Portable Power Glossary: 40 Essential Terms Explained

New to portable power stations? Use this plain-English A–Z reference to understand batteries, solar charging, inverter ratings and the specifications that matter when choosing a model.

Ready to size your setup? Try our free portable power calculator, or browse our buying guides.

A

AC power

Alternating current changes direction periodically. Most household plug-in appliances use AC, so a power station needs an inverter to supply them.

Ampere (A)

A unit of electrical current. For a given voltage, higher current means greater power draw; watts are approximately volts multiplied by amps.

Anderson connector

A family of DC electrical connectors sometimes used for solar or battery connections. Match connector type, polarity and electrical ratings before connecting equipment.

B

Battery capacity

The amount of energy a battery stores, usually stated in watt-hours (Wh). Usable energy can be lower after conversion losses and operating limits.

Battery cycle life

An estimate of how many charge-discharge cycles a battery can complete before its capacity falls to a specified threshold. The test conditions and threshold matter.

BMS (battery management system)

Electronics that monitor and protect battery cells, including temperature, voltage and current. Protection capabilities vary by product.

C

Car charging

Charging a power station from a vehicle’s electrical outlet or supported DC connection. Charge speed depends on the vehicle outlet and station input limits.

Charging efficiency

The proportion of input energy retained in the battery. Some energy is lost as heat and in power conversion.

Continuous output

The power an inverter can supply steadily, measured in watts. It must meet the combined running load of appliances used simultaneously.

D

DC power

Direct current flows in one direction. Batteries store and supply DC; USB and many vehicle accessories use DC.

Depth of discharge (DoD)

The percentage of stored battery capacity used during discharge. A deeper discharge uses more energy but may affect long-term wear.

Duty cycle

The share of time a device is actually running. A fridge compressor cycles on and off, so multiplying its running watts by 24 hours may overstate typical use.

E

EPS (emergency power supply)

A backup-power feature that switches selected loads to battery power after grid failure. Transfer time varies; it is not necessarily a zero-interruption UPS.

Expansion battery

An additional compatible battery module that increases a power station’s storage capacity. Not all models support expansion.

I

Inverter

The component that converts battery DC into AC for household sockets. Check continuous wattage, surge capability and waveform.

IP rating

A standardised enclosure rating for protection against dust and water ingress. Check the exact rating and test conditions; many power stations are not weatherproof.

K

Kilowatt (kW)

One thousand watts, a unit of power. A 1.5 kW kettle draws about 1,500 W while heating.

Kilowatt-hour (kWh)

One thousand watt-hours, a unit of energy. A 1 kWh battery has a nominal capacity of 1,000 Wh.

L

LiFePO4 (LFP)

Lithium iron phosphate battery chemistry, widely used for its long cycle life and thermal stability. Product design and protection systems still matter.

Lithium-ion battery

A broad family of rechargeable battery chemistries. LFP and nickel-rich lithium-ion variants differ in energy density, longevity and thermal characteristics.

M

MPPT

Maximum power point tracking: solar-charge electronics that adjust operation to harvest power efficiently from connected panels within supported limits.

N

Nominal capacity

The manufacturer’s rated stored energy under specified conditions. Actual delivered AC energy is generally lower.

O

Open-circuit voltage (Voc)

The voltage a solar panel can produce with no load. Panel-array Voc must remain within the station’s solar input limit, including in cold weather.

P

Parallel solar panels

Panels connected positive-to-positive and negative-to-negative, increasing current while voltage remains broadly similar. Input current limits still apply.

Pass-through charging

Using a power station’s outputs while it is charging. Support and operating limits vary, and sustained heat can affect battery ageing.

Peak power

A maximum short-duration output rating. It does not mean the inverter can sustain that load continuously.

Portable solar panel

A movable photovoltaic panel that generates DC electricity in sunlight. Output depends on sun angle, temperature, shade and panel rating.

Pure sine wave

An AC output waveform close to utility power, generally preferable for sensitive electronics and motor-driven devices.

R

Rated solar input

The voltage, current and wattage ranges a station accepts from solar panels. All limits must be respected, not only the wattage.

Runtime

How long a power station can operate a load. Approximate runtime equals usable watt-hours divided by average watts drawn.

S

Series solar panels

Panels connected end-to-end, adding their voltages while current remains broadly similar. Check the station’s maximum solar voltage.

Solar charge controller

Electronics regulating power from solar panels to the battery; many portable stations include an MPPT controller.

Solar irradiance

The sunlight power falling on a surface, usually measured in watts per square metre. Cloud cover and orientation affect it.

Standby consumption

Electricity used by a station or appliance while idle or waiting. It can materially reduce runtime for small loads.

Surge power

Brief extra power available to start demanding appliances such as compressors. Verify both the surge rating and how long it lasts.

T

Transfer time

The delay between loss of grid power and backup output taking over. Devices requiring uninterrupted power may need a dedicated UPS.

U

USB-C Power Delivery (PD)

A USB charging standard that negotiates voltage and power between compatible devices. Check the wattage rating of the specific port.

Usable capacity

The energy actually available to connected devices after internal reserves and conversion losses, rather than the headline nominal battery rating.

V

Volt (V)

A unit of electrical potential. Power in watts is approximately volts multiplied by current in amps.

W

Watt-hour (Wh)

A unit of energy: one watt used for one hour. A 60 W laptop running for four hours consumes approximately 240 Wh.

Go from definitions to decisions

For real-world sizing examples, read what size power station you need for camping, explore solar charging, and compare LFP versus lithium-ion batteries.

Definitions are general educational information. Always check the specifications of the exact product and appliance.