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fulltime-2020 asked

SmartSolar 100/30 MPPT Battery Voltage Fluctuates on App

New here. I have a SmartSolar 100/30 12V. I noticed the APP says Battery Voltage of 7.36 to 8.94 and sometimes spikes up to 13.xx or so.


I measured the voltage at the battery terminals on the 100/30 with my Fluke 87. It says solid fluctuating only at 13.29 to 13.30.


I have checked all of my connections. Everything is tight.


Settings; Pos 7, Battery Voltage 12V, LiFePo4, Temp Comp Disabled (all standard settings for Pos 7)


1) In Bulk Charging. Should this read the actual voltage measured at the Battery Terminal on the 100/30 or is this normal?


2) It says Firmware is v1.59 Bluetooth Interface (Rev2) Firmware v2.41 Bootloader v1.16


Thanks for any clarifications!

smart solar charging behaviour
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2 Answers
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kevgermany answered ·

Battery voltage reported by the MPPT should always match battery voltage measured on a meter. It shouldn't fluctuate the way you describe.

From memory your software is up to date.

First guess would usually be a wiring fault between the battery and the MPPT. Possibly the inline fuse. But as the meter says correct voltage at the MPPT, must be a faulty unit which needs to go back to the dealer.

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fulltime-2020 answered ·

Just to clarify, the charge controller says it only charges when the voltage is 5V above the battery voltage. The Smart Solar app should display 13.29V on the battery voltage not 13.29 minus the 5V?

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