VIctron multiplus2 24/3000/70 - configure - charger

DIY
,
1

I’m about to wire our DIY campervan. I know the Victron must be configured though most example i’ve seen with the Victron are with 12V lifepo4 systems

This is from the battery manuals (230AH 12V):

Charging:
recommended charge current: 46A
max continuous charge current: 200A

recommneded charging 12V 14.6V (Lifepo4)
charge/boost voltage: 14.4 ± 0.2v
absorption voltage: 14.4+= 0.2v
Over Voltage Disconnect : 15v
Over Voltage Reconnect: 14.2V
Tail Current: 4.6A (0.02c)

Discharging:
Under Voltage Warn: 11.6V
under voltage Recover: 12V
low voltage disconnect: 10.8V
Low voltage Reconnect: 12.4V

I beleive i need to fill in the following values in the victron settings. I assume as i’m creating a 24V system i should simply multiply the values by 2 to get the proper values to fill in ?

dc input low-shutdown:
dic input low restart:
dc input low pre-alarm:

Charge current (anything up to 200A?): 120A?
I guess it make more sense to use something like 120A ?
Our cables are 2/0(221 Fareneight insulation) (on 24V) good safe for 200A.

But since we have an Shore Input braker of 15A that would mean max input of 60A ?

Charge Current: (below maximum charging rate)

Absorption Voltage:
Float Voltage:

Repeated Absorption Interval:

Maximum Absorption Time:

Repeated Absorption Time:
Temperature Compensation:

Charge Curve:

Found a thread of a lifepo4 settings from the manufacturer… but that is still 12v. So we should simply multiply it by 2 ?
(this was maybe not the same exact battery, it was a 100AH instead of the 230AH)

-High Voltage Disconnect: 15V
-Charge Limit Voltage: 14.6V
-Equalize Charge Voltage: 14V
-Boost Charge Voltage: 14.4V
-Float Charge Voltage: 13.8V
-Boost Charge Return Voltage:13.33V
-Over Discharge Return Voltage:11.8V
-Low Voltage Alarm:11.2V
-Over Discharge Voltage: 10.4V
-Discharge Limit Voltage: 10.4V
-Over Discharge Delay Time (seconds): 10ｓ
-Equalize Charge Time (minutes)：120mins
-Boost Charge Time (Minutes)：270mins
-Equalize Charge Interval：180mins
-Temperature Compensation: 0

Any input would be appreciated :slight_smile: thank you.

2

From the battery manual, they are charging at 0.2C, so 0.2 x 230 = 46A. That has nothing to do with the voltage, just the size of the battery so if it’s 230AH at 24V, the charge current will still be 0.2 x 230 = 46A. If that’s what you want to use. The max charge current is nearly 1C at 200A.

You dont need to go to 14.6V for a 12V battery. 14.2V seems fine for most, and stops the BMS from disconnecting if the battery is well balanced. You can set the max charge to 28.4V and float to 13.6V x 2 =27.2V. You also disable Equalize for lithium.

That should get you started. Boost charge time is not relevant it is what it is. The absorption time should be set to 1hr.

I dont know what voltage your shore power is, but 120V at 15A is = 1800W. 25A of charge is around 600w and 1200w will be 50A of charge @ 28.2V. If you do have 120V, you will be fine to run 46A.

3

Thank you.

4

The battery provider returned me an response to the email i sent to them:

Sorry for keeping you waiting. Here are our recommended settings for you:

DC Low Shutdown: 21.6V
DC Input Low Restart:24V

DC Input Low Pre-Alarm:23.2V

Charge Current: (below maximum charging rate)

Absorption Voltage:29.2V
Float Voltage:27V

Repeated Absorption Interval:7.00d

Maximum Absorption Time:2h

Repeated Absorption Time:1.00h
Temperature Compensation:0

Charge Curve:fixed