Step 4: Pre-wire the solar cells

In the yard lights they use one solar cell for one battery. In the bike lights there are two batteries in series. There are two bike lights. So, I use two pairs of two solar cells in series to charge the four batteries in the two bike lights.
My solar cells have their terminals on the back side, so I needed to wire them before gluing them down. Decide how you will lay out the solar cells on the helmet and wire two pairs where a solar cell "+" is connected to a solar cell "-". Also attach wires to the lone "+" and "-" terminals.

I forgot to take a picture of the back side of the solar cells before mounting them, but it's pretty straight forward.
What helmet did you start with?
It's made by Bell. I don't know which model it is. I don't think it should matter too much.
Is this a safe helmet I ask? Those added modifications stick out, and in the case of ,hopefully unlikely, accident or even hitting a tree with your helmet, it will get caught causing your head to twist? The primary purpose of any helmet is to protect the wearer from shocks and reduce the possible injury and any modification added into helmets may compromise these.
Interesting thought. To be honest, I have wondered that about helmets <strong>themself</strong> in the past. A head is relatively smooth, but here you string something around your neck that adds another 5cm of lever/hook for anything to catch on to. <br/>I am not even totally convinced that wearing a helmet is worth it. Analyzing the risk of me falling of my bike and hurting my head, I think that there are many daily hazards that are riskier where no one suggests I should wear a helmet. Take climbing stairs, or worse, having a shower. But I digress :-)<br/>As for the modifications, I did not change the structure of the helmet at all, and I doubt that double-sided mounting tape would even stay put if someone fell on it. For the concern of any of the attachments acting as a &quot;point&quot; to help penetration by concentrating the impact, I would hope that the helmet could handle that; if not, it might not be worth wearing in the first place. <br/>To me, having the helmet make me more visible in traffic makes it a bit more worthwhile to wear it at all.<br/>Maybe between calebjc's helmet (I see he got a similar comment) and my helmet, someone will pick this up and produce it commercially with nothing sticking out. :-)<br/>
Congrats! Glad I could help inspire.
I can't believe I never thought of stealing the solar panels from lawn lights. I also like how you executed the strap switch. Not that I am biased or anything. Congrats on the prize!

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Bio: I like to make stuff and to make things work my way.
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