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Battery+PV; problem with AC inverter effiency loss in DC conexion (battery)

  • Peon
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20 Aug 2021 07:38 - 25 Aug 2021 21:27 #9976 by Peon
Battery+PV; problem with AC inverter effiency loss in DC conexion (battery) was created by Peon
Hi,
I´m doing a model about utily scale PV plus storage with batteries, but I´m having problems with  the inverter effiency loss when I connect the batteries in DC conexion .
Specifically This losses are due to inverter thermal derate DC power loss.
This problem doesn´t happen when I connect the batteries in AC conexion.
 Does anyone know why this problem happens? and which is the solution? 
I´m using the module Longi 540m and the inverter powerelectronics 3270k.
Thanks you.

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Last edit: 25 Aug 2021 21:27 by pgilman.

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  • pgilman
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25 Aug 2021 21:31 #10004 by pgilman
Replied by pgilman on topic Battery+PV; problem with AC inverter effiency loss in DC conexion (battery)
Hi Jorge,

For DC-connected batteries, DC power from both the battery and the PV array is converted by the inverter on the Inverter input page.

For AC-connected batteries, the battery discharges through a separate inverter with a fixed efficiency that you specify as DC to AC conversion efficiency on the Battery Cell and System input page.

The inverter in the DC-connected battery case may experience more losses when it converts power from both the array and the battery.

Best regards,
Paul.

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