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Hi Miguel,

that is correct, at the moment the battery systems can only be connected to one inverter if the battery systems are DC coupled. You can change the amount of (equal) battery systems, however, so if your three inverters are the same, you can have 3 x inverter "xy" connected to 3 x dc battery system "abc".

Hope that helps, kind regards,

Martin

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Thank you Martin,

It does help, but then I have two more questions.

I actually thought I had an AC coupled battery system. Is that possible? How to change from an AC to DC coupled system and vice-versa?

Second, I don't understand how I can have 3x inverter conected to the DC battery system because I difined the battery system and the inverter in different tabs.

Again, thank you, 

Miguel

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Hi Miguel,

you can change the type of coupling in the battery system itself. Note that you can't change system database entries, you'll have to create your own, e.g. by copying an existing one:

grafik.png

 

What I meant with connecting 3 equal DC coupled battery systems to 3 equal inverters is that. On the inverter page you have 3 times the same inverter:

grafik.png

And then on the battery system page you'll have the battery system amount set to 3:

grafik.png

 

Hope that clarifies the doubts. If you have questions, please let me know!

Kind regards,

Martin

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Hi Miguel,

To my knowledge I haven't seen any option in PVSol to set the life-time of the battery. May be PVSol considers the degradation of the battery which inturn impacts the efficiency and eventually the energy that can be stored in the battery.

 

-Vishnu

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Hey Miguel,

the lifetime of the batteres is influenced by two effects: cycle loads and time. So there are the "cyclic lifetime" and the "calendar lifetime", the first of which we can calculate, and the second is more a number that is given by the manufacturer (determined by tests).

The calculation of the cyclic lifetime is described here (at the end of that page, applies also for li ion batteries:

https://help.valentin-software.com/pvsol/2020/calculation/battery-systems/lead-acid-batteries/

According the standards, we consider a battery as "dead" when it has reached 80% of its initial capacity. It is then replaced by a fresh one.

Hope that helps, kind regards,

Martin

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