Question Using the weekly settings option for FlexBoss21 and setting battery SOC on a daily basis

mccorb · 2025-11-28T15:44:13Z

I've got a couple of Flexboss21 inverters and wall mount batteries. I have the batteries set to use SOC. I use the AC Charge and Peak Shaving working modes to control how the inverters act so I can minimize my electrical usage between 2PM and 7PM. I am planning to switch to the 'Weekly Set' option so I can just use Peak Shaving mode Mon-Fri. I have two issues I want to address 1. When in Weekly Set do the inverters respect the 'Battery Setting->Batt Charge Control' for whether to use SOC or Voltage to control charging? The user interface requires me to set them both in the AC Charge section to save the settings but surely it is only using one of them, right? 2. I want to charge the batteries to about 85% usually but once a week I want to charge them to 100% for a while to keep them in balance etc. I've read that this helps the battery BMS. I was hoping to be able to set the max charge for different days to different values but I don't really see how to do that. I can have the AC charge limit the max SOC on a daily basis but that won't preclude the solar panels from charging them to the max every day if I set the Battery Setting to 100% SOC.

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David271

(@david271)

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December 15, 2025 11:31 pm

Thinking more about the difference between voltage and SOC charging limits, I can think of some cases where sticking with SOC charging would be slightly preferred. Like in the summer I might want to charge up to 80% SOC 6 days a week, and go up to 101% one day a week to make sure the battery got completely full. The 80% charge is just to leave some extra room for afternoon sun to top off the battery instead of going back into the grid. Charging by voltage is great if I want to go completely full but not so great for hitting an intermediate voltage.

So having the weekly set able to use 101% SOC to fill the battery up completely once a week might be the best solution for me.

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Question Using the weekly settings option for FlexBoss21 and setting battery SOC on a daily basis

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