An update on this “issue”. Sol-Ark Tech Support said that the high voltage DC is normal and not a concern. I believe they said it was a “static” voltage. They didn’t really provide an answer as to why it’s present. But I stick to my hypothesis that the source is the H-Bridge drive circuitry.
William, to your point, I’m not thrilled that there’s a DC voltage on the AC output. But given that these units have been in operation for years without issue related to this input/output I’m not too worried. Thanks everyone! > On Oct 16, 2024, at 11:09 PM, William Miller <will...@millersolar.com> wrote: > > 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 <http://www.millersolar.com/> > > > On Wed, Oct 16, 2024 at 6:09 PM r...@solshineenergy.com > <mailto:r...@solshineenergy.com> <r...@solshineenergy.com > <mailto:r...@solshineenergy.com>> 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 <http://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, r...@solshineenergy.com >>> <mailto:r...@solshineenergy.com> 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 >>>> <re-wrenches@lists.re-wrenches.org >>>> <mailto:re-wrenches@lists.re-wrenches.org>> 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 <http://www.millersolar.com/> >>>> CA Lic. 773985 >>>> >>>> >>>> From: r...@solshineenergy.com <mailto:r...@solshineenergy.com> >>>> [mailto:r...@solshineenergy.com <mailto:r...@solshineenergy.com>] >>>> Sent: Tuesday, October 15, 2024 12:03 PM >>>> To: will...@millersolar.com <mailto:will...@millersolar.com>; 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 >>>> <re-wrenches@lists.re-wrenches.org >>>> <mailto:re-wrenches@lists.re-wrenches.org>> 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 <http://www.millersolar.com/> >>>> CA Lic. 773985 >>>> >>>> >>>> From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org >>>> <mailto:re-wrenches-boun...@lists.re-wrenches.org>] On Behalf Of rick--- >>>> via RE-wrenches >>>> Sent: Tuesday, October 15, 2024 11:09 AM >>>> To: RE-wrenches >>>> Cc: r...@solshineenergy.com <mailto:r...@solshineenergy.com> >>>> 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 <http://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 >>>> <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 >>>> >>>> There are two list archives for searching. When one doesn't work, try the >>>> other: >>>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >>>> 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 <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 >>>> <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 >>>> >>>> There are two list archives for searching. When one doesn't work, try the >>>> other: >>>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >>>> 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 <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 >>> <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 >>> >>> There are two list archives for searching. When one doesn't work, try the >>> other: >>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >>> 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 <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. 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