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Re: SAR v3 Charge profile

PostPosted: Thu Feb 24, 2011 5:05 am
by boatguy
Coulomb wrote:As I said, it's not the high voltage that is the killer, it's the time spent at the higher voltage that kills them. You want to spend more time there.

It takes about 5 minutes to get a charge profile after the regulator reaches absorption or there abouts. Activate the ABS input, wait a few seconds and record the battery voltage. Remove the ABS input and let the battery voltage step down to float over a few minutes.

Why is it you'll put up with a dumb charger that will most certainly cook your batteries if you don't turn of some loads, but you don't want to deal with a regulator that purposely avoids overcharge by occasionally putting it in ABS?

The book you need to read is "Living on 12 Volts with Ample Power".


What do you mean when you write "You want to spend more time there"?

I've spent the last two weeks trying "deal with a regulator t hat purposely avoids overcharge...". I had a V3 sent via FedEx. I'm on a boat, not on a test bench. You know the voltage targets for Bulk and Absorption, and you know the Absorption time. Why not tell us? Why make me waste my time and run my engine a bunch of hours to figure it out. I've got a long list of things to do before crossing the Pacific, reverse engineering your charge profiles is not a good use of my time.

My offer still stands: If you agree to read "Customer for Life", which I will purchase for you, I will purchase and read "Living on 12 Volts with Ample Power". Ruth has my shipping and Billing information - I"m the guy who returned the 2nd unit, which I would have kept if I could get any cooperation on the settings.

Which profile is closest to the specs I sent to Ruth over a month ago, all voltages at 25C:
Bulk target: 28.8
Absorption: 28.4
Temp adjustment: .06v / 1C
Need to restore about 500ahrs on each charge cycle
Ambient temperature is 29C
Batt temp after 2hrs of charging is about 38C

Re: SAR v3 Charge profile

PostPosted: Thu Feb 24, 2011 12:01 pm
by Coulomb
I can see that you're not going to learn anything from what I post, so this is the last post.

When batteries accept current, absorption time is shorter, not more as you seem to want.

The so-called target you mention is a Balmar gimmick they added to cover up the fact that their regulator has poor resolution and starts to cut back on Amps much sooner than the actual absorption setpoint.

The best set point is the Ample Power gel. Read the book, get smart, and you'll be a customer for life because we build gear technically correct not to schmooze people into a thinking they deserve a gold star.

Re: SAR v3 Charge profile

PostPosted: Thu Feb 24, 2011 12:25 pm
by boatguy
The "target" comes out of the Mastervolt spec sheet for the batteries. Got a Balmar chip on your shoulder?

You won't have any "customers for life" because you'll be out of business.

If technically superior products carried the day we'd all have been using Sony Beta VCRs, but marketing carries the day so we all ended up using VHS. Recognize yourself?