SmartSolar MPPT not charging FreedomWon battery past 90%

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chris-5 asked Jan 15, '24

SmartSolar MPPT not charging FreedomWon battery past 90%

Hi there

I have a site with the following setup:

1. 5kW Multiplus II

2. 1 x SmartSolar MPPT 250/60 with 8 x 375W PV panels

3. 1 x SmartSolar MPPT 250/60 with 8 x 380W PV panels

4. 2 x FreedomWon 10/8 LiFe batteries

5. Color Control GX

The system will start off in the morning charging at 100% (using all the available solar power). Then when the battery reaches 90% the one SmartSolar MPPT will almost switch off. The one MPPT will charge at +-1800W which is the size of the load and the other MPPT will charge at +-10W. This means the battery does not charge to 100%.

If I change the settings so that the system exports power, both MPPTs provide all the available power which was +-4400W at that stage.

Any ideas why this would happen? I replaced one of the MPPTs recently and did Firmware upgrades on the whole system and now I noticed this.

Kind regards

Chris

battery charging MPPT SmartSolar smart solar charging behaviour freedom won

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Mike Dorsett commented · Jan 15 at 07:15 PM

If you are changing settings to "export power" then you must have a Venus GX device, that is not listed in the equipment above. The voltage settings programmed here will set the max charge voltage. SOC is a concept rather than a physical parameter.

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chris-5 Mike Dorsett commented · Jan 19 at 12:27 PM

Hi Mike

Yes, I have a CCGX on the system. The Voltage is set at 55.8V as recommended by the battery manufacturer. It does not reach that, it stops charging at 54.9V.

Regards

Chris

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Modifications Space

Node Red Space

Answer 1 · 2024-04-05T13:11:24Z

jason-lane answered · Apr 05 at 01:11 PM

Check the battery voltages being reported by the MPPTs and compare to the voltage being reported by the battery itself (the BMS). If the MPPTs are reading a higher voltage than the BMS, they may think the battery is already full. This was happening to me, and I found that enabling Shared Voltage Sense (SVS) in the DVCC section fixed the issue. The MPPTs now reference the BMS battery voltage.

You can read more about using DVCC here:

https://www.victronenergy.com/media/pg/CCGX/en/dvcc---distributed-voltage-and-current-control.html

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