Smart MPPT has voltage but no amps

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cherrypirate asked Sep 12, '22

Smart MPPT has voltage but no amps

My BLUE SMART MPPT 100/20 Controller is showing a voltage from the solar panels but no amps.

This networked to a BatterySense which shows a battery voltage of 13.8v which is correct at the batteries but is not showing correctly in the MPPT controller (14.19v)

The batterySense and the MPPT are networked but apparently are not working together. The settings for the MPPT are set for Lithium batteries and are shown below

It has worked about 10 days ago but has not worked for the past week.

The state of charge for the batteries is currently 54%

Please can someone advise what can be done to get the system working again.

MPPT SmartSolar

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img-0845.png (269.2 KiB)

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Modifications Space

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Answer 1 · 2022-09-12T11:20:03Z

Louis van der Walt answered · Sep 12, 2022 at 11:20 AM

As far as I know you need your PV voltage to be about 5V higher than your battery voltage before the MPPT can activate. You are around that voltage, so it might be worth depleting your battery a bit and see if it will charge if your battery is around 11V-12V.

That said you are going to keep getting issues if your PV voltage is that low, so you might need to look at a higher voltage PV panel or 2 in series.

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nickdb ♦♦ commented · Sep 12, 2022 at 11:21 AM

closer to 6V

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Answer 2 · 2022-09-12T11:34:35Z

Trevor Bird answered · Sep 12, 2022 at 11:34 AM

@CherryPirate ....The connection between the MPPT output and the battery terminals is apparently open circuit. The MPPT output voltage should be the same or extremely close to the battery terminal voltage as they are effecticely the same wire. No current is flowing because something between the MPPT output and the battery is broken. Fix that and things will improve enormously.

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