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A problem we ran into when we tried our first “$10 box” was the input voltage was only 25V. None of the controllers I’ve looked at had any specs listed as to max input voltage. Any idea where I can find that info before ordering? Also, any other pro tips to avoid by fake mppt’s?

I don’t think she has much money to spend. Her aim so far has seemed to be making the stuff she has work with the least possible additional expenditure. I appreciate your helpful design input logic.

Her system is setup for 12V. Thanks for your helpful response.

I’m trying to help a friend get started with some stuff she was gifted. The guy she got it from supposedly has some “documentation” he sent her that I haven’t seen. According to her, he had these 2 panels (pictures of the labels included in attachment) hooked up to a “$10 box he got from Amazon”...