Re: [RE-wrenches] Large Off-Grid Residential System and ciculating currents

[August Goers]

Hi William - Yea, your kWh calculation is correct. However, the 16 kWh Blue
Ion is comparable to eight L16 (6 volt x 333 Ah each) batteries, not one -
nameplate rating. Typically you can go way deeper discharge with the
lithium products, so the Blue Ion might be more comparable to sixteen (or
even more) L16 batteries in the real world.

I can't speak to the parallel battery issue you raise with Blue Ion or
other similar batteries such as Discover - it would seem like their
engineering team could help with that.

August

Luminalt


On Tue, Jul 23, 2019 at 4:59 PM William Miller 
wrote:

> Friends:
>
>
>
> I am a complete newbie to any lithium technologies, so please forgive some
> newbie questions:
>
>
>
> I am used to working in amp hours.  If we are looking for a battery bank
> in the range of 100 kWh, this converts to about 2,083 amp/hours at 48 VDC.
> Is my arithmetic correct?  An on-line calculator seems to confirm this.
>
>
>
> The biggest Blue Ion 2 battery is 16 kwh.  At 48 VDC this is about 333
> amp/hours.  This is like an L16.  To get 100 kwh you would need to parallel
> 6 strings of the 16 kWh batteries.  I would never do this with L-16s.  Is
> anyone worried about circulating currents in this type of installation?  Is
> there technology to prevent one string from cannibalizing another?
>
>
>
> Here is another, more academic question below:
>
>
>
> In case I am using a term I made up (which is often the case), I define
> circulating currents as currents flowing between parallel strings without
> any outside influence.  For example, if you disconnected all charging and
> loads from an array with two parallel strings, unless the strings were
> absolutely identical in electrical characteristics, there would be some
> current flowing between the two strings.  In my opinion this is the
> Achilles heel in parallel strings.  Also my opinions:  2. The more strings
> you have the more chance there will be debilitating circulating currents.
> 3. The older the batteries, the more the electrical characteristics will
> vary and the more likely you will get higher circulating currents.
>
>
>
> It is my theory that if you can measure the circulating currents, or the
> difference between parallel battery strings at any point in the operation
> of same, you can get a read on the health of the strings.  The more the
> operating or idle currents diverge, the more one string will discharge the
> other string.  I guess this is some part of a battery management system.  I
> am guessing for the Blue Ion 2 to work in 6 parallel strings, they need to
> monitor and control this difference in currents.
>
>
>
> We just installed a flooded battery array (2 strings of 4 Deka M6100-33
> batteries).  My plan is to retrofit the installation with a 1000A/100mv
> shunt in the negative leads of both strings.  With a DVM I can spot check
> the circulating currents to learn about the battery health.  In fact I have
> a remote monitoring system
> 
> with some spare ports that can log these values.  Might be an interesting
> experiment.
>
>
>
> I appreciate any input on the viability of the Blue Ion 2 or other small
> battery systems in multi-string installations.  My customers are asking for
> new technology, but I instinctively avoid parallel battery strings.
>
>
>
> William Miller
>
>
>
>
>
>
>
> Miller Solar
>
> 17395 Oak Road, Atascadero, CA 93422
>
> 805-438-5600
>
> www.millersolar.com
>
> CA Lic. 773985
>
>
>
> Quote of the month:  “As they age, batteries transition from energy
>
> storage devices to energy consuming devices.“ W. Miller
>
>
>
> *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On
> Behalf Of *Lou Russo
> *Sent:* Saturday, July 20, 2019 1:50 PM
> *To:* RE-wrenches
> *Subject:* Re: [RE-wrenches] Large Off-Grid Residential System
>
>
>
> Blue Ion 2.0 with Outback or SMA. Works every time.
>
> Blue Planet's tech support is great, the warranty is even better.
>
>
>
> Aloha,
>
>
>
> Lou Russo
>
> l...@spreesolarsystems.com
>
> 808 345 6762
>
> Spree Solar Systems LLC
>
> CT-34322
>
>
>
>
>
>
>
> On Sat, Jul 20, 2019 at 10:36 AM Jay  wrote:
>
> Hi Marco,
>
>
>
> Is the max surge 7kw, which is what is listed on line?
>
>
>
> Jay
>
> Peltz Power
>
>
> On Jul 19, 2019, at 3:10 PM, Marco Mangelsdorf 
> wrote:
>
> Seven to eight Tesla Powerwalls will get you that assuming that the
> service entrance is no bigger than 200A.
>
>
>
> marco
>
> On Friday, July 19, 2019, Jason Szumlanski <
> ja...@floridasolardesigngroup.com> wrote:
>
> What are current popular options for battery based systems in the 100kWh
> range? Preferably Lithium.
>
>
>
> Also, what inverter pairing is suggested with total stacked capacity of
> 36kW, 120/240V?
>
>
>
> This is slightly larger than some of the systems I have worked with
> recently. I'm a bit out of the loop, particularly on the battery side of
> things.
>
>
>
> Jason Szumlan

Re: [RE-wrenches] Large Off-Grid Residential System and ciculating currents

[Will White]

William,

August is right, the Blue Ion batteries are rated for 100% DOD so to get
the same usable capacity from an L16 at 50% DOD you'd need twice the
overall capacity. Plus most lithium-ion batteries will last significantly
longer than lead-acid so you have to factor in replacement costs when doing
a life cycle cost comparison.

All reputable lithium-ion batteries will come with a battery management
system (Blue Ion calls theirs a battery management unit) that controls
charging and discharging of the cells to ensure even charging. That's why
you can run many more in parallel because the BMS will make sure the cells
are evenly charged. The only limit to units in parallel with lithium-ion is
the manufacturers maximum. You still need to make sure the parallel cables
are the same length. With most lithium-ion batteries you need to order the
battery at the nominal voltage of the system. For example, if you have a 48
V system you need a 48 V battery, you can't (usually) use two 24 V
batteries in series with lithium-ion.

Thanks,
Will
-- 
*Will White*
Curriculum Developer


e: w...@solarenergy.org
w: www.solarenergy.org
p: 802-272-3092

NABCEP Certified PV Installation Professional
# 093006-34

On Wed, Jul 24, 2019 at 9:22 AM August Goers  wrote:

> Hi William - Yea, your kWh calculation is correct. However, the 16 kWh
> Blue Ion is comparable to eight L16 (6 volt x 333 Ah each) batteries, not
> one - nameplate rating. Typically you can go way deeper discharge with the
> lithium products, so the Blue Ion might be more comparable to sixteen (or
> even more) L16 batteries in the real world.
>
> I can't speak to the parallel battery issue you raise with Blue Ion or
> other similar batteries such as Discover - it would seem like their
> engineering team could help with that.
>
> August
>
> Luminalt
>
>
> On Tue, Jul 23, 2019 at 4:59 PM William Miller 
> wrote:
>
>> Friends:
>>
>>
>>
>> I am a complete newbie to any lithium technologies, so please forgive
>> some newbie questions:
>>
>>
>>
>> I am used to working in amp hours.  If we are looking for a battery bank
>> in the range of 100 kWh, this converts to about 2,083 amp/hours at 48 VDC.
>> Is my arithmetic correct?  An on-line calculator seems to confirm this.
>>
>>
>>
>> The biggest Blue Ion 2 battery is 16 kwh.  At 48 VDC this is about 333
>> amp/hours.  This is like an L16.  To get 100 kwh you would need to parallel
>> 6 strings of the 16 kWh batteries.  I would never do this with L-16s.  Is
>> anyone worried about circulating currents in this type of installation?  Is
>> there technology to prevent one string from cannibalizing another?
>>
>>
>>
>> Here is another, more academic question below:
>>
>>
>>
>> In case I am using a term I made up (which is often the case), I define
>> circulating currents as currents flowing between parallel strings without
>> any outside influence.  For example, if you disconnected all charging and
>> loads from an array with two parallel strings, unless the strings were
>> absolutely identical in electrical characteristics, there would be some
>> current flowing between the two strings.  In my opinion this is the
>> Achilles heel in parallel strings.  Also my opinions:  2. The more strings
>> you have the more chance there will be debilitating circulating currents.
>> 3. The older the batteries, the more the electrical characteristics will
>> vary and the more likely you will get higher circulating currents.
>>
>>
>>
>> It is my theory that if you can measure the circulating currents, or the
>> difference between parallel battery strings at any point in the operation
>> of same, you can get a read on the health of the strings.  The more the
>> operating or idle currents diverge, the more one string will discharge the
>> other string.  I guess this is some part of a battery management system.  I
>> am guessing for the Blue Ion 2 to work in 6 parallel strings, they need to
>> monitor and control this difference in currents.
>>
>>
>>
>> We just installed a flooded battery array (2 strings of 4 Deka M6100-33
>> batteries).  My plan is to retrofit the installation with a 1000A/100mv
>> shunt in the negative leads of both strings.  With a DVM I can spot check
>> the circulating currents to learn about the battery health.  In fact I have
>> a remote monitoring system
>> 
>> with some spare ports that can log these values.  Might be an interesting
>> experiment.
>>
>>
>>
>> I appreciate any input on the viability of the Blue Ion 2 or other small
>> battery systems in multi-string installations.  My customers are asking for
>> new technology, but I instinctively avoid parallel battery strings.
>>
>>
>>
>> William Miller
>>
>>
>>
>>
>>
>>
>>
>> Miller Solar
>>
>> 17395 Oak Road, Atascadero, CA 93422
>>
>> 805-438-5600
>>
>> www.millersolar.com
>>
>> CA Lic. 773985
>>
>>
>>
>> Quote of the month:  “As they age, batteries transition from energy
>

[RE-wrenches] SolarEdge reliability declining...???

[Howard Arey]

Have any of you seen significant declines in SolarEdge inverter reliability?

We are having more inverter failures that at any time in the past five years
of installing SolarEdge. Lots of Code 181 hardware failures mostly in the
latest SetApp inverters (the ones without displays.)

To compound matters, the RMA process is getting way too long and we are
waiting appx 3 weeks on average to receive a replacement. Customers
definitely not happy.

What are you all seeing?

 

Howard "Scot" Arey

Owner, Solar CenTex

NABCEP Certified PV Installation Professional

254-300-1228

scot.a...@solarcentex.com

 

www.solarcentex.com  

https://www.facebook.com/SolarCentex





 

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Re: [RE-wrenches] SolarEdge reliability declining...???

[Andrew]

Hey Howard,

We have started to notice this as well, we recently got 2
DOA inverters(new setapps) in a row for the same client.They were not happy
either. I have also noticed their tech support has also gotten worse with
huge wait times or call backs days later. I really enjoy their equipment but
it's a bummer that their quality has gone done hill.

 

 

Andrew Perkins

Greenwired

P: 707-923-2001 ext. 100

1150 #1 Evergreen Rd

Redway, CA 95560

www.greenwired.com

Description: signature

 

 

 

From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On
Behalf Of Howard Arey
Sent: Wednesday, July 24, 2019 7:37 AM
To: 'RE-wrenches'
Subject: [RE-wrenches] SolarEdge reliability declining...???

 

Have any of you seen significant declines in SolarEdge inverter reliability?

We are having more inverter failures that at any time in the past five years
of installing SolarEdge. Lots of Code 181 hardware failures mostly in the
latest SetApp inverters (the ones without displays.)

To compound matters, the RMA process is getting way too long and we are
waiting appx 3 weeks on average to receive a replacement. Customers
definitely not happy.

What are you all seeing?

 

Howard "Scot" Arey

Owner, Solar CenTex

NABCEP Certified PV Installation Professional

254-300-1228

scot.a...@solarcentex.com

 

www.solarcentex.com  

https://www.facebook.com/SolarCentex

Solar Centex Logo - No Back

 

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Re: [RE-wrenches] Large Off-Grid Residential System and ciculating currents

[Dave Angelini Offgrid Solar]

Hi William, 

I think you are smart to taking your time going to Lithium
Ion. I will let others work the math as each application/client is really
different. 

I have a few clients offgrid who are early adopters and there
have been a few failures I have observed. For grid based Apps I really do
not concern myself because the grid is there for back-up. I will just say
the LFP battery management system is a new set of ways to lose power
offgrid. I am backing up my clients and have always done that at my offgrid
home. 

Here is a link to the testing I have been watching since I started
testing advanced battery technology in the field for Schneider in 2016. 

A
61% failure rate is not good news to me. Blue Ion And Discover is not in
the testing and the Muarta battery they use is doing very well.


https://www.solarquotes.com.au/blog/6th-canberra-battery-test/ [1] 
Dave
Angelini Offgrid Solar
"we go where powerlines
don't"
http://members.sti.net/offgridsolar/ [2]
e-mail offgridso...@sti.net
[3]
text 209 813 0060

On Tue, 23 Jul 2019 15:08:49 -0700, William Miller 
wrote:   

Friends: 

I am a complete newbie to any lithium technologies,
so please forgive some newbie questions: 

I am used to working in amp
hours. If we are looking for a battery bank in the range of 100 kWh, this
converts to about 2,083 amp/hours at 48 VDC. Is my arithmetic correct? An
on-line calculator seems to confirm this. 

The biggest Blue Ion 2 battery
is 16 kwh. At 48 VDC this is about 333 amp/hours. This is like an L16. To
get 100 kwh you would need to parallel 6 strings of the 16 kWh batteries. I
would never do this with L-16s. Is anyone worried about circulating
currents in this type of installation? Is there technology to prevent one
string from cannibalizing another? 

Here is another, more academic
question below: 

In case I am using a term I made up (which is often the
case), I define circulating currents as currents flowing between parallel
strings without any outside influence. For example, if you disconnected all
charging and loads from an array with two parallel strings, unless the
strings were absolutely identical in electrical characteristics, there
would be some current flowing between the two strings. In my opinion this
is the Achilles heel in parallel strings. Also my opinions: 2. The more
strings you have the more chance there will be debilitating circulating
currents. 3. The older the batteries, the more the electrical
characteristics will vary and the more likely you will get higher
circulating currents. 

It is my theory that if you can measure the
circulating currents, or the difference between parallel battery strings at
any point in the operation of same, you can get a read on the health of the
strings. The more the operating or idle currents diverge, the more one
string will discharge the other string. I guess this is some part of a
battery management system. I am guessing for the Blue Ion 2 to work in 6
parallel strings, they need to monitor and control this difference in
currents. 

We just installed a flooded battery array (2 strings of 4 Deka
M6100-33 batteries). My plan is to retrofit the installation with a
1000A/100mv shunt in the negative leads of both strings. With a DVM I can
spot check the circulating currents to learn about the battery health. In
fact I have a remote monitoring system [4] with some spare ports that can
log these values. Might be an interesting experiment. 

I appreciate any
input on the viability of the Blue Ion 2 or other small battery systems in
multi-string installations. My customers are asking for new technology, but
I instinctively avoid parallel battery strings. 

William Miller 

Miller
Solar 

17395 Oak Road, Atascadero, CA 93422 

805-438-5600


www.millersolar.com [5] 

CA Lic. 773985 

Quote of the month: "As they
age, batteries transition from energy  

storage devices to energy
consuming devices." W. Miller 

FROM: RE-wrenches
[mailto:re-wrenches-boun...@lists.re-wrenches.org [6]] ON BEHALF OF Lou
Russo
SENT: Saturday, July 20, 2019 1:50 PM
TO: RE-wrenches
SUBJECT: Re:
[RE-wrenches] Large Off-Grid Residential System 

Blue Ion 2.0 with Outback
or SMA. Works every time.   

Blue Planet's tech support is great, the
warranty is even better.  

Aloha,  

Lou Russo  


l...@spreesolarsystems.com [7]   

808 345 6762   

Spree Solar Systems
LLC

CT-34322   

On Sat, Jul 20, 2019 at 10:36 AM Jay  wrote: 

Hi
Marco,   

Is the max surge 7kw, which is what is listed on line?   

Jay  


Peltz Power   

On Jul 19, 2019, at 3:10 PM, Marco Mangelsdorf  wrote:   


Seven to eight Tesla Powerwalls will get you that assuming that the
service entrance is no bigger than 200A.  

marco 

On Friday, July 19,
2019, Jason Szumlanski  wrote:   

What are current popular options for
battery based systems in the 100kWh range? Preferably Lithium.   

Also,
what inverter pairing is suggested with total stacked capacity of 36kW,
120/240V?   

This is slightly larger than some of 

Re: [RE-wrenches] SolarEdge reliability declining...???

[Jerry Shafer]

Wrenches
For some time starting last fall and into the spring we had several 7600
with some sort of issue, some comms, some dead, some failed in the field
shortly after install, once we did the repairs/RMA's they seemed ok but we
have moved away from them this year.
Jerry

On Wed, Jul 24, 2019, 12:55 PM Andrew  wrote:

> Hey Howard,
>
> We have started to notice this as well, we recently got 2
> DOA inverters(new setapps) in a row for the same client…They were not happy
> either. I have also noticed their tech support has also gotten worse with
> huge wait times or call backs days later. I really enjoy their equipment
> but it’s a bummer that their quality has gone done hill.
>
>
>
>
>
> Andrew Perkins
>
> Greenwired
>
> P: 707-923-2001 ext. 100
>
> 1150 #1 Evergreen Rd
>
> Redway, CA 95560
>
> www.greenwired.com
>
> [image: Description: signature]
>
>
>
>
>
>
>
> *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On
> Behalf Of *Howard Arey
> *Sent:* Wednesday, July 24, 2019 7:37 AM
> *To:* 'RE-wrenches'
> *Subject:* [RE-wrenches] SolarEdge reliability declining...???
>
>
>
> Have any of you seen significant declines in SolarEdge inverter
> reliability?
>
> We are having more inverter failures that at any time in the past five
> years of installing SolarEdge. Lots of Code 181 hardware failures mostly in
> the latest SetApp inverters (the ones without displays.)
>
> To compound matters, the RMA process is getting way too long and we are
> waiting appx 3 weeks on average to receive a replacement. Customers
> definitely not happy…
>
> What are you all seeing?
>
>
>
> *Howard “Scot” Arey*
>
> Owner, Solar CenTex
>
> NABCEP Certified PV Installation Professional
>
> 254-300-1228
>
> scot.a...@solarcentex.com
>
>
>
> www.solarcentex.com
>
> https://www.facebook.com/SolarCentex
>
> [image: Solar Centex Logo - No Back]
>
>
> ___
> List sponsored by Redwood Alliance
>
> 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
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Re: [RE-wrenches] SolarEdge reliability declining...???

[Brett Bartmasser]

We have had countless failures on the HD Waves, I am surprised they are
even still in business. We have generally moved away from them in the last
year. I have never seen an issue with their older equipment.

On Wed, Jul 24, 2019 at 1:10 PM Jerry Shafer 
wrote:

> Wrenches
> For some time starting last fall and into the spring we had several 7600
> with some sort of issue, some comms, some dead, some failed in the field
> shortly after install, once we did the repairs/RMA's they seemed ok but we
> have moved away from them this year.
> Jerry
>
> On Wed, Jul 24, 2019, 12:55 PM Andrew  wrote:
>
>> Hey Howard,
>>
>> We have started to notice this as well, we recently got 2
>> DOA inverters(new setapps) in a row for the same client…They were not happy
>> either. I have also noticed their tech support has also gotten worse with
>> huge wait times or call backs days later. I really enjoy their equipment
>> but it’s a bummer that their quality has gone done hill.
>>
>>
>>
>>
>>
>> Andrew Perkins
>>
>> Greenwired
>>
>> P: 707-923-2001 ext. 100
>>
>> 1150 #1 Evergreen Rd
>>
>> Redway, CA 95560
>>
>> www.greenwired.com
>>
>> [image: Description: signature]
>>
>>
>>
>>
>>
>>
>>
>> *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On
>> Behalf Of *Howard Arey
>> *Sent:* Wednesday, July 24, 2019 7:37 AM
>> *To:* 'RE-wrenches'
>> *Subject:* [RE-wrenches] SolarEdge reliability declining...???
>>
>>
>>
>> Have any of you seen significant declines in SolarEdge inverter
>> reliability?
>>
>> We are having more inverter failures that at any time in the past five
>> years of installing SolarEdge. Lots of Code 181 hardware failures mostly in
>> the latest SetApp inverters (the ones without displays.)
>>
>> To compound matters, the RMA process is getting way too long and we are
>> waiting appx 3 weeks on average to receive a replacement. Customers
>> definitely not happy…
>>
>> What are you all seeing?
>>
>>
>>
>> *Howard “Scot” Arey*
>>
>> Owner, Solar CenTex
>>
>> NABCEP Certified PV Installation Professional
>>
>> 254-300-1228
>>
>> scot.a...@solarcentex.com
>>
>>
>>
>> www.solarcentex.com
>>
>> https://www.facebook.com/SolarCentex
>>
>> [image: Solar Centex Logo - No Back]
>>
>>
>> ___
>> List sponsored by Redwood Alliance
>>
>> 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
>>
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>>
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>> www.re-wrenches.org/etiquette.htm
>>
>> Check out or update participant bios:
>> www.members.re-wrenches.org
>>
>> ___
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> List Address: RE-wrenches@lists.re-wrenches.org
>
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Re: [RE-wrenches] 230Vac load on OB FX2524T system

[Ray]

The transformer is just to balance the legs, and isn't necessary to run 
the heat pump with 2 inverters.  On the programming, port 1 should be 
/stack //1-2 ph Master/, and then set port 2 to /Classic slave./


BTW,  we as an industry should move far away from this archaic and 
offensive labeling.  Master? Slave?   My daughter heard me mention that 
the other day and was mortified, as all of us should be too.  
Gentlefolks, it's time for some 21st Century solar Vocabulary.


Ray Walters
Remote Solar
303 505-8760

On 7/24/19 6:08 PM, David Palumbo wrote:


I apologize for my ignorance on this issue, but in all my years I have 
never had to power a 230V load with an OutBack system before.


A couple of quick questions. It is a 8 year old OutBack system with 
two FX2524T’s presently powering two 120Vac legs with no 240Vac output.


  * Homeowner is adding a Fujitsu mini split heat pump for air
conditioning the home (summers are getting hot enough for AC even
in northern Vermont).
  * It uses 7.9 Amps @ 230Vac
  * I have a OB PSX-240 Autoformer manufactured in 2008 in my
inventory here. Should I use it for this application?
  * Do I wire it up just like in this schematic?
  * If so, what do I change in the programing on the Mate?  Presently
it is ADV/FX/STACK  stack 1-2ph Master. Do I simply change it to
 ADV/FX/STACK  stack Classic Slave?

Thanks,

Dave Palumbo, Independent Power, Hyde Park, VT

cid:image003.jpg@01D54135.D30AA520

Sent from Mail  for 
Windows 10



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[RE-wrenches] SolarEdge AC coupled off-grid

[Howie Michaelson]

I have used SolarEdge to AC couple a smaller Array in the past, with no
issues. I recently added a fairly significant array (6.2k DC via a SE6K
(setap) inverter in an off-grid home which has had a dual stack VFX3648 for
many years.  I also added 32kWh of Blue Ion batteries replacing an 80kWh
older flood Rolls "KS" battery bank.

Unfortunately, it appears the SolarEdge is having trouble staying connected
to the VFXs.  According to the errors the SE throws errors indicating an
grid instability and excessive harmonics.  I made the mistake of telling SE
that this was an off-grid application, and they basically stopped talking
to me after explaining what the error codes mean.

I'm wondering if the VFXs are just not capable of putting out clean anough
ooo
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[RE-wrenches] SolarEdge AC coupled off-grid (part 2)

[Howie Michaelson]

sorry, prematurely emailed previous post:

I'm wondering if the VFXs are just not capable of putting out clean enough
power in order to hold the SE HD inverter. I had it operating on this same
system for a couple of hours with not this problem.  Is it likely that this
inverter combo is not going to work consistently?  Will it make sense to
use a different battery inverter (XW+6848 or Radian)? What has folks
experience been in similar off-grid AC coupled SE systems?
As always, thanks in advance for any thoughts.

Best,
Howie
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Re: [RE-wrenches] SolarEdge AC coupled off-grid (part 2)

[Ray]

I do not recommend AC coupling for off grid, except to offset daytime 
loads or to add PV at remote buildings.  Besides coupling errors like 
you're experiencing, the entire system will shut down and not recharge, 
if the VFX inverters shut down.   With a DC coupled array, the batteries 
can recharge, even if the inverters have shut down for low voltage, over 
load, etc.  At least when someone comes to reset it, the battery won't 
be dead too.  The 3rd reason, as you've found, SE and other GT manus, 
don't want to deal with off grid.


There are higher voltage, higher capacity Charge controllers available 
now, like the FM100, and Magnum PT 100 that could almost handle that 
array with one controller.  The PT 100 will work with Midnite's SOB 
rapid disconnect system.



Ray Walters
Remote Solar
303 505-8760

On 7/24/19 11:03 PM, Howie Michaelson wrote:

sorry, prematurely emailed previous post:

I'm wondering if the VFXs are just not capable of putting out clean 
enough power in order to hold the SE HD inverter. I had it operating 
on this same system for a couple of hours with not this problem.  Is 
it likely that this inverter combo is not going to work consistently?  
Will it make sense to use a different battery inverter (XW+6848 or 
Radian)? What has folks experience been in similar off-grid AC coupled 
SE systems?

As always, thanks in advance for any thoughts.

Best,
Howie

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