Fri, 06 Mar 2026 20:53:27 +0000 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8769&Focus=144467#Comment_144467 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8769&Focus=144467#Comment_144467 Sat, 28 Apr 2012 22:41:07 +0100 GBP-Keith
I have another theoretical / technical question though that someone may be able to answer and help save me some time. Does anyone think that the signal from the relay switch could be sent down a cable some distance to switch the contactor remotely? Let's say 50 metres of cable?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8769&Focus=144469#Comment_144469 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8769&Focus=144469#Comment_144469 Sat, 28 Apr 2012 22:57:50 +0100 SteamyTea Find an online cable volt drop calculator and plug in the relevant numbers and see what comes out.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8769&Focus=144479#Comment_144479 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8769&Focus=144479#Comment_144479 Sun, 29 Apr 2012 08:12:30 +0100 Seret
PS: I did start another thread for all the philosophising yesterday ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8769&Focus=144481#Comment_144481 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8769&Focus=144481#Comment_144481 Sun, 29 Apr 2012 08:36:13 +0100 SteamyTea http://asiaexport.rs-online.com/web/c/automation-control-gear/contactors/contactors/?sra=p
not sure how your PV is wired but you can easily get one that would cover the total peak output.
The thing to keep an eye on is the coil voltage (230V AC) and if the contactor is normally open or normally closed. You want normally open (NO)

And use this volt drop calculator
http://www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html

So if you want to have the contactor 50m from your inverter relay (and I have chosen a ridiculous installation method as a worse case scenario) and assumed that the load is 10W (quite hefty for a contactor) and using 1mm2 twin and earth.
You will get a volt drop of 0.042V at 230V.

So really nothing to worry about apart from safety.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8769&Focus=144632#Comment_144632 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8769&Focus=144632#Comment_144632 Tue, 01 May 2012 19:30:14 +0100 GBP-Keith
Has anyone used this particular contactor with the SMA inverters with success? If so I would love to know.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8769&Focus=144639#Comment_144639 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8769&Focus=144639#Comment_144639 Tue, 01 May 2012 20:13:21 +0100 Gavin_A