Most of these specs won't change your week. A few will.
Watt-hours, surge, LiFePO4, time-to-80%. What each one means, and which ones actually decide your buy.
The one that decides it: how fast you refill.
No term matches that. Try the device instead of the spec: searching fridge, CPAP or laptop finds the terms that decide whether it runs. Still stuck? Email us the term and we'll add it.
Charging: how the energy gets back in
AC input (wall charging)+
How much power the station will accept from a wall outlet, in watts.
Why it decides things: this is your generator-free emergency exit. After a bad stretch of weather, the moment you finally reach an outlet, AC input is the whole difference between topping up over a coffee and needing to sit there all evening.
Charging time (0–80% vs 0–100%)+
How long a refill takes. Always quoted under a specific mode and a specific set of conditions, which are rarely yours.
The trap: brands lead with 0–80% because lithium takes charge quickly up to that point and then slows down on purpose to protect the cells. The last stretch is the slow one by design, so any 0–80 figure flatters the unit. Plan around the part of the curve you can actually repeat.
Charging modes (normal / turbo / fast)+
Settings that trade charging speed against fan noise and heat.
What to check: whether you can realistically use the fast one. Turbo may want a stronger outlet than the pedestal you're plugged into, and it is loud. A mode you'd never run at 10pm is not a mode you own.
Power factor (PF)+
How cleanly a device draws AC power. Motors, compressors and some medical devices (CPAPs, fridges) draw messy: they pull more than the wattage label suggests.
What it costs you: a 100W CPAP with poor power factor can pull 150W+ from your inverter, and some inverters refuse to start motor loads at all. If a device cycles oddly or trips your inverter, this is usually why.
Pass-through charging+
Running your devices while the station itself is charging.
The trap: it quietly breaks your recovery math. Part of that input is feeding the fridge instead of refilling the battery, so the percentage climbs slower than the charger's rating says it should, and you blame the charger.
UPS / EPS+
Keeps power flowing to whatever is plugged in when shore power drops out. How fast and how cleanly it hands over varies a lot between brands.
What to check: the switchover behavior, not the acronym. Brands use both sets of letters loosely, so read what the unit actually does before trusting it with anything sensitive.
Battery: what you're actually buying
Wh (watt-hours)+
Energy capacity. The headline number on every box and the one most people shop by.
Why it's the wrong headline: Wh tells you how long, not how quickly you get it back. Two stations with identical Wh can run completely different weeks. Our full-time picks start at 700Wh+; weekend and light use can run smaller.
Usable capacity+
The energy you actually get to spend, which is not the number on the label. The inverter takes a cut converting to AC, loads pulse instead of pulling steady, and you'll want to leave a reserve rather than run to zero. Plan around roughly 70–80% of label.
Why it decides things: on a 700Wh station that's about 560Wh, which is a different purchase than the one printed on the box. Two units with the same Wh can feel nothing alike in use. See what 700Wh actually runs for the felt picture.
Cycle life (to 80%)+
Roughly how many charge cycles before the pack settles at about 80% of its original capacity. Definitions vary between manufacturers.
What to check: what threshold the number is quoted to. Two "6,000 cycle" claims measured differently aren't the same claim, and none of them are a promise.
LFP vs NMC (LiFePO4)+
The two lithium chemistries you'll run into. LFP (lithium iron phosphate, also written LiFePO4) and NMC (nickel manganese cobalt) trade off different things.
Why it decides things: LFP is the default for van life. It lasts far longer, often 6,000+ cycles against roughly 500 for older NMC, handles heat better, and is harder to push into thermal failure. NMC packs more energy into less space, which matters for a laptop, not for something living in your van.
The tell: if a listing doesn't name the chemistry, assume NMC.
Output: what will and won't start
Continuous output (watts)+
The steady AC power the inverter can supply without complaint.
What to check: add up what runs at the same time, not everything you own. Go past this number and the station trips, usually at the least convenient moment.
Surge / peak output+
A brief burst of higher output the inverter can hold while a motor spins up.
Why it decides things: fridges, pumps and some tools spike hard at startup and then settle to a fraction of it. This is the spec that decides whether your fridge starts at all, which is a yes or no rather than a matter of degree. Real behavior varies between units, so leave headroom instead of buying exactly to the number.
Pure sine wave+
An inverter waveform close to what a house outlet delivers, rather than a blockier approximation of it.
What to check: if a listing doesn't say pure sine, treat the silence as the answer. Sensitive electronics and motor loads are the ones that care.
12V / DC output+
Powering things directly at 12V instead of routing them through the inverter and back down to DC.
What it saves you: the conversion cut. A fridge or fan run on DC skips a tax you'd otherwise pay every hour it runs, which adds up on the loads that never turn off.
Solar: the part that depends on weather
Solar input (watts) / MPPT+
How much panel the station will accept, and how well its controller pulls usable power out of whatever the panels are managing at that moment.
The trap: the rated input is a ceiling, not a forecast. Weather decides what you actually get. Don't build a recovery plan on solar alone if your climate is inconsistent; see solar vs. alternator charging.
Series vs parallel (panels)+
How panels are wired together, which changes the voltage and current the station sees.
Where we stop: we don't publish wiring instructions. Know the term, then follow the manufacturer's guide for your exact panels and unit.
Recovery: the terms that decide your week
These aren't on any spec sheet. They're the ones that determine whether the setup holds.
Time to Recover+
The hours it takes to put back enough usable energy to run normally again after a rough day. Not "how big is the battery" but "how fast can I undo yesterday".
Why it decides your week: a big battery with a slow refill raises the cost of every bad day. A smaller one that refills fast forgives them. When outlet access is short, the unit that recovers quickly gets your week back sooner, whatever the capacity says. It's the metric this whole site is built on: recovery-first van life.
Drift+
Spending more per day than you put back. Not a failure, just a slow slide, which is exactly why it's easy to miss until the number is low enough to be a problem.
What to do: stop one leak, put your baseline into one sentence, and defend one recovery window tomorrow. The daily mode system is built for this.
Recovery window+
The time you can realistically refill in: outlets you can reach, hours you're driving, sun you actually get rather than sun you hoped for.
Why it decides things: your system is only as stable as the window you can repeat. A short window you get every day beats a long one you only get on Sundays.
Bad-week protocol+
The plan you follow when weather or your schedule breaks the routine. Decided ahead of time, so you're not rationing power and improvising at the same moment.
Where it lives: Van Power Upgrade Guide → bad-week protocol accordion.
Quiet hours constraint+
The hours when refilling isn't really an option: campground rules, a neighbor twenty feet away, or simply not wanting to announce that someone's in the van.
Why it decides things: your fast charger is only as fast as the mode you're willing to run at 11pm.
Reading our numbers
Spec / Reported / Measured / Estimate (our claim labels)+
Every figure on this site carries one of four labels, so you always know how much weight it's carrying.
- Measured: tested firsthand. Real numbers from our own unit, in our rig, in real climates.
- Spec: manufacturer claim, taken from the spec sheet or product page. Cited and linked. Useful for comparison.
- Reported: third-party. Cited from a credible reviewer, independent test, or a consistent community pattern.
- Estimate: a modeled assumption, based on real-world experience and clearly flagged. Labeled, never guesswork.
Why you care: a "measured" charge time and a "spec" charge time are not the same promise. Order of trust: measured → spec → reported → estimate. Full method on how we test and label claims.