Tools · Size planner
Add the devices you want to run and for how long, pick how many days of backup you need, and the calculator works out your daily energy use and the station size that covers it.
Questions it answers
Each card below tells you which preset to add and which number to read. Find your question and follow the steps in the calculator above — your own numbers, your own answer.
List every device you want to run with its watts and daily hours, pick your backup days, and read the Battery needed figure in the result panel. That number — rated watt-hours at 85% usable capacity — is the size to shop for.
Enter your device list and read Daily usage. A station lasts roughly usable Wh ÷ daily Wh in days — the result card does the division for you and reports your setup in days without recharging.
Quick-add Fridge — the preset assumes 100W and 10 compressor hours, about 1,000Wh a day. Set 1 day for a short outage or more for a stretch of bad weather, then read Battery needed. If you know your fridge cycles less, lower the hours and watch the number drop.
Quick-add CPAP machine — 45W for an 8-hour night is about 360Wh, roughly a laptop plus a phone charger. Set your backup days to see what a multi-night outage really costs once the CPAP is added to everything else on your list.
Quick-add the fridge, LED lights, laptop and phone charging, set 2 days for a weekend, and read the result. Every preset is editable — trim the hours to match your actual use and the recommended size updates as you type.
Quick-add Phone charge — a full charge costs about 20Wh, so the row shows your daily charging cost in watt-hours. Put it next to the fridge row and you can see why phones barely move the total: it is the big cycling appliances that decide the size.
How it works
It turns a list of appliances into a battery-capacity number you can shop against — using the same 85% usable-capacity method behind every runtime estimate on this site. Watts tell you how fast a device draws energy; watt-hours tell you how much is in the tank. Confusing the two is the most expensive mistake in this category.
A load-planning worksheet. You list each device with its wattage and daily hours, choose how many days of backup you want, and the calculator returns your daily energy use, the battery capacity needed to cover it, and the smallest SoreinPower model that fits — no spreadsheet required.
Step by step
Quick-add the presets that match your gear — fridge, lights, laptop, CPAP and more. Something that isn't on the list? Add a custom device and name it anything, from a well pump to a gaming PC.
Every row is editable — presets come pre-filled with typical numbers, custom rows start blank. Check the device label or its spec page, and for anything that cycles like a fridge, enter the average draw rather than the startup peak.
1 to 5 days without recharging. The calculator assumes the worst case — no solar, no wall outlet in between.
Daily usage, battery needed at 85% usable capacity, and the smallest station that covers it. Watch for the output warning if one device exceeds the inverter channel.
Questions & answers
No — watts and watt-hours measure different things. Watts are how fast energy flows (what the inverter can supply at once); watt-hours are how much is in the tank (how long it lasts). A 3,300W station with a small battery dies sooner than a 600W station with a big one. Size the battery in Wh from the energy math, then check the W rating against your single hungriest appliance.
No battery delivers its full rated capacity through the inverter — AC conversion and cable losses eat roughly 15%. This is the industry's own planning factor, not our caution: Jackery publishes the same 0.85 formula on its product pages, EcoFlow's runtime guide uses 0.85, and Bluetti specs 85% inverter efficiency outright. Every SoreinPower station uses LiFePO4 cells, so there is no chemistry trade-off to model — the difference between brands is only whether they show the math.
Both, for different things. Running watts decide the energy math (watts × hours); the rated output must cover your single largest appliance, because compressors and pumps briefly surge well above their running draw when they start. The calculator flags any device whose wattage exceeds the recommended model's continuous output — the G Series handles 3,300W continuous with a 6,500W startup peak.
Check the label on the device or its power brick — it lists watts, or amps, in which case multiply by 120V (watts = amps × volts). For anything that cycles, like a fridge or AC unit, use the average draw rather than the nameplate: a plug-in energy meter over 24 hours gives the real figure.
The 85% factor already covers conversion loss, and backing up 20–30% more capacity than the bare number is cheap insurance — capacity fades as batteries age and cold weather steals usable watt-hours. If a 200–400W solar panel can recharge the station daily, one capacity step down is often enough instead. Compare the full lineup to see charge times side by side.
The G9600 tops out at 9,600Wh — beyond that, stack additional battery modules or recharge between days instead of buying one huge unit.
