Five steps to quickly judge whether the mains charger (AC adapter) can match the portable outdoor power supply, and then check it in sequence.
Look at the nameplate (INPUT parameter) of the portable power supply body first, and then compare it with the nameplate (OUTPUT parameter) of the charger.
First, 1. The voltage must be strictly consistent (most importantly, it is wrong to burn the machine)
DC round charger (most commonly used)
Power supply input DC: mostly 12V/24V → charger output voltage must be exactly the same, with an error of ≤ 5%.
Example: the power standard DC 24V input can only be used with the output 24V charger; 12V and 19V must not be used.
Type‑C PD fast charging port
The power supply supports PD input: the charger needs to support PD fast charging protocol, and the voltage range includes the voltage required by the power supply (5V/9V/12V/15V/20V). Only ordinary 5V chargers can only charge slowly or not.
High pressure charging and low pressure = burning BMS protection plate; Low-voltage charging and high-voltage charging = unable to charge, and the charger is hot.
2. Power/current: Charger ≥ rated input power of power supply.
Formula: power W = voltage V× current a.
The maximum power input is 120W → the rated output of the charger is ≥120W (for example, 120W/150W/200W can be used), and the equipment BMS will automatically limit the current and only eat the power it needs, so the high-power charger will not hurt the machine;
Power of charger < input power of power supply: extremely slow charging, severe fever of adapter, frequent charging loss protection (long-term use is not recommended).
3. Interface physics+polarity matching (round mouth must be checked)
① Interface size
DC round mouth is common: 5.5×2.1mm, 5.5×2.5mm, and the plug can be inserted smoothly, not loose, and not forcibly plugged; The size difference is not good at all.
② polarity of positive and negative poles (fatal round mouth)
The vast majority of national standards: inner needle+positive electrode, outer ring negative electrode (symbol: ⊕ in the outer ring,+in the center);
The polarity of charger and power supply identification must be the same; The polarity reverse connection directly burns out the portable power supply charging module. If there is no sign, you can use a multimeter to measure the voltage to confirm the positive and negative poles.
Type‑C polarity problem, only look at the protocol.
Iv. 4. Matching of charging protocol (special for fast charging of port C)
Portable power supply with PD input and 65W/100W fast charge: the charger must be PD3.0/PPS fast charge; Ordinary 5V2A white card head can only charge slowly at 5V, which can't reach the nominal fast charging power.
DC round hole power supply does not need to look at fast charging protocol, only at voltage and power.
V. 5. Verification of actual electrification (last step)
1. Plug in the mains socket first → then connect the portable power supply;
2. Normal: the power supply lights up the charging indicator light, the power is displayed near the rated input, and the adapter is slightly warm;
3. Abnormal: power off immediately: the charger is hot for a few seconds, the power supply is wrong and flashes red, and there is no power supply at all = it is not matched and disabled.
Simplified shorthand formula
The voltage is exactly the same, the power is only large or small, the socket is fit, the polarity is aligned positively and negatively, and the C port is checked for fast charging.
