question

clamar75000 avatar image
clamar75000 asked

How to charge 2 separated batteries with only one MPPT ?

I have two battery parks, one for the engine and one for services.

The services park is charged with one Solar Pannel through a MPPT 75/15, but this regulator has only one output.

How should I do to also charge the engine park ?

Thanks a lot

battery charging
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1 Answer
Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

A few weeks ago I used an ArgoDiode to split the output of the MPPT.

https://www.victronenergy.com/battery-isolators-and-combiners/argo-diode-battery-isolators

3 comments
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offroadflow avatar image offroadflow commented ·
0,3V drop...

Never convinced me working with diodes in this case.

Solenoids are a solid solution. Should be named "Solidnoids" hehe

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Matthias Lange - DE avatar image Matthias Lange - DE ♦ offroadflow commented ·

Just increase the charging voltage about 0,3V.

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clamar75000 avatar image clamar75000 Matthias Lange - DE ♦ commented ·

Hi Matthias.

Thanks for your feed back, but I think that it is not a good solution since the MPPT is done to check permanently and precisely the voltage of the battery to be loaded. With the diode it is not possible and the battery won't be charged correctly.

The ArgoDiode documentation says that it is to be used with the alternator, not with a MPPT (and for that, the RagoFET is better than the ArgoDiode)

I think that the best solution would be to have a switch wich could switch automaticaly from one battery to the other one (when one is full loaded for example)

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