Charging - Bulk, Absorption and Float

Hi All

Can someone help validate / correct my understanding on the above.

I am trying to understand in simple terms what is happening in these states of charge. I have read Energy Unlimited - and other documents - I think I've got my head around it - but fear I haven't understood it correctly. Be gentle with me if I am being stupid :-).

Bulk -

The charger throws amps in to the battery - as many as it can (while being limited by any specific limits set in the charger). As loads of amps pile in to the battery - the battery voltage rises. When the battery voltage reaches the specified absorption V - bulk stops - and absorption starts. This phase will simply go on as long as it takes - to get to the battery V to the set absorption V. This could take 1 minute, 1 hours, 3 hours....

Absorption -

The charger continues to throw amps at the battery - but in this phase it doesn't allow the voltage to go above the specified absorption V. So, as time goes on, in this phase, the number of Amps drop off, as the battery gets fuller, the charger requires less amps to maintain the battery at the specified V. Eventually the number of Amps being thrown at the battery drops to almost nothing - to hold the battery at the specified absorption V. At this stage, or, when hitting the time limit set for absorption, the charge stops absorption and switches to float. This phase will go on for as long as it takes, or, for a specified time if time limited in settings of any given charger.

Float -

The charger now just holds the battery at a lower specified voltage - trickling the lowest number of Amps in to the battery that it can- to maintain the float Voltage.

Feedback please - am I way off the mark ?

Thanks

Tim

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VRM Portal performance issues 2023-05-22


UPDATE: for latest status, see 5th update below.


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And as a temporary measure we have disabled the state graphs on the Advanced page, since they cause for an extraordinary high load, compared to all the other graphs.

We're working hard on this; and I expect it to be solved in the coming hours.

My apologies for the inconvenience.

Matthijs Vader

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[moderator's note: edited to show "VE.Smart Networking" rather than "VE.Bus Networking"]

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//TAB

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Many thanks

vanlifer007 asked
nicetrip commented ·

3 Answers

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Guy Stewart (Victron Community Manager) asked
kevgermany answered ·

12 Answers

Official Depth Of Discharge Recommendations For LiFePO4

Having recently had a 4 x 100 Ah LiFePO4 system installed, I am finding hard to shake off the habits learned from a crappy lead acid system & allowing the state of charge to dip to 50% goes against the instincts learned from past experiences.

What am I safe to use out of these batteries?

Lots of hearsay, not too many hard facts.

Dave asked
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Can I use 24 volt solar panels to charge 12 volt batteries through MPPT Controller

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thanks

stevecounsell asked
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2 Answers

Keine Einspeisung in Netz erlaubt.

Hallo,

wie kann ich die Einspeisung verhindern am AC In bei einem MultiPlus2 bei

ESS.

Da in Deutschland keine Einspeisung auch die 0 Watt Einspeisung ohne Genehmigung

des Netzbetreibers nicht erlaubt ist.

Hub4 funktioniert auch nicht ohne Einspeisung und HUB1 ist wegen der

Spannungssteuerung keine Alternative.


Meine Anlage ist DC verbunden.

- 2 Mppt Laderegler

- 1 MulitPlus-II 48/3000/35-32

- 3 Pylontech US2000

- Venus GX

- ET340


Wozu gibt es im Multiplus bei Grid Code - Settings die Einstellung

-> Use Aux1 as disable FeedIn signal.


Freue mich auf eine Antwort.

knut asked
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7 Answers

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Herve RV Nizard asked
mal-l edited ·

2 Answers

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