My Screwy 31

landyacht318 wrote:
Okay from now on, No Diddling around with anything under 16v for an EQ session.

I was a bit surprised to see the SG plateau at 1.280 at 15.7v, and then another 2.5 amps required to bring it up from 15.7v to 16.0v which finally allowed the Sg upto 1.290, and also 'seemed' accelerate the heating process of the battery, especially the cell closest to the center.

I had never noticed such temp differences between the cells before, and I always do several bulb squeezes before looking for bubbles on the float, then a couple more as there is almost always a few renegade bubbles, so there is plenty of time for the thermometer to adjust to the Electrolyte temp.

It had sat at 15.7v for over three hours when I bumped it upto 16v, and I did not expect 33% more current would be required to bring it up just 0.3 more volts. Glad I had it available to do it. Glad I can adjust those voltages. I'm certainly not worried about that extra$$ I spent in '07 for this solar controller or the battery monitor which allows me to control those setpoints.

But the 16v apparently was necessary, and the battery 'performed' well last night, which of course could have just been retained heat from the EQ and from a constant average 4 amp discharge for the next 10 hours, an top of the obvious 100% recharge.

Mex you've been following this thread, what do you think I should set the ABSV at? What about the Float/finish charge?

Right now I've got it set at 14.7 ABSV until amps taper to 0.8 and then 15.2 float/finish, and am not expecting any temps above 75 this week and possibly not more than 65.

The cell getting hot assists in improving the chemical reaction of removing the sulphation from the plates. The higher the temperatures, the more chemically reactive the elements and chemistry become in separating the sulfur from the lead antimony plates. It's necessary.