question

peromb avatar image

BlueSolar MPPT - Batterylife algorithm thresholds

Hello,

We're using BlueSolar MPPT 75/15 for solar street light application. The LED source is connected directly to the load output of the charger.

I know, that the Batterylife algorithm is changing the load disconnect/connect voltage thresholds, according to how the battery was charged. But what are the actual thresholds for the 12V system, what is the absolute low/high disconnect/connect voltage and what is the daily increment, if the battery was not charged again?

Knowing this would help a lot configuring the light, taking into account the voltage drop in the cables, and also solving some issues with cases where light doesn't switch ON at all.

Many thanks and kind regards,

Peter

MPPT - Solar Charge Controllerbattery charging
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3 Answers
Martijn Coster (Victron Energy Staff) avatar image
Martijn Coster (Victron Energy Staff) answered ·

Hi @PeroMB,

Below the requested information:

The batterylife operating range is:
switch on voltage range: 13.1V .. 14.2V
switch off voltage range: 10.8V .. 13.2V
The daily increments are: 0.2V


best regards
Martijn Coster - Victron Energy

4 comments
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Hi @Martijn Coster (Victron Energy Staff), does this also apply for the MPPT 100/20?

If I understand correctly: 10.8V is absolute minimum (almost zero).
After a day of charge, the bottom limit will be +0.2 = 11.0 V?

And so on?

Hello @Martijn Coster (Victron Energy Staff),

is there any way to avoid to go so low on the switch of?

10.8V is a really low point, then the life of the battery could be very short.


Thanks

@IvanMmM There is a really easy way to avoid going so low. Use the Victron Connect app and connect to the MPPT. Then in the configuration menu you can set a user defined algorithm for the load output. Het you can set you own voltage levels.

Martijn Coster -- Victron Energy

Sorry, you can provide the same info for a 48 V TAB PbZ battery?

solguy avatar image
solguy answered ·

Thank for this value,

When a complete recharge occur the switch off voltage return to 10,8 volts ? , Is there a way to change this on app ?

Is it possible to use a VE.Direct TX digital output cable (PWM light dimming cable) ASS030550500 to drive Phoenix or Multiplus inverter with this algorithm ?

Thanks for your answer


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peromb avatar image
peromb answered ·

Thank you very much!

I really appreciate your answer, it’s very helpful.


Kind regards,

Peter

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