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Deep cycle battery Depth of Discharge calculation


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22 minutes ago, Asto said:

Good day people,I have a small question on how to determine the percentage DOD for a 24V system when the voltage is at 20V,21V,22V etc. Anyone with a calcution formula?

Regretfully there is no formula for batteries in use. Voltage change depending on load, so you can not use voltage as an indication of SOC/DOD. The only time you can is if you disconnect the batteries and let them rest for a while. Those values you will need to get fro your battery manufacturer. It varies from brand to brand.. 

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9 minutes ago, Jaco de Jongh said:

Regretfully there is no formula for batteries in use. Voltage change depending on load, so you can not use voltage as an indication of SOC/DOD. The only time you can is if you disconnect the batteries and let them rest for a while. Those values you will need to get fro your battery manufacturer. It varies from brand to brand.. 

The challenge is that the inverter settings are interms of voltage and I would like to set them at 50% DOD

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18 minutes ago, Asto said:

The challenge is that the inverter settings are interms of voltage and I would like to set them at 50% DOD

Jip it would be a challenge, at 200watt the barriers will read for example 54 volt (100%), then you start a 1800wh kettle and it will drop to 52 volt, your calculation will now say that the batteries are at 80% or the likes. Now the kettle switches off and the volts go back to 54 volts or 100%. so in a space of 5 minutes the SOC went from 100 to 80 and back to 100%. and this will happen for every load that switches on and off... 

As you can see, this will never ever be an accurate way of doing it. 

The best option is to install a battery monitor, it will measure the coulombs in and out of the battery and give you a much more accurate reading of what the SOC/DOD really is. 

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5 minutes ago, Jaco de Jongh said:

Jip it would be a challenge, at 200watt the barriers will read for example 54 volt (100%), then you start a 1800wh kettle and it will drop to 52 volt, your calculation will now say that the batteries are at 80% or the likes. Now the kettle switches off and the volts go back to 54 volts or 100%. so in a space of 5 minutes the SOC went from 100 to 80 and back to 100%. and this will happen for every load that switches on and off... 

As you can see, this will never ever be an accurate way of doing it. 

The best option is to install a battery monitor, it will measure the coulombs in and out of the battery and give you a much more accurate reading of what the SOC/DOD really is. 

Noted,Thanks very much!

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