Battery losses during the charging

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Antonio
Topic Author

08 Nov 2023 17:39 - 09 Nov 2023 03:11 #12629 by Antonio

Battery losses during the charging was created by Antonio

Hello everybody,

I am modelling a 49 MW stand-alone system with a capacity of 2 hours.

When analysing the results, I have seen that there are high losses when the battery is charging, as it absorbs 25% more energy from the grid than it subsequently discharges. I attach a screenshot of this.

I don't know if this is a common behaviour in battery systems (Can someone explain the typical losses of a BESS?) or if I have misconfigured some parameter (if so, how can i solve it?).

I would appreciate your help.

Best regards

File Attachment:

File Name: Stand-alone.sam
File Size:2,630 KB

Last edit: 09 Nov 2023 03:11 by Paul Gilman. Reason: Insert image as attachment

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Paul Gilman

09 Nov 2023 03:27 #12632 by Paul Gilman

Replied by Paul Gilman on topic Battery losses during the charging

Hi Antonio,

For the front-of-meter automated dispatch, SAM attempts to charge the battery when the price of electricity is low, and discharge when it is high, taking into account the battery state of charge, and maintaining battery health to minimize battery replacement costs. The following outputs from your file show this behavior:

Best regards,
Paul.

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Antonio
Topic Author

10 Nov 2023 09:18 #12635 by Antonio

Replied by Antonio on topic Battery losses during the charging

Thank you for your reply.

So, is it normal for a 98MWh capacity battery to draw 119.19MWh from the grid to charge 90% of the battery?

Thanks again.

Antonio

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Paul Gilman

11 Nov 2023 01:02 #12636 by Paul Gilman

Replied by Paul Gilman on topic Battery losses during the charging

Hi Antonio,

The battery voltage model, conversion efficiency and battery loss inputs on the Battery Cell and System page determine how much energy is required to charge the battery.

The voltage model is described in Section 2.1 of DiOrio, N.; Dobos, A.; Janzou, S.; Nelson, A.; Lunstrom, B. (2015). Technoeconomic Modeling of Battery Energy Storage in SAM. 32 pp. NREL/TP-6A20-64641 ( PDF 2.6 MB ).

Best regards,
Paul.

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