At 0.1V the panel cannot actually run.
If you’re seeing “0.1” on the display, one of these maybe happening:
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It’s not really at 0.1V it’s a reading error/phantom voltage.
With a bad ground or a floating power feed, electronics can “ghost power” through other circuits and show tiny nonsense voltages. -
The panel is intermittently getting real power, but it collapses when you press BATT.
Example: corroded connection, weak splice, loose pin, bad fuse holder. With no load it shows something, under load it drops to near zero. -
You’re not reading the coach battery at all - you’re reading the panel’s supply line.
The BATT display is the voltage the panel sees at its own power input, not a guaranteed accurate “battery at the battery posts” reading.
What to do next :
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Measure battery voltage at the battery posts with a meter.
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If it’s ~12V+ and the panel says 0.1 → panel power/ground issue (or bad panel).
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If it’s actually near 0V → your house battery disconnect is off, battery is dead, main fuse/breaker is open, or there’s a cable issue.
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Then measure behind the panel:
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Panel +12V to ground should be basically the same as battery voltage.
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If you have 12V at the battery but ~0V at the panel → wiring/fuse/disconnect between them.
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If you have ~12V at the panel feed but it still shows 0.1 → panel likely failed.
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Bottom line: 0.1V is not a “low battery” reading. It’s “the panel isn’t being properly powered,” or the supply collapses due to a bad connection.
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