question

adlerrobert avatar image
adlerrobert asked

MPPT Calculator and spreadsheet differ

I try to size a MPPT charge controller to the correct size of of the PV array. But when I use the online version of the MPPT calculator I am getting different suggestions than in the Excel spreadsheet. Which one is correct:

Installation:
24V system with 400Ah LiFePO4
6x Victron 175-12 Solar Panel (3-series, 2 Parallel)

Excel: SmartSolar MPPT 100/50
Online Version: SmartSolar MPPT 150/35

What would be the best/correct solution?
Thanks for any help.

Excel:


Online App:

Excel result for Online App suggestion:

MPPT SmartSolar
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1598281135221.png (143.3 KiB)
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3 Answers
Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

There are a few similar questions to this topic.

If you click on "Calculation" in the online calculator you will also see that with the 150/35 you will be limited.

If you want the full potential of your array you should use the 100/50.

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klim8skeptic avatar image
klim8skeptic answered ·

The 100/50 is the same cost. No brainer.

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sunwisegwh avatar image
sunwisegwh answered ·

Is there a download for the current version of the regulator calculator tool


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