Battery not operating at full power

Hello

Kindly look into the below

I am simulation a 200MW 200MWh PV + DC coupled Battery Storage
Application : Capacity market - Dispatching flexible capacities over the day

A sample case for a typical day
4AM to 5AM : Charge battery to Max SOC (1C charging @200 MW)
5AM: BESS system is ready and waits for any dispatch command

Say 8AM, 01PM, 07PM, 09PM: Dispatch commands (each 0.25C)
Remaining time - normal PV operation

The above is configured under manual dispatch section
But the battery never operates at the intended power level

Its always charging and discharging at very low C rates
But PV is operating at its rated power
Any idea why such a behavior ?

Thanks for the info in advance

Hello,

When you size the battery, the size in kWh divided by the power in kW represents the number of hours of storage available at the full discharge rate. For example a battery size of 200 kW / 400 kWh could supply 200 kW of power for 4 hours on a single charge.

You might decrease the discharge rate from 1 to something like the default value of 0.5.

The DC to AC ratio is 45, meaning that the array nameplate capacity is much larger than the inverter capacity.

It looks like you changed the inverter temperature model parameters to invalid values. I would recommend using the default values unless you have a reason to change those.

You might try using the "Set desired bank size" option for the battery to let SAM suggest battery size parameters for your initial simulations until you familiarize yourself more with how the model works.

Best regards,
Paul.