15 replies to this topic

[Wallowa]

You sure you want to know?   More info than I care to read right now... 

BU-403: Charging Lead Acid - Battery University

 

 

This was at that LA battery site: 

 

https://batteryunive...ing-lithium-ion

 

 

Details of what we have been discussing...thanks.

 

Phil

[Jon R]

Hi Phil,

I didn’t mean to discourage you from asking questions by referring you to the manual. I just had looked at it to make sure I provided correct information and saw some good explanations of some of the things you had asked about that I thought might help. I’m happy to continue trying to help.

Jon

[Jon R]

In bulk charging the charger is supplying whatever voltage is necessary (up to the voltage limit you set for bulk charging) to deliver the rated current of the charger.

When the battery voltage rises to the absorption limit you set, the charger switches to constant voltage charging at the set voltage (“absorption”). The current will tail off as the battery’s charge state increases and the equivalent resistance rises. How long it stays in absorption can be based on how long it was in bulk charging (“adaptive absorption”), or a hard time limit, or a current level (expressed in percent of battery capacity on these chargers).

It then switches to float, which is also constant voltage charging, but potentially at a lower voltage than absorption depending on your setting. The current will be whatever the battery draws at that charger voltage.

The charger will reset and start bulk charging again when the battery voltage drops below a set level.

Edited by Jon R, 10 October 2021 - 06:09 PM.

[Wallowa]

Ron,

 

No worries,  I did not take your post as a wave-off.....Ask Vic, I am like the "Energizer Bunny" and I just keep going...

 

My Orion DC/DC does not have a bulk voltage setting...only Absorp and Float...BB says not to use the "adaptive" so I setting the charge times....

 

New Twist:

 

Just checked my 712, DC/DC, MPPT and BB....first thing I noticed was a 'green' steady light on Orion [means float charge is on], never saw that before....means it is on...and 'blue' was flashing to indicate Bluetooth... showing "Float" on DC/DC .....Victron Connect 712/BB showed a higher voltage in BB than yesterday by quite a bit...13.35 yesterday vs 13.88V Today...what?  Tundra battery on Battery Tender and AGM battery showed 13.3V...disconnected fuse to DC/DC and green light out....noticed that I did not have the DC/DC disconnect set to "Smart Alternator" but to "User'; switched to "Smart" and Shutdown default settings appeared [14V 'start' and 'delayed' 13.3V @ 120sec with 'shutdown' 13.1v] and green light went out...with fuse closed and tender on.

 

Yesterday I had the Hawk out draining the water and ran the DC/DC..Solar to about 14.4V...on a long time...when I turned off the Tundra Ignition, the DC/DC recognized that and stopped any current to BB.

 

I will fiddle with this and see where it is going....in 15Mins today after shutting off the 'green' light BB from 13.88 to 13.83.  Now 1 hour + and BB @ 13.73V.

 

Will let you folks know as the saga continues....

 

Phil

 

Ps...The DC/DC was set to "Charge" and not "Power" setting...

Edited by Wallowa, 10 October 2021 - 08:24 PM.

[Jon R]

Sorry, i wasn’t thinking it through when I wrote that. In bulk charging the voltage is limited to the absorption voltage setting. When the voltage in bulk charging rises to that set voltage it switches to absorption mode.

[Wallowa]

Sorry, i wasn’t thinking it through when I wrote that. In bulk charging the voltage is limited to the absorption voltage setting. When the voltage in bulk charging rises to that set voltage it switches to absorption mode.

 

 

Got that...so the voltage at the start is usually very close to absorp voltage setting, hence bulk full bore amperage output will be relatively brief...will pay closer attention to that cycle next time I start the Tundra...thanks.

 

All good...can say for certain my BB is at 100% whether I like it or not! Seems to have balanced and topped off.

Edited by Wallowa, 10 October 2021 - 10:12 PM.