Lielap
Member
- Joined
- Jun 24, 2014
- Messages
- 60
- Reaction score
- 26
- Country
- Latvia
- Dash Cam
- Prestigio RoadRunner 530, Powerucc Panorama II S
I have tested "Lukas LK-290" and "BlackVue Power Magic Pro" battery discharge prevention devices. While they both are boxes with 5 wires, there are significant circuit design differences which must be taken into account when deploying them.
It turns out that "Lukas LK-290" output voltage is smaller than input voltage. The difference can be as large as 0.9V (observed with input voltage 12.5V). In this picture you see 0.4V difference in output when the input voltage is 13.70V:
As you see "BlackVue Power Magic Pro" does not decrease output voltage.
Use of "Lukas LK-290" might be problematic if your dashcam has problems operating on ~11 volt current (when your battery actually will have ~12 volt current).
Both devices have "off" switch. The idea is that when device is in "off" state, the dashcam will receive power only when ignition is on.
For "BlackVue Power Magic Pro" the current for output is drawn always from B+ wire. ACC wire is never used for supplying current and is used just to detect whether ignition is switched on.
However, "Lukas LK-290" in "off" state will not use B+ wire at all and the current will be drawn from ACC wire. In "on" state "Lukas LK-290" will use both B+ and ACC wires equally (current will be split ~1:1).
Both devices have indicator diode which draw current itself (might not be too important).
"Lukas LK-290" fast blinking diode draws 13.7 mA.
"BlackVue Power Magic Pro" still diode draws 7.6 mA.
I have attached "Lukas LK-290" user manual (which is not available in digital format) which reveals that "time" mode is activated only when the battery voltage decreases to 12.5 volts.
P.S. Nobody responds to e-mails sent to lukas@ address specified in the user manual.
It turns out that "Lukas LK-290" output voltage is smaller than input voltage. The difference can be as large as 0.9V (observed with input voltage 12.5V). In this picture you see 0.4V difference in output when the input voltage is 13.70V:
As you see "BlackVue Power Magic Pro" does not decrease output voltage.
Use of "Lukas LK-290" might be problematic if your dashcam has problems operating on ~11 volt current (when your battery actually will have ~12 volt current).
Both devices have "off" switch. The idea is that when device is in "off" state, the dashcam will receive power only when ignition is on.
For "BlackVue Power Magic Pro" the current for output is drawn always from B+ wire. ACC wire is never used for supplying current and is used just to detect whether ignition is switched on.
However, "Lukas LK-290" in "off" state will not use B+ wire at all and the current will be drawn from ACC wire. In "on" state "Lukas LK-290" will use both B+ and ACC wires equally (current will be split ~1:1).
Both devices have indicator diode which draw current itself (might not be too important).
"Lukas LK-290" fast blinking diode draws 13.7 mA.
"BlackVue Power Magic Pro" still diode draws 7.6 mA.
I have attached "Lukas LK-290" user manual (which is not available in digital format) which reveals that "time" mode is activated only when the battery voltage decreases to 12.5 volts.
P.S. Nobody responds to e-mails sent to lukas@ address specified in the user manual.