possible battery backup?

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salty joe

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I just read the very well written plan by chipmunkkofdoo m2 for a battery backup and it inspired this idea.
Since I have a DC pump that runs well on 12V as well as 20V, could I skip the inverter and not switch from DC to AC then back to DC using diodes? So during a power outage, the battery would be directly connected to the DC pump.
 

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salty joe

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I probably got the wiring wrong in the attachment but my question is, Is it possible to use diode in a similar fashion?
 

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