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Author Topic: Solar panel earth bonding bolts?  (Read 1871 times)
bmouthrob
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« on: February 16, 2018, 01:40:43 PM »

Hi everyone!

I'm new here and have trawled what seems the whole internet (including this forum) and still can't find what I need! I have a set of REC260PE panels which I'm looking to bond to a Earth rod. They have beautiful holes with earth symbols next to them within the frames, yet I can't seem to find anywhere that sells the correct (split??) bolts for solar panels.

Has anyone else purchased any recently and if so, where from!?

Thanks
Rob.
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smegal
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« Reply #1 on: February 16, 2018, 02:26:38 PM »

See if you can find a UK supplier of these:
https://remonsolar.en.ec21.com/Bonding_Lugs_for_Solar_System--5044092_6886169.html

or

https://remonsolar.en.ec21.com/Bonding_Lugs_for_Solar_System--5044092_6886169.html
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Iain
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« Reply #2 on: February 16, 2018, 06:04:29 PM »

Hi
Any use?

https://www.ebay.co.uk/itm/Solar-Panel-Photovoltaic-Bolt-On-Coupling-Ground-Lug-Cable-Clamp-/192357031278


https://www.ebay.co.uk/itm/Solar-Panel-Photovoltaic-Bolt-On-Coupling-Earthing-Ground-Lug-Cable-Clamp-/192357031329

Iain
« Last Edit: February 16, 2018, 06:06:07 PM by Iain » Logged

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TheFairway
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« Reply #3 on: February 16, 2018, 06:15:35 PM »

Long time since my panels were installed but iirc that earth bonding wasn't suitable for all inverters or could cause more problems than it solves, IE in a lightning storm where rest of building is not also protected against strike.

Hopefully an expert can comment.
« Last Edit: February 16, 2018, 06:22:25 PM by TheFairway » Logged
TT
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« Reply #4 on: February 16, 2018, 10:45:46 PM »

Why would you connect them to an earth rod?
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Westie
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« Reply #5 on: February 16, 2018, 11:45:17 PM »

IIRC if you can touch them you have to earth the metal frames and metal mountings.  If they're up on a roof out of reach you don't have to.  If you have them on a roof but you can touch them through and open window you also have earth them.  The earth connection shouldn't affect inverter operation as the frames are not connected to DC. IIRC this is because most inverters are now transformerless so if a DC cable shorted to the framework there is a potential for an AC path to earth through the inverter.  On older inverters a transformer separated (isolated) the AC and DC sides so there was no path for AC to earth on the DC side.  There's a suggestion that earthing a roof mounted array makes it more liable to lightning strike, after all, that's how lightning conductors work!
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TT
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« Reply #6 on: February 17, 2018, 06:32:03 PM »

You had to earth metal window frames for a while and that daft idea stopped
Canít see the point in doing the same with pv frames
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Fionn
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« Reply #7 on: February 18, 2018, 11:46:30 AM »

Canít see the point in doing the same with pv frames
The main reason for earthing PV frames, is to guard against the frames becoming live due to a fault with the PV system itself or another piece of electrical equipment.
For example, if someone was working on the roof and a damaged extension lead made contact with the frames and someone subsequently touched it, they would get a shock.
Also if the panel itself failed and the frame somehow took on an elevated DC voltage, there would be shock potential - but only if the DC was ground referenced through design or a secondary fault.

Both scenarios are obviously pretty unlikely.


There's a suggestion that earthing a roof mounted array makes it more liable to lightning strike, after all, that's how lightning conductors work!
There is however no merit to that suggestion, you can't "attract" lightning and lightning protection systems only serve to mitigate the damaged caused if you do suffer a strike. There's a lightning damaged panel for sale on a popular auction site at the moment actually. Looks like the strike went right through the cells and the frame is undamaged!
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TT
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« Reply #8 on: February 18, 2018, 12:28:55 PM »

Well wouldnít you earth them from a conductor that is connected to the PV AC side rather than a conductor via an earth rod
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Fionn
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« Reply #9 on: February 18, 2018, 12:38:29 PM »

Yes, but ideally both.
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