Forum Discussion

Big_Love's avatar
Big_Love
Explorer
Jul 11, 2020

Solar controller float charge at 13.6

I have an small trailer with 200w of solar panels and two 6v deep cycle lead-acid golf cart batteries. The controller I have is Renogy Wanderer 30A, described as capable of separate bulk, absorption and float charges and apparently is programmed to float at a fixed charge at 13.6v after the batteries are fully charged.

The float is not adjustable on this controller. I note that when in float, the amperage going to the batteries at 13.6v is very low, typically less than 1 amp.

My other trailer has a converter which charges at 13.2v float, which I believe is a sign of a good multistage charging system that does not overcharge the batteries.

Is this solar controller overcharging my batteries in float? Or is the low amperage at 13.6v a safe float?
  • For all standard Lead Acid batteries, the nominal float voltage is 13.5 give or take a few tenths. The original poster has no problems.....its a non issue.
  • Have you ever performed an equalization charge on your 6v battery bank, may help?
  • Look up the manufacturer's recommended float voltage range for your batteries. Compare that to what you controller is doing. Anything else is nothing but guessing.
  • 13.6 is fine when you consider it is off (zero volts) 12+ hours a day.
  • from what I have read anywhere between 13.2 to 13.8 is acceptable for a float, mine is 13.6 also on both my solar and my plugin.

    Steve