Well I have been out in a rain storm and the drops were not warm or ambient temperature. For that matter they seem pretty cold to me. Remember that some storms produce hail which is ice and not warm.
I mentioned the clouds because once they block the sun the panel temperatures come down from what they were before it rained.
The overall issue is not how to clean the panels but can cold water damage them due to a larger temperature change. Maybe they won't crack right away but will they degrade over time? Most panels are on a roof and out of site for close inspection. How would someone know the panels are slowly degrading unless they can see damage. Or in most cases on this forum when panels start to fail or not produce they look at the equipment or wiring first. Maybe they need to look at the panels and see if there is moisture inside the glass.
I agree that panels need to be cleaned but some type of caution should be taken when putting a cold solution on them when they are hot.
I mentioned the clouds because once they block the sun the panel temperatures come down from what they were before it rained.
The overall issue is not how to clean the panels but can cold water damage them due to a larger temperature change. Maybe they won't crack right away but will they degrade over time? Most panels are on a roof and out of site for close inspection. How would someone know the panels are slowly degrading unless they can see damage. Or in most cases on this forum when panels start to fail or not produce they look at the equipment or wiring first. Maybe they need to look at the panels and see if there is moisture inside the glass.
I agree that panels need to be cleaned but some type of caution should be taken when putting a cold solution on them when they are hot.
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