Starlink off-grid power calculator

BUILD A SYSTEM AROUND YOUR DAY

How to power Starlink off grid

An off-grid Starlink setup needs three things to agree: the dish’s power requirements, the battery’s available energy, and a way to replace the energy you use. A battery with plenty of capacity can still have the wrong output. A powerful charger can still be connected to a battery that is too small for an overnight session. Work through the connection first, then runtime, then recharging.

See the two power paths, illustrated

Starlink watts, watt-hours and amp-hours: what each number means

Watts (W) describe the rate at which a device uses energy. Watt-hours (Wh) describe an amount of energy. A constant 40 W load uses 320 Wh over eight hours before any extra battery-to-output losses. A power station’s 1,000 W output rating tells you about the load it can supply; it does not tell you how many hours it will last.

Amp-hours (Ah) need a voltage before they can be compared with a power station’s Wh rating. For example, a battery rated at 100 Ah and 12.8 V stores a nominal 1,280 Wh. A different nominal voltage produces a different result. For USB power banks, use the manufacturer’s Wh figure where available; multiplying the advertised mAh by the USB output voltage can overstate stored energy.

How much power does each Starlink use?

Starlink’s AC power guidance lists average ranges of 20–40 W for Mini, 50–75 W for Standard Actuated, 75–100 W for Standard 4 / 4 X, and 110–150 W for Performance Gen 1 / Gen 2. Those figures include the kit’s router, supply and cables. They are average operating figures, not maximum or startup ratings.

The V5 specification sheet lists a 35–50 W average, while the Performance Gen 3 sheet lists 75–100 W. Keep those generations separate. Where a specification does not clearly define the measurement boundary, measure the whole setup and account for a separate router. The calculator’s source notes explain the differences between the manufacturer documents.

How long will a battery run Starlink?

Start with usable energy rather than assuming you can spend every rated watt-hour. Reserve settings, battery condition and the power station’s cutoff affect what is available. Then account for the loss between the battery and the outlet you are using. A result based on average draw should be a planning range, especially when temperature and traffic change.

As a worked example, a nominal 500 Wh battery with 90% usable energy gives a 450 Wh energy budget. Supplying a 30 W load through an assumed 85% efficient delivery path draws about 35.3 W from that budget, giving roughly 12.8 hours without recharging. These are illustrative assumptions, not a promise for a particular power station. Enter measured values to make the estimate more useful.

Daily powered hours change daily energy use, not continuous runtime. Running for eight hours and fully switching off for sixteen is different from leaving the kit idle. This calculator assumes the kit and its output are off outside the hours entered. Include any always-on networking or standby loads in a separate energy budget.

Choosing between a power bank, power station and UPS

A compact power bank can suit a portable setup when its individual output port supports the required voltage, current and protocol. Look beyond a combined wattage advertised across multiple ports. Connecting a second device may change how power is shared. Confirm the compatible Starlink cable and the power source’s specifications together.

A power station adds a larger energy store and often an AC outlet, which can let you use the kit’s supplied AC equipment. Check its rated capacity, sustained output, idle consumption and recharging options. A DC-only unit needs a verified DC or USB power route; the absence of an AC outlet matters even if its battery capacity looks sufficient.

A UPS is useful for bridging an outage, but choose it using its runtime curve at the load you expect. VA and output watts are not interchangeable with battery Wh. Do not type a UPS’s VA rating into the calculator’s capacity field. If battery energy is not specified, use the manufacturer’s runtime guidance instead of inventing a capacity.

Starlink Mini on USB-C, vehicle power and 12 V systems

For Mini, Starlink’s specification sheet states a 100 W, 20 V / 5 A USB-PD source requirement with its compatible USB-C accessory. That is a source-capability requirement, not a claim that Mini continuously consumes 100 W. Average consumption and required source output answer different questions.

In a vehicle, confirm the charger’s supported input range, the socket rating and the capability of the particular port being used. Decide whether you will charge only while driving or also draw from a parked vehicle’s battery. The calculator estimates energy; it does not assess wiring, fuses, battery isolation or engine-start reserve. Follow the equipment and vehicle manufacturers’ installation requirements.

Do not assume that a cable which physically fits converts voltage or negotiates USB Power Delivery. Direct-DC changes also alter the measurement boundary: if you enter battery-side measured watts, set delivery efficiency to 100% and overhead to zero so losses are not counted again.

How much solar do you need for Starlink?

Size solar from daily energy, local seasonal sunlight and realistic losses—not the number printed on a panel alone. Peak sun hours represent an equivalent duration at full solar intensity, not the time between sunrise and sunset. Shade, orientation, temperature and charging limits can all change what reaches the battery.

The calculator divides the higher daily energy estimate by peak sun hours and the selected harvest efficiency. That estimates a panel nameplate capacity to replace an average day’s use. It does not simulate cloudy sequences, whether charging overlaps your usage, or the extra energy needed to refill a deeply discharged battery while also running Starlink.

Use location-specific solar resources when planning. The PVWatts results guide explains why modeled production based on representative weather can differ from actual monthly output. Its grid-connected estimates are useful context for solar variability, not a guarantee of off-grid battery autonomy. Check panel voltage and current limits against your charge controller or power station separately.

Planning for a weekend, an RV or a remote cabin

For occasional travel, list the hours you actually need connectivity and every other device sharing the battery. For an RV, separate drive-time charging from parked use. For a cabin, build a full daily energy budget that includes networking and other essential loads. A Starlink-only estimate is not a whole-home battery plan.

The days-without-charging setting sizes storage for the selected daily schedule with no recharge during that period. The solar result separately sizes replacement of one day’s use. Consider those two jobs together: storage carries you through gaps in charging; generation replenishes what was used. Before a longer trip, test the complete system through a realistic workday and record its actual energy use.

Starlink off-grid power questions