Specifications checked against manufacturer pages on 2026-08-23.
Anker SOLIX C2000 Gen 2: 2,048 Wh of LFP cells behind a 2,400 W continuous inverter, in the 2 kWh-class size. Checked against the maker’s page on 2026-08-23: every published figure, the runtimes those figures imply, and the specifications Anker SOLIX does not publish at all. Nothing here is a bench result, and each calculated number says so on its own row.
In short. 2,048 Wh in the 2 kWh-class band: $0.49/Wh at the list price we recorded; 49.1 Wh per pound; 4,000 rated cycles to 80%. On our assumptions a full-size refrigerator calculates to 31–34 hr, and a 40 W CPAP calculates to 36–42 hr. The runtime figures are calculated, not measured.
Check the current price
That link points at the base unit we transcribed, not a kit with panels. Amazon prices change daily.
Who it is for, and who should skip it
The published figures answer this before any opinion does.
It fits if
- A refrigerator is what you are saving. It clears a 12-hour outage on our assumptions with about 19 hours to spare, and the stated 4,000 W surge covers a roughly 900 W start.
- One night of uninterrupted medical equipment. A 40 W machine without a humidifier runs the night with margin, and the maker states up to 10 ms on the grid handover. A heated humidifier changes that arithmetic.
- Your outages run past a day. Up to 800 W of solar input is what decides whether day two starts full or empty.
Skip it if
- You want resistive heat. A 1,500 W heater empties this unit in about 1.2 hr. That is physics, not a flaw in this model.
- It has to travel. At 41.7 lb this needs two people or a cart; it lives where you put it.
- You own a large array already. It takes at most 800 W of solar; panels past that ceiling idle rather than charge it faster.
Every published specification
Numbered notes give the source location or a caveat where a figure needs one. “Manufacturer does not state” marks an absence on the maker’s page; “Not yet verified by CalmWatt” marks one of ours.
| Specification | Anker SOLIX C2000 Gen 2 |
|---|---|
| Rated capacity | 2,048 Wh1 |
| Usable capacity (calculated)* | 1741–1843 Wh |
| Continuous AC output | 2,400 W2 |
| Surge output | 4,000 W3 |
| Full recharge from wall | 88 min4 |
| Cell chemistry | LFP5 |
| Rated cycle life | 4,000 cycles to 80%6,7 |
| UPS switchover | ≤10 ms8 |
| Expandable | Yes, up to 4,096 Wh9,10 |
| Max solar input | 800 W11 |
| Max AC charging input | 1,800 W12 |
| AC outlets | 513 |
| Highest USB-C port | 140 W14 |
| App control | Yes15 |
| Stated noise | 30 dB16 |
| Warranty | 5 years17 |
| Weight | 41.7 lb18 |
| Manufacturer list price when checked | $999.9919 |
* Rated capacity × an assumed 85–90% conversion efficiency. Ours, because nobody publishes one.
Notes on the figures
- C2000 Gen 2, rated capacity: Specs tab, BATTERY section. Page title also reads ‘2,048Wh | 2,400W’. User guide: ‘Rated Battery Capacity 51.2VDC / 40,000mAh / 2,048Wh’.
- C2000 Gen 2, continuous output: Product-page FAQ Q3. Specs tab: ‘AC Output (NEMA 5-20R) 120V~ 20A Max, 60Hz, 2400W Max’. The bi-directional inlet port is limited to 1,800W.
- C2000 Gen 2, surge: Specs tab OUTPUT section; also ‘Massive 4,000W Peak Power: Power appliances with 2,400W rated power and up to 4,000W peak.’ and embedded data ‘AC Surge Output: 4,000W’. Separately, the user guide describes a resistive-load boost mode: ‘The power station supports the SurgePad™ feature for up to 3,000W AC output.’ The 4,000W figure is the conventional peak rating, not the SurgePad number.
- C2000 Gen 2, full recharge: From the ‘6 Ways to Recharge’ section; AC wall charging only. The headline ‘80% in 45 minutes, 100% in 58 minutes’ and the comparison-table ’45 Min to 80%’ apply to AC + solar combined (‘AC+ Solar recharge 2,600W, 100% in 58 Min’). Page footnote: ‘Data based on Anker internal testing. Actual performance may vary depending on the usage environment.’
- C2000 Gen 2, cell chemistry: Specs tab. Embedded product data spells it out as ‘Battery Chemistry: LiFePO4’ (lithium iron phosphate).
- C2000 Gen 2, cycle life: Comparison table, C2000 Gen 2 column; Specs tab: ‘Cycle Life 4000 Cycles’.
- C2000 Gen 2, cycle life: 4,000 Cycles to 80% Capacity
- C2000 Gen 2, UPS switchover: Specs tab states 10 ms; the user guide says it switches within 10 ms, so we treat it as an upper bound.
- C2000 Gen 2, expandable: FAQ Q4: ‘Yes. It can be paired with Anker SOLIX BP2000 (Gen 2) to expand capacity.’ Embedded data: ‘Expansion Battery Quantity: 1× BP2000(Gen 2)’.
- C2000 Gen 2, expandable: Exact figure is from the page’s embedded product data (not the rendered spec tab); the rendered page says ‘Up to 4kWh’ and the bundle card on the same page reads ‘C2000 Gen 2 with Expansion Battery 4,096Wh | 2,400W’. Consistent with 2,048Wh unit + one 2,048Wh BP2000 (Gen 2).
- C2000 Gen 2, solar input: Specs tab INPUT section. User guide: ‘XT-60 Input 11V-28V 8.2A, 28V-60V 17A Max, (800W Max)’. Recharge section: ‘Solar Input 800W, 100% in 3 Hr’.
- C2000 Gen 2, AC input: 1,800W / 15A is time-limited (< 3 hours); continuous AC input is rated at 12A (~1,440W at 120V).
- C2000 Gen 2, AC outlets: The count comes from embedded product data and it is unclear whether it includes the TT-30R RV outlet; we do not award a check mark on this row.
- C2000 Gen 2, USB-C: Highest single USB-C port. Three USB-C ports total: 2× 140W (USB-C1, USB-C2) and 1× 15W (USB-C3); the 15W USB-C and 12W USB-A share a 20W cap when used together.
- C2000 Gen 2, app: Product page spec data and the user guide: Wi-Fi and Bluetooth app control.
- C2000 Gen 2, noise: Comparison table, C2000 Gen 2 column; stated as 30 dB at loads under 1,000 W.
- C2000 Gen 2, warranty: Warranty 5 Years
- C2000 Gen 2, weight: Comparison table, C2000 Gen 2 column; product bullet also says ‘Weighing 41.7 lb, 25% lighter than the industry average.’ Specs tab gives only ‘Net Weight 18.9 kg’.
- C2000 Gen 2, price: Manufacturer list price when checked.
What no maker states
What a maker leaves out is a fact about the product too. What remains unanswered is a category-wide blank rather than this maker’s. That is unusual: 29 of the 34 units we have transcribed omit at least one figure, and this one omits none.
- Usable capacity. Nobody states this, here or elsewhere. The rating describes the cells, not the outlet, and the difference depends on what you plug in.
It is the one number every spec sheet in this category leaves out, and the one a buyer most wants. We show our arithmetic instead of pretending the figure is published.
What it runs, and for how long
The appliance set is fixed across the site, which is what makes these hours comparable with any other page here.
| Appliance | C2000 Gen 2 |
|---|---|
| Full-size refrigerator 150 W, 900 W start, 35% duty · eff. 80%–87% |
31–34 hr |
| Mini fridge 70 W, 400 W start, 30% duty · eff. 70%–82% |
2.8–3.3 days |
| CPAP without humidifier 40 W · eff. 70%–82% |
36–42 hr |
| CPAP with heated humidifier 95 W · eff. 70%–82% |
15–18 hr |
| Gas furnace blower 400 W, 1600 W start, 40% duty · eff. 80%–87% |
10–11 hr |
| 1/3 hp sump pump 500 W, 1800 W start, 15% duty · eff. 85%–90% |
23–25 hr |
| Router and modem 20 W · eff. 70%–82% |
3.0–3.5 days |
| Laptop 60 W · eff. 70%–82% |
24–28 hr |
| 1500W space heater 1500 W · eff. 85%–90% |
about 1.2 hr |
Calculated, not measured: hours = rated Wh × efficiency ÷ (appliance W × duty). Assumptions: How we verify. “Unlikely to start” means the start-up surge exceeds the stated surge rating.
The same specs, normalized
| Measure | C2000 Gen 2 |
|---|---|
| Cost per watt-hour | $0.49/Wh |
| Watt-hours per pound | 49.1 Wh/lb |
| Surge headroom | 1.67× |
| Recharge rate | 23.3 Wh/min |
| Rated cycle life | 4,000 cycles to 80% |
| Continuous watts per dollar | 2.40 W/$ |
A ratio means something only against another unit’s, so pair these with the head-to-head pages below. Definitions: How we verify.
What those figures actually mean
Cost per watt-hour: $0.49/Wh. The $999.99 list price we recorded over 2,048 Wh of rated capacity. Capacity alone tells you nothing about value. This does, and it moves every time the price does.
Watt-hours per pound: 49.1 Wh/lb. 2,048 Wh in 41.7 lb makes this a cart-or-two-people unit. These cells are heavier per watt-hour than the ones they replaced, and last far longer. That is the trade the cycle rating prices.
Surge headroom: 1.67×. A stated 4,000 W surge over a 2,400 W continuous rating, which covers the roughly 900 W a full-size refrigerator needs to start. A unit with hours to spare and no headroom fails in the first second.
Recharge rate: 23.3 Wh/min. A full wall charge in 88 minutes. Over a long outage, refill speed decides how long an engine runs or a cord stays borrowed.
Rated cycle life: 4,000 cycles to 80% capacity. At one cycle a week that is roughly 77 years away, which is another way of saying something else will retire this unit first unless you cycle it daily. The percentage matters as much as the count: two ratings only compare when they name the same remaining capacity.
Continuous watts per dollar: 2.40 W/$. This one moves opposite to cost per watt-hour on most units, so a unit can look good on exactly one of them.
Where it sits in our database
Read against our own database rather than against the maker’s marketing, the figures place like this.
| Measure | C2000 Gen 2 | Among verified units |
|---|---|---|
| Rated capacity | 2,048 Wh | 8th largest of 34 |
| Continuous AC output | 2,400 W | 8th highest of 34 |
| Cost per watt-hour | $0.49/Wh | 8th cheapest of 32 |
| Watt-hours per pound | 49.1 Wh/lb | 3rd densest of 34 |
| Weight | 41.7 lb | 23rd lightest of 34 |
These positions describe size and price, not fitness for your outage. The row built on price uses the manufacturer list price recorded on 2026-08-23; the retail price behind our link moves independently, so recompute that row against what you are shown.
Three outages, and the figure that decides each
- One night, one CPAP. A 40 W CPAP without a humidifier calculates to 36–42 hr. The stated up to 10 ms handover is what decides whether the machine notices the outage.
- Twelve hours, one refrigerator. A typical full-size refrigerator calculates to 31–34 hr, and the stated 4,000 W surge covers its roughly 900 W start.
- The loads people forget. A gas furnace blower calculates to 10–11 hr and a one-third horsepower sump pump calculates to 23–25 hr. Both are hard-wired in most houses, which makes this an electrician’s question before it is a battery one. A router and modem, meanwhile, calculates to 3.0–3.5 days.
- Three days, with something to recharge from. A full wall recharge takes 88 minutes, and it accepts up to 800 W of solar, so day two turns on your panels and your sky.
The C2000 Gen 2 against other units
A single unit’s ratios mean little alone. These 1 head-to-head pages put the C2000 Gen 2 against another unit on the same figures.
Questions people ask about the C2000 Gen 2
Every answer below comes from the tables above.
How long will the C2000 Gen 2 run a refrigerator?
31–34 hr on our assumptions for a typical full-size unit at 150 W running and a 35% duty cycle. The stated surge covers the roughly 900 W start. Substitute the wattage from the label inside your door.
Can the C2000 Gen 2 run a CPAP all night?
Yes on capacity: a 40 W machine without a humidifier calculates to 36–42 hr against the eight hours a night usually needs. The maker states up to 10 ms on the handover. Add a heated humidifier and the hours roughly halve.
How long does the C2000 Gen 2 take to recharge?
88 minutes from a wall outlet on the maker’s figure, with up to 800 W accepted from solar. That is the figure that matters once the outage passes a day.
How much does the C2000 Gen 2 weigh?
41.7 lb on the maker’s figure, or 49.1 Wh of rated capacity carried per pound. That is a cart-or-two-people unit, which is why units this size tend to stay where you put them.
How many cycles is the C2000 Gen 2 rated for?
4,000 cycles to 80% of original capacity, on LFP cells, which is roughly 77 years at one cycle a week. A figure quoted to a different retention level is a different promise, not a better one.
Can you expand the C2000 Gen 2’s capacity?
Yes, to a stated 4,096 Wh with the maker’s expansion battery, up from 2,048 Wh alone. Expansion batteries are announced earlier than they ship; check availability.
Check the current price
That link points at the base unit we transcribed, not a kit with panels. Amazon prices change daily.
Related reading
The honest comparison is not with a bigger battery but with an engine: a 1,500 W space heater empties it in about 1.2 hr, yet nothing here vents carbon monoxide into a garage. How often gasoline generators kill indoors — and how the official count keeps being revised — is documented in our CPSC revision matrix, while our refrigerator hub ranks every unit we have verified on the same twelve hours.
Ordering before a storm? Check the arrival date at checkout — a unit that ships tomorrow can beat a better one that ships next week. Amazon Prime includes fast delivery on eligible items and starts with a free trial; we earn a commission if you join.
Sources and method
- Anker SOLIX C2000 Gen 2: manufacturer product page, checked 2026-08-23.
Every quoted number comes from the maker’s page with its source sentence recorded. Every calculated number is marked as such and uses the formula above. Method: How we verify. More: Comparisons.