This is a hollywood meme.
The reality is that aggressive looters/warlords will be very quickly disposed of and the remaining ones will fall in line and become semi-official protective militia forces, who will labor alongside farmers in small communities if they don't want to starve.
Food scarcity will be a much bigger issue that some nutcase trying to loot my solar panels.
Which is to say, normal people really don't like shooting each other, and they REALLY don't like being shot at, so most normal folks would eliminate the threat of crazy warlords first, then form some kind of organized militia group to repel small groups of raiders/thieves.
Any large group of raiders would very quickly fall victim to its own internal politics and lack of resources, because they don't produce anything. You can't have a group that's 100% raiders.
It's just not going to look like Mad Max, ever. Sorry to disappoint.
A target for what? People to come charge their phone at your house?
Why would you be a target if 50%+ of population have solar setups?