Alternatives to solar panels

I live within city limits, but I can survive on the many pots with plants growing all over my room including Oranges and avocado trees.  I do not have much room left for solar panels and I am a IPF (Idiopathic Pulmonary Fibrosis).   I live in Puerto Rico and we get hurricanes often and when Maria came, the whole island was dark, and some places took over a year to get power. I depend on concentrators for Oxygen, air purifiers, nebulizer , etc. I saw an advertising of a Solar Innovation System for $39. I don't mind the price and I am a DIY person. My question is, does this really works or is it a scam.
Thank you all for your help.

It is most likely a scam.
Assuming you need around 1kW of power on total, it will require a fairly large solar installation and batteries to keep that running all the time. Even as a DIY verison, this is not cheap.

When we are without electricity we have flashlights and LED lanterns.

We have found this one works best for us:

https://www.harborfreight.com/250-lumen-pop-up-lantern-64110.html

Of course, folks can always rely on candles though dear hubby hates those due to fire hazards so I get the ones in glass jars with lids.

There are designs here on the Permie site for portable solar plans.   The have a relatively small footprint, and I suspect they will produce enough electricity to meet your needs.

Maybe something like this would work if you are handy at DIY:

Don't you hate it when the power goes out and you need to charge batteries and run some lights?  Let's make a system to help out!

https://permies.com/wiki/140479/pep-electricity/Set-emergency-battery-system-charged

Here is a thread that might have some ideas.  I was looking for something simple:

https://permies.com/t/174546/simple-device-give-min-power

Jose, how much power does your oxygen concentrator use? And all the other things you need?
Figuring out how much energy you need would be the first step.

Your first step would be to get yourself a kill a watt meter to measure how much power your equipment uses over a 24 hour period. From there you could model a system to keep you going in case of outage.