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simulate this circuit – Schematic created using CircuitLab If you always want to use the line-powered switching power supply in preference to the solar-charged battery, then arrange that power supply to put out a little higher voltage than the battery. It doesn't need to be much, even just a few 100 mV would do it.
The final power output of this automatic switching circuits will be used to power 12v devices (30 Ampere maximum). It is important that the circuit provides uninterruptible power during switching and that it works in 11-14v range. P.S.: please provide a detailed list of the scheme and electrical components to be used. @Arsenal Why not?
One switch simultaneously switches two battery banks while isolating the battery banks from each other. Battery isolation protects the Start battery from being discharged by the many House loads such as refrigerators, stereos, and lights, while preserving it for starting the engine.
In the event that more starting power is required, the two battery banks can be combined. The operator simply turns the switch knob to the COMBINE BATTERIES position. Current flows from both House and Start batteries to both House and Start loads. Advantages over selector switches.
Another possibility is to connect the battery directly, and the power supply thru a Schottky diode. Arrange the power supply voltage to be the battery float charge voltage after the diode. You can think of the battery as always providing the power, and the power supply charging the battery when on.
The easiest thing, if it is allowable, would be to put a diode in series with each battery. Then you could just swap out either battery any time. But you lose some voltage at the diode. If you use a mechanical switch, there will always be some voltage sag right at the moment you change over, because it is break before make switching.
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