I have a 100 watt solar panel that is only connected to 6 led landscape lights. They are all 5 watts. That’s the only load. I have 1 lead battery (lawn mower) that’s being charged by the panel. Every night the lights come on great, but after a couple of hours they will only stay on for a second then go off for 3 or 4 seconds, then back on for a second. I’ve tried three solar controllers and the results are the same. I’ve read where the voltage may be traveling back to the solar panel and if it is, I don’t know what to do.