That is a potential solution, but if SMA is recommending load shedding contactors, shouldn't they supply a device or kit to implement this? Or at least specify products or at a bare minimum provide better documentation on how and why to implement it.
I still don't understand why it's recommended with Battery Protection Mode providing essentially the same function, unless you are trying to shed a subset of loads. Jason On Fri, Jan 22, 2021, 3:24 PM <[email protected]> wrote: > Use series resistors around the coil. > --- > > > > On 2021-01-21 13:59, Jason Szumlanski wrote: > > I just learned from the manufacturer that the mercury displacement relay's > coil is rated for 43.2 to 52.80V. Obviously, the battery voltage can exceed > 52.8 pretty significantly. Does the Sunny Island regulate the output > voltage on this relay to 48V or is the actual battery voltage passed > through on this terminal? > > The more I read about this load shedding strategy, the more it seems > overly complicated. It's also another thing to fail. If the N.O. contactor > coil fails, the loads to the house are going to lose power. That's not good > for a remote installation. I guess you have to weigh battery protection > with how critical the loads are. > > I'm wondering why the internal Battery Preservation Mode isn't sufficient > enough. What's the purpose of load shedding if the BPM does effectively the > same thing. I can see perhaps shedding some parts of the load and that is a > nice feature, but to protect the batteries, why isn't BPM enough? > > Jason > > > > On Tue, Jan 19, 2021 at 8:48 PM Mac Lewis <[email protected]> wrote: > > Hi Jason, > > I have done this with mercury displacement relays: > > https://www.mdius.com/mercury-relays/two-pole-relays-contactors/two-pole-100-amp > <https://mailtrack.io/trace/link/507c3cd242097f112c86a155d1e20d50857a422b?url=https%3A%2F%2Fwww.mdius.com%2Fmercury-relays%2Ftwo-pole-relays-contactors%2Ftwo-pole-100-amp&userId=1613865&signature=1f785f791758ce12> > > They do have a 100A 2P 48V coil relay. They seem to work perfectly. > > Good luck > > On Tue, Jan 19, 2021 at 2:51 PM Jason Szumlanski < > [email protected]> wrote: > > Does anyone know where I can get a load shedding contactor described in > SMA documentation for use with a multi-function relay in a Sunny Island? > > Thanks, > > Jason Szumlanski > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > <https://mailtrack.io/trace/link/17da3db56895ddc360fdc714312bb15c810b3d9c?url=http%3A%2F%2Flists.re-wrenches.org%2Foptions.cgi%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=c48369ecaf4e553d> > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > <https://mailtrack.io/trace/link/194df01af7007a27cee95e424186cee92dfb90aa?url=https%3A%2F%2Fwww.mail-archive.com%2Fre-wrenches%40lists.re-wrenches.org%2F&userId=1613865&signature=b359cf98f4845669> > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > <https://mailtrack.io/trace/link/a90c679cc6b08e0d8f9d077b1a0286cf0ac4450b?url=http%3A%2F%2Flists.re-wrenches.org%2Fpipermail%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=c436e3437bcfefb9> > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > <https://mailtrack.io/trace/link/6cad44ddc698382911f831e8f1c1dac0a8bcc288?url=http%3A%2F%2Fwww.re-wrenches.org%2Fetiquette.htm&userId=1613865&signature=4f7688074d106a23> > > Check out or update participant bios: > http://www.members.re-wrenches.org > <https://mailtrack.io/trace/link/46eb9172fba39b9b7cf250fe1773ec71c148de8a?url=http%3A%2F%2Fwww.members.re-wrenches.org&userId=1613865&signature=a916ce63ec434074> > > > > -- > > > > Mac Lewis > > "Yo solo sé que no sé nada." -Sócrates > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > <https://mailtrack.io/trace/link/709f6cb68c9bbc03071cb9842f0296828f708159?url=http%3A%2F%2Flists.re-wrenches.org%2Foptions.cgi%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=fbe2717c33dde0b9> > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > <https://mailtrack.io/trace/link/f2fb60bbff6e61e6d195e34d56d723dd6f26ad63?url=https%3A%2F%2Fwww.mail-archive.com%2Fre-wrenches%40lists.re-wrenches.org%2F&userId=1613865&signature=f68a2f06bcc591b8> > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > <https://mailtrack.io/trace/link/3147a7eacfc37ebda032d9848afdc4f2325e2fd7?url=http%3A%2F%2Flists.re-wrenches.org%2Fpipermail%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=0be6d941cf767375> > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > <https://mailtrack.io/trace/link/70fcc571777b9499feea16489030706bbcdc3569?url=http%3A%2F%2Fwww.re-wrenches.org%2Fetiquette.htm&userId=1613865&signature=3e11754cd74c5658> > > Check out or update participant bios: > http://www.members.re-wrenches.org > <https://mailtrack.io/trace/link/b701fd0e223b4ee024479d318e2335d0e5f7ad0a?url=http%3A%2F%2Fwww.members.re-wrenches.org&userId=1613865&signature=566dc63b61cef07d> > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
_______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/[email protected]/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
