Tue, 19 Dec 2023 08:19:51 +0000 http://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17219&Focus=292085#Comment_292085 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17219&Focus=292085#Comment_292085 Fri, 01 Oct 2021 18:53:39 +0100 revor http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17219&Focus=292093#Comment_292093 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17219&Focus=292093#Comment_292093 Fri, 01 Oct 2021 21:26:29 +0100 djh Posted By: revorI have only just learnt of it.Well, as of reading your post, I've only just learned of it too. Fascinating. Seems like it might be another case where microinverters can offer some benefit?]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17219&Focus=292100#Comment_292100 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17219&Focus=292100#Comment_292100 Sat, 02 Oct 2021 09:51:31 +0100 SteveZ
My ideal weather (for PV at least) day is bright sunshine in the morning, with a cloud bank moving in from the East in the afternoon - it makes a tremendous difference to the daily power figures on my mainly E-facing array. I have seen 2kW produced from the reflected sunshine on a cloudy afternoon, when the relevant roof should be in shadow.]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17219&Focus=292101#Comment_292101 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17219&Focus=292101#Comment_292101 Sat, 02 Oct 2021 11:05:41 +0100 Jeff B http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17219&Focus=292106#Comment_292106 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17219&Focus=292106#Comment_292106 Sat, 02 Oct 2021 14:12:29 +0100 Ed Davies
Another consideration is that when the panels have been shaded by cloud for a while they'll be a bit cooler so their initial generation when the clouds move away will be a little higher until they warm up.

I don't understand why revor's inverter is dropping out under these conditions, though. Normally inverters are designed to handle the case of panels producing more power than they're capable or configured to handle, up to a point. They should just throttle the output to whatever their limit is by running the panels off their maximum power point.

I'm not sure what grid-tied inverters do but I gather MPPT charge controllers (for batteries) normally do this by increasing the current and so dropping well below the maximum-power-point voltage. This commonly means that the limit on the amount of panels which can be connected is that the total short-circuit current of the panels should not exceed the nominal current of the controller.

I don't see what microinverters have to do with all of this as the reflection effect won't differ significantly between the panels.]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17219&Focus=292109#Comment_292109 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17219&Focus=292109#Comment_292109 Sat, 02 Oct 2021 15:55:42 +0100 djh Posted By: Ed DaviesI don't see what microinverters have to do with all of this as the reflection effect won't differ significantly between the panels.The cloud cover and any related effects affect individual panels, and so with microinverters only individual panels are affected. With strings of panels on an inverter, the whole string is affected by any effects on just one panel, resulting in a greater disturbance to the output. Or at least that's what I understand.]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17219&Focus=292111#Comment_292111 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17219&Focus=292111#Comment_292111 Sat, 02 Oct 2021 16:48:31 +0100 Ed Davies Posted By: djhThe cloud cover and any related effects affect individual panels…But, unless the array is much more spread out than a typical domestic installation, the panels will all be affected essentially the same way. Clouds just aren't that sharp edged and area for reflections will be even more spread out. It's nearer objects casting shadows that microinverters help with.]]>