How Much Power Does One Overlanding Night Actually Burn? (We Did the Math)

Our truck-camp setup burned 571 watt-hours from sundown to sunrise. The Jackery Explorer 1000 v2 says it has 1,070 Wh on the box. By 8 AM the display read 38%.

That gap — 1,070 Wh marked, 38% remaining after one night’s real load — is where spec sheet meets pavement. And it’s the number that decides whether you wake up at 2 AM to a dead fridge or wake to a quiet compressor.

Why Your Power Station’s Real Capacity Isn’t What the Label Says

The 1,070 Wh on a Jackery spec sheet is chemical capacity. Field capacity is lower, and here’s why.

Inverters aren’t lossless. Converting DC to AC draws power even when you aren’t using the outlet. Lithium batteries derate in cold — a battery rated 1,000 Wh at 77°F delivers maybe 80–90% of that when the air hits 40°F and the fridge compressor cycles. If you want the full breakdown on how LFP and NMC cells behave differently under thermal stress, our ice-fishing cold-weather test ran the numbers at 8°F. And the battery won’t discharge all the way to zero — most portable stations cut power around 10–15% remaining to protect cell life. That means your usable window is closer to 750–800 Wh on a 1,000 Wh station.

Add a night where ambient temperature drops and you’re pulling for 12+ hours, and a spec-sheet 1,000 Wh can feel more like 600–700 Wh in practice. The margin vanishes fast.

The Actual Watt-Hour Budget: One Overnight

Here’s the load calculation we built from field data and TaketheTruck’s camping power audit:

Device	Runtime	Watts	Total Wh
Fridge (12V, ~0.9A avg)	24 hrs	10.7	256
Vent fan (12V, 2A)	8 hrs	24	192
Laptop charging	0.5 hrs	180	90
Phone charging (2×)	2.2 hrs	15	33
Total	one night	—	571

This assumes the fridge runs continuously (realistic for 12V compressor fridges), the fan cycles for sleeping comfort on a warm night, and you top up a laptop and two phones. No extras — no heater, no hair dryer, no second fan.

On a 1,000 Wh station with 750 Wh usable, you’re above the margin. On a 500 Wh station, you’re cutting it close. On a 2,000 Wh station, you’ve got breathing room for a second night or heavier loads.

Matching Load to Station Tier

EcoFlow’s overlanding breakdown maps capacity tiers to trip patterns. It’s useful shorthand.

500Wh class — entry-level stations like the Jackery 600 v2 — handles one short night on a light load. Fridge and phones only, no fan. If you’re car camping one night a weekend near town, 500 Wh works. If you’re overnighting in remote terrain or running two nights back-to-back, you’ll be anxious by sunrise.

1000–1500Wh class — the Jackery Explorer 1000 v2, Bluetti AC180, EcoFlow DELTA 2 — covers most overlanders. One full overnight with fridge, fan, and device charging. Two nights if you’re conservative. This is the sweet spot for truck campers who spend 4–6 weekends a year backcountry.

2000Wh+ class — the Jackery 2000 Plus or larger — real margin for multi-night base camps, electric heaters, or running a second fridge. If you’re remote for a week or running a galley setup, the extra capacity justifies the weight and cost.

The Rooftop Tent Cable-Routing Constraint

RTT power isn’t like van power. Your power station lives in the cab or truck bed. Your refrigerator, lighting, and charging outlets are in or above the tent. That means cable runs — DC wiring from the station up through the tent frame, back to a junction box, out to your 12V fridge and lights. The load math is structurally the same problem van builders face, though the wiring constraints differ; our van-life watt-hour breakdown covers the usable-capacity math in detail if you’re scaling up to a full galley setup.

James Baroud’s power integration guide notes the real friction: longer cable runs = voltage drop. A 20-foot run of undersized wire will cost you 10–15% of your capacity as heat loss. Most overlanders solve this with heavier gauge 2/0 or 4/0 welding cable and a breaker panel in the tent frame, which adds weight and complexity that van setups don’t face.

Don’t assume a power station spec applies equally to RTT builds. The infrastructure cost is real.

What We’d Choose for Different Trip Patterns

If you’re car camping one night, buy a 500 Wh station. You’ll use half its capacity. If you’re overlanding backcountry 2–3 nights quarterly, a 1000–1500 Wh station pays for itself in peace of mind. If you’re establishing a base camp or running dual fridges, go 2000 Wh and move on — the debate is over.

The number that matters isn’t what the label says. It’s how many watt-hours you actually have left at 7 AM.