Cheap RYOBI 18/40V Solar Charging

I'm always looking for ways to charge my 18/40V Ryobi batteries when I'm boondocking with my trailer or out bike camping. I have been using a Genasun MPPT Solar Boost Controller on my eBike trailer, but they are expensive (and very nice). I recently found this MPPT Solar charge controller from China. It's not waterproof, but it allows the user to specify the battery voltage. It works very nicely with the RYOBI 40V charger that takes 42VDC input.

Parts used:
MPPT Solar Boost Controller ( https://amzn.to/3MkUEeI)
MC4 connectors ( https://amzn.to/38NQwlM )
XT60 connectors ( https://amzn.to/2QdsEBC )
100W Folding Renogy Solar Panel ( https://amzn.to/3Mi9YsA)
100W Rich Solar Folding Solar Panel ( https://amzn.to/39mhTpY )
Ryobi 40V Charger ( https://amzn.to/2ODVXwK )
Ryobi 40V 6Ah ( https://amzn.to/381aWqY )
Ryobi 40V 4Ah ( https://amzn.to/385hrZO )
expensive/waterproof Solar Boost Controller ( https://amzn.to/3vwLUtQ )

3D Model for Ryobi 18V Charging clip: https://www.prusaprinters.org/prints/...

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