Author Topic: Solar cell encapsulation - is hermetic sealing required?  (Read 268 times)

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Online OwO

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Solar cell encapsulation - is hermetic sealing required?
« on: October 08, 2019, 06:17:29 pm »
I've seen solar panels used outdoors (on rental bikes) that are resin encapsulated instead of glass, and in theory these aren't hermetically sealed (all resins pass moisture through), so what is the general consensus on whether this is a good idea?
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Offline Marco

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Re: Solar cell encapsulation - is hermetic sealing required?
« Reply #1 on: October 08, 2019, 06:21:57 pm »
3M think they can achieve a 25 year lifetime with polymer ultra barrier film ... they are the experts.
« Last Edit: October 08, 2019, 06:24:52 pm by Marco »
 

Offline ejeffrey

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Re: Solar cell encapsulation - is hermetic sealing required?
« Reply #2 on: October 10, 2019, 12:19:12 am »
It also really depends on the type of solar cell.  That 3M report is based on encapsulating thin film CIGS, CdTe, organic and dye based photovoltaics, the later of which are especially water sensitive.  Crystalline silicon is, I believe, considerably less sensitive to water than any of those technologies.
 

Offline splin

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Re: Solar cell encapsulation - is hermetic sealing required?
« Reply #3 on: October 11, 2019, 12:50:37 am »
I've seen solar paFYInels used outdoors (on rental bikes) that are resin encapsulated instead of glass, and in theory these aren't hermetically sealed (all resins pass moisture through), so what is the general consensus on whether this is a good idea?

What do you suppose the average lifetime of a typical rental bike is before it's stolen, damaged or destroyed (or at least the more delicate accessories such as solar panels)?

If you get more than 2 or 3 years out of a epoxy encapsulated panel you are doing OK but they can last a lot longer depending on their exposure to UV, temperature changes, rain,  frost etc.
 

Offline thm_w

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Re: Solar cell encapsulation - is hermetic sealing required?
« Reply #4 on: October 11, 2019, 01:15:46 am »
Cheap resin panels are garbage. The surface is easy to scuff and collect dirt, and very hard to clean easily (think if leaves or sap will fall on them). Could last from as little as 2 years to 5 years.
Big Clive had some good experience with adding a layer of rtv silicone on top of the cell but we are still talking ~1 year time span so far.
 


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