Dual DC Power Smart Selection Switch - 2 Inputs to 1 Output

In this review the BiXPower Dual DC power smart selection switch is evaluated for users who need a simple, automatic way to choose between two DC sources. The bottom line: this device is for anyone who wants an unobtrusive battery backup or run-time extender that automatically prefers Input A and falls back to Input B when A loses power. The unit's compact size, wide 9V~30V input range, and straightforward barrel connector wiring make it practical for DIY power setups, vehicle electronics, and small off-grid rigs where a brief interruption during switching is acceptable.

Key Features

• Automatic input priority: The switch always selects Input A when it has power, providing a predictable preferred source without manual intervention.
• Automatic fallback: If Input A loses power the output switches to Input B automatically, allowing continuous operation from a secondary source.
• Wide input range: Operating from 9V to 30V means it can be used with many 12V and 24V systems commonly found in vehicles and small solar setups.
• Compact and light: At about 2.98 x 2.98 x 1.3 in and 9.5 oz, it is easy to mount or tuck into confined spaces where larger UPS units will not fit.
• Simple connector layout: Two female 5.5 x 2.5mm input connectors and a male 5.5 x 2.5mm output make connections to batteries and adapters straightforward.
• Water resistant design: The housing helps protect the unit in environments where moisture exposure is possible, increasing reliability in field use.

Who It's For

This switch is ideal for hobbyists and technicians who need a low-cost, low-footprint way to alternate between two DC sources, such as two batteries for extended run time or a main supply with a backup battery. It works well in automotive, marine, and portable electronics projects where an internal battery or tolerant device can handle a brief interruption during switching.

It is not the best choice for sensitive equipment that cannot tolerate any loss of power, such as laptops or tablets without internal batteries, because there is a very short time period with no output when switching between inputs. Users requiring seamless, uninterrupted power should consider a true UPS designed for zero-break transfer.

Pros & Cons

Pros

• Automatic priority and fallback between two inputs simplifies backup configuration.
• Wide 9V~30V range supports many 12V and 24V systems for flexible use.
• Compact size and common barrel connectors make installation and wiring easy.
• Water resistant housing increases durability for field or vehicle use.

Cons

• There is a very short interruption in output during switching, which can reboot or shut down sensitive devices.
• Does not provide regulated or clean UPS-style holdover for equipment requiring seamless power.

Specifications

Our Verdict

The BiXPower Dual DC power smart selection switch is a practical, economical solution for users who need automatic source priority and simple battery backup between two DC inputs. It offers solid value for vehicle and portable power projects thanks to its compact size, wide voltage range, and easy barrel-connector wiring, but is not suitable when absolutely seamless transfer is required.

Frequently Asked Questions

Will this unit work with 12V systems?
Yes, the switch supports a wide input range including 12V and will automatically prefer Input A when it has power.

Will switching cause any interruption to my device?
Yes, there is a very short period with no output during input switching that may reboot or shut down devices without internal batteries.

Can I use two batteries to double run time?
Yes, two batteries can be connected to provide extended run time; the switch will change to the secondary battery when the primary loses power.