the C800 Plus, even though the C800 Plus costs more upfront. Same 3,000-cycle rating, same 5-year warranty, the newer unit simply costs more for every watt-hour it'll ever deliver.
That's the honest counterpoint to buying on the feature list: the UPS, the app, and the faster solar don't change what you pay per watt-hour over the unit's life. The C800 Plus earns its premium on capability, not on cost efficiency, and buyers who only need stored power should weigh that before paying up.
Growth Path
Selected because: Neither unit expands, so the closing advice is simple: buy the ceiling you need now, since there's no add-on path for either.
solar input
Neither unit expands. What you buy on day one is what you own for the next 3,000 cycles, and the only flexibility this pair offers is the 256Wh gap between the 535's 512Wh and the C800 Plus's 768Wh.
Size the purchase for the biggest single load you'll actually run, not for room to grow later, because that room doesn't exist for either one. Buyers who might need more than 768Wh down the line should look outside this pair; there's no add-on tank or satellite battery waiting for either Anker unit.
Strengths & trade-offs
Anker 535 PowerHouse
Strengths
- +Costs $349 less
- +Lighter by 7.3 lb
Trade-offs
- –Weaker inverter (-700W) limits appliance compatibility.
- –Lacks smartphone app control for remote monitoring.
Anker SOLIX C800 Plus
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$349) than the 535 PowerHouse.
Will It Power Your Gear?
Scenario math and per-appliance runtimes, modeled from the spec record.
Scenario verdicts
We ran the math on six 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
A full weekend of camping loads, fridge, lights, device charging, adds up to roughly 2,100Wh, more than four times what the 535 carries and over three times the C800 Plus's 768Wh. Both run dry well before the weekend's over; this load calls for a bigger station or a solar top-up plan, not either of 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
1,645Wh over eight hours is a real outage load, a cycling fridge, some lighting, maybe a router, and it outstrips the 535 by more than three and a half times and the C800 Plus by more than two and a half times. Either unit buys real hours; neither buys the whole outage.
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
SOLIX C800 Plus
This is the one load light enough for capacity to stop mattering: the 535 uses about three-quarters of its charge, the C800 Plus under half. That spare headroom is why the C800 Plus takes this scenario even though both units handle it without issue.
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
A laptop-monitor-phone workday runs around 910Wh, already more than double the 535's capacity and close to one and a half times the C800 Plus's. Both need a midday top-up to make it through a full workday on battery alone.
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
670Wh of speaker, lights, and a small grill accessory pushes the 535 well past its capacity and leaves the C800 Plus just short too, at 103% of what it holds. Close doesn't count, both run out before the tailgate does.
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
4,685Wh a day is a full house of appliances running off-grid, and it isn't close for either unit, the 535 would need to fully recharge nearly eleven times over, the C800 Plus more than seven. Daily loads at this scale call for a fixed solar-plus-battery system, not a portable station.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
The Load Test
RUNTIME = (Wh × 0.85) ÷ LOAD
None of the six 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: SOLIX C800 Plus runs 3.2h vs 2.1h.
$649 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 0–43.5hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–8.7hHigh-Draw Appliances
These reveal the real limitsscale 0–0.7h¹ 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
July 28, 2026
Verdict: the SOLIX C800 Plus, on Power Score margin
Take the SOLIX C800 Plus if anything you own draws more than 500W continuous, a real space heater, a full-size coffee maker, a hair dryer, because the 535's inverter simply won't start it, while the C800 Plus runs up to 1200W (1600W on a surge). You're also getting a 20-millisecond UPS switchover, an app, and a published 45dB noise figure the 535 never had, for $349 more. But the 535 PowerHouse is the better dollar-for-dollar buy if none of that applies: it's cheaper to own per watt-hour ($0.20 against $0.28) and covers the one load both units share here, an overnight CPAP, using less of its budget than most nights will ever demand. Buy based on your actual loads, not the bigger number on the box.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 28, 2026. The links below open Anker's current price.
$649.00 list · direct from Anker
or check the 535 PowerHouse price$299.99 list
Written by Wenny Zheng, Portable Power Tester · Station Arena Test Desk · Updated July 28, 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, Solar Generator.
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 3.5/5 (11th percentile of 19 Compact-class units), and SOLIX C800 Plus rates 4.0/5 (39th percentile of 19 Compact-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.
45dB Is the Rated Figure, Not the Load Figure
Anker's spec sheet puts the C800 Plus at 45dB. Treat that as a baseline lab reading for comparing against other units' spec sheets, not a promise of what fast-charging or a hot afternoon sounds like in the room it's sitting in.
535 PowerHouse: Solar Recharge Takes 6.1h
120W is the 535's solar ceiling, which works out to roughly 6.1 hours of strong sun for a full recharge from empty. The C800 Plus accepts up to 300W, two and a half times the input, so the same size battery refills in a shorter window when the grid's down and the sun is the only source.
535 PowerHouse: No App Control
The 535 PowerHouse has no companion app; everything is read off the unit itself. The C800 Plus pairs with Anker's app for remote monitoring, charge limits, and firmware updates, the kind of feature that simply didn't exist on power stations this size when the 535 was designed.
Only the SOLIX C800 Plus Has UPS Protection
The C800 Plus switches to battery in 20 milliseconds if wall power drops, so anything plugged into it keeps running through the gap. The 535 PowerHouse has no listed switchover spec, it's a battery you carry to your gear, not one your gear rides through an outage on.
Warranty Value Comparison
Both units carry a 5-year warranty, so the coverage length is identical. Priced per year of that coverage, the 535 works out to $60 a year against $130 a year for the C800 Plus, the newer unit's premium buys a bigger battery behind the warranty, not more years of it.
535 PowerHouse: Noise Level Not Disclosed
Anker has never published a dB rating for the 535 PowerHouse, so there's nothing here to set against the C800 Plus's 45dB figure. An absent number isn't evidence the fan is quiet or loud, it's just a gap the spec sheet doesn't fill.
Full record above — the Test Desk pick is the SOLIX C800 Plus.
Check SOLIX C800 Plus price →or check the 535 PowerHouse 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.
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 C800 Plus
FIXED CAPACITYFixed at 768Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 300W 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 SOLIX C800 Plus 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
Independent bench testers found the 535 PowerHouse ran stable and cool at its full rated output, with strong round-trip efficiency holding up under real loadA3, and called it compact and well-equipped for a 512Wh unitA2. The one consistent knock, even from reviewers who liked it, is solar: panel charging runs well under its rated ceiling in practiceA4.
Coverage here leans toward professional test-bench reviews rather than long-term owner forumsA1A2, solid first-impression testing, but not the months-later reliability reporting the C800 Plus has accumulated.
“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 C800 Plus
Reviewers who pushed the C800 Plus with sustained loads report the fan becomes clearly audible in a quiet room once temperatures climb or during fast chargingB1B11, real behavior worth knowing before you park it next to where you sleep. The companion app draws consistent praise for remote monitoring and firmware delivery, with reviewers who'd never had an app-connected power station before saying it proved genuinely useful after the first tripB7B8B15.
On capacity, the picture is mixed: reviewers running light loads like a fridge or gadget charging came away satisfiedB6, while several others flagged the 768Wh capacity as tight against heavier appliances and against same-price competitors with more storageB5B10B12. The signature light-pole accessory is polarizing too, some reviewers call it a genuine lantern replacement worth keepingB14, others call it unnecessary and note it leaves nowhere to stash cablesB2B3.
“The pole light felt is a little over the top and unnecessary.”
Sources
dustinabbott.net
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]
- Fan noise is consistently reported as noticeable during fast AC charging or high sustained wattage, though most reviewers call it 'manageable' rather than a dealbreaker. [SOLIX C800 Plus · 2 entries]
- The companion app is repeatedly praised for remote monitoring/control and firmware delivery, with no reviewers reporting connectivity or crash complaints. [SOLIX C800 Plus · 3 entries]
- 768Wh capacity is flagged by multiple reviewers as the unit's main limitation for heavy appliances and against same-price competitors, even though real-world light loads (fridge, gadgets) performed well. [SOLIX C800 Plus · 4 entries]
- The signature 'Plus' camping-light pole/torches are polarizing: some reviewers call the feature genuinely useful and a lantern-replacement, others call it an unnecessary gimmick that sacrifices the C800's cable-storage cubby. [SOLIX C800 Plus · 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]
- A2
“Weighs 16.5 lbs and is compact for a 512Wh unit, with 4 AC ports, 3 USB-A, a USB-C, and a car outlet.”
macrumors.com / batteryessence.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
“Once the temperature rose above 80F with a 1,030 average wattage, the fan noise was unavoidable and quite present in a quiet house.”
How-To Geek — 'Anker Solix C800 Plus Review: A Power Station Prepared to Illuminate Nighttime' · 2024-03 · [negative]
- B2
“The pole light felt is a little over the top and unnecessary.”
How-To Geek — 'Anker Solix C800 Plus Review: A Power Station Prepared to Illuminate Nighttime' · 2024-03 · [mixed]
- B3
“As it is, there's nowhere to keep the cords when not using them.”
How-To Geek — 'Anker Solix C800 Plus Review: A Power Station Prepared to Illuminate Nighttime' · 2024-03 · [negative]
- B4
“Unplugged the power supply to the C800 Plus to simulate a power outage. No reaction on the monitor, no flicker, just continued operating.”
DustinAbbott.net — 'Anker Solix C800 Plus Power Station Review' · 2024-03 · [positive]
- B5
“My lone concern on this front is whether or not the battery capacity is sufficient.”
DustinAbbott.net — 'Anker Solix C800 Plus Power Station Review' · 2024-03 · [mixed]
- B6
“I connected the Anker and in 8 hours, my frig/freezer used 10% of the power.”
The Gadgeteer — 'Anker SOLIX C800 Plus power station review' · 2024-04 · [positive]
- B7
“My other power stations do not have a companion phone app. But after the first trip, I saw how this feature would come in handy.”
The Gadgeteer — 'Anker SOLIX C800 Plus power station review' · 2024-04 · [positive]
- B8
“You should always charge at a slower rate if possible though, as it helps to preserve the battery life.”
MakeUseOf — 'Anker Solix C800 Plus Review: The Ultimate Emergency and Camping Companion' · 2024-05 · [mixed]
- B10
“it doesn't have the outright storage or power to tackle more heavy duty appliances like kettles or some coffee machines.”
Trusted Reviews — 'Anker SOLIX C800 Plus Review: A great camping companion' · 2024-04 · [negative]
- B11
“The fan does ramp up during fast charging, but the noise is manageable at roughly arm's length.”
The Power Pick — 'Anker SOLIX C800 Plus Review: Camping Lights Meet Serious Power' · 2026-02 · [mixed]
- B12
“The 768Wh capacity sits in an awkward middle ground. It is significantly less than the 1,024Wh offered by the EcoFlow DELTA 3 Plus at the same $649 price.”
The Power Pick — 'Anker SOLIX C800 Plus Review: Camping Lights Meet Serious Power' · 2026-02 · [negative]
- B14
“We stopped packing separate lanterns after the first week, streamlining our camping setup noticeably.”
BackupPowerHub — 'Anker SOLIX C800 Plus Review: Best Mid-Range with Camping Lights' (45-day, 8-trip field test) · 2026 (article ~1 week old at time of research) · [positive]
- B15
“Through the app, you can easily install firmware updates that may include performance enhancements, bug fixes, or new functionalities.”
Greener Ideal — 'Anker SOLIX C800 Plus Portable Power Station Review' · 2024-08 · [positive]
Research compiled July 28, 2026.
Who Should Buy Which
Buy the 535 PowerHouse if you…
- →You're charging phones, running a CPAP, or keeping a few lights on for a weekend, and you don't want to pay for a UPS or an app you'll rarely open. The 535 covers that ground at $300 and remains the cheaper unit to own over its full cycle life.
- →You're usually near a wall outlet and only need battery backup for the gap in between, not silent overnight monitoring, so the missing UPS and app matter less when you're standing right next to the unit anyway.
Buy the SOLIX C800 Plus if you…
- →Anything in your kit draws more than 500W continuous, a real space heater, a full-size coffee maker, and the 535 is disqualified before price even enters the conversation, since its inverter caps out there and the C800 Plus's 1200W (1600W surge) doesn't.
- →You want the UPS pass-through for a router, a monitor, or a CPAP that can't tolerate a blip, plus app-based monitoring from another room, the kind of feature reviewers who'd never had it before said they'd genuinely use after the first tripB7.
If neither fits
If you're planning for a multi-day blackout, a full van-life setup, or anything pulling close to a kilowatt for hours at a stretch, both of these run out, Weekend Camping alone needs 2,100Wh and neither holds half that. Look at a larger fixed-capacity or expandable station instead; this pair is sized for weekends and single-appliance backup, not for living off one battery.
The Bottom Line
The C800 Plus isn't a bigger 535 PowerHouse, it's a newer one: a UPS switchover, an app, faster solar, and more than double the continuous output, all for a real premium and a small hit to cost-per-watt-hour.
Buy the C800 Plus if anything you own draws more than 500W or can't tolerate a power blip. Buy the 535 and bank the difference if it can't, the older unit still handles the one load these two share, an overnight CPAP, without drama.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the Anker SOLIX C800 Plus just a bigger 535 PowerHouse?
Not really. It has 256Wh more capacity, but the bigger differences are a UPS switchover, an Anker app, faster solar input, and more than double the continuous output (1200W against 500W), capabilities the 535 was never built with, not just a larger battery.
Which one is cheaper to own long-term?
The 535 PowerHouse, even though it costs less upfront too. Over each unit's full 3,000-cycle life it works out to $0.20 per lifetime kWh against $0.28 for the C800 Plus, so the price gap doesn't close with use, it's baked in from day one.
Can either of these run a CPAP all night?
Yes, both handle a typical CPAP overnight load without issue. The 535 uses about three-quarters of its charge doing it, the C800 Plus under half, so the C800 Plus leaves more buffer for a second night or a machine that runs warm.
Does the 535 PowerHouse have UPS protection or app control?
No, both are C800 Plus features. It switches to battery in 20 milliseconds if the wall power drops and pairs with Anker's app for remote monitoring, functionality the 535 shipped without. If either matters to you, the C800 Plus's higher price is buying real capability, not just a bigger battery.
Is the SOLIX C800 Plus's 45dB noise rating trustworthy?
It's Anker's own published spec, so it's a real number, but reviewers running the unit under sustained load or fast charging describe the fan as clearly audible in a quiet room, treat 45dB as a lab measurement, not a guarantee of how it sounds mid-charge. The 535, for comparison, has no published dB figure at all.
Where to buy
Anker 535 PowerHouse
$299.99
$299.99 list · direct from Anker
Anker SOLIX C800 PlusPick
$649.00
$649.00 list · direct from Anker
Prices may vary by retailer and are subject to change.