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Thanks for the speedy response. The Controller is a Renogy Wanderer 10a PWM and has the lithium battery option. The panel is a Renogy 100w 12v flexible unit. I will go back to the Renogy site - as you say, there are lots of troubleshooting options on it, but none so far that talk to the absence...

My battery is an Ecoworthy 12v 100ah LiFePo4

Moved over from Lead Acid deep cycle to the Lithium battery on my boat. Ensured the Li option on the Renogy Wanderer 10a controller was selected. Noted fluctuations in the PV voltage between around 14v to 16 v in full sun. After a few days in very hot weather, the controller stopped “seeing” the...