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Old 05-29-2016, 10:28 AM   #1
Real Nice Clark
 
Join Date: Apr 2016
Location: Littleton, CO
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Solar panels over-charging?

First trip out with my Zamp solar panel. My TT has the pre-wired Zamp connection. It seems to work great and charges my 2 12V (group 24) batteries fairly quickly. Question though: checked the controller yesterday it was showing 14.7 volts from the battery bank and was still showing to be in absorption/equalization charging mode. I thought it should go into float charging after reaching 13.6V? I unplugged it at that point. Now, reading the specifications for the solar controller, it shows "absorption charging voltage at 25*C-14.7". But it also reads "float charging at 25*C- 13.6". Am I correct in thinking it should have gone into float charging after reaching 13.6V? Could it have damaged the batteries getting up to 14.7?
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Old 05-29-2016, 10:45 AM   #2
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Originally Posted by mountainjunkie View Post
First trip out with my Zamp solar panel. My TT has the pre-wired Zamp connection. It seems to work great and charges my 2 12V (group 24) batteries fairly quickly. Question though: checked the controller yesterday it was showing 14.7 volts from the battery bank and was still showing to be in absorption/equalization charging mode. I thought it should go into float charging after reaching 13.6V? I unplugged it at that point. Now, reading the specifications for the solar controller, it shows "absorption charging voltage at 25*C-14.7". But it also reads "float charging at 25*C- 13.6". Am I correct in thinking it should have gone into float charging after reaching 13.6V? Could it have damaged the batteries getting up to 14.7?
Not sure what the 25*C means (do you have temperature probe) but the charger should remain in absorb (14.7 is good, but I like 14.8 better) for about 1-1/2 hours after reaching 100%; then drop to float. Keep in mind it is reading battery voltage while under charge so it will be high. If you get a chance, let the batteries rest (no load and no charge for several hours and read them.. should be truly full at 12.7 vdc, but more importantly the specific gravity should read 1.265. So, it is normal and good to remain in absorb beyond "full", time wise. You will not boil the batteries, as some claim. Do, however, check water on a routine basis.
WW
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Old 05-29-2016, 10:48 AM   #3
Real Nice Clark
 
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thanks!
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Old 06-02-2016, 08:55 PM   #4
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25*C I'll guess is 25 degrees Celcius (77*F)... Most controllers will give a temperature and a voltage rating for a reference.. As WW mentioned your batteries won't boil, unless you've had it on the absorption level for a couple of days or more, which would indicate a failed controller..
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Old 06-02-2016, 11:51 PM   #5
Real Nice Clark
 
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Originally Posted by glen1971 View Post
25*C I'll guess is 25 degrees Celcius (77*F)... Most controllers will give a temperature and a voltage rating for a reference.. As WW mentioned your batteries won't boil, unless you've had it on the absorption level for a couple of days or more, which would indicate a failed controller..

Now that I realized it was normal to get that high for a short period everything seemed to be in order.
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