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NederlandBlog - Solar regulators
FAQ: solar charging voltage levels (12V system)
Question: My MTTP controller can deliver the full power of the solar array to achieve the voltage of the absorption phase. This voltage is 15.40 volts. To finish charging the battery, it stays at 15.40 volts for a period of 180 minutes. Then the controller moves to the floating state at a voltage of 13.40 volts. Is this OK for the Lithium Cells (4 cells at 12V)?
Answer: No. This is not good at all. We do not recommend using the „absorption“ or „floating“ modes that are designed for lead-acid batteries. These modes must be turned off. This means the charging of the lithium battery must be fully stopped as soon as the voltage reaches 15.40V (or less: 14.60V to 15.00V). The charging can be restarted after the voltage battery drops bellow 13.00V (or 12.80V to 13.20V).
