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Post Info TOPIC: Mystery voltage boosting from MPPT controller/regulators ? Info required please.
Jaahn


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Mystery voltage boosting from MPPT controller/regulators ? Info required please.
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Hi smile

I have started a new thread to avoid disturbing the original discussion on another thread. hmm We could have a useful discussion on this subject.

On another thread there was a comment made that MPPT controllers/regulators will boost the voltage from the solar panels when it is too low to a higher figure enough to charge the battery. It has been claimed before ! I would like people who believe this, to give me the brands/models of any sold that they believe do this. Restricted to units sold for mobile use please not large house units. 

We all know that DC to DC chargers do this as part of their normal function. Some may have an auxilary function of taking a solar input and charging the battery with that also. Again any brands/models known that are capable of accepting solar and boosting the voltage of the solar panels.

I am genuinely interested and will look at the specs for any brands/models mentioned to see if they will do this voltage boosting as I do not know of any that actually do this. disbelief

I would be happier too if this did not get into a useless discussion about relative merits of other things. We could move the knowledge base along a bit if we add all our information together.

Jaahn   



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Bagmaker


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www.gsl.com.au/bmppt1500.html
there smaller versions of the same thing from GSL
also
Genasun in the USA

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T1 Terry


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Bagmaker wrote:

www.gsl.com.au/bmppt1500.html
there smaller versions of the same thing from GSL
also
Genasun in the USA

The note line is interesting:

 Note 1: The panels open circuit voltage must always be lower than the battery charge voltage.

 

Makes it rather difficult to charge a 12v battery that has been discharged to 10.5v eh, isn't that the big plus for MPPT controllers?

 

T1 Terry



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Jaahn


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Posts: 1947
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Bagmaker wrote:

www.gsl.com.au/bmppt1500.html
there smaller versions of the same thing from GSL
also
Genasun in the USA

 Hi Bagmaker smile

Thanks for those two references. As far as I understand the specs, they both make some boost Mppt reg/controllers but they are not regular units for 'normal' charging use. Both offer other models for that. The "boost" models are for charging higher voltage batteries from lower voltage panels. As specified the panel voltage must always be below the battery voltage biggrin

Those two manufacturers do not make a unit which will do normal MPPT charging and then do a 'boost' to panel voltage if needed. 

Keep the suggestions coming in please. 

Jaahn

PS generally speaking if the 'normal' panel voltage drops too low then it is not worth boosting the voltage as the power available is so low anyway, almost nothing.no 



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PeterD


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T1 Terry wrote:
Bagmaker wrote:

www.gsl.com.au/bmppt1500.html
there smaller versions of the same thing from GSL
also
Genasun in the USA

The note line is interesting:

 Note 1: The panels open circuit voltage must always be lower than the battery charge voltage.

 

Makes it rather difficult to charge a 12v battery that has been discharged to 10.5v eh, isn't that the big plus for MPPT controllers?

 I think you missed the bit  Designed to charge 24V batteries from 12V panels or float charge 48V batteries from 12V or 24V panels

A 24 V battery that has a terminal voltage of less than a 12 V panels Voc is really sick. You would not get that very often.



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PeterD
Nissan Navara D23 diesel auto, Spaceland pop-top
Retired radio and electronics technician.
NSW Central Coast.

 
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