October 6, 20214 yr Hello all, A bit of an odd one, for me anyway. There's likely a perfectly logical explanation for this behavior that just eludes me. Every morning when the Solar charge controller kicks in and PV power starts trickling through I notice a significant drop in SOC as reported in the Growatt App as well as Solar Assistant. Logs show the battery SOC goes from 100% all the way down to a reported 50% and then within a short period back to 100%. This happens every morning just as the Solar Charge controller kicks in. I'm wondering why this happens and if my battery bank health is being compromised in any way by this happening. Chalked it down to a glitch in the SOC state reporting but it's starting to bother me now. For reference : Growatt SP5000TL HVM 4x AGM Batteries Edited October 6, 20214 yr by JoeyhZA
October 6, 20214 yr @JoeyhZAhi it's nothing to worry about. The SoC that you see without a bms is just a guesstimate based on the voltage the inverter sees. The voltage drops when your inverter switches to Sbu from bypass the load drops the battery voltage. It's normal baviour with gel/SLA batteries as they don't have a bms. Or any accurate way of reporting SoC.
October 6, 20214 yr Author I suspected something along those lines - thanks for confirming and allaying my fears @Buyeye
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