[RE-wrenches] solar panel warranty exclusion for salt water spray

[Marco Mangelsdorf via RE-wrenches]

Aloha all,
Does anyone know of a module manufacturer who does NOT have a warranty
exclusion when it comes to placing modules in the vicinity of the ocean and
salt water spray?
Mahalo,
marco
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Re: [RE-wrenches] Enphase ACM to rail mount plate

[James Rudolph via RE-wrenches]

Hey Mac,
If you have rails beneath the module wouldn't it be easier to mount an
inverter there with a bolt that fastens to rail?
William's solution looks great, but I thought to ask because this would be
cheaper and easier to wire.

Have a great day everyone  🌞

James B. Rudolph


Independent Energy

C-39784 ES #10816

NABCEP Certified PV Installer since 2009  #091209-155

C. 808.313.9701













On Thu, Feb 23, 2023 at 7:57 AM Mac Lewis via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> Hello Wrenches,
>
> We are in the middle of planning for a full solar panel replacement at a
> house with AC modules.  It was a Solaria 355 with an Enphase IQ7+.  Solaria
> is going to replace the modules with a standard module, not an AC module
> (MC4 cabling not an Q Cable to J-box).  This seems OK but the issue is the
> that microinverters don't have an integrated plate to mount to the existing
> rail.
>
> I've talked with Enphase and it doesn't appear that they are willing to
> sell us this mounting flange plate (or it could have been too unusual for
> this particular tech support contact to deal with).  Im sure I can fab up
> something, but curious if anyone has dealt with this?  Or has a good
> contact at enphase that might be able to help with this unusual request.
>
> Thanks in advance!
>
> --
>
>
>
> Mac Lewis
>
> *"Yo solo sé que no sé nada." -Sócrates*
> ___
> List sponsored by Redwood Alliance
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Re: [RE-wrenches] Enphase ACM to rail mount plate

[Jason Szumlanski via RE-wrenches]

Is this a warranty issue? If so, the manufacturer should be supplying a new
microinverter as well.

We had a little "experiment" with Qcell AC modules. A couple dozen
contracts and our guys hate them. The wire management is a nightmare for
the Q cable, and The module manufacturer didn't do us any favors with wire
management for the DC conductors. Not being able to make the array map
before the panels are laid is also a problem. We abandoned this product
pretty quickly.

This is definitely a downside of AC modules. You really have to replace it
with another AC module unless you are replacing the microinverter as well.
Post Hurricane Ian, with all of the modules damaged from winborne debris
here, I'm glad we don't have many AC modules out there. It's hard enough
finding a module that looks similar and has a similar size. Finding an AC
module with similar characteristics would be a nightmare.

Jason Szumlanski
Florida Solar Design Group





On Thu, Feb 23, 2023, 2:07 PM Mac Lewis via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> Its actually the alumium flange that is typically tapped into the
> microinverter plastic housing that I'm after (the part that is attached to
> the rail during installation).  In this case, the micros were in held a
> plastic bracket that was glued onto the module backsheet and so the
> standard mounting flange wasn't part of the set up.  This is certainly a
> disadvantage of an AC module...
>
> On Thu, Feb 23, 2023 at 11:13 AM William Miller via RE-wrenches <
> re-wrenches@lists.re-wrenches.org> wrote:
>
>> Mac:
>>
>>
>>
>> Maybe the SnapnRack MLPE flange kit is what you need?
>>
>>
>>
>>
>> https://snapnrack.com/wp-content/uploads/2019/07/SNR_MLPE-Frame-Attachment-Kit-Installation-Manual_v.1.1.pdf
>>
>>
>>
>>
>>
>> William
>>
>>
>>
>> Miller Solar
>>
>> 17395 Oak Road, Atascadero, CA 93422
>>
>> 805-438-5600
>>
>> www.millersolar.com
>>
>> CA Lic. 773985
>>
>>
>>
>>
>>
>> *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On
>> Behalf Of *Mac Lewis via RE-wrenches
>> *Sent:* Thursday, February 23, 2023 9:56 AM
>> *To:* RE-wrenches
>> *Cc:* Mac Lewis
>> *Subject:* [RE-wrenches] Enphase ACM to rail mount plate
>>
>>
>>
>> Hello Wrenches,
>>
>>
>>
>> We are in the middle of planning for a full solar panel replacement at a
>> house with AC modules.  It was a Solaria 355 with an Enphase IQ7+.  Solaria
>> is going to replace the modules with a standard module, not an AC module
>> (MC4 cabling not an Q Cable to J-box).  This seems OK but the issue is the
>> that microinverters don't have an integrated plate to mount to the existing
>> rail.
>>
>>
>>
>> I've talked with Enphase and it doesn't appear that they are willing to
>> sell us this mounting flange plate (or it could have been too unusual for
>> this particular tech support contact to deal with).  Im sure I can fab up
>> something, but curious if anyone has dealt with this?  Or has a good
>> contact at enphase that might be able to help with this unusual request.
>>
>>
>>
>> Thanks in advance!
>>
>>
>>
>> --
>>
>>
>>
>>
>>
>>
>>
>> Mac Lewis
>>
>> "Yo solo sé que no sé nada." *-Sócrates*
>> ___
>> List sponsored by Redwood Alliance
>>
>> Pay optional member dues here: http://re-wrenches.org
>>
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>>
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>>
>
> --
>
>
>
> Mac Lewis
>
> *"Yo solo sé que no sé nada." -Sócrates*
> ___
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Re: [RE-wrenches] Enphase ACM to rail mount plate

[Mac Lewis via RE-wrenches]

Its actually the alumium flange that is typically tapped into the
microinverter plastic housing that I'm after (the part that is attached to
the rail during installation).  In this case, the micros were in held a
plastic bracket that was glued onto the module backsheet and so the
standard mounting flange wasn't part of the set up.  This is certainly a
disadvantage of an AC module...

On Thu, Feb 23, 2023 at 11:13 AM William Miller via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> Mac:
>
>
>
> Maybe the SnapnRack MLPE flange kit is what you need?
>
>
>
>
> https://snapnrack.com/wp-content/uploads/2019/07/SNR_MLPE-Frame-Attachment-Kit-Installation-Manual_v.1.1.pdf
>
>
>
>
>
> William
>
>
>
> Miller Solar
>
> 17395 Oak Road, Atascadero, CA 93422
>
> 805-438-5600
>
> www.millersolar.com
>
> CA Lic. 773985
>
>
>
>
>
> *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On
> Behalf Of *Mac Lewis via RE-wrenches
> *Sent:* Thursday, February 23, 2023 9:56 AM
> *To:* RE-wrenches
> *Cc:* Mac Lewis
> *Subject:* [RE-wrenches] Enphase ACM to rail mount plate
>
>
>
> Hello Wrenches,
>
>
>
> We are in the middle of planning for a full solar panel replacement at a
> house with AC modules.  It was a Solaria 355 with an Enphase IQ7+.  Solaria
> is going to replace the modules with a standard module, not an AC module
> (MC4 cabling not an Q Cable to J-box).  This seems OK but the issue is the
> that microinverters don't have an integrated plate to mount to the existing
> rail.
>
>
>
> I've talked with Enphase and it doesn't appear that they are willing to
> sell us this mounting flange plate (or it could have been too unusual for
> this particular tech support contact to deal with).  Im sure I can fab up
> something, but curious if anyone has dealt with this?  Or has a good
> contact at enphase that might be able to help with this unusual request.
>
>
>
> Thanks in advance!
>
>
>
> --
>
>
>
>
>
>
>
> Mac Lewis
>
> "Yo solo sé que no sé nada." *-Sócrates*
> ___
> List sponsored by Redwood Alliance
>
> Pay optional member dues here: http://re-wrenches.org
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-- 



Mac Lewis

*"Yo solo sé que no sé nada." -Sócrates*
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Re: [RE-wrenches] Voltage Rise

[Dave Tedeyan via RE-wrenches]

The customer has already had the utility come out to take a look. He says
they had him turn off the solar, and then they measured 246V at the
transformer and then said it's not their problem. He was going to try to
get them back out to check the connections at the transformer and the
meter.
Also, that's a good suggestion to check each leg separately to see if maybe
there is only one line that has a bad connection.
Cheers,
Dave

On Thu, Feb 23, 2023 at 1:33 PM Jerry Shafer via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> Wrenches, Dave
> I have had this issue, first turn off everything, check static voltage,
> this will drive everything else. If the static is 240 L-L look at the
> utility side you might have small conductors, you might also have a
> transformer size issue bottlenecking the current.  Next turn loads more the
> better watch if there is a drop and how much. Now turn off everything and
> power up the solar again watch the voltage at the meter if it climbs up and
> close to limit it might be the feeders. It's all process of elimination.
> Lots of fun
>
>
> On Thu, Feb 23, 2023, 9:03 AM Dave Tedeyan via RE-wrenches <
> re-wrenches@lists.re-wrenches.org> wrote:
>
>> Hi All,
>>
>> I've got a customer who is having issues with high voltage at their
>> house. This first became an issue after installing 23.1kw of AC solar
>> output. They have some GREE heat pumps which have been having some
>> failures. The heat pump people are saying that the problem is that the
>> voltage is above 252V.
>>
>> The grid voltage was measured at 246V with the solar off, and 260V with
>> the solar cranking. The inverters are within 10' of the MSP where there is
>> a line side connection. Then there is 4/0 AL cable which has to go roughly
>> 175' before it reaches the transformer. At 246V and 92A, there should only
>> be about a 3.6V rise, or maybe 4V including the wire from the inverters to
>> the combiner to the MSP. Yet somehow there is about 14V of rise.
>>
>> The service entrance cable is buried. It is in conduit where it goes into
>> and out of the ground, but I have no idea whether there is conduit for most
>> of the run underground. Maybe there is a nick in the cable underground
>> which has caused corrosion? Does anyone have any ideas of how to find the
>> cause of the increased resistance? I should go back out there with an IR
>> camera to check the connections that I can at least get to in the house.
>>
>> I have suggested that they install a buck/boost transformer on the heat
>> pump circuits to bring down the voltage a little bit. But they are also
>> concerned about the high voltage causing issues with other electrical
>> appliances in the house. Does anyone have any anecdata to show whether
>> there are other hidden issues if the house is at 260V during times of high
>> solar production?
>>
>> Thanks!
>> -Dave
>>
>> --
>> [image: Logo] 
>> Dave Tedeyan, P.E.
>> Owner | Sungineer Solar
>> p: he | him | his
>> a: 1653 Slaterville Rd. | Ithaca, NY 14850
>> w: www.sungineersolar.com 
>> c: (607) 288-2898
>> ___
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-- 
[image: Logo] 
Dave Tedeyan, P.E.
Owner | Sungineer Solar
p: he | him | his
a: 1653 Slaterville Rd. | Ithaca, NY 14850
w: www.sungineersolar.com 
c: (607) 288-2898
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Re: [RE-wrenches] Voltage Rise

[Jerry Shafer via RE-wrenches]

Wrenches, Dave
I have had this issue, first turn off everything, check static voltage,
this will drive everything else. If the static is 240 L-L look at the
utility side you might have small conductors, you might also have a
transformer size issue bottlenecking the current.  Next turn loads more the
better watch if there is a drop and how much. Now turn off everything and
power up the solar again watch the voltage at the meter if it climbs up and
close to limit it might be the feeders. It's all process of elimination.
Lots of fun


On Thu, Feb 23, 2023, 9:03 AM Dave Tedeyan via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> Hi All,
>
> I've got a customer who is having issues with high voltage at their house.
> This first became an issue after installing 23.1kw of AC solar output. They
> have some GREE heat pumps which have been having some failures. The heat
> pump people are saying that the problem is that the voltage is above 252V.
>
> The grid voltage was measured at 246V with the solar off, and 260V with
> the solar cranking. The inverters are within 10' of the MSP where there is
> a line side connection. Then there is 4/0 AL cable which has to go roughly
> 175' before it reaches the transformer. At 246V and 92A, there should only
> be about a 3.6V rise, or maybe 4V including the wire from the inverters to
> the combiner to the MSP. Yet somehow there is about 14V of rise.
>
> The service entrance cable is buried. It is in conduit where it goes into
> and out of the ground, but I have no idea whether there is conduit for most
> of the run underground. Maybe there is a nick in the cable underground
> which has caused corrosion? Does anyone have any ideas of how to find the
> cause of the increased resistance? I should go back out there with an IR
> camera to check the connections that I can at least get to in the house.
>
> I have suggested that they install a buck/boost transformer on the heat
> pump circuits to bring down the voltage a little bit. But they are also
> concerned about the high voltage causing issues with other electrical
> appliances in the house. Does anyone have any anecdata to show whether
> there are other hidden issues if the house is at 260V during times of high
> solar production?
>
> Thanks!
> -Dave
>
> --
> [image: Logo] 
> Dave Tedeyan, P.E.
> Owner | Sungineer Solar
> p: he | him | his
> a: 1653 Slaterville Rd. | Ithaca, NY 14850
> w: www.sungineersolar.com 
> c: (607) 288-2898
> ___
> List sponsored by Redwood Alliance
>
> Pay optional member dues here: http://re-wrenches.org
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[RE-wrenches] US Dept of energy tax guidelines

[Dana Orzel via RE-wrenches]

 

https://www.energy.gov/sites/default/files/2022-11/Federal-Solar-Tax-Credits
-for-Businesses-11-22.pdf

 

Hey All - 

 

I just found this hope it's helpful to someone!

It turned around my level of information on commercial tax credits for solar
write-off & is a great doc to send to prospective clients & their CPA's. I
find that a lot of CPA's still are in the dark as to what to do with solar
tax incentives.

 

If nothing else it will possibly cure insomnia.

 

 

Dana Orzel  Great Solar Works, Inc. 

C - 208.721.7003d...@solarwork.com

Idaho Contractor - # 028765 Idaho PV # 028374

www.greatsolarworks.com 
www.solarwork.com   

"Responsible Technologies for Responsible People since 1988"  

 

P Please consider the environment before printing this email.

 

 

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Re: [RE-wrenches] [EXTERNAL] Voltage Rise

[White, Will via RE-wrenches]

I’ve run into a similar issue, and the problem was on the utilities side. They 
had shut down the local substation for repairs and were pumping power in from 
the next town over. To push the power that far, they increased the line 
voltage, which was causing issues with the PV inverter.

I’d suggest asking the utility to check the voltage at the transformer. They 
should be able to reduce it if it’s too high.

Thanks,
Will

From: RE-wrenches  On Behalf Of Dave 
Tedeyan via RE-wrenches
Sent: Thursday, February 23, 2023 12:02 PM
To: RE-wrenches 
Cc: Dave Tedeyan 
Subject: [EXTERNAL] [RE-wrenches] Voltage Rise


CAUTION: This email originated from outside of the organization. Do not click 
links or open attachments unless you recognize the sender and know the content 
is safe.


Hi All,

I've got a customer who is having issues with high voltage at their house. This 
first became an issue after installing 23.1kw of AC solar output. They have 
some GREE heat pumps which have been having some failures. The heat pump people 
are saying that the problem is that the voltage is above 252V.

The grid voltage was measured at 246V with the solar off, and 260V with the 
solar cranking. The inverters are within 10' of the MSP where there is a line 
side connection. Then there is 4/0 AL cable which has to go roughly 175' before 
it reaches the transformer. At 246V and 92A, there should only be about a 3.6V 
rise, or maybe 4V including the wire from the inverters to the combiner to the 
MSP. Yet somehow there is about 14V of rise.

The service entrance cable is buried. It is in conduit where it goes into and 
out of the ground, but I have no idea whether there is conduit for most of the 
run underground. Maybe there is a nick in the cable underground which has 
caused corrosion? Does anyone have any ideas of how to find the cause of the 
increased resistance? I should go back out there with an IR camera to check the 
connections that I can at least get to in the house.

I have suggested that they install a buck/boost transformer on the heat pump 
circuits to bring down the voltage a little bit. But they are also concerned 
about the high voltage causing issues with other electrical appliances in the 
house. Does anyone have any anecdata to show whether there are other hidden 
issues if the house is at 260V during times of high solar production?

Thanks!
-Dave

--
[Logo]
Dave Tedeyan, P.E.
Owner | Sungineer Solar
p: he | him | his
a: 1653 Slaterville Rd. | Ithaca, NY 14850
w: 
www.sungineersolar.com
c: (607) 288-2898



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Re: [RE-wrenches] Enphase ACM to rail mount plate

[William Miller via RE-wrenches]

Mac:



Maybe the SnapnRack MLPE flange kit is what you need?



https://snapnrack.com/wp-content/uploads/2019/07/SNR_MLPE-Frame-Attachment-Kit-Installation-Manual_v.1.1.pdf





William



Miller Solar

17395 Oak Road, Atascadero, CA 93422

805-438-5600

www.millersolar.com

CA Lic. 773985





*From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On
Behalf Of *Mac Lewis via RE-wrenches
*Sent:* Thursday, February 23, 2023 9:56 AM
*To:* RE-wrenches
*Cc:* Mac Lewis
*Subject:* [RE-wrenches] Enphase ACM to rail mount plate



Hello Wrenches,



We are in the middle of planning for a full solar panel replacement at a
house with AC modules.  It was a Solaria 355 with an Enphase IQ7+.  Solaria
is going to replace the modules with a standard module, not an AC module
(MC4 cabling not an Q Cable to J-box).  This seems OK but the issue is the
that microinverters don't have an integrated plate to mount to the existing
rail.



I've talked with Enphase and it doesn't appear that they are willing to
sell us this mounting flange plate (or it could have been too unusual for
this particular tech support contact to deal with).  Im sure I can fab up
something, but curious if anyone has dealt with this?  Or has a good
contact at enphase that might be able to help with this unusual request.



Thanks in advance!



-- 







Mac Lewis

"Yo solo sé que no sé nada." *-Sócrates*
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[RE-wrenches] Enphase ACM to rail mount plate

[Mac Lewis via RE-wrenches]

Hello Wrenches,

We are in the middle of planning for a full solar panel replacement at a
house with AC modules.  It was a Solaria 355 with an Enphase IQ7+.  Solaria
is going to replace the modules with a standard module, not an AC module
(MC4 cabling not an Q Cable to J-box).  This seems OK but the issue is the
that microinverters don't have an integrated plate to mount to the existing
rail.

I've talked with Enphase and it doesn't appear that they are willing to
sell us this mounting flange plate (or it could have been too unusual for
this particular tech support contact to deal with).  Im sure I can fab up
something, but curious if anyone has dealt with this?  Or has a good
contact at enphase that might be able to help with this unusual request.

Thanks in advance!

-- 



Mac Lewis

*"Yo solo sé que no sé nada." -Sócrates*
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Re: [RE-wrenches] Voltage Rise

[Mac Lewis via RE-wrenches]

Hi Dave,

Where is the utility voltage being measured?

I might suggest doing point to point voltage calculations based on the true
wire size and then verifying with measurement. It's great to use an IR
camera to look for hot spots.  Do this when the problem is the worst.  Is
it symmetric with L1 to Neutral and L2 to Neutral? Sounds like a utility
issue to me, perhaps an undersized transformer.

Good luck and please let us know what you find.

Thanks

On Thu, Feb 23, 2023 at 10:18 AM Jay via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> Hi Dave
> It might be that the utility transformer is where the extra voltage rise
> is coming from?
>
> Jay
>
>
>
> On Feb 23, 2023, at 10:03 AM, Dave Tedeyan via RE-wrenches <
> re-wrenches@lists.re-wrenches.org> wrote:
>
> 
> Hi All,
>
> I've got a customer who is having issues with high voltage at their house.
> This first became an issue after installing 23.1kw of AC solar output. They
> have some GREE heat pumps which have been having some failures. The heat
> pump people are saying that the problem is that the voltage is above 252V.
>
> The grid voltage was measured at 246V with the solar off, and 260V with
> the solar cranking. The inverters are within 10' of the MSP where there is
> a line side connection. Then there is 4/0 AL cable which has to go roughly
> 175' before it reaches the transformer. At 246V and 92A, there should only
> be about a 3.6V rise, or maybe 4V including the wire from the inverters to
> the combiner to the MSP. Yet somehow there is about 14V of rise.
>
> The service entrance cable is buried. It is in conduit where it goes into
> and out of the ground, but I have no idea whether there is conduit for most
> of the run underground. Maybe there is a nick in the cable underground
> which has caused corrosion? Does anyone have any ideas of how to find the
> cause of the increased resistance? I should go back out there with an IR
> camera to check the connections that I can at least get to in the house.
>
> I have suggested that they install a buck/boost transformer on the heat
> pump circuits to bring down the voltage a little bit. But they are also
> concerned about the high voltage causing issues with other electrical
> appliances in the house. Does anyone have any anecdata to show whether
> there are other hidden issues if the house is at 260V during times of high
> solar production?
>
> Thanks!
> -Dave
>
> --
> [image: Logo] 
> Dave Tedeyan, P.E.
> Owner | Sungineer Solar
> p: he | him | his
> a: 1653 Slaterville Rd. | Ithaca, NY 14850
> w: www.sungineersolar.com 
> c: (607) 288-2898
> ___
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-- 



Mac Lewis

*"Yo solo sé que no sé nada." -Sócrates*
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Re: [RE-wrenches] Voltage Rise

[Jay via RE-wrenches]

Hi DaveIt might be that the utility transformer is where the extra voltage rise is coming from?JayOn Feb 23, 2023, at 10:03 AM, Dave Tedeyan via RE-wrenches  wrote:Hi All,I've got a customer who is having issues with high voltage at their house. This first became an issue after installing 23.1kw of AC solar output. They have some GREE heat pumps which have been having some failures. The heat pump people are saying that the problem is that the voltage is above 252V. The grid voltage was measured at 246V with the solar off, and 260V with the solar cranking. The inverters are within 10' of the MSP where there is a line side connection. Then there is 4/0 AL cable which has to go roughly 175' before it reaches the transformer. At 246V and 92A, there should only be about a 3.6V rise, or maybe 4V including the wire from the inverters to the combiner to the MSP. Yet somehow there is about 14V of rise. The service entrance cable is buried. It is in conduit where it goes into and out of the ground, but I have no idea whether there is conduit for most of the run underground. Maybe there is a nick in the cable underground which has caused corrosion? Does anyone have any ideas of how to find the cause of the increased resistance? I should go back out there with an IR camera to check the connections that I can at least get to in the house. I have suggested that they install a buck/boost transformer on the heat pump circuits to bring down the voltage a little bit. But they are also concerned about the high voltage causing issues with other electrical appliances in the house. Does anyone have any anecdata to show whether there are other hidden issues if the house is at 260V during times of high solar production?Thanks!-Dave-- Dave Tedeyan, P.E.Owner | Sungineer Solarp: he | him | hisa: 1653 Slaterville Rd. | Ithaca, NY 14850w: www.sungineersolar.comc: (607) 288-2898
___List sponsored by Redwood AlliancePay optional member dues here: http://re-wrenches.orgList Address: RE-wrenches@lists.re-wrenches.orgChange listserver email address & settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.orgThere 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.orgList rules & etiquette:http://www.re-wrenches.org/etiquette.htmCheck out or update participant bios:http://www.members.re-wrenches.org___
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[RE-wrenches] Voltage Rise

[Dave Tedeyan via RE-wrenches]

Hi All,

I've got a customer who is having issues with high voltage at their house.
This first became an issue after installing 23.1kw of AC solar output. They
have some GREE heat pumps which have been having some failures. The heat
pump people are saying that the problem is that the voltage is above 252V.

The grid voltage was measured at 246V with the solar off, and 260V with the
solar cranking. The inverters are within 10' of the MSP where there is a
line side connection. Then there is 4/0 AL cable which has to go roughly
175' before it reaches the transformer. At 246V and 92A, there should only
be about a 3.6V rise, or maybe 4V including the wire from the inverters to
the combiner to the MSP. Yet somehow there is about 14V of rise.

The service entrance cable is buried. It is in conduit where it goes into
and out of the ground, but I have no idea whether there is conduit for most
of the run underground. Maybe there is a nick in the cable underground
which has caused corrosion? Does anyone have any ideas of how to find the
cause of the increased resistance? I should go back out there with an IR
camera to check the connections that I can at least get to in the house.

I have suggested that they install a buck/boost transformer on the heat
pump circuits to bring down the voltage a little bit. But they are also
concerned about the high voltage causing issues with other electrical
appliances in the house. Does anyone have any anecdata to show whether
there are other hidden issues if the house is at 260V during times of high
solar production?

Thanks!
-Dave

-- 
[image: Logo] 
Dave Tedeyan, P.E.
Owner | Sungineer Solar
p: he | him | his
a: 1653 Slaterville Rd. | Ithaca, NY 14850
w: www.sungineersolar.com 
c: (607) 288-2898
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