What satellite terminals actually draw
Satellite internet is the most power-hungry way to stay online, and the spread between terminals is wide enough that averages can mislead you:
- Compact terminals — a Starlink Mini-style satellite internet terminal and similar portable units — typically draw around 20–40W in routine use.
- Standard residential dishes commonly run 50–100W or more, with draw varying by activity: acquiring satellites after power-up, heavy traffic, and firmware behavior all move the number.
- Cold-weather features are the wildcard. Many dishes include heating to shed snow and ice, and when it kicks in, draw can climb far above the routine range for as long as the weather lasts.
Those are planning ranges, not promises — power behavior differs by model, firmware, and configuration, so verify your own terminal before buying a battery for it. A watt meter over a normal evening of use is the gold standard; the manufacturer’s specifications are the fallback. Note that the terminal usually includes its own router in these figures, but anything else you power alongside it — laptops, lights, a mesh node — needs its own line in the budget. The device wattage library covers those.
Sizing for an evening vs all day
Multiply watts by hours, then allow for conversion losses (about 15%) and a 10% reserve. Worked out for a compact terminal at 30W and a standard dish at 75W:
| Use window | Compact terminal (~30W) | Standard dish (~75W) |
|---|---|---|
| Evening (4 hours) | ~160Wh | ~390Wh |
| Waking day (12 hours) | ~470Wh | ~1,175Wh |
| Around the clock (24 hours) | ~940Wh | ~2,350Wh |
The shape of the table is the lesson. A compact terminal used for an evening fits the small end of the power station market, while a standard dish running continuously demands the largest units made — a difference of more than tenfold in battery cost. Before you buy capacity, decide how many hours of connectivity you actually need, then run your own wattage through the power station sizing calculator.
If continuous coverage matters but capacity is tight, duty-cycling works well with satellite: power the terminal for scheduled windows and shut it down between them. The trade-off is that each power-up costs a few minutes of reacquisition (at elevated draw) before service returns, so windows shorter than half an hour waste a meaningful fraction of their energy on booting.
Cut the inverter out where you can
Satellite terminals are natively DC devices — the AC adapter exists for convenience. That makes them a prime candidate for DC-direct powering, where the terminal runs from a power station’s DC output instead of through its AC inverter.
The savings come from two places. Inverters lose a slice of every watt-hour in conversion, and they burn additional power just being on — overhead that runs all night whether the terminal is busy or idle. At terminal-scale loads over 12–24 hours, skipping both can add hours of runtime from the same battery.
The cautions matter more here than with a Wi-Fi router, because terminals are expensive and their power requirements are specific. Only go DC-direct where the manufacturer supports DC input for your model, match the required voltage and wattage exactly, and use a purpose-made cable kit rated for the current involved — long, thin DC cables lose voltage, and an underpowered terminal behaves erratically. If your terminal has no supported DC path, run it on AC and simply size the battery a bit larger.
Pairing with solar for off-grid use
Satellite internet plus solar is a natural pairing — both work anywhere with open sky — but the arithmetic needs honesty. A 100W panel in reasonable conditions yields roughly 315Wh per day after real-world losses (about 4.5 peak sun hours at 70% effective efficiency). Compare that to the table above:
- A compact terminal used a few hours a day consumes less than a 100W panel produces — a genuinely sustainable loop with a mid-size station as the buffer.
- A standard dish running all day consumes well over 1,500Wh daily, which demands several hundred watts of panel, good sun, and a large battery to bridge overnight and cloudy days.
Size the panel against your daily consumption, not against the battery’s capacity — a big battery with a small panel just drains more slowly. The solar recharge calculator does the daily-yield math for any panel and battery combination, and the solar panel sizing guide explains why real yield lands so far below the sticker wattage.
Weather and obstruction realism
Two field realities deserve a place in your plan. First, weather couples your failure modes: the same storm that knocks out grid power also cuts satellite throughput and slashes solar harvest. A plan that needs strong sun and clear sky on the same day it needs backup power has no margin exactly when margin matters — size the battery to carry you through the storm, and treat solar as the recovery tool afterward.
Second, obstructions quietly tax both connectivity and energy. A terminal with trees or structures in its view drops connections and works harder, and in winter, dish heating can dominate the energy budget outright. Site the terminal with the clearest sky you can, and if you expect snow, budget for the heater — or plan to clear the dish by hand and keep heating features off while on battery, where your terminal allows it.
For how a satellite fallback fits alongside your primary connection and cellular options, see the backup internet power planning walkthrough.
Next steps
- Size a battery for your terminal’s real draw with the power station sizing calculator.
- Check panel-to-battery math with the solar recharge calculator.
- Compare mid-size stations, panels, and cable kits in the comparison hub.