What size generator for rv in winter?

Check, uncheck or adjust the typical device list below — watts, startup surge and battery size update instantly. Numbers come from U.S. DOE, ENERGY STAR and manufacturer spec sheets, not marketing copy.

1. Check what you need to power

Refrigeration & Freezers

  • 1

Kitchen

  • 1

Heating, Cooling & Fans

  • 1
  • 1

Water & Pumps

Laundry & Cleaning

Electronics & Office

  • 2
  • 1

Medical Devices

Power Tools & Outdoor

Lighting

  • 2

2. Your sizing

Running load2,768 W
Startup peak2,968 Wdriven by 1× Portable 12V Fridge/Freezer (Dometic CFX3 45 class)
Daily energy8,330 Wh
Recommended capacity10,420 WhBasis: 1 day of typical usage, incl. 25% margin for inverter loss & battery depth of discharge
Backup duration:

Assumptions: daily hours per device follow DOE / ENERGY STAR duty cycles; capacity adds a 25% margin. Check your appliance nameplates — actual draw varies by model.

3. Best matches from our 6-brand database

  1. EcoFlow DELTA Pro 3expandable system~$2,799
    • rated 4,000W covers your 3,050W continuous load
    • surge 8,000W covers your 2,968W start peak
    • base 4,096Wh + expansion batteries (up to 12,288Wh) covers your 10,420Wh need
    • 120/240V split-phase output
    Check price →
  2. Anker SOLIX F3800expandable system~$2,199
    • rated 6,000W covers your 3,050W continuous load
    • surge 9,000W covers your 2,968W start peak
    • base 3,840Wh + expansion batteries (up to 26,880Wh) covers your 10,420Wh need
    • 120/240V split-phase output
    Check price →

Static answer (crawlable summary)

Typical device list: Portable Space Heater×1, Electric Blanket (double)×1, Portable 12V Fridge/Freezer (Dometic CFX3 45 class)×1, Starlink Mini×1, LED Bulb (60W equivalent)×2, Phone / Smartphone Charger×2, Coffee Maker×1.

Estimated from: VT Extension table (DOE-derived) · Mfr spec: Dometic · Mfr spec: Starlink · Energy Star Certified Products (bulbs) · Unbound Solar Power Table (secondary) — some household values are cross-checked class estimates (not single-model nameplates); check your own appliance nameplate before buying.

Continuous load2,768 W
Startup peak2,968 W (driven by 1× Portable 12V Fridge/Freezer (Dometic CFX3 45 class))
Daily energy use8,330 Wh
Recommended capacity10,420 Wh (25% margin included)
Minimum inverter3,050 W continuous

Frequently asked questions

What size generator for rv in winter?

For a typical setup (Portable Space Heater, Electric Blanket (double), Portable 12V Fridge/Freezer (Dometic CFX3 45 class), Starlink Mini and LED Bulb (60W equivalent), plus 2 more devices), you need at least 2,768W of continuous power. The single biggest moment is startup: when 1× portable 12v fridge/freezer (dometic cfx3 45 class) kicks on, the momentary draw peaks at 2,968W. For a full day of runtime we recommend at least 10,420Wh of battery capacity (your devices use about 8,330Wh per day, plus a 25% margin for a full day of use).

Which power stations can handle this?

Based on published specs, EcoFlow DELTA Pro 3 (with expansion batteries), Anker SOLIX F3800 (with expansion batteries) cover the 2,968W startup peak and deliver up to 1.5 days fully expanded / up to 3.2 days fully expanded of typical daily use. Check the comparison cards above for the full numbers.

Why is the startup surge higher than the running watts?

Motor-driven devices (fridge compressors, well pumps, air conditioners) draw 2-5× their running power for a split second at startup — measured as locked-rotor amps (LRA). On this page the biggest spike comes from the Portable 12V Fridge/Freezer (Dometic CFX3 45 class): a station that only meets the running load will trip or stall when it starts. Data sources: U.S. DOE Energy Saver, ENERGY STAR certified products, manufacturer spec sheets.

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