SPD 2P DC Lightning Surge Protector Protective Low-voltage Arrester Device

[fabieville]

I want to purchase a SPD 2P DC Lightning Surge Protector Protective Low-voltage Arrester Device for my solar system but i am unsure as to which one to pick. I have (2) solar system. One system is using a mppt charge controller that can handle a max input of 500vdc running a 48v system and i am currently sending little bit over 200volts dc to its input from the panels and the other system is using a mppt that can handle max input of 150volt dc to it running a 24v system and i am currently sending around 70volts to it and in the future i might increase the input going to it to about 100 plus if i upgrade it to 48v. If i am to buy a SPD 2P DC Lightning Surge Protector Protective Low-voltage Arrester Device for each solar system which size should i buy for each. They have them in DC 500/800/1000 Volts as u can see in the link below:

https://www.aliexpress.com/item/4000...40037615%22%7D

I am thinking a 500VDC one would be ok for each of the system that i mention above?

[Whyguy]

I want to purchase a SPD 2P DC Lightning Surge Protector Protective Low-voltage Arrester Device for my solar system but i am unsure as to which one to pick.

Guidance for this in the US is sparse. I’ve been researching it recently and the best article on rooftop PV lightning surge protection I’ve found is https://www.lsp-international.com/li...ltaic-systems/ (the EU approach with their parts, naturally). There is US guidance for lightning bolt protection (NFPA 780) but it doesn’t go into surge protection devices (SPD) very far. The SPDs you’ve found don’t show ANY listing marks so they’re a crap shoot. Ideally you’d find some listed by UL or another US recognized certification. Unfortunately that doesn’t include the European CE mark, which excludes a lot of good options. Enphase recommends Dehn SPDs for their Australian installations (and are silent in their US publications) and some of these are UL listed for sale in the US. See https://www.dehn-usa.com/store/filte...roduct=P269011
I have microinverters and apparently no one makes SPDs for the DC inputs from the PV panel. So I’m still researching options.