Spire ESSHangzhou Xiangcai Network Technology Co., Ltd.
Runtime estimate
Estimate runtime from battery capacity and load so retail buyers can choose a practical portable power tier.
Runtime is the number your retail customer actually cares about. They do not want to decode watt-hours and inverter efficiency curves on a shelf card; they want to know whether the unit keeps their camping fridge running overnight, powers a CPAP through a four-hour outage, or tops up a phone for three days in the backcountry. The calculator above gives a fast estimate. This page explains what goes into it, why the real number at the campsite is a little shorter than the headline figure, and how to use that to choose the right capacity tier for your channel.
Spire ESS portable power stations span from compact 266 to 300Wh units in the M300 class, up through mid-range 500 to 555Wh M600 models, and into the higher-output Q1200 (1008Wh, 1200W) and Q2400 Pro (4608Wh, 2400W). The LiFePO4-based YD2400 sits at 2016Wh for longer backup windows. Each tier has a rated AC output (the maximum continuous load it can drive) and a usable capacity that sets how long it sustains that load. Matching those two numbers to the appliances your buyer plans to run is the core sourcing conversation.
What to decide before asking for price.
Runtime comes down to one division: how many usable watt-hours the station carries, divided by how many watts the appliance draws. A 500Wh station running a 100W load would theoretically last five hours. That is the nameplate calculation, and it is a useful starting point.
The real calculation adds inverter efficiency. A portable power station converts stored DC into AC through a built-in inverter, and that conversion is not free; a typical inverter runs at around 85% efficiency, so roughly 15% is lost as heat. The working formula is usable Wh divided by load watts, multiplied by the efficiency factor. For a 500Wh station at 85% running a 100W load, the practical estimate is closer to 4.25 hours, not five.
Capacity ratings are measured under controlled lab conditions: a slow, steady discharge at a moderate temperature with a known load. The real world adds variables that each shave time off the nameplate.
Temperature is the most predictable. Cold weather reduces the energy a lithium cell delivers in one discharge; a station at -10C may deliver noticeably less usable energy than the same station at 25C even with identical stored charge, and high ambient temperatures can trigger thermal management that also limits output. Buyers in cold-climate channels (ski resorts, northern camping, emergency prep) should recommend a larger tier than the simple arithmetic suggests.
Load type matters too. Resistive loads like bulbs and heaters draw a flat wattage; motor-driven loads like fridges, fans, and tools draw a higher surge at startup and then settle. A station's peak surge output decides whether it can start the motor at all; the running draw decides runtime once it is spinning. Both numbers belong in a retail comparison.
Outdoor retail channels typically sell two or three tiers rather than one model, because the buyer pool is wide. A hiker charging a phone and a headlamp has different needs from a van-lifer running a 12V fridge and a laptop together. Building an assortment around an entry tier, a mid-range tier, and a flagship tier serves both ends and creates natural upsell paths.
A practical approach is to match the station's rated AC output to the highest-draw appliance the customer is likely to run, then match capacity to the duration they need. A 300W-rated station in the M300 class (around 266 to 300Wh) is a solid entry SKU for phones, lighting, and small electronics. A 600W M600 (around 500 to 555Wh) handles a small projector, a CPAP, or a full day of laptop use. The Q1200 at 1008Wh steps up to small refrigerators and overnight camping; the Q2400 Pro at 4608Wh and the LiFePO4 YD2400 at 2016Wh suit multi-day trips, car camping, or serious emergency backup. Confirm exact specs with sales for each tier.
A camping fridge typically draws 40 to 60W steady with a startup surge of 150 to 200W. A 600W-rated station handles the surge comfortably; at 50W running draw and 500Wh usable at 85% efficiency, the working estimate is roughly 8.5 hours of continuous cooling, practical for an overnight camp. A two-day trip pushes you toward the Q1200 or larger.
A CPAP without a heated humidifier draws roughly 30 to 60W depending on pressure. A 266Wh M300-class station at 85% gives approximately 3.75 to 7.5 hours, workable for one night; a heated humidifier can push draw to 100 to 150W, cutting that estimate by half, so buyers needing humidifier support or multiple nights should step to the M600 or M700 class. All of these are planning estimates; confirm device-specific figures with the appliance maker and recommend a home test before relying on the unit in the field.
A station that recharges from a foldable panel roughly doubles its useful range: instead of depending on a wall outlet between trips, the customer tops up during the day while powering devices in the evening. This pairing is also a strong retail story, turning a one-time-use backup device into a renewable off-grid system.
Solar recharge time depends on panel wattage and sunlight, which vary by season, latitude, cloud cover, and angle. A rough planning rule is four to five peak sun hours per day in good weather. A 100W foldable panel at 100W for four peak hours adds roughly 340 to 400Wh per day after charge-path losses, enough to meaningfully extend a mid-range station on a multi-day trip but not necessarily to fully recharge a large station in one day. Buyers who want full same-day recharge for larger stations should consider a higher-wattage panel and confirm the solar input specs with sales.
The Spire ESS foldable panel range runs from 60W to 400W in the XC series, plus SC100W and SC150W portable chargers. Confirm connector compatibility between the panel and station before bundling; ask sales which panels pair directly with which models and what adapter cables ship in the package.
Capacity and runtime estimates get the buyer interested; plug standard, certification, and retail packaging close the order. A unit with the right Wh but the wrong plug cannot be sold into the target market, and a product without the required certification will fail import or retailer onboarding. Getting these into the RFQ from the start saves weeks of back-and-forth.
The Spire ESS portable range carries certification references including UL, FCC, CE, PSE, SAA, UN38.3, RoHS, and UKCA depending on the model and series. The exact set for your destination and model is confirmed by sales, not assumed from the catalog. State the destination country, the retail channel type (mass market, outdoor specialty, e-commerce, emergency preparedness), and any private-label packaging requirements in your first inquiry so the response addresses them in one pass.
| Appliance | Approximate draw (W) | Estimated runtime | Notes |
|---|---|---|---|
| Smartphone charging | 10 - 18 | 20 - 35 hrs | Typical fast-charge draw; multiple charges possible. |
| LED camp light | 10 - 20 | 20 - 40 hrs | Varies by brightness; very efficient overnight use. |
| Laptop (mid-size) | 45 - 65 | 6 - 9 hrs | Brightness and processor load affect draw. |
| CPAP (no humidifier) | 30 - 60 | 6 - 14 hrs | Pressure setting determines draw; test before relying on it. |
| Camping fridge (small) | 40 - 60 steady | 7 - 10 hrs | Startup surge may reach 150 to 200W; check rated output vs surge. |
| Small projector | 60 - 120 | 3.5 - 7 hrs | Useful for outdoor cinema or presentation use. |
| Power drill (corded) | 400 - 600 peak | Under 1 hr continuous | Short duty cycles; size to output rating, not duration. |
All runtimes are approximate estimates based on usable capacity and a typical inverter efficiency factor. Actual results depend on temperature, battery age, load type, and usage pattern. Use these figures for channel planning only; confirm real performance with a test before committing to retail copy or product claims.
Quick estimate
This estimate is for sourcing discussion only. Sales should confirm final configuration, certification, and delivery plan.
Products
Portable Power Stations / M Series Portable Power
Portable power station range for outdoor, emergency, night market, medical, and household backup scenarios.
Portable Power Stations / Q Series Portable Power
Higher-capacity LiFePO4 portable power stations for premium outdoor and backup power channels.
Portable Power Stations / Q Series Portable Power
Higher-capacity LiFePO4 portable power stations for premium outdoor and backup power channels.
Portable Power Stations / YD Series Portable Power
Portable power station range from compact 200W units to 2400W LiFePO4 backup systems.
Divide the station's usable watt-hours by the appliance draw in watts, then multiply by an efficiency factor (around 0.85 for a typical inverter). The result is an estimated runtime in hours. Real conditions (temperature, load type, battery age) affect the actual figure, so treat it as a planning range, not a guarantee.
Rated capacity is measured under controlled lab conditions. In the field, inverter efficiency losses (typically 10 to 20%), cold temperatures, motor startup surges, and mixed simultaneous loads all reduce the energy available to the appliance. Adding 15 to 20% headroom to your calculation gives a more realistic retail estimate.
Rated AC output is the maximum continuous load the station can power at any moment, in watts. Battery capacity is the total energy stored, in watt-hours. Both matter: rated output determines what appliances can run; capacity determines how long. A high-capacity but low-output station cannot start a large motor; a high-output but low-capacity station runs out quickly.
A small camping fridge drawing 40 to 60W steady typically runs 7 to 10 hours on a station with around 500Wh usable. For two or more nights without solar recharge, the Q1200 class at around 1008Wh or higher is a safer fit. Confirm the fridge startup surge against the station's rated AC output, and ask sales which models are available in your market with the required certification.
It depends on panel wattage and sunlight. A 100W panel in four peak sun hours adds roughly 340 to 400Wh per day after losses, which can extend or partially recharge a mid-range station, but a full same-day recharge for a 1kWh or larger unit typically needs a higher-wattage panel or multiple panels. Ask sales which panels pair with specific models and confirm the connector and charging input.
State the destination country, target retail channel, and any OEM or private-label requirements in the first inquiry. The Spire ESS portable range carries certification references including UL, FCC, CE, PSE, SAA, UN38.3, RoHS, and UKCA depending on the model and series. The exact certificate set, plug standard, retail carton format, and manual language for your market and model are confirmed by sales.
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