If I analyze the same off-grid system—with the same PV array, the same consumption, and the same PV inverters—but change the battery configuration from 1 to 2, the fuel consumption is 11,000 liters in the first case and 20,000 liters in the second. How is this possible? Furthermore, the configurations shown on the screen do not reflect reality; since both are three-phase inverters, only one battery inverter would be needed—not three—but the software does not allow me to change this.

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Hello,

Thank you for your inquiry.

Planning stand-alone systems in PV*SOL is based on the SMA Off-Grid Configurator program, which we originally developed for SMA. This program contains the design rules that SMA has specified for us. These rules cannot be changed or deactivated. For example, only systems with AC-coupled battery systems can be planned; DC systems are unfortunately not possible. We understand that these rules may not necessarily apply to other manufacturers and may entail further limitations.

For greater flexibility in component selection and improved transparency during the planning process, we recommend that you initially plan your stand-alone system as if it were a grid-connected system, as described here.

Feel free to send us your project files (*.pvprj) to hotline@valentin-software.com so that we can take a closer look at it.