Battery temperature

Dear Sir,

1. See attached files. It seems that the battery temperature values are wrong.
2. Is there a way to run the Detailed PV+Battery simulation without the financial model? {With the financial model the calculation time is rather long}.

I'd much appreciate your help.

Respectfully,
Gur Mittelman.

Hi Gur,

Please try setting the environment temperature option on the Battery Cell and System page (under "Battery Thermal") to Enter single fixed temperature, and then set the single environment temperature to the expected average ambient temperature of the air surrounding the battery. Alternatively, you can choose Enter time series temperature and then import time series (hourly) environment temperature set to 0°C. Your file uses the time series option with ambient temperature set to zero for all hours, which causes the battery temperature to be low.

 

SAM's battery models require a financial model because some options interact with the financial model for dispatch and life cycle calculations.

Best regards,
Paul.

Thanks Paul,

I updated the battery environment temperature to single 25C value and run it again.
The output battery temperature is now very (to) close to 25C in all time steps which is still surprising since during charging or discharging, the battery temperature is supoosed to exceed its environment due to internal heating.
See attached.

Hi Gur,

The small difference between the battery temperature and battery environment temperature is due to the heat transfer coefficient, h, under "Battery Thermal" on the Battery Cell and System page. The battery only heats up when it is being chraged or discharged and cools when it is not being charged or discharged.

The default value of h suggests a battery with active cooling that maintains the battery temperature.

In your file, each charge and discharge period is followed by a period of rest, so the battery has time to cool before each heating cycle.

 

Best regards,
Paul.