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New Fogstar 15.5kWh upright solution

 
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Last Post by Batpred 2 hours ago
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 Batpred
(@batpred)
Reputable Member Member
Joined: 10 months ago
Posts: 158
12/11/2025 8:21 pm  

Posted by: @batpred
↑

2. Fogstar SEPLOS is the one where the old 1.3 firmware cannot be updated after over a week of calls. 

It should be said that I used plenty of products costing a tiny fraction of what these batteries did over the last few decades. Those firmware updates usually work first time, with robust processes around it, etc. 

For the common benefit, a quick update on this. 

Fogstar initially said they would support the Ginlong/Solis protocol on the Seplos BMS that they sell. 

We were going to try top have Seplos try to actually do the upgrade by remotely accessing a client laptop. In the end, the firmware upgrade worked with a new version of the upload software on a fresh install of windows 11. I have not seen anything letting me know this is being factored in instructions that would save future customers these tricky issues. 

I would absolutely not recommend taking the DIY approach with these lithium based batteries. Even an experienced installer will find it unnecessarily complicated, unless they are just building a second battery. 

Also, I still do not have the cells "balanced", they do not seem to charge to 100%. 

 



   
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