Rick: You’re OK leaving this random high voltage DC on the AC output?
William Miller Miller Solar.com 805-438-5600 www.millersolar.com On Wed, Oct 16, 2024 at 6:09 PM [email protected] < [email protected]> wrote: > Confirmed! Reading the same points on a different inverter yielded the > same results. At a different site, I measured -188.8VDC to ground on both > L1 and L2. > > My suspicion is that there’s leakage current via the H-bridge output. Just > a thought. > > Case closed, thanks. > > Rick Brown > Solshine Energy > Solar Electric Contracting Services > www.solshineenergy.com > Roanoke, VA > Office: 540.235.3095 > Mobile: 540.808.9502 > > CONFIDENTIALITY NOTICE -- This email is intended only for the person(s) > named in > > the message header. Unless otherwise indicated, it contains information > that is > > confidential, privileged and/or exempt from disclosure under applicable > law. If you have > > received this message in error, please notify the sender of the error and > delete the > > message. Thank you. > > > On Oct 16, 2024, at 3:49 PM, [email protected] wrote: > > Sorry I wasn’t clear. There’s no PV tied directly to the Sol-Ark however > the Sunny Boy has 5.52 kW of PV. Again the SB is AC coupled to the Sol-Ark > via its Load input/output. > > I can assure you that the DC is not coming from an external source. There > are no faults at either inverter (measured or indicated by the > inverter(s)). Both systems are operating normally. > > I’ll be looking at another site to verify whether these readings are > consistent or an anomaly. > > Thanks, > Rick > > On Oct 15, 2024, at 3:49 PM, William Miller via RE-wrenches < > [email protected]> wrote: > > Rick: > > > Two questions: > > > 1. If you don’t have PV on this system, what are those glassy, flat > things on the roof wired to the DC inputs of your Sunny Boy? > > > 2. Think to yourself: What component(s) on this project could possibly > produce high voltage DC? > > > I think the answer to both questions is… PV panels. I highly suspect you > have a PV ground fault. Proceed with caution. > > > On the Sunny Boy I would check the DC voltage between L1 and ground, > between L2 and ground and between neutral and ground. Do this in the > operational configuration that is producing the DC voltage on the Gen > inputs. > > > While you are at it, check DC voltages between the Sunny Boy DC inputs to > ground and between the Sunny Boy Chassis and ground. > > > Check your GEC, GEC bonding conductor and all of the system EGCs. > > > I would also check the GFDI fuse on the Sunny Boy. > > > William Miller > > > Miller Solar > 17395 Oak Road, Atascadero, CA 93422 > 805-438-5600 > www.millersolar.com > CA Lic. 773985 > > > > > *From:* [email protected] [mailto:[email protected]] > *Sent:* Tuesday, October 15, 2024 12:03 PM > *To:* [email protected]; RE-wrenches > *Subject:* Re: [RE-wrenches] Sol-Ark Gen Input > > > William, > > > There’s no PV on this system. It’s AC coupled to an SMA SB5.0. > > > As a test, we turned off the Grid input, Load output, and turned off the > battery breaker. As expected, the high voltage DC eventually bled to 0V. > Turning things on in this order: Battery, Grid, then Load resulted in the > high voltage appearing once the Grid relay kicked on. Actually, the high > voltage ramped up slowly once the Grid relay turned on. > > > We’ve been installing these for years and have never seen this. Then > again, we’ve never measured that point. > > > On Oct 15, 2024, at 2:32 PM, William Miller via RE-wrenches < > [email protected]> wrote: > > > Rick: > > > If I had to guess I’d say you have a PV wiring fault. The PV positive may > be shorted to ground. > This would make the inverter chassis negative in relation to ground. > > > The logic I use is to ask what is the likely source of DC at 195 volts? > It is most likely the PV circuits, wouldn’t you say? > > > If the DC Fault is not eternal then it must be internal to the inverter. > This could be a dangerous situation. I would proceed with caution. > > > Try completely isolating the PV from the inverter as a start. > > > Good luck. > > > William Miller > > > Miller Solar > 17395 Oak Road, Atascadero, CA 93422 > 805-438-5600 > www.millersolar.com > CA Lic. 773985 > > > > > *From:* RE-wrenches [mailto:[email protected]] *On > Behalf Of *rick--- via RE-wrenches > *Sent:* Tuesday, October 15, 2024 11:09 AM > *To:* RE-wrenches > *Cc:* [email protected] > *Subject:* [RE-wrenches] Sol-Ark Gen Input > > > Back on the Sol-Ark topic again. We have a customer whose 12kW is > measuring -195VDC to ground from L1 and L2 with the Gen breaker open. L1 to > L2 = 0V. I know the Gen input can be configured as an output, but reading a > high DC voltage to ground is concerning. The generator has never been run. > System is operating normally. > > > Anyone have a Sol-Ark accessible that could verify what they’re reading? > > > Thanks in advance. > > > Rick Brown > Solshine Energy > Solar Electric Contracting Services > www.solshineenergy.com > Roanoke, VA > Office: 540.235.3095 > Mobile: 540.808.9502 > > CONFIDENTIALITY NOTICE -- This email is intended only for the person(s) > named in > > the message header. Unless otherwise indicated, it contains information > that is > > confidential, privileged and/or exempt from disclosure under applicable > law. If you have > > received this message in error, please notify the sender of the error and > delete the > > message. Thank you. > > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > 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 > > > rick brown > SolShine Energy Alternatives, LLC > Electrical & Solar Contracting Services > www.SolShineEnergy.com <http://www.solshineenergy.com/> > Roanoke, VA > Office: 540.235.3095 > Mobile: 540.808.9502 > > VA Class A Contractor Lic# 2705147660 > VA Master Electrician Lic# 2710062762 > VA Alternative Energy Systems Installer > NABCEP Certified PV Installation Professional 110112-21 > > CONFIDENTIALITY NOTICE -- This email is intended only for the person(s) > named in > the message header. Unless otherwise indicated, it contains information > that is > confidential, privileged and/or exempt from disclosure under applicable > law. If you have > received this message in error, please notify the sender of the error and > delete the > message. Thank you.” > > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > 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 > > > rick brown > SolShine Energy Alternatives, LLC > Electrical & Solar Contracting Services > www.SolShineEnergy.com > Roanoke, VA > Office: 540.235.3095 > Mobile: 540.808.9502 > > VA Class A Contractor Lic# 2705147660 > VA Master Electrician Lic# 2710062762 > VA Alternative Energy Systems Installer > NABCEP Certified PV Installation Professional 110112-21 > > CONFIDENTIALITY NOTICE -- This email is intended only for the person(s) > named in > the message header. Unless otherwise indicated, it contains information > that is > confidential, privileged and/or exempt from disclosure under applicable > law. If you have > received this message in error, please notify the sender of the error and > delete the > message. Thank you.” > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > 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 > >
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