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christianf avatar image
christianf asked

MPPT: limits and exceeding of PV input voltage

Hi all,

even after reading through https://www.victronenergy.com/blog/2014/03/28/matching-victron-energy-solar-modules-to-the-new-mppt-charge-regulators/ and several posts here, I couldn't find an answer to my question:

Given there are two 200WP solar panels with Voc=46,6V and Vmpp=40V, connected in serial to a Smartsolar 100/30. Online MPPT calc says; it's a match. As long as you don't enter the temperature coeffients, which I'm trying to obtain since some days now by contacting manufacturer, searching online etc.

When playing around with values of -0,25% to -0,35%, the calculator jumps between Smartsolar 100/30 and 150/35.

Question: how hard is the voltage input limit really? What happens if it is exceeded by 0,1V or 1V or even 3V? Is there a tolerancy? Will it kill the MPPT or will it just shut off and be back again at normal voltage?

Thank you
Christian

MPPT Controllersvoltageovervoltage
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2 Answers
kevgermany avatar image
kevgermany answered ·

Hard limit. Will kill the MPPT.

You'll get away with a little, but best to play safe with the 150 or connect in parallel if you have a 12 or 24V battery

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over-and-under-victron avatar image over-and-under-victron commented ·
I'm curious....what is a little when exceeding voltage? One percent?
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peter-3 answered ·

46v for 200 watt panels ? , My 300 watt panel are only 34.1v @ 11.8a , so sound like your panel are high voltage low current , so can go parallel ? .

But that depends on what voltage of the battery 12v or 24v

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klim8skeptic avatar image klim8skeptic ♦ commented ·
It's all about the number of cells in series.

A higher number of cells equals a higher Vmp / Voc.

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Related Resources

MPPT Product Page

MPPT Error codes

MPPT 150/60 up to 250/70 Manual

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