Works perfectly. Installed on in my trailer and one in a portable HF transmitter box.
You have a load output, battery input, and power input. It automatically selects the power input to the load if it is available and supplied charge current to the battery connector. When the power input fails, it immediately switches to the battery input. In my installation, the battery is on an AC charger so the charge current is not needed. The equipment does not appear to "see" the switch happen.
I have a DC power supply connected to the main input of this unit. If the AC goes off, the unit switches to battery backup, when power is restored, the unit switches back to the input. The wiring was greatly simplified vs. using a switch and there is no interruption of service.
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So far so good
So far so good! A little about my setup. The power source is an MFJ 30AMP power supply with variable voltage. The battery is a 12V Bioenno battery, 40AH. I've been testing this for a few days and it does charge the battery no problem. Of note, I had to turn up the voltage on my PS up to 14.8 to get it to charge the battery properly. After that adjustment, no issues. It fully charged the battery and the charger stopped. I did a test while my two ham radios (FT710 & 2730A) were on. I turned off the PS and the battery kicked in to power the radios with zero problems. So it seems so far this does what it's supposed to do. At this point, I would recommend this. If anything changes, I will update my review.
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Calificado en Estados Unidos el 16 de julio de 2023
Calificado en Estados Unidos el 18 de noviembre de 2021
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Calificado en Estados Unidos el 14 de noviembre de 2022
Calificado en Estados Unidos el 24 de mayo de 2023
So far so good! A little about my setup. The power source is an MFJ 30AMP power supply with variable voltage. The battery is a 12V Bioenno battery, 40AH. I've been testing this for a few days and it does charge the battery no problem. Of note, I had to turn up the voltage on my PS up to 14.8 to get it to charge the battery properly. After that adjustment, no issues. It fully charged the battery and the charger stopped. I did a test while my two ham radios (FT710 & 2730A) were on. I turned off the PS and the battery kicked in to power the radios with zero problems. So it seems so far this does what it's supposed to do. At this point, I would recommend this. If anything changes, I will update my review.
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Calificado en Estados Unidos el 23 de octubre de 2021
Calificado en Estados Unidos el 10 de abril de 2020
Calificado en Estados Unidos el 6 de agosto de 2022
This works fine as long as there is a significant voltage difference between the battery and power supply. If you're using the built in float charger, your battery will be a diode drop (about a half volt) below the power supply, so you can ignore the rest of this.
I'm using a stand alone charger on my battery and its voltage was 13.7V. My power supply was at 13.8V. Whenever I put even a 5A load on the output, the voltage would drop below 13V. Disconnect either battery or power supply, and the output voltage would drop less than 0.1V under load.
I cracked it open to see what was going on. It's a pretty basic MOSFET switch. 3 parallel MOSFETS each side driven by a 6 pin controller. There's also a simple resistive charging circuit with a comparator driving the charge LED. Measuring the gate drive, it was obvious the controller was cutting drive back whenever the input voltages were close. I cut the sense line between the battery and controller and added a resistive voltage divider: 150 ohms from the battery to the sense pin and 3.3k from the sense pin to ground. Problem solved. Now it prioritizes the power supply over the battery with minimal voltage drop.
I'm using a stand alone charger on my battery and its voltage was 13.7V. My power supply was at 13.8V. Whenever I put even a 5A load on the output, the voltage would drop below 13V. Disconnect either battery or power supply, and the output voltage would drop less than 0.1V under load.
I cracked it open to see what was going on. It's a pretty basic MOSFET switch. 3 parallel MOSFETS each side driven by a 6 pin controller. There's also a simple resistive charging circuit with a comparator driving the charge LED. Measuring the gate drive, it was obvious the controller was cutting drive back whenever the input voltages were close. I cut the sense line between the battery and controller and added a resistive voltage divider: 150 ohms from the battery to the sense pin and 3.3k from the sense pin to ground. Problem solved. Now it prioritizes the power supply over the battery with minimal voltage drop.
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