Puzzler for you electrical gurus....
A year ago I bought a 12v LED light strip (18" long) and mounted in the van I use an another RV. I like it so much I bought a couple more of them to use to mount in my Bigfoot pictured below. These ...
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It is possible that it considers 13.4V to be over voltage. Most LED fixtures have a driver of some kind in them to regulate the voltage closely, and may shut down if out of range. If it is a house fixture it might be expecting 12V in a narrow range, while an RV fixture should expect anything from about 10 to 14.7V. To test this, you might try putting a diode in series with the fixture, which will drop the voltage by around 0.7V. If that works, it could be a good solution to keep the LED running while on the inverter. Just make sure the diode has a current rating greater than the draw of the fixture. You may end up with a problem on the low voltage end as the batteries discharge though.
