Charging question

DIY
,
1

Hello,
I recently installed a lithium batt 4 cells and more than happy with it.

But want to know next : Batt is around 70% full with 13,5 v when i put my 220 charger on it gives 30 amps and goes to 14,50 v. at that moment the charger stops charging and this happens very quickly.
is this the normal way or is it impossible to charge it to full

2nd. is there a way to let my dc-dc activate the charging earlier than 14,2 v for example just above idle then it is generating 13.7

3th and last. I have4 panels of 85 w 20 V on panels wire check 20 V on a sunny day and right under sun no shades the produce 130w max barely enough to run the fridge so batt is not chaching.

Is it time for a new pannel or is this normal

thanks in advance

2

14.5V is over 3.6V per cell. For typical batteries that is already high. At 3.7V most are blocking charge.
There is very little capacity at the higher end of charge and it is not great for battery life.
For the most part, many consider a cell fully charged at, or below, 3.5V.
I think your SOC, or calculation thereof, is not accurate.

3

Thanks Nick. how to check and adjust or is this difficult to say

4

It is already full at 14.5v in fact as nick is saying overfull and you are triggering battery protection here.

You adjust the absorption voltage lower on the charger to be in a safer range.

Or if you mean it is jumping up to that voltage suddenly then it is charging faster than the battery likes and triggering protections from the bms. Maybe lower the amps there a bit as well.

String them so you have higher VOC.

Check your batteries and see what their information actually is (share the information here) and we can help with more specific advice.

5

Tx LX nono it charge normal 30 amps but after 15 0r 20 min it reaches 14,5 v and stops 0 amps then.

so if I understand well is 14,5 is full BMS says 70 % so BMS not correctly configured

and for my panels I put them in serie than

6

Correct. The voltage is (over target) but right for full. The bms is wrong in terms of SOC.

7

so when it go in absorption when 14,5 is reached is is it than ok to chance setting bms and shunt to 100% or is this not the right way

8

What is the charged voltage of the battery meant to be? Obviously i can’t answer that as i don’t know what battery or bms you have.

9

What is the charged voltage of the battery meant to be ( this I do not understand )

well i have 4 cels 314 amps end a daly bms

10

Ok. How have you programmed the daly bms?
That matters.

11

for that i have to come back later have no acces to bms right now

12

hey what about the panels. If I want to buy a 525 w pannel or a 415 and did my calculations well a 100/30 mitt would not be ok is that right. 525W /14,4V = 36,5 amp or am I missing something

13

Check your design in the Victron MPPT calculator.

You can normally over panel by 30%, which means a 550W would be OK. The mppt limits the current to 30A so you loose a bit of peak production but can.use a cheaper panel and still get the full panel performance in winter.