Solar MPPT charger history shows voltages in excess of 15v. The maximum voltage setting is 14.2v. The shunt settings show the 14.2v . Why is the solar controller showing higher voltages that aren’t recorded on the shunt?
What kind of battery are you charging with it? If its a LiFePo with internal BMS then its likely that the BMS disconnected while the MPPT was charging, which led to the voltage spiking. Same could happen if a fuse blows
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It is 2x110ah Ecotree lithium batteries. The solar history shoes frequent maximum voltages in excess of 15v but these voltages are NOT recorded on the shunt history. so their seems to br dome logging issue with the solar charger. what can be done, please?
The battery can potentially be disconnecting charge which will cause a rise on the mppt side as the power being produced has nowhere to go.
It can also happen with a high resistance connection or a cable that is too small/long to the battery.
Maybe drop the charge voltage by about 0.2v if your cable is at least to manyal min spec.
Second thing to check if the mppt is reading the voltage correctly or overreading.
Yes, together with temperature compensation those 15.0V on the MPPT could just be absorption voltage compensated for cold weather
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Thank you for the replies. When the MPPT was in absorption stage, I read the voltage at the MPPT terminal. They were close to or identical with the Victron Connect readings. As the shunt is telling me that the batteries are NOT getting the 15v high readings, I conclude that there is some logging issue with the MPPT history.