Yes, that’s my expectation. The output is at such a high impedance that as soon as you put any load on it, it would drop to 0.
> On Oct 28, 2024, at 9:49 AM, Jay via RE-wrenches > <re-wrenches@lists.re-wrenches.org> wrote: > > It would be interesting to see if there is power there. Like put a low > wattage 120v incandescent light bulb on it. > > If it was static wouldn’t the meter drain the volts? > > Jay > >> On Oct 28, 2024, at 7:31 AM, rick--- via RE-wrenches >> <re-wrenches@lists.re-wrenches.org> wrote: >> >> 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. 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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 >> > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: 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 > 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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_______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: 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
