Hi,

in general, the SOC is defined as the percentage of the maximum usable charge of a battery, regardless which type. Hence, the limits in this definition are always 0-100%.

Normally, SOC = 0% at the cut-off-voltage and SOC = 100% at the maximum voltage.

Best regards,

Martin

If you are not talking about the actual SOC constraints in chemical perspective, I think you are looking for a recommended SOC range for your battery system.

Even for the same technology, different manufacturers have different recommended ranges, which are normally defined by considering the life-cycle performance such as degradation and lifetime.

So you should be able to find this SOC range in the manufacturer's technical sheet.

Good luck.

If you are talking about the SOC practical (Hardware), Most of the battery bank has the SOC range 20-100%. I mean as the SOC reach at 15-20 % then battery behave like fully discharge.