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Lightning protection location?
#1
Where should I locate lightning protection for my solar panels? Before the breaker, to the panels? Or behind them, to the inverter side?
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Maniac_Powerwall: 1x 14S100P 18650 LiIo, 6x 345W LG panels, MPP Solar PIP5048GK, Batrium Watchmon4 BMS
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#2
(02-28-2020, 05:53 PM)Maniac_Powerwall Wrote: Where should I locate lithning protection for my solar panels? Before the breaker, to the panels? Or behind them, to the inverter side?
A common place is at the combiner box / outside.    Panels ------>  combiner-box/quick-disconnect/lightning-arrestor (outside) ------> Charge Controller (usually inside)


There are 4 arrestors because there are 4 independent pv sub-arrays (e.g. 4 seperate + / - wires) feeding into the house from this combiner box. I always see them outside and I presume it because its better to deal with lighning surge outside where fire is less likely to burn anything up Smile

Maybe someone can give the actual recommendations on this.
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#3
I got some of these: https://www.ebay.de/itm/Uberspannungssch...SwZb9dwIbi

I think I will place them into my fuse box inside. But I understand why it could be good to place them into the Combiner box. But I don't plan to have one for now...

But so you got them before your breakers. That's what I think is the place to be. Any other suggstions/oppinions on that!?
My Powerwall Build Thread

Maniac_Powerwall: 1x 14S100P 18650 LiIo, 6x 345W LG panels, MPP Solar PIP5048GK, Batrium Watchmon4 BMS
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#4
You also need a good earth cable connected to the arresters.

The important thing with lightning is to bond all the cables (eg with arrestors, etc) to a common earth point to stop/calm voltage differential.
Eg lightning hits array, whole system gets voltage on it, Ethernet cable leaving towards house goes PC, PC > house ground
Ethernet cable gets voltage on it, damages gear at each end of the cable because house ground is different to shed system.
Running off solar, DIY & electronics fan :-)
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#5
We will ground the PV array and all the gear. But for now I need to find the right spot to install the lightning protection. Any idea?
My Powerwall Build Thread

Maniac_Powerwall: 1x 14S100P 18650 LiIo, 6x 345W LG panels, MPP Solar PIP5048GK, Batrium Watchmon4 BMS
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#6
Just found a installation manual that tells me to put them before and behind the breakers. I think I will install the one I got before the breakers. That makes more sense to me somehow...
My Powerwall Build Thread

Maniac_Powerwall: 1x 14S100P 18650 LiIo, 6x 345W LG panels, MPP Solar PIP5048GK, Batrium Watchmon4 BMS
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#7
I'd put one set on the side of the breaker towards the charge controller/battery, etc, thinking, easier to work on, close to the gear is better than on the roof (easier access & better protection).
Running off solar, DIY & electronics fan :-)
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#8
My thought is that a lightning would most likely pop the breaker and the protection is useless afterwards if placed behind the breaker to the gear.
My Powerwall Build Thread

Maniac_Powerwall: 1x 14S100P 18650 LiIo, 6x 345W LG panels, MPP Solar PIP5048GK, Batrium Watchmon4 BMS
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#9
(03-01-2020, 09:14 AM)Maniac_Powerwall Wrote: My thought is that a lightning would most likely pop the breaker and the protection is useless afterwards if placed behind the breaker to the gear.
I believe the idea is a lightning (or other) surge will 'fry' (melt) a breaker before it can trip and that's why you wire it upstream from the breaker.  

However, here's what I consider a 'legitimate' discussion by Midnite Solar on their SPD(s)  (its what I show in my picture above) and their different uses / recommended hookup - MidNite Solar - Introduction to the Surge Protection Device  https://youtu.be/-B64V_FZBFQ Checkout 6:18 into the youtube - talks about PV array -> Charge Controller specifically.
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#10
But it will be still available if the breaker is melt. I do understand why two of them would be better. But still think having only one on the panel side of the breaker is better, right?

BTW those midnite SPDs look really fancy :-)
My Powerwall Build Thread

Maniac_Powerwall: 1x 14S100P 18650 LiIo, 6x 345W LG panels, MPP Solar PIP5048GK, Batrium Watchmon4 BMS
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