Add the watt-hours each thing uses in a day, watts times hours, and divide by 0.85. A 12 V fridge running all day, a Starlink Mini for 6 hours and a CPAP with its humidifier for a night come to about 1,286 Wh.
Camping loads from the makers’ specs
The power use of common camping gear, from each maker
Gear
Power
From
Engel MT45 fridge-freezer
6.5 to 28.2 W (0.54 to 2.35 A at 12 V)
Engel
Starlink Mini
25 to 40 W on average
Starlink
Starlink Standard kit
75 to 100 W on average
Starlink
ResMed AirSense 10 CPAP
7 Wh an hour
ResMed
ResMed AirSense 10 CPAP with humidifier
22 Wh an hour
ResMed
A worked day
One day’s watt-hours for a fridge, a Starlink Mini and a CPAP
Gear
Power × hours
Wh
Engel MT45 fridge, at its top draw
28.2 W × 24 h
676.8
Starlink Mini, at its top average
40 W × 6 h
240
ResMed AirSense 10 CPAP with its humidifier
22 Wh an hour × 8 h
176
Total, then ÷ 0.85
1,092.8 Wh ÷ 0.85
1,286
The fridge line takes Engel’s top draw for all 24 hours. Engel gives a range, from 6.5 to 28.2 W, so the real day may use less. For gear that runs the same hours, type the watts as a sum, such as 28.2 + 40, in the power station size calculator.
DC outlets
Engel’s MT45 runs on 12 or 24 V DC as well as 110 or 120 V AC, and Starlink rates the Mini’s input at 12 to 48 V. Bluetti says a DC-to-DC kit on a station’s 12 V or 48 V port skips the inverter, which can bring efficiency to 90% or higher.
Cold and heat
Jackery gives the Explorer 300’s working range as -10 to 40 °C (14 to 104 °F). Look up the range for your own station in its manual.
Common questions
Is a 500 Wh power station enough for a 12 V fridge?
Not for an Engel MT45 at its top draw for a whole day, which needs 797 Wh: 28.2 W × 24 h ÷ 0.85. Engel's lower draw of 6.5 W would need 184 Wh.
Loads come from Engel’s, Starlink’s and ResMed’s own specifications; the 0.85 factor and the temperature range from Jackery, EcoFlow and Anker SOLIX, and the DC note from Bluetti, all read on October 25, 2026. Checked against published data from Starlink, Jackery, EcoFlow, Anker SOLIX and BLUETTI (plus 2 more).
See all 8 sources
Jackery, Explorer 300 Portable Power Station (product page and FAQ)
EcoFlow blog, How Long Will a 3000-Watt Solar Generator Run?
Anker SOLIX blog, How Long Will a Power Station Last?
BLUETTI blog, How Long Can BLUETTI Power Starlink?
ResMed, Power consumption of Air10 devices (1018673/1, PDF)
Engel, MT45 Platinum Series 12/24V DC and 110/120V AC Fridge-Freezer (product page)
Starlink, Standard Kit specifications (PDF)
Starlink, Mini and Mini X specifications (PDF)
Battery sizes come from battery makers' datasheets and device makers' own manuals and help pages. Check your device's manual or the old battery before you buy. If anyone may have swallowed a battery, call the National Battery Ingestion Hotline at 1-800-498-8666 or your poison center at 1-800-222-1222 straight away.