How do I select the proper MPPT

DIY
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1

Hi, I am DIY. Which MPPT do I select.

Solar Panel (Pmax) 315 W

Open Circuit Voltage(Voc) 46 V

Max Power Voltage(Vmp) 38 V

Max Power Current(Imp) 6.45 A

My existing system is LiFePO4 12.8v, 100Watt

Which MPPT do I choose?

Thanks, WineO

2

Use the mppt calculator

3

As above use calculator.

If you may be considering upgrade at a later date, use calculator / get next size up mppt for possible upgrades, going up a size wont hurt , as long as it suits battery voltage.