What Size Power Station for an RV

Most people shopping for an RV power station compare two numbers: the model name and the price. The model name — “1000,” “2000,” “3000” — implies a watt-hour capacity, and that’s what the whole category seems to be about. It isn’t. The number that actually decides whether your unit can run a microwave, brew a pot of coffee, or start a fridge compressor is the continuous AC inverter rating, and it has nothing to do with how full the battery is. A station with a 600W inverter trips the moment you plug in an 800W microwave — instantly, no matter how much energy is stored. Get that wrong and no amount of battery capacity saves you.

There’s a second problem layered on top: the watt-hour number on the box isn’t what you get. Independent testing consistently finds real delivered energy running roughly 10–20% below the nameplate figure, before cold weather or battery aging take their own cut. So you’re sizing against a number that overstates what you’ll actually have, for loads that the inverter may not be able to run regardless.

Here’s what this guide does: it gives you both problems in full — the inverter ceiling and the measured-capacity gap — and then walks you through how to size a unit for the life you’re actually going to live in an RV.

The Two Numbers That Actually Matter

Every portable power station has three ratings on the box or spec sheet: watt-hours (Wh), continuous AC watts, and surge watts. Most buyers fixate on the first. The second and third are what fail them.

Continuous watts is the ceiling for what the unit can power at all. If a device draws more than the inverter’s continuous rating, the unit shuts down or trips a protection circuit — not eventually, immediately. Surge watts is a brief headroom above that ceiling, available for a second or two to absorb motor startup spikes. Once the surge passes, the device has to fall back inside the continuous limit to keep running.

To make this concrete: the Bluetti EB3A is rated at 600W continuous and 1,200W surge on a 268.8Wh battery. The Jackery Explorer 1000 V2 is rated at 1,500W continuous and 3,000W surge on 1,070Wh. The EB3A physically cannot run a 1,000W+ microwave. The inverter won’t allow it. A full battery doesn’t change that equation one bit.

Now stack the measured-capacity problem on top. Independent testing by OutdoorGearLab found that the Jackery Explorer 2000 V2 delivered 1,710Wh of actual AC energy, the Anker Solix C1000 delivered 860Wh, and the Jackery Explorer 300 delivered 260Wh. Nameplate figures for those same units run higher. The EcoFlow DELTA Pro 3 came closest to its rating at 3,790Wh measured — still a gap, just a smaller one. In every case, inverter conversion losses eat into the number before energy ever reaches your device. Cold weather and battery aging reduce it further.

The practical implication: when you calculate what you need, size against the measured output range you can realistically expect — roughly 80–90% of nameplate — not the model number.

The Real Constraint for RV Loads: Heating and Compressors

Most RV devices are power-polite. A phone draws 15–30W. A tablet, 20–40W. An LED light, 10–30W. A router, 10–30W. A 32″ LED TV, 30–100W. A CPAP machine, 30–90W in normal use (more with a heated humidifier). A mini fridge runs at 40–100W once it’s cycling steadily. You can comfortably stack several of these on a mid-sized station all day.

Then there’s the cliff.

Anything that heats or has a compressor lives in a completely different tier:

• Coffee maker: 600–1,200W
• Microwave: 800–1,500W
• Small space heater: 750–1,500W

These figures are running watts from a single seller’s reference — treat them as ballpark, not hard spec — but the shape is right. A coffee maker at the low end of that range is already above what a 600W-inverter station can touch. A microwave at the high end requires a station rated at 1,500W continuous just to attempt it, and it needs headroom in the surge rating to get the magnetron started. A space heater running for hours will drain even a large battery faster than most people expect.

Fridge and pump figures deserve a separate note: the running watts above are steady-state. The startup surge when a compressor kicks on can be several times the running draw. That surge has to fit within the station’s surge rating, not just its continuous rating. An undersized inverter trips on the startup spike even when the fridge’s steady draw would have been fine.

The consistent pattern across RV setups: small and medium stations (under roughly 1,500W continuous) serve the low-draw loads well and simply cannot serve the heating and compressor loads at all. If your RV life includes a morning coffee, a microwave meal, or any serious cooking, those loads set your inverter floor — and the inverter floor sets your unit choice.

How to Estimate the Watt-Hours You Actually Need

Once you know your inverter requirement, calculate the battery capacity to back it up. The mechanics are straightforward:

1. List every device you plan to run, with its wattage and daily hours of use.
2. Multiply each device’s watts by its hours to get watt-hours.
3. Sum those figures.
4. Divide the total by roughly 0.85 to account for inverter conversion losses (this factor comes from a seller’s worked examples and is optimistic — real efficiency dips lower under light or surging loads).
5. Add at least 20% buffer on top for anything with a motor or compressor.

As a grounding example: 100W of devices running for five hours comes to roughly 588Wh of battery draw after the 0.85 loss factor — that math comes from the same seller’s framework. This is a useful starting point, not a precise engineering figure.

The RV user community takes a simpler approach: double your calculated figure. That’s a coarser rule, but it bundles surge headroom, cold-weather derating, and battery aging into one conservative margin. It isn’t contradictory to the calculation method — it’s just a more cautious version of the same logic. For multi-day off-grid use, where you’re unlikely to fully recharge between stops, the doubled figure starts to look like common sense rather than overkill.

One more adjustment: apply the 80–90% delivered-energy reality. If your calculation says you need 1,500Wh, a station whose measured output lands at 1,500Wh isn’t enough — you need the nameplate figure to be meaningfully higher than your calculated requirement, because you’re not getting all of what’s printed on the box.

Wh Tiers as Starting Points, Not Prescriptions

Some sellers map their product lines onto sizing brackets: roughly under 500Wh for phones and lights only; 500–1,500Wh for CPAP, TV, router, and a small fridge; 1,500–3,000Wh for a real fridge plus longer runtime; 3,000Wh and up for sustained RV living with cooking or AC loads. These tiers come from a single vendor’s framework, structured to move customers toward specific product lines. No independent testing has drawn the bracket boundaries.

Use them as a rough orientation, not a specification. The important thing the tiers hide — by organizing everything around Wh — is that inverter continuous-watt rating is the gating factor for the loads that actually define whether an RV station is useful. A unit can sit in the “1,500–3,000Wh” tier and still have an inverter too weak to start a microwave. Always check the continuous watt rating against your hardest load before the battery size against your runtime.

Weight Is a Real Constraint Once You’re Above 1,500Wh

Capacity and weight scale together, and above a certain point the unit stops being portable in any meaningful sense:

These are measured figures, not spec-sheet estimates. The jump from roughly 39 lbs to 114 lbs between the 1,700Wh and 3,800Wh class is stark. A unit in that top tier isn’t something you carry to a picnic table and back — it lives where you install it. For a moving vehicle, that also means securing it against road movement, which is a real installation question. If your RV needs are genuinely in the 3,000Wh+ range, factor in that the unit becomes fixed infrastructure, not portable gear.

What About Starlink and Long-Haul Internet?

Starlink Mini draws roughly 18–30W in typical use — around 18W average, with a startup spike above 30W. One forum member reported running Starlink Mini for 30+ hours on a 50Ah battery (roughly 640Wh at 12V). These figures come from a single community report, not controlled testing, so treat them as directional rather than guaranteed. The practical read: on a 500Wh station running nothing else, you’re looking at roughly a day of connectivity, with the startup spike well within most station ratings.

Two important caveats: standard (non-Mini) Starlink dishes draw substantially more power, and cold weather increases dish heating demand. If you’re on a full-size dish, the 18W average doesn’t apply — check the dish’s own power spec before sizing.

A Note on Battery Longevity Claims

LiFePO4 chemistry genuinely does last longer than older lithium formulations — that directional claim is solid. The specific headline numbers (one manufacturer cites up to 4,000 cycles to above 70% capacity for the Jackery Explorer 1000 V2) come from the manufacturer’s own datasheet and can’t be independently verified within any normal review timeframe. They’re also conditional: the 4,000-cycle figure is tied to a 70% retention threshold. A stricter 80% threshold yields a lower number. High temperatures, deep discharges, and fast charging all shorten real-world life. In an RV that sits in summer heat or winter cold, RV-specific conditions matter more than a headline cycle count.

The honest read on longevity: LiFePO4 is a good choice for long-term use. The exact number on the datasheet is a projection under ideal conditions, not a warranty.

Putting It Together

Start with your hardest load. If you want to run a microwave, a coffee maker, or a space heater, your inverter continuous rating is your first filter — you need a unit with headroom above that appliance’s running watts, plus surge rating above its startup spike. Nothing else on the spec sheet compensates for an inverter that can’t handle the load.

Once you have the inverter floor, calculate runtime by summing your devices, applying a loss factor, adding margin for motors and compressors, and then sizing the battery at least 10–20% above your calculated need to account for the gap between nameplate and measured output.

Then look at weight. If the unit that meets your power needs weighs over 40 lbs, plan for it to be permanent infrastructure, not a piece of gear you reposition.

The model number is marketing. The two specs that decide whether an RV power station actually works for you are the continuous AC watts — which sets what you can run — and the tested watt-hours — which sets how long you can run it. Shop in that order.