There is a huge difference in losses between charging and discharging

[Johan van t Wout]

"Hello, I have a question regarding the following. I have designed two nearly identical systems in PVSOL. Both have 4.4 kWp of PV capacity, the same battery type with 19.2 kWh storage, and both use a hybrid inverter: a Growatt SPH3600TL BL-UP and a Solis S6-EH1P3.6K-L-PLUS. There is such a large difference in battery losses that I don’t understand the cause. Who can help me? I am uploading a spreadsheet with all PVSOL input values for the battery, the PV inverter, and the battery system. With the Growatt configuration, the loss is 819 kWh/year, while for the Solis, it is only 233 kWh/year."

Growatt

 

Solis

I hope someone can help me out on this.

Many thx

 

Kind regards

 

 

Data Solis and Growatt PV Inverter - battery system and battery.xlsx

[hotline_oh]

Dear Johan van t Wout,

Thank you for your inquiry.

Please send both project files (*.pvprj) to hotline@valentin-software.com, so that we can take a closer look at them.

[Johan van t Wout]

Ok I will do that, many thx

[hotline_oh]

Dear Johan van t Wout,

Thank you for sending us the project files.

The reason for the discrepancy is the different efficiency curves of the hybrid inverters. The Ginlong Solis has a slightly higher efficiency, especially in the partial load range.