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I am running some 10 watt LED floodlights off a 12 volt battery and 230 volt inverter. The 10 watt LED floodlights are flashing on and off. I am also running 20 watt floodlights and they do not flash. Both work perfectly on the mains power.

How can I eliminate the flashing with the 10W lights?

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What are the specs of the inverter? Does it output a stable 50/60hz true sine wave? Most likely it doesn't put out a true sine wave and some electronics can't handle that. – Grant Dec 1 '13 at 21:07
You are converting from low-voltage DC to high-voltage AC and then back to low-voltage DC. It might be worth considering converting your LED floodlights to work directly from an external low-voltage DC supply without two intermediate conversions. – RedGrittyBrick Dec 2 '13 at 16:06

Buy a better inverter. The DC/AC circuits in your 10W lights evidently like a pure sine wave (as provided by grid/mains power) on the AC input side, and your inverter is almost certainly not a pure sine wave inverter (just based on your symptoms, but feel free to confirm/deny).

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+1 and also: I would guess that they might be dimmable LED floodlights, and their circuitry that looks for the duty cycling from the dimmer is being confused by the waveform from the inverter. – Kaz Dec 2 '13 at 16:50

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