Which MPPT charge controller?

DIY
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1

Hello, I have a question. Is the MPPT charge controller 100/30 the right choice?

It is for 2 solar modules, connected in series (300W).

Technical data of one of my solar panel:

  • Power Output: 150W Max
  • Cell type: Monocrystalline silicon
  • Power Voltage：19.38V
  • Power Current：7.7A
  • Open Circuit Voltage：22.78V
  • Short Circuit Current: 8.13A
  • Operating Temperature: -20℃ to +60℃
  • Storage Temperature: -20℃ to +60℃

Battery is a lithium battery LiFePo4 with 12v.

I would like to use it in my camper. Thanks for your help.

2

It looks OK, but check this on the Victron MPPT calculator.

1 Like
3

Thanks for your answer. In the calculation it shows me a MPPT charge controller 100/20. I like that it has load outputs. I’ll do the maths again later. On another page I was shown the changer 100/30.
Does anyone know what additional equipment I need for a 100/30 if I want a 12 V plug and LED light?

4

You have 300W of solar, at float voltage, the 75/20 will pass 270W to the batteries so the device will be 10% over panelled. The calculator allows to 30% over panelling as perfectly normal. You will not get the very peak power, but will over a day average pretty close to the same energy in kWh.

If you have a lithium battery with a proper built in BMS then the BMS will protect the cells from over discharge so you do not need any more kit.

The advantage of the 75/20 with load output is the load outputs can be more than a low voltage shutdown and can have some better control options.

You can get these same load algorithms with the 100/30, but you need a VE.Direct TX digital output cable and a Battery Protect to act as the on.off relay. This is all in the manual Section 5.

5

Thanks for your help. Your answers have helped me and you made my day.

6

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