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June 3, 2025 8:29 am
I’ve been running a hybrid solar setup for a while now without any major issues—until recently. Lately, I’ve noticed that my system is pulling from the grid much earlier in the night, even though my solar batteries show as fully charged by the end of the day (according to the inverter and BMS).
Here’s the setup:
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2 x 48V 200Ah LiFePO4 batteries in parallel
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6kW hybrid inverter
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Around 5.5kW solar coming in
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Night-time loads are pretty light (fridge, modem, a couple lights)
Usually, the batteries hold up fine through the night and still have 40–50% SoC by morning. But over the past week, they’ve been dropping to about 20% by 2–3 AM, and then the inverter starts using grid power. I haven’t added any new loads, so I’m scratching my head here.
Could this be something like battery imbalance, BMS miscommunication, or maybe a low-level parasitic drain I haven’t noticed? Also wondering if temperature or cell drift could be playing a role?
June 3, 2025 12:11 pm
You might need to recalibrate your SOC. Running your batteries down to 47 volts then back up to 56.4 or so should recalibrate them. You will probably need to do this 6-8 times. You could also switch over to lead acid and run on volts for a bit. That would help you diagnose if it is a SOC calibration issue. As always for the best advice call Tec support. Good luck and let us kuwhat you figure out.
June 6, 2025 1:27 pm
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