question

blue-sails avatar image
blue-sails asked

Can the MPPT function of a charge controller be turned off?

I would like to turn off the MPPT function on a charge controller.

How can I do this?

I thank you in advance for any assistance you may provide.


Kind regards,

MPPT Controllerschargermppt charging
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2 Answers
Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

No that is not possible, that's how the MPPT charge controller works.
Why do you want to disable it?

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blue-sails avatar image blue-sails commented ·

Hi Matthias,

I would like to disable the MPPT function in the charge controller because it is in conflict with the MPPT function on optimizers that I am using with each solar panel.

The maximum voltage from a single solar panel is below the activation voltage for a single charge controller. In this case the activation voltage for the charge controller would be the battery voltage plus 5VDC or 53VDC, and the maximum voltage from a single solar panel is less than 40VDC.

Due to shading issues I require individual MPPT for each solar panel, and the smaller charge controllers from Victron are not an option since they do not have VE.CAN which I need as well.

I have been in touch with both the optimizer company (Tigo) and with Victron; however, there is apparently no interest on the part of Victron to make the optimizers compatible with Victron charge controllers.

Therefore, the only option (if I will use Victron products in this installation) is to disable the MPPT function in the solar charge controllers.

If you have an alternative path, I would be interested in knowing about it.

Kind regards,

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porcini avatar image
porcini answered ·

First I have to say that I normally don't like AC PV-Inverters in an offgird system. But If you use a Multi/Quattro maybe an AC coupled SolarEdge solution would be an option for you.

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