BlueSolar MPPT 75/15 Solar Controller > 15AH Lifepo4

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tim-cooper asked Sep 25, '20

BlueSolar MPPT 75/15 Solar Controller > 15AH Lifepo4

Hi All,

If I connected my 100W solar blanket up to this controller, set the profile for Lithium battery, would the output of the MPPT supply only up to max of battery Max Charge Current? i,e, will 15A be supplied to the battery even if it can only accept max 5A? will I ruin the battery? specs of battery are below.

SolarKing Lithium batteries are fully sealed with a built in battery management system (BMS) to make sure the battery operates safely.

Operating Temperature Range: -20°C ~ +60°C
Voltage: 12.8VDC
Amperage: 15AH
Max Discharge Rates: 10A
Max Continuous Current: 10A
Max 10 Second Pulse: 15A
Min Charge Current: 1A
Nominal Charge Current: 3A
Max Charge Current 5A
Charge Voltage 14.8V
Maximum Charge Voltage 15.0V
Cycles @ 100% DOD 2000 Cycles
Cycles@ 80% DOD 3000 Cycles
Cycles@ 50% DOD 3500 Cycles
Cycles@ 30% DOD 8000 Cycles
Low Voltage cut out: 10.0VD
Terminal T6.5mm

MPPT Controllers Lithium Battery amps

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Answer 1 · 2020-09-25T03:21:25Z

michelg answered · Sep 25, 2020 at 03:21 AM

Hi Tim,

a 100W panel will provide a maximum of around 5,9A. According to the fact that it almost NEVER reach a 100% power production, and furthermore the ampers are reduced during the charge, I don't see any real problem here.

Take a look at the specs of your solar panel.

Michel

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tim-cooper commented · Sep 25, 2020 at 04:27 AM

100W max @ 17.5V, so yeah would be unlikely to get it much over 5A, but regardless, would the battery just accept what it needs? or would going over 5 ruin it?

I will do as Matthias mentioned and adjust current, but would be good to know anyway

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michelg tim-cooper commented · Sep 25, 2020 at 07:03 AM

Hi Tim, you have performance losses, during the transformation of the power coming from the solar panel, also consider you almost never get a 100% power from the solar panel itself. Specs are laboratory values with very precise conditions.

I would not worry about it.

Michel

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Answer 2 · 2020-09-25T04:01:46Z

Matthias Lange - DE answered · Sep 25, 2020 at 04:01 AM

You can also adjust the charging current of the MPPT in the battery settings.

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