Product comparison · 2 power adapters & inverters

Ewent EW3974 power adapter/inverter Indoor vs Ewent EW3991 power adapter/inverter Auto

11specifications compared
8differ
3identical
16known for one product only

Key differences

Purpose
- EW3974 power adapter/inverter Indoor:Laptop
- EW3991 power adapter/inverter Auto:Universal
Power supply type
- EW3974 power adapter/inverter Indoor:Indoor
- EW3991 power adapter/inverter Auto:Auto
Power current type
- EW3974 power adapter/inverter Indoor:AC-to-DC
- EW3991 power adapter/inverter Auto:DC-to-AC
Input voltage
- EW3974 power adapter/inverter Indoor:100-240 V
- EW3991 power adapter/inverter Auto:220 - 240 V
Input frequency
- EW3974 power adapter/inverter Indoor:50/60 Hz
- EW3991 power adapter/inverter Auto:50 Hz
Output power
- EW3974 power adapter/inverter Indoor:90 W
- EW3991 power adapter/inverter Auto:150 W
Output voltage
- EW3974 power adapter/inverter Indoor:9.5 V
- EW3991 power adapter/inverter Auto:230 V

Side by side

Differences highlightedShow differences only

Comparison of EW3974, EW3991
27 specifications	A Ewent EW3974 power adapter/inverter Indoor Model EW3974 View product	B Ewent EW3991 power adapter/inverter Auto Model EW3991 View product
Features8 differ
PurposeDiffers	Laptop	Universal
Power supply typeDiffers	Indoor	Auto
Power current typeDiffers	AC-to-DC	DC-to-AC
Input voltageDiffers	100-240 V	220 - 240 V
Input frequencyDiffers	50/60 Hz	50 Hz
Output powerDiffers	90 W	150 W
Output voltageDiffers	9.5 V	230 V
EfficiencyKnown for one	86%	Unknown — not stated by the source
Supplementary power connectorsKnown for one	8	Unknown — not stated by the source
Detachable power connectorsKnown for one	Yes	Unknown — not stated by the source
Power protection featuresDiffers	Over current, Over voltage, Overheating, Short circuit	Over voltage, Overload
Input currentKnown for one	Unknown — not stated by the source	12 A
Power plug typeKnown for one	Unknown — not stated by the source	Type F (CEE 7/4)
Performanceidentical
USB connectivityKnown for one	Unknown — not stated by the source	Yes
USB output voltageKnown for one	Unknown — not stated by the source	5 V
Designidentical
On/off switchKnown for one	Unknown — not stated by the source	Yes
Certificatesidentical
CertificationKnown for one	CE, RoHS, FCC	Unknown — not stated by the source
Weight & dimensionsidentical
WidthKnown for one	130 mm	Unknown — not stated by the source
DepthKnown for one	57 mm	Unknown — not stated by the source
HeightKnown for one	30 mm	Unknown — not stated by the source
WeightKnown for one	320 g	Unknown — not stated by the source
Poweridentical
Output currentKnown for one	Unknown — not stated by the source	500 mA
Technical detailsidentical
Peak powerKnown for one	Unknown — not stated by the source	300 W
WaveformKnown for one	Unknown — not stated by the source	Sine

A dash means the value is not stated by the source. Unknown values are never counted for or against a product, and there is no overall score.

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