Head-to-head test
BLUETTI Apex 300 + 2×B300K vs BLUETTI EP900 + 2×B500
The EP900 costs $7,199 more than the Apex 300 for just 1,626Wh more battery. That premium isn't buying capacity, it's buying a hardwired whole-home solar platform, 9,000W of input and a 10-year warranty. If you're not doing that install, the Apex is nearly the same energy for under a third of the price.
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
BLUETTI
Apex 300 + 2×B300K
7,856Power Score · The AC & Fridge Zone
$3,699.00 list · direct from BLUETTI
BLUETTI
EP900 + 2×B500
10,574Power Score · Whole-Home Capable
$10,298.00 list · direct from BLUETTI
Spec deltas
The Apex 300 holds 8,294Wh for $3,099. The EP900 + 2×B500 holds 9,920Wh for $10,298. That's $7,199 more, more than triple the price, for 1,626Wh more battery.
Put that gap in one line and the upgrade looks absurd: the added capacity is almost the cheapest thing in it. What the $7,199 actually buys is a different machine, a hardwired whole-home inverter with 9,000W of solar input against the Apex's 2,400W, 7,600W of output against 3,840W, a 10-year warranty against 5, and 6,000 cycles against 3,500.
So the decision isn't base-versus-bigger, it's power station versus installed home system. The Apex is a box you plug into and can move. The EP900 is 343 lbs of equipment wired into your house, with no USB ports because you don't plug a phone into your electrical panel. Pick the one that matches the project, not the bigger number.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
The money goes to the platform instead: 9,000W of solar input against 2,400W, 7,600W output against 3,840W, and a 10-year warranty against 5. That's a whole-home solar system's spec sheet, not a bigger power station's.
EP900 + 2×B500 holds 9,920Wh and costs $10,298Apex 300 holds 8,294Wh and costs $3,099
Why it mattersIf you're not building a rooftop-array home install, you're paying $7,199 for capabilities you won't wire up, and the Apex is the honest buy.
weight
That's the tell that these are different categories. The EP900 is meant to be hardwired to a subpanel and left alone, which is why it drops the conveniences of a portable unit entirely.
Apex 300 has 100W USB-C output and weighs 213.9 lbsEP900 + 2×B500 has no onboard USB and weighs 343 lbs
Why it mattersIf you want to actually plug devices into the unit or ever reposition it, the Apex is the only one of the two that fits the description.
The EP900's longer cycle life and 10-year warranty are real and suited to a permanent install, but they don't rescue the per-kWh math against a unit that costs under a third as much upfront.
Apex 300 delivers $0.11 per lifetime kWh at $3,099EP900 + 2×B500 delivers $0.17 per lifetime kWh at $10,298
Why it mattersOn pure value the Apex wins; the EP900 justifies its price on installed-system capability, not on cost of energy.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: The Apex is far cheaper to buy and to own; the core of the verdict.
cost / lifetime kWh
The Apex is the value winner and it isn't close: $3,099 against $10,298, and $0.11 per lifetime kWh against $0.17. The EP900 costs more than triple for a battery only 1,626Wh larger, so the price-per-kWh gap is baked in from the start.
The EP900 does have the longer runway, 6,000 cycles and a 10-year warranty against 3,500 cycles and 5 years, which is exactly what a permanent install should have. But cost per warranty year still runs $1,030 against the Apex's $620. Longevity that fits the install horizon doesn't make it the cheaper energy.
PowerScore Breakdown
Selected because: The EP900's output and inverter class is the real thing the premium buys.
overall power score
Output is where the EP900 acts its price. It puts out 7,600W against the Apex's 3,840W, roughly double, enough to run a washer, dryer, heater, and refrigerator together as a whole-home inverter rather than a backup box.
That capability is genuine and it's the point of the platform. But it only matters if you're wiring it to run the house. For plug-in loads, the Apex's 3,840W already covers a normal backup list, and the EP900's extra output sits unused unless it's hardwired into your panel.
Growth Path
Selected because: 9,000W solar against 2,400W is the EP900's genuine whole-home advantage.
solar input
This is the EP900's strongest honest argument. It accepts 9,000W of solar against the Apex's 2,400W, and it expands into a large multi-day battery bank, so for a serious off-grid or whole-home solar build it's the platform that keeps up as the array grows.
The Apex expands too, but its lower solar ceiling, and the charge-rate limits its owners reportA2A8, cap how off-grid it can realistically go. If the plan is a big rooftop array and near-independence from the grid, the EP900's input is the difference-maker. If it's backup with occasional solar, the Apex is enough.
Portability & Form Factor
Selected because: 343 lbs hardwired versus 213.9 lbs semi-portable defines the class split.
weight
Neither of these is portable in any real sense, but they're immovable in different ways. The Apex is 213.9 lbs, a two-person lift you can at least relocate with effort and plug in anywhere. The EP900 is 343 lbs and designed to be wired in and left, 129 lbs more and no plug-and-go pretense.
That's the cleanest way to tell them apart. One is a very heavy appliance you own; the other is infrastructure you install. Which is right depends entirely on whether you want equipment or a fixture.
Your Life, Your Pick
Selected because: Both cover every realistic scenario; only van life nominally separates them.
On the standard scenarios there's almost nothing between them: both clear camping, blackouts, CPAP, a workday, and a tailgate comfortably, each using a small slice of its bank. The only nominal separation is Van Life Daily, which the EP900 wins on paper at 56% of capacity against the Apex's 66%.
Treat that win as an artifact of the math, not advice. A 343-lb hardwired home system does not go in a van; the Apex is the only one of the two you could even attempt to, and that's already a stretch at 213.9 lbs. For every scenario a buyer would realistically ask either unit to do, they're even.
Strengths & trade-offs
BLUETTI Apex 300 + 2×B300K
Strengths
- +Costs $6,599 less
- +Lighter by 129.1 lb
Trade-offs
- –Weaker inverter (-3,760W) limits appliance compatibility.
- –Very heavy unit that may be difficult for one person to lift.
- –Shorter-lived battery — rated for 3,500 charge cycles vs the EP900 + 2×B500's 6,000, so it wears out sooner.
BLUETTI EP900 + 2×B500
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$6,599) than the Apex 300 + 2×B300K.
- –Significantly heavier (+129.1 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
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
Either unit
Two nights out needs about 2,100Wh, trivial for both. But neither is a camping unit in any practical sense at 214 to 343 lbs; if a campsite is the real use case, both are the wrong tool and a lighter station is the answer.
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
Either unit
Both walk through a standard outage using a small fraction of capacity, the Apex at 23% and the EP900 at 20%. With this much reserve either way, the decision belongs to install type and price, not this scenario, and there the Apex is thousands cheaper.
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
Either unit
Both are wildly overqualified for CPAP. You're using 5% or less. Save your money and buy whichever is cheaper; the extra capacity is completely wasted on a 40W overnight load. Put the savings toward a second battery for multi-night trips.
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
Either unit
Both power your workstation all day without breaking a sweat. At these utilization levels, prioritize the unit with better USB-C output for direct laptop charging. It's more convenient than using the AC inverter and wastes less energy.
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
Either unit
Both handle game day easily. Since capacity isn't the deciding factor, consider weight: the lighter unit is easier to load into a truck bed. Also check if either has Bluetooth speaker-level noise. Fan sound matters in social settings.
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
EP900 + 2×B500
On paper the EP900 edges this at 56% of its bank against the Apex's 66%, but ignore the number: a 343-lb hardwired home system doesn't go in a van. The Apex is the only one you could even attempt to install in one, and at 213.9 lbs that's already ambitious. For van use, this comparison is really Apex-or-nothing.
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: EP900 + 2×B500 runs 41.1h vs 34.4h.
$10,298 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 0–562.1hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–112.4hHigh-Draw Appliances
These reveal the real limitsscale 0–8.4h¹ 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 16, 2026
Verdict: the BLUETTI Apex 300 + 2×B300K
These aren't two versions of the same thing; they're two different projects. The Apex 300 is a self-contained power station: 8,294Wh, plugs and USB ports, semi-portable, $3,099, and $0.11 per lifetime kWh. The EP900 + 2×B500 is a hardwired whole-home energy system: 9,920Wh, 7,600W output, 9,000W of solar input, a 10-year warranty, 343 lbs, no onboard USB, and $10,298 at $0.17 per lifetime kWh. The EP900 holds only 1,626Wh more, so the extra $7,199 buys the inverter-and-solar platform and the install horizon, not the battery. For anyone who wants stored energy in a usable box, the Apex delivers almost the same capacity for under a third of the cost and wins on value outright. The EP900 earns its price only as a permanent whole-home solar-and-backup install with a large rooftop array.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 16, 2026. The links below open BLUETTI's current price.
$3,699.00 list · direct from BLUETTI
or check the EP900 + 2×B500 price$10,298.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated July 16, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
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, Apex 300 + 2×B300K rates 3.5/5 (13th percentile of 17 Whole-Home / Off-Grid-class units), and EP900 + 2×B500 rates 3.9/5 (38th percentile of 17 Whole-Home / Off-Grid-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.
One is very heavy, the other is installed
The Apex 300 is 213.9 lbs, a two-person lift you can at least relocate and plug in. The EP900 + 2×B500 is 343 lbs, 129 lbs more, and built to be wired to a panel and never moved. Neither is portable; only one pretends to be equipment rather than infrastructure.
50dB against 45dB under load
The EP900 runs at 50dB working hard, the Apex at 45dB, a modest 5-decibel gap. Both are loud enough to notice in a living space, but each typically lives in a garage or utility area where it doesn't matter much.
The EP900 lasts longer, as an install should
The EP900 is rated for 6,000 cycles against the Apex's 3,500, matching its 10-year warranty and permanent-install intent. The Apex's 3,500 is still over a decade of weekly use, so this favors the EP900 without making the Apex short-lived.
Full record above — the Test Desk pick is the Apex 300 + 2×B300K.
Check Apex 300 + 2×B300K price →or check the EP900 + 2×B500 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 Apex 300 + 2×B300K wins on both sticker price and long-term value. At $0.13/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner.
Growth path
Apex 300 + 2×B300K
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 8,294Wh.
Accepts up to 2,400W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
Expansion batteries are BLUETTI-specific. You're investing in the BLUETTI ecosystem.
EP900 + 2×B500
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 9,920Wh.
Accepts up to 9,000W of solar. Enough for a serious multi-panel array.
Limited ports. You'll likely need a power strip or splitter.
Expansion batteries are BLUETTI-specific. You're investing in the BLUETTI ecosystem.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Both expand, but the EP900 + 2×B500's higher solar ceiling (9,000W vs 2,400W) gives it the stronger off-grid growth path — more panels can feed a bigger bank as it grows.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
BLUETTI Apex 300 + 2×B300K
The Apex's owner story starts with its physical reality. Reviewers who handled it flag the weight first, about 38kg for the base alone and much more in this two-battery build, enough that they call it too big for most people to carry alone and effectively a stationary installA12A13. The other recurring gripe is unbundling: the unit ships with no DC or USB ports on the face, so owners have to add the roughly $300 Hub D1 accessory to get them backA10A17.
It's not without fans. One owner uses the 240V output to charge a plug-in hybrid at 3.3kW on the roadA5, and a reviewer ran household essentials for more than a full day without rationingA16. The steady caution across sources is charging behavior and support: the paired batteries can fill out of sync and RMA help is inconsistentA1A11.
“For me the 240V output is great. I can stick it in the back of my PHEV and use the 240V output to charge at 3.3KW when I stop.”
BLUETTI EP900 + 2×B500
The EP900 is reviewed as a whole-home system, not a power station. One EP900 inverter delivers up to 9,000W, enough to run a washer, dryer, heater, and refrigerator, and with B500 modules it expands into a very large multi-day bankB1B2. Owners recharging from a rooftop array describe getting close to off-grid and cutting their utility billsB4.
The most-praised trait is the transfer: its UPS switches from grid to battery within 10ms, and one owner reported the cutover is completely unnoticeable during outagesB3. This is field experience of a hardwired home install, so read it as infrastructure feedback, not something you unbox and set on a counter, and a complete installed system runs well into five figures before installationB4.
“A whole-home system: one EP900 inverter provides up to 9,000W (18,000W with two units), enough to run a washer, dryer, heater, and refrigerator.”
Sources
bluettipower.com · bestgeneratorsolar.com · mightygenerators.com · bgr.com · offgridsource.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
- When multiple Apex 300 units (as in this 2x-B300K configuration) are charged together, owners report state-of-charge sync problems and solar input capped far below the advertised rating, which Bluetti support has called 'normal' behavior. [Apex 300 + 2×B300K · 3 entries]
- Customer/RMA support experience is inconsistent — some owners report smooth help, others describe multi-week delays and unresponsive tickets. [Apex 300 + 2×B300K · 2 entries]
- The base unit's 60V solar input ceiling and a firmware bug that drops solar detection (requiring an unplug/replug) are the two most-cited technical gripes among solar-focused owners. [Apex 300 + 2×B300K · 2 entries]
- Because the Apex 300 ships with no built-in DC/USB ports, owners and reviewers alike flag the mandatory ~$300 Hub D1 accessory as an unexpected added cost. [Apex 300 + 2×B300K · 2 entries]
- Despite being marketed as 'portable,' the unit's weight (~38kg/85lb base alone, more with B300K batteries) leads multiple sources to describe it as effectively a stationary/semi-permanent installation rather than something carried around. [Apex 300 + 2×B300K · 2 entries]
- Whole-home 9,000W output, large B500 expandability (to ~39.6kWh), 10ms UPS, and solar off-grid capability are the standout features. [EP900 + 2×B500 · 3 entries]
- A1
“When the units are charging from the grid they charge at different rates and not together... you may have one at 100% and one at 50%.”
DIY Solar Power Forum — thread 'Bluetti Apex 300 problems' · 2025-09 · [negative]
- A2
“I have requested a short video from Bluetti showing an APEX 300 actually charging more than 1200 watts. They have been unable to produce one.”
DIY Solar Power Forum — thread 'Bluetti Apex 300 problems' · 2025-09 · [negative]
- A5
“For me the 240V output is great. I can stick it in the back of my PHEV and use the 240V output to charge at 3.3KW when I stop.”
DIY Solar Power Forum — thread 'Bluetti Apex 300 launched today… anyone have thoughts?' (page 2) · 2025-05 · [positive]
- A8
“The 60V solar limit is the most common and vociferous complaint, with users calling it "misleading" and a "joke".”
BIKMAN TECH blog aggregating user/forum reports — 'Bluetti APEX 300 - Everything You Need to Know' · 2025-11 · [negative]
- A10
“widespread frustration over the "unbundling" strategy and the "hidden cost" of the Hub D1 for "missing" DC/USB ports.”
BIKMAN TECH blog aggregating user/forum reports — 'Bluetti APEX 300 - Everything You Need to Know' · 2025-11 · [negative]
- A11
“Customer support is dangerously polarized. User experiences range from "great" and "helpful" to "notoriously non-existent" and "a disaster".”
BIKMAN TECH blog aggregating user/forum reports — 'Bluetti APEX 300 - Everything You Need to Know' · 2025-11 · [mixed]
- A12
“it weighs in at 38kg, and is probably much too big and heavy for most people to carry alone.”
Trusted Reviews — 'Bluetti Apex 300 Review' · 2025-10 · [mixed]
- A13
“Even that is quite a lump though! Keep us posted @RacingSlow you may be the future of van electrics!”
VW T6 Transporter Forum — thread 'Bluetti Apex 300' (van-conversion owner discussion) · 2025-07 · [mixed]
- A16
“With some portable power stations, I'd have to ration power more carefully, but with this system, I could run essentials for more than a full day if I needed to.”
Techspective — 'Bluetti Apex 300 with B300K Review' · 2025-09 · [positive]
- A17
“Not having DC or USB ports on the face is a tradeoff. The Hub D1 solves the problem—but it's an additional $300 accessory that you then have to bolt on after the fact.”
Techspective — 'Bluetti Apex 300 with B300K Review' · 2025-09 · [mixed]
- B1
“A whole-home system: one EP900 inverter provides up to 9,000W (18,000W with two units), enough to run a washer, dryer, heater, and refrigerator.”
bluettipower.com / bestgeneratorsolar.com — EP900 + B500 guide · 2026 · [positive]
- B2
“With B500 batteries (4,960Wh each), capacity expands from 9.9kWh up to about 39.6kWh with eight B500 modules — weeks of essential backup.”
bluettipower.com / mightygenerators.com — EP900 + B500 · 2026 · [positive]
- B3
“A fast UPS switches from grid to battery within 10 milliseconds; one owner reported the transfer is completely unnoticeable during outages.”
bgr.com / owner review — EP900 + B500 · 2026 · [positive]
- B4
“Built on reliable LiFePO4 cells; tied to solar, an owner said they can virtually go off-grid and minimize utility bills. Complete systems run roughly $14,500-$15,000 excluding installation.”
bgr.com / offgridsource.com — EP900 + B500 review · 2026 · [positive]
Research compiled July 16, 2026.
Who Should Buy Which
Buy the Apex 300 + 2×B300K if you…
- →You want the most self-contained stored energy per dollar: 8,294Wh you can plug into and even move, for under a third of the EP900's price.
- →Your use is backup and occasional solar, not a wired whole-home array, so the Apex's 3,840W and 2,400W solar are plenty.
Buy the EP900 + 2×B500 if you…
- →You're doing a permanent whole-home install with a large rooftop array and want the 9,000W solar input and 7,600W output to run the house.
- →You want the longest install horizon, 6,000 cycles and a 10-year warranty, and you'll hardwire it and leave it in place.
If neither fits
If you want something you actually carry, both are out at 214 to 343 lbs. And if you only need a few kWh of backup, both are far more system than the job requires; a single mid-size power station under 100 lbs does that for a fraction of either price.
The Bottom Line
Buy the Apex 300 unless you're actually building a whole-home solar system. It holds nearly the same energy as the EP900, plugs in and even moves, and costs under a third as much at a lower price per lifetime kWh. For stored energy per dollar in a usable box, it wins going away.
The EP900 + 2×B500 is the right answer for exactly one buyer: someone wiring a permanent install to a large rooftop array who needs its 9,000W of solar, 7,600W of output, and 10-year horizon. That's a construction project, not an upgrade. If it's not yours, the extra $7,199 buys capability you'll never connect.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Why does the EP900 cost so much more than the Apex 300 for barely more capacity?
Because the price isn't buying capacity. The EP900 holds only 1,626Wh more than the Apex, but for its extra $7,199 you get a hardwired whole-home inverter with 9,000W of solar input, 7,600W output, 6,000 cycles, and a 10-year warranty. It's a home energy system; the Apex is a power station.
Which is the better value?
The Apex 300, clearly, at $0.11 per lifetime kWh against the EP900's $0.17 and under a third of the upfront price. The EP900's longer cycle life and warranty suit a permanent install, but they don't make its energy cheaper. If value is the goal, the Apex wins.
Can I use the EP900 like a regular power station?
Not really. It has no onboard USB ports, weighs 343 lbs, and is designed to be wired into a subpanel and left in place. The Apex still behaves like a plug-in unit with USB-C and 240V outputs you can use directly, and it's the one you'd choose if you want equipment rather than an installed fixture.
Which is better for going off-grid with solar?
The EP900, by a wide margin, if you're building a real array. It accepts 9,000W of solar against the Apex's 2,400W and expands into a large multi-day bank, and owners report getting close to grid independence with it. The Apex is fine for backup with some solar, but its lower input ceiling caps how far off-grid it goes.
Do both switch over fast enough to act as a UPS?
Yes, both transfer within 10ms, quick enough for a desktop or sensitive electronics. On the EP900 one owner called the cutover completely unnoticeable during an outage. For UPS behavior specifically, they're evenly matched.
Where to buy
BLUETTI Apex 300 + 2×B300KPick
$3,699.00
$3,699.00 list · direct from BLUETTI
BLUETTI EP900 + 2×B500
$10,298.00
$10,298.00 list · direct from BLUETTI
Prices may vary by retailer and are subject to change.