Hi William, I don't have a lot of experience with battery OCPD, but I did have a project where we used a Square D heavy duty safety switch to protect a negative grounded 600VDC battery string. All of the heavy duty switches are AC and DC rated (H363, H364, H365...).
For DC applications, go here: http://www.schneider-electric.us/sites/us/en/support/documents-downloads.page And search for bulletin number 3110DB0401. This shows that the switches are listed for DC use if 2 poles are wired in series. You are correct that a grounded conductor can never have OCPD unless the OCPD opens both the grounded and ungrounded wires at the same time (NEC 240.22). This could only be accomplished with a multi-pole circuit breaker and there aren't many around rated for 600VDC. Hope this helps. Regards, Jason M. Szrom, PE Engineering Supervisor Solar Energy Systems, LLC 718-389-1545 x13 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ray Walters Sent: Sunday, February 09, 2014 4:22 PM To: RE-wrenches Subject: Re: [RE-wrenches] Sunny Island Battery Disconnects Yes, they make a 3 pole class T fused disconnect. You could have 3 strings fused separately and then combined in a single pull disco, UL listed too. I even have one here, or I can provide their contact info. R.Ray Walters CTO, Solarray, Inc Nabcep Certified PV Installer, Licensed Master Electrician Solar Design Engineer 303 505-8760 On 2/8/2014 6:59 AM, Richard L Ratico wrote: > Ray, > Way back in 2002, you mentioned using Boltswitch products for battery string > fusing > immediately outside the battery box. Might one of these be a partial solution > for William? > > Dick Ratico > Solarwind Electric > > > --- You wrote: > I'm working on something similar. I think the Flex 1000 is the only > reasonable choice that can handle more than 2 of the large format DC > breakers. Midnite has the more expensive MNBCB -1000 Battery Combiner > box, but there just isn't enough documentation to figure out what it > can and can't do. > > R.Ray Walters > CTO, Solarray, Inc > Nabcep Certified PV Installer, > Licensed Master Electrician > Solar Design Engineer > 303 505-8760 > > On 2/7/2014 6:29 PM, [email protected] wrote: >> Friends: >> >> I am reworking an installation with 3 Sunny Island inverters. The >> battery leads have no disconnecting means or OCP. I have been looking >> for sensible hardware to provide this and I have found some options. >> I am interested in any input on these or ideas I have not discovered. >> >> 1.SMA BATFUSE. I am having trouble deciding which one is right for a >> 3 SI install. >> >> a.The B.003 appears to have fuse positions for the positive and the >> negative leads. I am fairly darn certain I don't want fuses in the >> negative leads of a negative bonded system, and although this is my >> first SI install, I am pretty sure this is negative bonded. Am I >> missing something here? >> >> b.The B.001 has only positions for two fuses as far as I can see from >> the manual. >> >> c.So it looks like neither will work for me. Does anyone have any >> experience and/or wisdom here? >> >> 2.Midnite Solar E-panels: >> >> a.The regular panel has DC and AC components. I want to control the >> AC elsewhere so I could order three slave units. The Midnite unit >> mounts right under the inverter but I would prefer to have the OCP >> closer to the batteries. >> >> 3.Outback: >> >> a.We could purchase an Outback FX1000 and install three breakers in it. >> >> 4.Breaker Size: >> >> a.I have started to read the manual but I have yet to find out what >> size breaker fuse is recommended. Have I just not found it yet? >> >> b.Also, I have not found a specification for battery cable size. Am I >> blind? >> >> Thanks in advance. I really appreciate the help I receive here. I >> try to give as well as receive. >> >> William >> > --- end of quote --- > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3462 / Virus Database: 3697/7073 - Release Date: 02/07/14 _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
