Hardware selection for charge control of 4 batteries

[nonish]

 I have a charger and 4 batteries. I want the charger to connect to each battery in order and charge each in turn.

When the charger connects to a certain battery, I want to receive the voltage values of the battery, and according to these values, using some kind of controller, give a command to the charger whether to charge the current battery or switch to the next battery.

I want the process to be carried out continuously and automatically, so that it will stand up in the field and I will not have to intervene in the system operation.

I will write a LV app for this operation.

What NI hardware is suitable for this task?

What hardware is suitable to implement the transition between the batteries, and what controller is suitable for communication and control of the system?

Will using a cDAQ with a MUX module (for passing between the batteries) and a daq module (for reading the voltage from the batteries) be appropriate?

Can cDAQ be a stand alone system by itself without the use of an external computer?

If not, what controller does NI have that will fit this task and how do I implement the whole system with it?

[santo_13]

Why does it have to be only one charger and 4 batteries?

why not a charger for each battery? 

What application do these 4 batteries power?

[nonish]

I have 1 charger and 4 batteries. This is what I have and that's it. I should check the voltage value of each battery in order, and if necessary, then charge it.

What NI products can I use in order to implement this task?

[santo_13]

When you say, "That is what I have, and that's it.", you still need to spend money to buy the NI products, and I am suggesting comparing the cost and effort of developing this solution vs. buying 3 more chargers.

What kind of batteries are those? multi-cell with cell-balancing?

In short, you need a DAQ with at least 4 differential analog inputs to measure the voltage (provided the voltage of the battery is well within the module supported or you need a divider circuit) and a bunch of relay controls using digital lines. The relays must be external and depend on the voltage and current it needs to switch.

[JohnatanBravo]

https://www.wireflow.com/products/io-modules/c-series/wf-3168-battery-stack-monitor-and-balancing-mo...

How about something like that (see link above), it fits into your cDAQ.

Also, no, your cDAQ will need to be connected to PC via USB to run, a cRIO system could run standalone.