[RE-wrenches] Cleaning Modules

[Wayne Irwin]

I did a little case study on an array (10kw Sanyo) in which the upper half was washed with softened water only, and the lower half was/is washed with softened water and rainx solution.

The results of over a 12 year period have been zero difference in output between the two halves, but the upper half starts to show a soiling build up about 6 months earlier than the bottom.

Rainx had (possibly still does) a statement recommending against using the product to clean modules. With no explanation why.

I'm not necessarily recommending rainx, but that's my experience.

W
________________________________
From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> on behalf of Corey Shalanski <coresolar at gmail.com>
Sent: Sunday, August 16, 2020 7:43 PM
To: re-wrenches at lists.re-wrenches.org <re-wrenches at lists.re-wrenches.org>
Subject: [RE-wrenches] Cleaning Modules

Greetings Wrenches,

I posed this question to the group a number of years ago and would like to ask it again, in case any new members have new ideas or any elders have adjusted their approach.

I am wondering if anyone can offer tried-and-true tips for cleaning modules: tools, materials, methods? I am particularly interested in cleaning solutions for large commercial flat-roof installations.

I have always had success using a mild soap solution to help loosen dirt/pollen, but I recently read an article specifically advising against this: https://www.solarpowerworldonline.com/2020/05/pro-tip-never-use-soap-to-clean-dirty-solar-panels/
Any reactions?

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
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