![www.fogstar.co.uk](https://www.fogstar.co.uk/cdn/shop/articles/Cover_BLOG_2_07e3fc38-e2ed-43ac-9ecb-5bbd4c740c08_2520x630.png?v=1712139641)
Unveiling the Future of Solar Storage: A Deep Dive into the Fogstar Energy 15.5kWh Battery
The Fogstar Energy 15.5kWh Battery rewrites the storage narrative, transforming sunlight into a reliable, on-demand energy source, empowering you to break free from the limitations of the grid.
![www.fogstar.co.uk](https://www.fogstar.co.uk/cdn/shop/files/favicon-32x32_32x32.png?v=1614302359)
Fogstar lists sunsynk as an acceptable inverter for this Battery pack.
The issue: On first install - I charge my battery pack to 100% (after a sunsynk factory reset, this works on the first night)
Every cycle after this, the sunsynk will charge and 1% lower each day (cycle)
Today was 93%. Tomorrow will be 92%.
If I factory reset the sunsynk it will charge to 100%. The BMS is communication with the inverter - the screen is showing values and the BMS_ERR does not show an error.
The user timer works as described. I changed over the AGM-V and adjust thed voltages - Shutdown works fine.
Voltages are set to 57.6 & 55.2V.
I am at a loss and both Sunsynk and fogstar support have not got a solution...
HELP please
![1716221503191.png 1716221503191.png](https://diysolarforum.com/data/attachments/216/216550-75d58d15154b49c67a8d7e3a07dd445e.jpg)