A Super PWRgate is a 12 volt backup power system that can supply up to 40 amps continuously from either a power supply or a battery, and can also charge the battery with its high performance charger.
Connected equipment will instantly switch to batery during a power blackout or power supply failure. No glitches.
The circuit isolates the battery and power supply from each other. Voltage drop is less than 0.3 volts at 20 A.
To keep the batery fully charged and ready for use, the Super PWRgate has a built-in four-stage battery charger with selectable current rates of 1, 4, 7 or 10 amps.
The circuit is optimized for use with GELLED & AGM type batteries, but will keep flooded lead acid and marine type batteries near full charge as well.
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This device does two jobs -
1) as a Battery Charger, with proper 4-stage control, to treat a lead-acid battery as it should be for long life.
2) as an Uninterruptible Power Supply, where the load (radio, whatever) will be powered by the mains power-supply if it's present, and by the battery if the mains fails. There's no changeover time - the power continues without a break.
It does both these jobs together, so you can run the radio and charge the battery all at once, and with seamless switching to battery if the mains fails.
It does all this so well that you can just forget about it and concentrate on what you're doing!
The only drawbacks I can mention are that it's a bit awkward to have to take the lid off to change between AGM and Gel voltage levels, and using fuses to set the max. charge current is a bit strange, and would be easier of they had put the two sockets further apart - but other than that it's ideal for anyone needing reliable 12V power. Recommended!