openinverter forum

Hi There,

I just found a good battery module for my application, but before pulling the trigger and buy the modules would like to check what is the maximum nominal voltage that the SDU can work.

Here is the scenario 1: (8S) 4.6 kWh modules @ 48 V = 384 VDC, 36.8 kWh. Just thinking to increase the capacity a little more and have things even...
Scenario 2: Same battery modules but arranged in a 10S. that will put my nominal voltage at 460.

What you guys think

Hi,
The DC link capacitor is rated at 430V on the SDU i was runing a 102S pack limited to 429V and it blew up.
I also know of a system runing 440V on an SDU without problems, so i guess parameters play a big role.

The voltage could go higher when in regen.

Hmm, my MG ZS EV pack has a max voltage of 453v (108s). Best be careful.

What are the parameters that allow an SDU to survive higher voltage?

Nothing, above 400V you run the risk of breaking caps quickly.

You need to make sure your udcmax is set correctly.

tom91 wrote: ↑Sun Jul 28, 2024 11:19 am You need to make sure your udcmax is set correctly.

It's currently set to 0 for testing purposes. I need to look through the Parameters glossary to understand what all these settings are for.