Re: [RE-wrenches] MLSD module level shutdown

[Solar Energy Solutions]

Dear All,
I apologize for letting this conversation get a little stale before being able 
to comment further.
Before I reply, I would like to say I don't believe MLSD has anything to do 
with firefighter safety.  If being on dangerous roofs was really a concern, 
steep roofs, slate roofs, metal roof, wet metal or shake roofs and snow on 
roofs would get the same kind of scrutiny as solar on roofs.  I can only guess 
and think that some HUGE solar hating utility company devised this whole 
firefighter safety thing.  It is also my understanding none of the string 
inverter folk turned up to the code development meetings where MLSD was 
determined and you can guess who was.    But much of this is only rumor and the 
dark thoughts of a solar bozo.

I HATE the hassle and maintenance issues of MLSD.  I loved string inverters and 
hated to see them go.  So far as I can tell the US is the only place on planet 
Earth to make String inverters all but illegal.  This said... a picture is 
worth a thousand words.  All of the attached photos of systems had the wire 
management done very well.  If you look at the metal roof photo you can see a 
small hole in it from the arc.  I have many more photos of different squirrel 
damaged systems.  Ground Fault protection has saved the inverters, but not the 
roofs.

I don't really like the idea of squirrel guards.  It seems like I may be 
creating another problem down the road that I can't really imagine.  Debris 
build up could be an issue.  Rainwater could back up from a damn and get under 
shingles and into the cavity of the house.  For me the easiest thing that could 
be done is for some kind of a bittering agent to be part of the wires so that 
one little lick would send a critter looking for a better food source.
Your Friendly Neighborhood Solar Man,
https://www.dropbox.com/s/3g5c57nqke9x7b2/Fire%201.JPG?dl=0Fire 2.JPG

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 Andrew KoyaanisqatsiPresidentSolar Energy Solutions, Inc.
The BRIGHT CHOICE
Since 1987, helping you and your Portland neighbors
move towards an environmentally sustainable future.503-238-4502
www.SolarEnergyOregon.com  

 On Friday, January 29, 2021, 8:15:28 PM PST, Ray  
wrote:  
 
  
I totally agree; where else does the NEC allow loose single conductor cables to 
run unprotected? outdoors?  All because the module manus and industry in 
general has made no effort, zero, to accommodate any type of electrical 
industry standard K/Os for conduit, or TEK 90 (great stuff BTW).   If we hadn't 
gone this wacky direction, starting about 15 years ago, we probably wouldn't be 
having this conversation, because there would be much less reason for MLSD. 
 
 
I could see whips of TEK 90 that plugged into polarized 2 pole quick connects 
mounted integrally to a J box on the back of each module. 
 
 

 Ray Walters
Remote Solar
303 505-8760 On 1/29/21 8:10 PM, Hilton Dier wrote:
  
 There’s a buried-in-plain-sight issue here that has bugged me for years. 

In the bad old days we had to hard wire into J-boxes on the backs of modules. A 
pain, but it meant that, if necessary, we could install conduit from the module 
to the combiner box. Now we have convenient pigtails.

 However, we are stuck with #10 PV wire hanging under the module from the box 
to the nearest attachment point. There are all sorts of trays and wire 
management systems, but there’s always that one loop of wire hanging in the 
open. 

I know that the module industry has near zero margins as a commodity market. 
Perhaps one manufacturer could differentiate themselves by making a module with 
either 1) armored pigtails, or 2) provision for some kind of conduit starting 
at the J box.

I’m thinking of all the various back covers installers have to improvise on 
ground mounts. I’m thinking of squirrels and ice dams. 

Why can’t there be a module with the equivalent of Teck 90 cable on it?

Maybe I’m just being naive. 

Hilton 

Hilton Dier III
Renewable Energy Design
Missisquoi River Hydro LLC
 
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Re: [RE-wrenches] Trace DR inverter fan

[Tump]

Sounds like the thermistor is bad. Kris @ Tekris power 732 938-4996. To heck w/ 
the thermistor bring em a new inverter!
> On Feb 4, 2021, at 4:45 PM, Jerry Shafer  wrote:
> 
> I might consider taking a loaner inverter with you, l have had the SW and DR 
> inverters have calibration failures not just sensor failures, if you are 
> getting a boat ride, corrosion is a good possibility so again bring a loaner 
> OB 2524 or maybe he may want to buy it anyway.
> Jerry
> 
> On Thu, Feb 4, 2021, 12:13 PM Eric Smiley  > wrote:
> I have a client whose Trace DR 1524 inverter (yes, it's an old system) fan is 
> running constantly.
> I haven't been to the site (3 hour drive, 1 hour boat ride) but I am guessing 
> that it's a failure of a temperature sensor.
> Does anyone have experience with something like this?
> 
> Eric Smiley, MASc
> Project Manager, North Island
> 
> E:  e...@vecoop.ca 
> T:  1-888-386-0116 ext 702 (toll free)
> C:  250-703-6004
> W:  viridianenergy.ca 
>  
> RENEWABLE POWER NOW
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[RE-wrenches] Victron

[Dave Angelini Offgrid Solar]

Can you folks tell me if Victron is UL listed for a Grid application and
can it easily work split phased?  

Thank-you !  

Dave Angelini Offgrid
Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
[1]
e-mail offgridso...@sti.net [2]
text 209 813 0060
 

Links:
--
[1]
http://members.sti.net/offgridsolar/
[2] mailto:offgridso...@sti.net
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Re: [RE-wrenches] Trace DR inverter fan

[Jerry Shafer]

I might consider taking a loaner inverter with you, l have had the SW and
DR inverters have calibration failures not just sensor failures, if you are
getting a boat ride, corrosion is a good possibility so again bring a
loaner OB 2524 or maybe he may want to buy it anyway.
Jerry

On Thu, Feb 4, 2021, 12:13 PM Eric Smiley  wrote:

> I have a client whose Trace DR 1524 inverter (yes, it's an old system) fan
> is running constantly.
> I haven't been to the site (3 hour drive, 1 hour boat ride) but I am
> guessing that it's a failure of a temperature sensor.
> Does anyone have experience with something like this?
>
> Eric Smiley, MASc
>
> Project Manager, North Island
>
> E:  e...@vecoop.ca
>
> T:  1-888-386-0116 ext 702 (toll free)
>
> C:  250-703-6004
>
> W:  viridianenergy.ca 
>
> 
>
> RENEWABLE POWER NOW
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Re: [RE-wrenches] Load imbalance issues with SolArk?

[Jeremy Coxon]

This issue makes SolArk a non-starter (pun intended) for us.  I am not a bit 
interested in trying to resolve simple issues (like running a 120V table saw - 
come on!) that should be taken care of before a product is released for sale.  
Like a lot of places, it looks like net metering is pretty much going away here 
which means a lot more storage based systems down the road.  Based on what I’m 
reading lately from you guys, the manufacturers have a long long way to go to 
making these systems perform properly.  Most of our customers want whole house 
back up and they don’t want to manage loads.  We compete against a bunch of 
electricians that are hocking whole house gensets for a few grand, so why would 
anyone want a more complicated more expensive back up solution.

I for one do not want to place my customers in the position of being a test bed 
for these systems and I sure don’t want to deal with the legal/financial 
results of a non or semi functional system that isn’t properly engineered.  
We’ve done a decent amount of DC coupled lead acid off grid/gen and “off 
grid”/gen/net metered for the last 15 years without any problems - these 
systems are running well pumps, 5 ton AC units, full wood working shops, you 
name it.  Schneider, Outback, and Magnum have all been able to handle these 
loads without blinking. 

After reading glowing reviews about Solark on this forum, I had been seriously 
considering trying out SolArk on an upcoming large system - not now.  I don’t 
know, it just seems crazy to me to have to put in an autoformer on an 8kW, 
supposedly balanced, inverter.  I’ll think pass.  My days of providing free 
field tech support to solar manufacturers are over.   This industry is old 
enough and large enough now to put that paradigm to rest.

Best Regards,
Jeremy Coxon NABCEP # 091308-21
Vice President
MWBE Certified



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Re: [RE-wrenches] Tesla Powerwall

[Harry Mahon]

Jon – if you are installing in PG territory, the Sunny Boys (with CA Rule 21 
settings enabled) will have freq-watt enabled, so they will reduce power 
linearly when the PW begins to increase frequency in backup mode as well.

As Jerry mentioned, this has been a required function that must be enabled in 
all grid interactive PV inverters in the IOU territories of CA for a couple 
years now, so not unique to the Sunny Boy.  Not sure how the PW moves 
frequency, but Rule 21 inverters will be at 0 power at least by slightly above 
62Hz.  The ramp is percentage of nameplate not actual production when ramp 
starts, so can be at zero production at lower frequency.

PG required freq-watt: “When system frequency exceeds 60.036 Hz, the active 
power output produced by the Smart Inverter shall be reduced by 50% of real 
power nameplate rating per hertz (5% of real power nameplate rating reduction 
per 0.1 hertz)”
Page 196 of   
https://www.pge.com/tariffs/assets/pdf/tariffbook/ELEC_RULES_21.pdf

The Sunny Boy put into Offgrid mode has a linear power ramp of 100%/Hz starting 
at 61 Hz, so will be at zero by 62Hz as well.  This freq-watt is how the Sunny 
Island has been intelligently throttling Sunny Boys for many years.

Best –
Mike


From: RE-wrenches  On Behalf Of 
August Goers
Sent: Thursday, February 4, 2021 8:26 AM
To: RE-wrenches 
Subject: Re: [RE-wrenches] Tesla Powerwall

Hi Darryl -

Yea, you have a good point. We have recently used the SMA freq/watt curtailment 
feature on a bigger off grid system with SMA Tripower inverters and a Tesla 
Powerpack. We programmed a curve into the SMA inverters so that the Powerpack 
can throttle SMA PV production on a smooth curve, rather than just binary 
on/off. We've done this with Sunny Island based systems too. I don't know about 
the ability of the Powerwall to do this. It's a good question. It gets tricky 
trying to meet the utility-approved grid tied settings while optimizing offgrid 
settings, especially when AC coupling different inverter manufacturers. So, 
we've been leaving all of our Powerwall and PV systems in the normal ongrid 
mode. The only real downside is that when the grid is down, and PV is producing 
more than the battery needs, it will just turn off, wait, and then back on over 
and over, rather than throttle. It is nice to have it just throttle, but not 
really a big deal for most applications that are primarily grid tied. I have to 
think manufacturers are thinking about getting that freq/watt curtailment to 
work across different AC coupled applications. That would be cool. That is a 
potential benefit of a all-one-manufacturer AC-coupled solution such as 
Enphase's Encharge or SunPower's new SunVault system. However, I don't know 
they're implementing that feature either, yet.

August

On Thu, Feb 4, 2021 at 3:59 AM Darryl Thayer 
mailto:darylsol...@gmail.com>> wrote:
Here is my two cents worth.  the PW is "grid following" and so is the sunny boy 
when the grid is up.  When the grid fails the PW becomes grid forming, 
bi-directional, inverter charger with frequency shift to control charging.  The 
newer SBs will accept frequency shifts and be controlled.  So yes it should 
work, but I have not tried this, and someone with experience should answer.

On Thu, Feb 4, 2021 at 1:19 AM Jerry Shafer 
mailto:jerrysgarag...@gmail.com>> wrote:
Mr Hill
The PW is AC coupled so any inverter but the newer the better with Freq shift 
capable may take programming to work best.
Jerry

On Mon, Feb 1, 2021, 10:03 AM Jonathan Hill 
mailto:solar...@gmail.com>> wrote:
So it can be used with a Sunnyboy, correct? Have you ever installed one?
Jon Hill
Solar design engineer
530-559-3781
solar...@gmail.com



On Jan 31, 2021, at 4:11 PM, Jerry Shafer 
mailto:jerrysgarag...@gmail.com>> wrote:

Tesla is ac coupled  you need the tesla transfer switch and a sub panel, 
everything into and out of that. But its AC coupled so there is that too.
Jerry

On Sun, Jan 31, 2021, 3:18 PM Jonathan Hill 
mailto:solar...@gmail.com>> wrote:
Anyone have experience combining some Tesla Powerwalls with Sunnyboy inverters 
ro other string inverters?
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[RE-wrenches] Trace DR inverter fan

[Eric Smiley]

I have a client whose Trace DR 1524 inverter (yes, it's an old system) fan
is running constantly.
I haven't been to the site (3 hour drive, 1 hour boat ride) but I am
guessing that it's a failure of a temperature sensor.
Does anyone have experience with something like this?

Eric Smiley, MASc

Project Manager, North Island

E:  e...@vecoop.ca

T:  1-888-386-0116 ext 702 (toll free)

C:  250-703-6004

W:  viridianenergy.ca 



RENEWABLE POWER NOW
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Re: [RE-wrenches] Load imbalance issues with SolArk?

[Tuss, Lones]

Hi Jay
Hi Larry
The X240 is a 4000 watt transformer it is also available in the PSX-240
Both can be used as a step up, a step down or a balancing xfmr.

Below is a link to the manuals.
https://www.outbackpower.com/resources/documents/product-documentation/item/autotransformer-technical-documentation
 Balancing transformer is not required by the Radian or the FXR inverters.
I was used in the older FX series usually as a step up/balancing Xfmr.
In step up operation it allows a single inverter to be on and will provide a 
second ac voltage of the opposite phase. If 2 inverters L1 and L2 were present  
it would load balance which allowed the least used phase to contribute to the 
most used phase.

   It can still be used as step up with a single FXR inverter meaning a single 
unit and the X240 will provide two phases L1 and  L2 with 180 degrees of phase 
separation.  It will not work as a load balancing xfmr using the FXR inverter. 
With the FXR we lost the load balancing ability. What we gained was the ability 
to sell back in a multi inverter stacked system, the 7 modes available from the 
Radian and Selling with in a 3 phase 120/208 system up to a 9 inverters.
I hope this helps.
Take Care All





From: RE-wrenches  On Behalf Of Jay
Sent: Wednesday, February 3, 2021 4:45 PM
To: RE-wrenches 
Subject: Re: [RE-wrenches] Load imbalance issues with SolArk?

Hi Larry

I’m not so sure about that. The X-240 doesn’t work with the Radian or FXR 
versions. IE it won’t balance the loads so that the inverter sees a balance on 
L1/L2.

It did do this for the older FX versions.

Jay




On Feb 3, 2021, at 2:10 PM, 
la...@starlightsolar.com wrote:
Amos,

When using it in balancing mode, as seen in the attached image, the PSX will 
provide 120Vac from either leg and the inverter output should stay balanced. A 
240Vac circuit from the main panel goes to the PSX then to a sub panel and any 
240Vac loads stay on the main panel.


Larry Crutcher
Starlight Solar Power Systems




On Feb 3, 2021, at 1:49 PM, Amos Post 
mailto:integrityenergy...@gmail.com>> wrote:

We have had this issue with a recent installation.  It’s a new off-grid house 
build, and so not many loads to speak of yet, except mainly power tools.  The 
Solark 12K will not start any of: portable air compressor, table saw, and 
sometimes struggles with a miter saw, which are each 16amps or less at 120V, 
but I have measured close to 50amps start up for the air compressor and table 
saw.  The air compressor and table saw are 1.5HP each.  What helps is if the 
motors are warmed up, or putting another load on the other leg to balance the 
inverter’s output.

Was thinking we would install a couple of dedicated 120V outlets for 
“high-current” 120V loads with a PSX-240, stepping down the inverter's 240 to 
120.  My understanding is this will solve the issue for starting these loads, 
but not sure if we might run into issues with inbalance down the road...  Would 
be curious to know if there’s another way to balance all of the house loads 
using the PSX-240?..


   Amos Post
   Integrity Energy
  W 802.763.7023
   C 802.291.2188

ienergyVT.com

Facebook


On Feb 3, 2021, at 2:41 PM, 
la...@starlightsolar.com wrote:

If it turns out to be true, could you simply add the Outback PSX-240 to balance 
the loads?

Larry Crutcher
Starlight Solar Power Systems



On Feb 3, 2021, at 10:52 AM, Nick A Lucchese 
mailto:luccheseso...@me.com>> wrote:

Good morning Wrenches,

I’ve strongly been considering using the SolArk 12K unit for awhile but have 
heard from a few folks that there can be somewhat frequent issues with the 
inverter shutting down from line to line imbalance. As little as 1400 watts? I 
could see where these instances would be minimized with attention to detail on 
balancing all the loads but if’s as little as a delta of 1400 watts that might 
occur with something as innocent as a toaster oven. Seems like it would also be 
less of an issue in a grid back up or AC coupled scenario but for off grid I’d 
be bummed to be getting calls every couple weeks from an off grid client that 
trusted me to offer the right equipment.

How much of an issue is this? Is it getting exaggerated? Those that have NOT 
had this happening was it on a full time off grid site?

Has it happened less on sites using the "Limited to Home” mode? I have an 
upcoming project that was going to be setup with a couple Radians in HBX mode 
and my thought was perhaps it might be an ideal solution there but if the 
continuity of electrical service was going to be 

Re: [RE-wrenches] grid sell back time settings on Outback systems

[Jerry Shafer]

Wrenches, Kirpal
I use the grid connection in the mate, grid use, and set the inverter to
connect only at that time, its far from. Ideal but seems to do the job. I
have tried the HBX but its inverse to what l wanted it to do, we are
fortunate to have a Outback guy on this forum and he may chime in also
Jerry

On Thu, Feb 4, 2021, 8:22 AM Kirpal  wrote:

> Hi Folks
> We have a scenario where we would like to control when our system sells
> power back to the grid.  Basically, we only want to sell back while the sun
> is shining. We would like to stop selling based on programmed clock
> settings.  I know in HBX mode we can control when we buy from the grid,
> wondering if anyone knows how to control if and when we sell to the grid,
> separate from voltage set points.  In this situation we basically don't
> want to sell hydro power back at night.
> We can create our own relay controls to prevent if we need to, but hoping
> someone has a Mate controller based programming solution.  I can't seem to
> find it and at first glance Outback tech support didn't have an answer...It
> was a new tech support guy I spoke with and he was going to do some
> research and get back to me.
> 100 Thanks!
>
> Sunny Regards,
> Kirpal Khalsa
> Oregon LRT#25
> Oregon Solarworks LLC
> www.oregonsolarworks.com
> 541-299-0402
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Re: [RE-wrenches] grid sell back time settings on Outback systems

[Tuss, Lones]

Hello Kirpal
Hello Wrenches
This can be accomplished using the Mate3(s) and Flextime.
Flextime allows up to 3 modes in a 24 hour day.
Flextime uses a 24 hour clock to instruct a system to switch modes based on 
time.
A good knowledge of the modes and how they work is helpful.
Results may vary depending on solar vs loads.
Below is a picture of a system set up to achieve your request.
Adjust the times to suit your individual needs.
The setting below are as follows
1800 to 1830 Grid Tied and sell enabled
1830 to 0700 Grid Zero (no sell and no  charge from the grid)
0700 to 1800 Back Up (allowing the unit to pass through and charge)
 Again a good knowledge of how the modes function and the charging triggers 
(Re-Bulk and Re-Float) is helpful.
One of the advantages is this can be done via optics so fine tuning can be 
accomplished by
monitoring the system over time as it goes through the various sequences.


[cid:image002.jpg@01D6FADB.A76193A0]
I hope this helps.
Take Care All



From: RE-wrenches  On Behalf Of 
Kirpal
Sent: Thursday, February 4, 2021 8:22 AM
To: RE-wrenches 
Subject: [RE-wrenches] grid sell back time settings on Outback systems

Hi Folks
We have a scenario where we would like to control when our system sells power 
back to the grid.  Basically, we only want to sell back while the sun is 
shining. We would like to stop selling based on programmed clock settings.  I 
know in HBX mode we can control when we buy from the grid, wondering if anyone 
knows how to control if and when we sell to the grid, separate from voltage set 
points.  In this situation we basically don't want to sell hydro power back at 
night.
We can create our own relay controls to prevent if we need to, but hoping 
someone has a Mate controller based programming solution.  I can't seem to find 
it and at first glance Outback tech support didn't have an answer...It was a 
new tech support guy I spoke with and he was going to do some research and get 
back to me.
100 Thanks!

Sunny Regards,
Kirpal Khalsa
Oregon LRT#25
Oregon Solarworks LLC
www.oregonsolarworks.com
541-299-0402


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[RE-wrenches] grid sell back time settings on Outback systems

[Kirpal]

Hi Folks
We have a scenario where we would like to control when our system sells
power back to the grid.  Basically, we only want to sell back while the sun
is shining. We would like to stop selling based on programmed clock
settings.  I know in HBX mode we can control when we buy from the grid,
wondering if anyone knows how to control if and when we sell to the grid,
separate from voltage set points.  In this situation we basically don't
want to sell hydro power back at night.
We can create our own relay controls to prevent if we need to, but hoping
someone has a Mate controller based programming solution.  I can't seem to
find it and at first glance Outback tech support didn't have an answer...It
was a new tech support guy I spoke with and he was going to do some
research and get back to me.
100 Thanks!

Sunny Regards,
Kirpal Khalsa
Oregon LRT#25
Oregon Solarworks LLC
www.oregonsolarworks.com
541-299-0402
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Re: [RE-wrenches] Tesla Powerwall

[August Goers]

Hi Darryl -

Yea, you have a good point. We have recently used the SMA freq/watt
curtailment feature on a bigger off grid system with SMA Tripower inverters
and a Tesla Powerpack. We programmed a curve into the SMA inverters so that
the Powerpack can throttle SMA PV production on a smooth curve, rather than
just binary on/off. We've done this with Sunny Island based systems too. I
don't know about the ability of the Powerwall to do this. It's a good
question. It gets tricky trying to meet the utility-approved grid tied
settings while optimizing offgrid settings, especially when AC coupling
different inverter manufacturers. So, we've been leaving all of our
Powerwall and PV systems in the normal ongrid mode. The only real downside
is that when the grid is down, and PV is producing more than the battery
needs, it will just turn off, wait, and then back on over and over, rather
than throttle. It is nice to have it just throttle, but not really a big
deal for most applications that are primarily grid tied. I have to think
manufacturers are thinking about getting that freq/watt curtailment to work
across different AC coupled applications. That would be cool. That is a
potential benefit of a all-one-manufacturer AC-coupled solution such as
Enphase's Encharge or SunPower's new SunVault system. However, I don't know
they're implementing that feature either, yet.

August


On Thu, Feb 4, 2021 at 3:59 AM Darryl Thayer  wrote:

> Here is my two cents worth.  the PW is "grid following" and so is the
> sunny boy when the grid is up.  When the grid fails the PW becomes grid
> forming, bi-directional, inverter charger with frequency shift to control
> charging.  The newer SBs will accept frequency shifts and be controlled.
> So yes it should work, but I have not tried this, and someone with
> experience should answer.
>
> On Thu, Feb 4, 2021 at 1:19 AM Jerry Shafer 
> wrote:
>
>> Mr Hill
>> The PW is AC coupled so any inverter but the newer the better with Freq
>> shift capable may take programming to work best.
>> Jerry
>>
>> On Mon, Feb 1, 2021, 10:03 AM Jonathan Hill  wrote:
>>
>>> So it can be used with a Sunnyboy, correct? Have you ever installed one?
>>>
>>> Jon Hill
>>> Solar design engineer
>>> 530-559-3781
>>> solar...@gmail.com
>>>
>>>
>>> On Jan 31, 2021, at 4:11 PM, Jerry Shafer 
>>> wrote:
>>>
>>> 
>>> Tesla is ac coupled  you need the tesla transfer switch and a sub panel,
>>> everything into and out of that. But its AC coupled so there is that too.
>>> Jerry
>>>
>>> On Sun, Jan 31, 2021, 3:18 PM Jonathan Hill  wrote:
>>>
 Anyone have experience combining some Tesla Powerwalls with Sunnyboy
 inverters ro other string inverters?
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Re: [RE-wrenches] Tesla Powerwall

[Darryl Thayer]

Here is my two cents worth.  the PW is "grid following" and so is the sunny
boy when the grid is up.  When the grid fails the PW becomes grid forming,
bi-directional, inverter charger with frequency shift to control charging.
The newer SBs will accept frequency shifts and be controlled.  So yes it
should work, but I have not tried this, and someone with experience should
answer.

On Thu, Feb 4, 2021 at 1:19 AM Jerry Shafer 
wrote:

> Mr Hill
> The PW is AC coupled so any inverter but the newer the better with Freq
> shift capable may take programming to work best.
> Jerry
>
> On Mon, Feb 1, 2021, 10:03 AM Jonathan Hill  wrote:
>
>> So it can be used with a Sunnyboy, correct? Have you ever installed one?
>>
>> Jon Hill
>> Solar design engineer
>> 530-559-3781
>> solar...@gmail.com
>>
>>
>> On Jan 31, 2021, at 4:11 PM, Jerry Shafer 
>> wrote:
>>
>> 
>> Tesla is ac coupled  you need the tesla transfer switch and a sub panel,
>> everything into and out of that. But its AC coupled so there is that too.
>> Jerry
>>
>> On Sun, Jan 31, 2021, 3:18 PM Jonathan Hill  wrote:
>>
>>> Anyone have experience combining some Tesla Powerwalls with Sunnyboy
>>> inverters ro other string inverters?
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