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post #12 of Old 05-05-2013
Maine Sail
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Re: Battery Charging

Originally Posted by ebs001 View Post
btrayfors, I started this thread with rather a fixed mindset and having read through a couple of your postings xorts and further investigation of Northern Arizona Wind and Solar I am beginning to see that there maybe other possible solutions.

It occurred to me that on a good sunny day at anchor I could equalize with the solar panels by first taking the batteries up to float stage then solar equalize.

I spent a couple of days in St. Augustine and the wind blew like stink. We had excellent charging from the D400 and I am reconsidering giving it up.
This is good the D400 is a beautiful piece of gear. Keep it! Or, on second thought, give it to me...

Originally Posted by ebs001 View Post
The one problem I have with chargers is that they seem to go into the Acceptance stage too early and it takes hours to get to 80% let alone 100%.With some chargers the charging curve is programmable and that's another area to consider.

Thanks to all who replied.
I suspect your battery monitor has become out of calibration? A battery charger only "goes into absorption" when the absorption voltage has been attained at the current available.

If you are hitting absorption this means the batteries have finally come up to absorption voltage. If they are sulfated this can happen well before it should but its not really the chargers fault.

The biggest problem with many chargers is the absorption stage is rather dumb, or not as "smart" as they market it, and goes into float prematurely for many banks. Often times they are simply timed from when absorption voltage is attained and after a set period the charger drops the voltage to float level whether the bank is at 98% +/- SOC or not...

Getting back to 100% SOC will take about 10+ hours as the batteries are accepting less and less the fuller they become. The last 5-10% takes hours... The only way to speed up absorption charging is to boost the absorption voltage.

-Maine Sail / CS-36T

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