Starlink Mini Battery Runtime: Watt-Hours Per Hour, Overnight Amp-Hours From 12 V, Battery Bank Sizing and Solar Recharge for RV, Van and Off-Grid
Sep 10, 2026
Summary: A Starlink Mini draws 20 to 40 W in normal use: about 22 W idle and connected, 25 to 30 W under typical browsing and video, 35 to 40 W during heavy download or with the router loaded, and peaks near 45 W during boot and satellite acquisition; the snow-melt heater is not present on the Mini. Averaged over a day of mixed use that is about 28 W, or 0.67 kWh per 24 hours. At 12.6 V that is 2.2 A average, 53 Ah per day and about 20 Ah for an 8-hour overnight on native DC. Through a 120 V inverter add 25 to 40 percent for conversion loss and the inverter's own idle draw, so 70 Ah per day. A 100 Ah lithium bank runs the Mini alone for about 45 hours; a 95 Wh portable pack for 3 to 4 hours. 200 W of solar in average sun replaces a day of Mini use with margin.
Measured draw by state
| State | Power | Current at 12.6 V | Notes |
|---|---|---|---|
| Boot and satellite acquisition | 40 to 45 W | 3.2 to 3.6 A | First 2 to 5 minutes after power-up |
| Connected, idle, no clients | 20 to 23 W | 1.6 to 1.8 A | The overnight floor |
| Light use, browsing, one video stream | 25 to 30 W | 2.0 to 2.4 A | Typical evening |
| Heavy use, multiple streams, large download | 33 to 40 W | 2.6 to 3.2 A | |
| Cold ambient below 0 C | plus 3 to 5 W | Electronics warm-up; no dish heater on Mini | |
| Sleep schedule (app), dish off | 0 W | Set overnight hours in the app to save the 20 W floor | |
| Standard Gen3, for comparison | 75 to 100 W | 6 to 8 A | Plus 50 W heater in snow |
Power at the battery is higher than power at the dish by the converter's efficiency: a good 12 V to USB-C PD or DC-DC step-up runs 90 to 94 percent, so multiply dish watts by 1.08 for battery watts. The figures below include it.
Daily energy and amp-hours from a 12 V bank
| Use pattern | Average W at dish | Wh per 24 h at battery | Ah per 24 h at 12.6 V | Ah per 8 h overnight |
|---|---|---|---|---|
| Idle most of the day, evening streaming | 24 W | 620 Wh | 49 Ah | 17 Ah |
| Remote work, video calls, evening streaming | 30 W | 780 Wh | 62 Ah | 19 Ah |
| Family, four devices, continuous | 38 W | 985 Wh | 78 Ah | 22 Ah |
| Any of the above with a 10-hour sleep schedule | — | subtract 240 Wh | subtract 19 Ah | 0 Ah overnight |
| Any of the above through a 120 V inverter | — | add 25 to 40 percent | add 15 to 30 Ah | add 5 to 8 Ah |
Runtime by battery
| Battery | Usable Wh | Runtime at 28 W average | Runtime at 40 W heavy |
|---|---|---|---|
| 95 Wh portable pack (19 V output, no converter loss) | 90 Wh | 3.2 h | 2.3 h |
| Group 27 AGM 100 Ah, 50 percent depth | 600 Wh | 20 h | 14 h |
| 100 Ah LiFePO4, 90 percent depth | 1,080 Wh | 36 h | 25 h |
| 200 Ah LiFePO4 | 2,160 Wh | 71 h (3 days) | 50 h |
| 300 Ah LiFePO4 | 3,240 Wh | 107 h (4.5 days) | 75 h |
| 1 kWh portable power station (rated) | 850 Wh (DC out) | 28 h | 20 h |
| 2 kWh portable power station | 1,700 Wh | 56 h | 39 h |
| Vehicle starting battery, not recommended | 200 Wh before a no-start risk | 6 h | 4 h |
These are the Mini alone. Subtract the rest of the coach: a 12 V compressor fridge is 30 to 50 Ah a day, lights and fans 10 to 20 Ah, a furnace blower 15 to 30 Ah per cold night. On a 200 Ah bank the Mini is typically a quarter of the daily budget.
Sizing a bank for the Mini plus everything else
- Add the daily Ah of every load, including the Mini at 50 to 80 Ah.
- Multiply by the number of days between charges (2 to 3 for weekend boondocking).
- Divide by usable depth: 0.5 for AGM or flooded, 0.8 to 0.9 for LiFePO4.
- Example: Mini 62 Ah + fridge 40 Ah + lights and fans 15 Ah = 117 Ah per day; two days = 234 Ah; LiFePO4 at 0.85 = 275 Ah, so a 300 Ah bank. AGM at 0.5 = 468 Ah, four group 31 batteries, which is why lithium wins for Starlink users.
Solar to run it indefinitely
Solar production is roughly panel watts × peak sun hours × 0.75 for wiring, controller and dust. At 4.5 peak sun hours (US average, spring and fall), 200 W of panel yields about 675 Wh a day, which matches the Mini's 620 to 780 Wh. Budget: 200 W of panel per Starlink Mini in average conditions, 300 W in the Pacific Northwest or in winter, 100 W in the desert Southwest in summer. Pair with an MPPT controller sized for the array (a 20 A MPPT handles 250 W at 12 V) and the fusing in the 12 V panel guide.
Cutting the draw
- Sleep schedule in the Starlink app during overnight hours: saves the 20 W floor, about 19 Ah a night.
- Native DC power instead of the inverter: saves 25 to 40 percent; see Starlink Mini on 12 V.
- Use the Mini's built-in Wi-Fi only when a second router is not needed; an added router is another 5 to 12 W.
- Clear sky view reduces reacquisition cycles, which run at the 40 W peak.
- Keep the DC-DC converter and the wiring sized for 3 percent drop; a starved dish reboots and re-acquires repeatedly, doubling consumption.
Quick answers
How many watts does a Starlink Mini use? 20 to 40 W depending on load, about 28 W average, 45 W peak at boot; no snow-melt heater.
How many amp-hours does a Starlink Mini use overnight? About 20 Ah from a 12 V bank over 8 hours on native DC, or zero with the app's sleep schedule; 25 to 28 Ah through an inverter.
How long will a 100 Ah lithium battery run a Starlink Mini? About 36 hours at average use with nothing else on the bank; about 20 hours on a 100 Ah AGM at 50 percent depth.
How much solar do I need for a Starlink Mini? About 200 W of panel in average sun to replace a full day's use; 300 W in low-sun regions or winter.
Conversions Tech stocks the 12 V chargers, DC-DC converters and PoE injectors that keep the inverter out of the loop, the 95 Wh portable pack, and solar panels, MPPT controllers and LiFePO4 banks for the rest of the system. Choosing the dish: Mini vs Gen3.
Draw figures are field measurements at the DC input across firmware revisions through mid-2026; Starlink's published typical is 25 to 40 W. Starlink is a trademark of SpaceX; Conversions Tech is an independent distributor of compatible accessories.
