If you are talking about the amorphous shingles don t do it it is basically an entire re roofing the panel cost.
Amorphous solar panel low light.
Competition solar 47701 20 watt amorphous solar panel with 8 amp charge controller and 12 volt battery charger by competition solar only 6 left in stock order soon.
As the name suggests they are made from a single large silicon crystal cut from an ingot.
You can still do it best mppt controller 40 amp http amzn to 2ggyi44 best low light sola.
When you consider that low light ie cloudy equals about 1 10th to 1 100th of sunny solar power and extra 5 of 10 or less is not much.
In a direct comparison with mono or polycrystalline panels amorphous cells outperform them in low light conditions.
Thin film solar are the best solution but stion is hard to get.
For the portable operator this translates into charging batteries far earlier and continuing to charge them later in the day than operators using mono or polycrystalline panels.
Amorphous is lower cost than crystalline although it s less efficient in converting sunlight to energy and as a result requires a larger panel to deliver the same power as a smaller crystalline panel.