What about Midnight SPDs? Todd On February 7, 2022 7:37:04 PM "Glenn Burt" <glenn.b...@glbcc.com> wrote: I am not seeing how ferrites can stop EMP. The frequencies involved will affect diode junction level electronics. Ferrites may lessen the induced surge picked up by the conductors between the array and the inverter/charge controller, but unless the electronics are hardened too, I don’t believe it. Glenn From: RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> On Behalf Of Maverick Brown Sent: Monday, February 07, 2022 12:52 PM To: RE-wrenches <re-wrenches@lists.re-wrenches.org> Subject: Re: [RE-wrenches] Ferrites for EMP/solar flare protection? Hans, Here is a split ferrite kit (various sizes) from [ Mouser.com ]( http://Mouser.com ): [ https://www.mouser.com/ProductDetail/Laird-Performance-Materials/K-404-EMI-A-LG?qs=GedFDFLaBXEg9IWU3Su8DQ%3D%3D ]( https://www.mouser.com/ProductDetail/Laird-Performance-Materials/K-404-EMI-A-LG?qs=GedFDFLaBXEg9IWU3Su8DQ== ) Sol-Ark makes an EMP hardened inverter and that kit comes with ferrite cores for each solar panel. Both normal and EMP version come with ferrite cores for the battery cables, Schnieder 600V solar charge controllers comes with cores and older inverters also came with cores. so, it seems cores are good even for regular systems, such as to combat back EMF from larger motor loads / inductive loads. So, the bottom line is that is helpful to block line surges by using ferrite cores to suppress voltage spikes & surges. And like lightning, you can do the best that you can do and too many parameters can guarantee anything. I going to investigate further and make kits for my own customers. Good luck! Maverick Maverick Brown Off-Grid Solar Commander since 2006 Maverick Solar Enterprises, Inc. • Solar Commander Remote Power • SunFlow Systems Cathodic Protection [ maver...@mavericksolar.com ]( mailto:maver...@mavericksolar.com ) 512-460-9825 On Feb 7, 2022, at 11:24 AM, Hans Frederickson <[ h...@fredelectric.com ]( mailto:h...@fredelectric.com )> wrote: Wrenches, One of our grid-tied solar + storage customers with a SolarEdge StorEdge / LG Chem RESU10H system found some information online about protecting solar systems from an EMP: [ Solar Power Ferrite Bundle – Practical Disaster Preparedness for the Family (disasterpreparer.com) ]( https://disasterpreparer.com/product/solar-ferrite-bundle/ ) Our customer is asking for our recommendation on this. We have used Ferrites for filtering out inverter noise but I’m not familiar with the idea of using them for protection from EMPs. Does anyone on this group specify or recommend these sorts of products for that purpose? Is there any historical evidence of EMPs being a threat to solar systems? Thanks, -Hans Hans Frederickson, President <image001.png> [ www.cascadiasolar.com » ]( http://cascadiasolar.com/ ) _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: [ http://re-wrenches.org ]( http://re-wrenches.org/ ) List Address: [ RE-wrenches@lists.re-wrenches.org ]( mailto:RE-wrenches@lists.re-wrenches.org ) Change listserver email address & settings: [ http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org ]( http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org ) There are two list archives for searching. 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