Compressing He for Weather Balloon Engine

[masterjoda]

Hi, I have a weather balloon and I would filled it with He and attach some weight and I would release He as balloon climbs and it will eventually stops at some altitude. So now I wanted compressor to acts like an engine because air is thin at 20-30km and I would put solar panels to provide electricity. Do you think this is realizable?

 

[Danger]

Can you explain what you want the power for? It seems to me that packing a couple of batteries along would be easier.

 

[masterjoda]

I think of the batteries too, but what when they discharge, I want somehow to charge them. But I don't know if solar panel would be enough.