BlueSolar MPPT 150/60 system - voltage but no current

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mathijs-tas asked Feb 28, '22

BlueSolar MPPT 150/60 system - voltage but no current

Dear all,

I made an off-grid solar system with six solar panels, battery storage (24V) and a 24/230V converter station. However, something is off with the charging of the battery, since it is slowly discharging and now at 52% SoC. During the day(light) the voltage increases to 28V - but it seems there is no current (A).

Where in the system could be the problem? e.g. MPPT settings, battery type, solar panels.

I monitor the system with the VRM - portal. This is the output for 17 Feb - other days are the same:

I used:

6x Solar Modules 265 Wp (worked before installation and give voltage output) (2 strings of 3 in parrellel)

1x Victron MPPT 150/60 Solar Controller

2x Beaut 12v/120Ah AGM batteries

1x Victron Phoenix 24v/230v converter (which is working)

MPPT Controllers battery charging battery battery system voltage

victron-battery-charge.png (28.5 KiB)

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Modifications Space

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Answer 1 · 2022-02-28T19:57:03Z

snoobler answered · Feb 28, 2022 at 07:57 PM

Looks like your float voltage isn't set.

Please include snapshots of your MPPT configuration including expert settings.

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Answer 2 · 2022-03-02T04:12:46Z

snoobler answered · Mar 02, 2022 at 04:12 AM

Additionally, if you do not have your MPPT attached to the load/charger side of the shunt, it won't see your incoming current.

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Answer 3 · 2022-03-04T07:22:28Z

mathijs-tas answered · Mar 04, 2022 at 07:22 AM

Thank you for your answers

I will try to share the MPPT configuration as soon as possible.

As mentioned it is an off grid system, quite far from where I live. I installed a GX portal - however this conveys the battery monitor and the converter (not the MPPT..)

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Answer 4 · 2022-03-04T07:53:00Z

ejrossouw answered · Mar 04, 2022 at 07:53 AM

You are using the wrong charge profile LifePO4 for your AGM batteries. Either use the default setting or manually set per the manufacturer's recommendations.

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mathijs-tas commented · Mar 04, 2022 at 07:55 AM

Hi - just noticed that I was sharing some older settings. Thank you for noticing!

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Answer 5 · 2022-03-15T08:40:37Z

mathijs-tas answered · Mar 15, 2022 at 08:40 AM

Thanks for everyone's help, looks like the batteries are charging now. And the system working :)

Went to fix the problem with the battery charging.

- We switched the GX control (VE direct) from the battery modus to the MPPT. Now I monitor the the MPPT instead of the battery status.

- Changed the settings of the battery (Smart Shunt) (which gave the battery status). The settings were still on 12v (I'm guessing this was also a problem).

Now the solar panels are delivering energy to the batteries and I'm able to monitor the output. The MPPT monitors the battery voltage - this is above 25v at all times (indicating that the batteries are full). The MPPT does float charging (also indicating that the batteries are full).

If you guys have any other tips - I'm all ear!

1647333193906.png (55.8 KiB)

1647333674735.png (272.6 KiB)

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