When you said Solo solar mining what do you mean exactly? Because to me it sound like you want to solo mine Bitcoin? If yes then you should understand that solo miners don't make profits every day, it can take weeks or months before you solve a block.
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This Canaan Avalon mini 3 with 37.5TH, the reason why I like this one is the power draw of 800watts only and it is profitable for non solo miners too.
FWIW your statement is true when the solo miner have tens or hundreds of latest generation ASIC. But with single Canaan Avalon mini 3, it would take longer than human lifespan according to
https://solochance.com/.
I tried using the calculator, and it shows that it would take 408 years for a miner with 37 TH/s to solve a block. Interestingly, a Bitaxe miner with 1.2 TH/s successfully solved a Bitcoin block a few days ago, which was covered in the news, and several BTC mining YouTubers created content about it.
The Canaan Avalon Mini 3 has performance comparable to that of 35 Bitaxe miners, making it a better option for solo miners. However, it's important to note that solo mining is primarily based on luck, so it's best suited for those who are willing to take the risk.
Anyone considering these options should also think about power consumption: the Bitaxe miner uses only 25 watts, while the Canaan Mini 3 requires 800 watts.