[RE-wrenches] Module level storage

[Jay]

Hi all,

I had someone send me this link about a battery storage device that fits under 
the modules. 

Curious if anyone has seen it, knows anything about it, or opinions?
https://simplglobal.com/

It doesn’t seem right to me. 

But I bet someone out there knows more,

Thx
Jay
Peltz power. 


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Re: [RE-wrenches] Schneider Phone Support

[Ray]

I was also considering Schneider for my next system, but this support 
issue is not encouraging.  Meanwhile the voltage fluctuation issue with 
the Magnum inverters seems to not cause as much trouble as I first 
thought.  I tested LED, and CFL lights, along with a small motor, and 
could not see a perceptible variation in performance.  The fluctuation 
also seems to slow under load, as I was seeing the voltage dip to 116 
from 122 for about 5 sec approx every minute.  Guess I'll be sticking 
with Magnum, because they still answer the phone.


Ray Walters
Remote Solar
303 505-8760

On 1/9/19 3:49 PM, Tump wrote:
Are you saying we need to jump thru more hoops to use 
unreliable/questionable product support? OMG
On Jan 9, 2019, at 5:42 PM, Howie Michaelson 
mailto:howie.michael...@gmail.com>> wrote:


Hi all,
Concerned by this thread, I went through the process of registering 
as an installer on line. A short while later I was sent an email of 
acceptance and a phone number. I was implored to not share the 
number. I did try it and was successful at reaching tech support on 
first try. Thanks for the warning that the process has changed, it 
would have been a pain to be on a service call without having gone 
through this ahead of time.

Howie


On Wed, Jan 9, 2019, 9:56 AM  wrote:


Hello Wrenches,

Does Schneider phone support still exist? I filled out an on line
form, as a professional, to be able to get phone support.
Schneider sent me an email with two numbers to call, and neither
of them worked. One did not connect to anything and the other
gave me the original message saying to fill out the form for tech
support.

Using their on-line support has been limited in its usefulness,
with a lot of runaround. No one there will answer any questions
about phone support availability.

The timing of this is interesting, as I was on the verge of using
Schneider as my go-to brand for battery based equipment. . One
Wrench posting from a while back that stuck in my head was,
"before buying equipment, call their tech support to see how good
it is."

Does anyone know if phone support still exists?

Thank you,

Drake

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Re: [RE-wrenches] Schneider Phone Support

[Dave Angelini Offgrid Solar]

What firmware revision is in the CSW's please? If you download the
firmware there is a revision page that says what was fixed. The fan issue
was 3 revisions back. If the fan circuit is damaged, the default is fans
on. I only use XW's for my clients because they are what should be used
offgrid in my opinion. 

Two years is the warranty period for a CSW and 5
or 10 for an XW. I am not defending this phone thing but I will get back
with what I find out. I agree totally about the phone business. I can say
that most of the folks in Burnaby where Schneider Solar is are often out
around this time of year. Many tech companies holiday for at least 2 weeks
or more, but I get the frustration. 
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

On Wed, 9 Jan 2019 16:54:38
-0500, Tump  wrote: The older SWs is just a simple thermistor replacement.
Kris at Tekris power probably has them.
   On Jan 9, 2019, at 10:34 AM,
Amanda Potter  wrote: 
  Hello Wrenches, I am having the same issue. I have
Comboxs out there that have the latest firmware, but they haven't worked
for quite a while and my customers are not happy... And, a SW 4024, three
years old with the fans running non stop, no matter what the temperatures
are and they will not warranty. That is what the last email said from Tech
Support.   Thoughts?   Thanks ahead of time.Amanda Potter NABCEP  PV
Installation Professional NYSERDA Eligible PV Installer  Adirondack Battery
">(315) 212-2114   
On Jan 9, 2019, at 9:56 AM,
drake.chamber...@redwoodalliance.org [4] wrote:

   Hello Wrenches,   Does
Schneider phone support still exist? I filled out an on line form, as a
professional, to be able to get phone support. Schneider sent me an email
with two numbers to call, and neither of them worked. One did not connect
to anything and the other gave me the original message saying to fill out
the form for tech support.   Using their on-line support has been limited
in its usefulness, with a lot of runaround. No one there will answer any
questions about phone support availability.   The timing of this is
interesting, as I was on the verge of using Schneider as my go-to brand for
battery based equipment. . One Wrench posting from a while back that stuck
in my head was, "before buying equipment, call their tech support to see
how good it is."Does anyone know if phone support still exists?   Thank
you,   Drake  

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Re: [RE-wrenches] Schneider Phone Support

[Tump]

Are you saying we need to jump thru more hoops to use unreliable/questionable 
product support? OMG
> On Jan 9, 2019, at 5:42 PM, Howie Michaelson  
> wrote:
> 
> Hi all,
> Concerned by this thread, I went through the process of registering as an 
> installer on line. A short while later I was sent an email of acceptance and 
> a phone number. I was implored to not share the number. I did try it and was 
> successful at reaching tech support on first try. Thanks for the warning that 
> the process has changed, it would have been a pain to be on a service call 
> without having gone through this ahead of time.
> Howie
> 
> 
> On Wed, Jan 9, 2019, 9:56 AM   wrote:
> Hello Wrenches,
> 
> Does Schneider phone support still exist? I filled out an on line form, as a 
> professional, to be able to get phone support. Schneider sent me an email 
> with two numbers to call, and neither of them worked. One did not connect to 
> anything and the other gave me the original message saying to fill out the 
> form for tech support.
> 
> Using their on-line support has been limited in its usefulness, with a lot of 
> runaround. No one there will answer any questions about phone support 
> availability.
> 
> The timing of this is interesting, as I was on the verge of using Schneider 
> as my go-to brand for battery based equipment. . One Wrench posting from a 
> while back that stuck in my head was, "before buying equipment, call their 
> tech support to see how good it is." 
> 
> Does anyone know if phone support still exists?
> 
> Thank you,
> 
> Drake 
> 
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> 
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>   NABCEP"Certified PV Installer" 
>
>     MAINE'S CHARTER 
>   Trace Xantrex "Certified" Dealer / Installer"
> 


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Re: [RE-wrenches] Schneider Phone Support

[Howie Michaelson]

Hi all,
Concerned by this thread, I went through the process of registering as an
installer on line. A short while later I was sent an email of acceptance
and a phone number. I was implored to not share the number. I did try it
and was successful at reaching tech support on first try. Thanks for the
warning that the process has changed, it would have been a pain to be on a
service call without having gone through this ahead of time.
Howie


On Wed, Jan 9, 2019, 9:56 AM  Hello Wrenches,
>
> Does Schneider phone support still exist? I filled out an on line form, as
> a professional, to be able to get phone support. Schneider sent me an email
> with two numbers to call, and neither of them worked. One did not connect
> to anything and the other gave me the original message saying to fill out
> the form for tech support.
>
> Using their on-line support has been limited in its usefulness, with a lot
> of runaround. No one there will answer any questions about phone support
> availability.
>
> The timing of this is interesting, as I was on the verge of using
> Schneider as my go-to brand for battery based equipment. . One Wrench
> posting from a while back that stuck in my head was, "before buying
> equipment, call their tech support to see how good it is."
>
> Does anyone know if phone support still exists?
>
> Thank you,
>
> Drake
>
>
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Re: [RE-wrenches] Schneider Phone Support

[Tump]

The older SWs is just a simple thermistor replacement. Kris at Tekris power 
probably has them.
> On Jan 9, 2019, at 10:34 AM, Amanda Potter  
> wrote:
> 
> Hello Wrenches,
> I am having the same issue.
> I have Comboxs out there that have the latest firmware, but they haven’t 
> worked for quite a while and my customers are not happy...
> And, a SW 4024, three years old with the fans running non stop, no matter 
> what the temperatures are and they will not warranty.
> That is what the last email said from Tech Support.
> 
> Thoughts?
> 
> Thanks ahead of time.
> 
> Amanda Potter
> NABCEP 
> PV Installation Professional
> NYSERDA Eligible PV Installer
> Adirondack Battery & Solar, LLC
> Potsdam, NY
> (315) 212-2114
> 
> On Jan 9, 2019, at 9:56 AM, drake.chamber...@redwoodalliance.org 
>  wrote:
> 
>> Hello Wrenches,
>> 
>> Does Schneider phone support still exist? I filled out an on line form, as a 
>> professional, to be able to get phone support. Schneider sent me an email 
>> with two numbers to call, and neither of them worked. One did not connect to 
>> anything and the other gave me the original message saying to fill out the 
>> form for tech support.
>> 
>> Using their on-line support has been limited in its usefulness, with a lot 
>> of runaround. No one there will answer any questions about phone support 
>> availability.
>> 
>> The timing of this is interesting, as I was on the verge of using Schneider 
>> as my go-to brand for battery based equipment. . One Wrench posting from a 
>> while back that stuck in my head was, "before buying equipment, call their 
>> tech support to see how good it is." 
>> 
>> Does anyone know if phone support still exists?
>> 
>> Thank you,
>> 
>> Drake 
>> 
>> 
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Re: [RE-wrenches] Equipment ideas for very large residential PV and battery backup

[Tump]

Check out the Victron Quattro inverters w/ a 10k inverter w/100 pass thru 
relay. they also have some really well thought out BMS for use w/ their LiFeP04 
batteries and monitoring equipment.
> On Jan 8, 2019, at 3:49 PM, August Goers  wrote:
> 
> Hi Wrenches,
> 
> We have a new potential client who wants a 60 kW PV system and a battery 
> backup system with 200 kWh of storage. The system will be grid tied and the 
> client insists on some sort of lithium battery technology and doesn't want 
> Tesla. For such a ridiculously large system, what kind of equipment would you 
> recommend? I'm thinking maybe Sunny Islands with Blue Ion LiFePO4 batteries?
> 
> Best, August
> August Goers
> 
> Luminalt Energy Corporation
> 
> 
> 
>  
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Re: [RE-wrenches] Equipment ideas for very large residential PV and battery backup

[Mac Lewis]

Hi Jay,

The large 3 phase SMA off-grid that we did actually used Midnite charge
controllers and the MN-SMA comm adapter. It has worked well for us.

I believe that you can use the SB X.X line in off grid applications.

On Wed, Jan 9, 2019, 2:51 PM jay  HI Mac,
>
> I wondering if you know which SMA  GT inverters communication with the SI?
>
> thx
>
> jay
>
>
>
> On Jan 8, 2019, at 1:02 PM, Mac Lewis  wrote:
>
> Hi August,
>
> The limitation with the Sunny Island, (if you don't go 3 phase), is a quad
> stack of 6048s in a 120/240 system last I checked. I think you can double
> that with your islanded Sunny Boys. The 6048 had a ridiculously high surge
> rating so it can cover pretty high loads.
>
> If you go 3 phase with the multicluster box its above 100 kW.
>
> We have done a 64 kWh Blue Ion and it seems to work extremely well. The
> Sunny Island SOC algorithm and Blue Ion SOC don't track perfectly but both
> are useful.
>
> I think you can stack 10 x 8048 Radians but AC coupling then becomes a
> problem.
>
> Good luck with this.
>
> On Tue, Jan 8, 2019, 3:49 PM August Goers 
>> Hi Wrenches,
>>
>> We have a new potential client who wants a 60 kW PV system and a battery
>> backup system with 200 kWh of storage. The system will be grid tied and the
>> client insists on some sort of lithium battery technology and doesn't want
>> Tesla. For such a ridiculously large system, what kind of equipment would
>> you recommend? I'm thinking maybe Sunny Islands with Blue Ion LiFePO4
>> batteries?
>>
>> Best, August
>>
>> *August Goers*
>>
>> Luminalt Energy Corporation
>>
>>
>>
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Re: [RE-wrenches] Schneider Phone Support

[Matthew Sherald]

Wrenches,

I also had need of tech support from Schneider and was nonplussed when my 
trusty phone number failed to connect to their service desk. I filled out their 
installer form and received a reply email with a number and an un-advertised 
extension. The number gets you the same dead end menu choices but if you dial 
the secret extension you may be placed in contact with a real live tech person. 
Anyway, I also posted my issue via the web form and got a delayed response. 
Good tech support makes a difference when I decide between brands. Schneider 
used to have very good support. I hope they don’t downsize or otherwise 
diminish its effectiveness. The new phone/email routine sure left me a bit 
vexed. 

-Matt

Sent from my iPhone

> On Jan 9, 2019, at 1:21 PM, Ray  wrote:
> 
> Can't help you with the phone support, but the fan running is probably a bad 
> temp sensor on the transformer.  Talk about runaround, you'll probably have 
> to call Schneider support to get the replacement sensor.
> 
> Ray Walters
> Remote Solar
> 303 505-8760
>> On 1/9/19 8:34 AM, Amanda Potter wrote:
>> Hello Wrenches,
>> I am having the same issue.
>> I have Comboxs out there that have the latest firmware, but they haven’t 
>> worked for quite a while and my customers are not happy...
>> And, a SW 4024, three years old with the fans running non stop, no matter 
>> what the temperatures are and they will not warranty.
>> That is what the last email said from Tech Support.
>> 
>> Thoughts?
>> 
>> Thanks ahead of time.
>> 
>> Amanda Potter
>> NABCEP 
>> PV Installation Professional
>> NYSERDA Eligible PV Installer
>> Adirondack Battery & Solar, LLC
>> Potsdam, NY
>> (315) 212-2114
>> 
>> On Jan 9, 2019, at 9:56 AM, drake.chamber...@redwoodalliance.org wrote:
>> 
>>> Hello Wrenches,
>>> 
>>> Does Schneider phone support still exist? I filled out an on line form, as 
>>> a professional, to be able to get phone support. Schneider sent me an email 
>>> with two numbers to call, and neither of them worked. One did not connect 
>>> to anything and the other gave me the original message saying to fill out 
>>> the form for tech support.
>>> 
>>> Using their on-line support has been limited in its usefulness, with a lot 
>>> of runaround. No one there will answer any questions about phone support 
>>> availability.
>>> 
>>> The timing of this is interesting, as I was on the verge of using Schneider 
>>> as my go-to brand for battery based equipment. . One Wrench posting from a 
>>> while back that stuck in my head was, "before buying equipment, call their 
>>> tech support to see how good it is." 
>>> 
>>> Does anyone know if phone support still exists?
>>> 
>>> Thank you,
>>> 
>>> Drake 
>>> 
>>> 
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Re: [RE-wrenches] Equipment ideas for very large residential PV and battery backup

[Jason Szumlanski]

I recently came across Racepoint Energy out of Massachusetts. They have an
integrated solution in a steel container with 100kWh storage and add-on
storage enclosures. I believe it comes as a UL Listed unit with easy
connections for PV, AC in, and AC out. I have seen it in person while
investigating solutions for a client with similar desires, but my knowledge
of the product and company are limited. I believe the one I saw was 40kW PV
with 100kWh storage.  I see value in pairing the battery with a suitable
inverter/charger in an integrated unit from the factory. Everything should
play together nicely.

Racepoint is part of Savant, a company focused on high-end home controls.

It might not be as ridiculous as you think. There is growing demand for
large battery solutions. While generators remain the most practical
solution in most backup cases I encounter, there is no question that
consumer demand for batteries is high... until they see the price and
understand the limitations, that is.

Jason Szumlanski
Florida Solar Design Group


On Tue, Jan 8, 2019 at 3:49 PM August Goers  wrote:

> Hi Wrenches,
>
> We have a new potential client who wants a 60 kW PV system and a battery
> backup system with 200 kWh of storage. The system will be grid tied and the
> client insists on some sort of lithium battery technology and doesn't want
> Tesla. For such a ridiculously large system, what kind of equipment would
> you recommend? I'm thinking maybe Sunny Islands with Blue Ion LiFePO4
> batteries?
>
> Best, August
>
> *August Goers*
>
> Luminalt Energy Corporation
>
>
>
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Re: [RE-wrenches] Schneider Phone Support

[Ray]

Can't help you with the phone support, but the fan running is probably a 
bad temp sensor on the transformer.  Talk about runaround, you'll 
probably have to call Schneider support to get the replacement sensor.


Ray Walters
Remote Solar
303 505-8760

On 1/9/19 8:34 AM, Amanda Potter wrote:

Hello Wrenches,
I am having the same issue.
I have Comboxs out there that have the latest firmware, but they 
haven’t worked for quite a while and my customers are not happy...
And, a SW 4024, three years old with the fans running non stop, no 
matter what the temperatures are and they will not warranty.

That is what the last email said from Tech Support.

Thoughts?

Thanks ahead of time.

Amanda Potter
NABCEP
PV Installation Professional
NYSERDA Eligible PV Installer
Adirondack Battery & Solar, LLC
Potsdam, NY
(315) 212-2114

On Jan 9, 2019, at 9:56 AM, drake.chamber...@redwoodalliance.org 
 wrote:



Hello Wrenches,

Does Schneider phone support still exist? I filled out an on line 
form, as a professional, to be able to get phone support. Schneider 
sent me an email with two numbers to call, and neither of them 
worked. One did not connect to anything and the other gave me the 
original message saying to fill out the form for tech support.


Using their on-line support has been limited in its usefulness, with 
a lot of runaround. No one there will answer any questions about 
phone support availability.


The timing of this is interesting, as I was on the verge of using 
Schneider as my go-to brand for battery based equipment. . One Wrench 
posting from a while back that stuck in my head was, "before buying 
equipment, call their tech support to see how good it is."


Does anyone know if phone support still exists?

Thank you,

Drake


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Re: [RE-wrenches] Schneider Phone Support

[glenn.b...@glbcc.com]

We tried to use their phone support yesterday from an off grid site whose 
system was down and were directed to their online support services as well.Not 
happy with the results and wasted man hours that ensued as the tech had to 
complete online applications while in questionable cell coverage area. Then 
wait for confirming email. The day was done before we were able to move forward.
Glenn
Sent from my 'smart' phone so please excuse spelling and typos.
-- Original message--From: drake.chamberlin@redwoodalliance.orgDate: 
Wed, Jan 9, 2019 9:56 AMTo: RE-wrenches;Cc: Subject:[RE-wrenches] Schneider 
Phone Support
Hello Wrenches,
Does Schneider phone support still exist? I filled out an on line form, as a 
professional, to be able to get phone support. Schneider sent me an email with 
two numbers to call, and neither of them worked. One did not connect to 
anything and the other gave me the original message saying to fill out the form 
for tech support.
Using their on-line support has been limited in its usefulness, with a lot of 
runaround. No one there will answer any questions about phone support 
availability.
The timing of this is interesting, as I was on the verge of using Schneider as 
my go-to brand for battery based equipment. . One Wrench posting from a while 
back that stuck in my head was, "before buying equipment, call their tech 
support to see how good it is." 

Does anyone know if phone support still exists?
Thank you,
Drake 


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Re: [RE-wrenches] Schneider Phone Support

[drake . chamberlin]

Did you ever get a working phone support number?

- Original Message -
From: "glenn.b...@glbcc.com" 
To:, "RE-wrenches"

Cc:
Sent:Wed, 09 Jan 2019 10:22:35 -0500
Subject:Re: [RE-wrenches] Schneider Phone Support

We tried to use their phone support yesterday from an off grid site
whose system was down and were directed to their online support
services as well.
Not happy with the results and wasted man hours that ensued as the
tech had to complete online applications while in questionable cell
coverage area. Then wait for confirming email. The day was done before
we were able to move forward.

Glenn

Sent from my 'smart' phone so please excuse spelling and typos.

-- Original message--
FROM: drake.chamber...@redwoodalliance.org [1]
DATE: Wed, Jan 9, 2019 9:56 AM
TO: RE-wrenches;
CC: 
SUBJECT:[RE-wrenches] Schneider Phone Support

Hello Wrenches,

Does Schneider phone support still exist? I filled out an on line
form, as a professional, to be able to get phone support. Schneider
sent me an email with two numbers to call, and neither of them worked.
One did not connect to anything and the other gave me the original
message saying to fill out the form for tech support.

Using their on-line support has been limited in its usefulness, with a
lot of runaround. No one there will answer any questions about phone
support availability.

The timing of this is interesting, as I was on the verge of using
Schneider as my go-to brand for battery based equipment. . One Wrench
posting from a while back that stuck in my head was, "before buying
equipment, call their tech support to see how good it is." 

Does anyone know if phone support still exists?

Thank you,

Drake 

 

Links:
--
[1] mailto:drake.chamber...@redwoodalliance.org

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Re: [RE-wrenches] Schneider Phone Support

[Amanda Potter]

Hello Wrenches,
I am having the same issue.
I have Comboxs out there that have the latest firmware, but they haven’t worked 
for quite a while and my customers are not happy...
And, a SW 4024, three years old with the fans running non stop, no matter what 
the temperatures are and they will not warranty.
That is what the last email said from Tech Support.

Thoughts?

Thanks ahead of time.

Amanda Potter
NABCEP 
PV Installation Professional
NYSERDA Eligible PV Installer
Adirondack Battery & Solar, LLC
Potsdam, NY
(315) 212-2114

> On Jan 9, 2019, at 9:56 AM, drake.chamber...@redwoodalliance.org wrote:
> 
> Hello Wrenches,
> 
> Does Schneider phone support still exist? I filled out an on line form, as a 
> professional, to be able to get phone support. Schneider sent me an email 
> with two numbers to call, and neither of them worked. One did not connect to 
> anything and the other gave me the original message saying to fill out the 
> form for tech support.
> 
> Using their on-line support has been limited in its usefulness, with a lot of 
> runaround. No one there will answer any questions about phone support 
> availability.
> 
> The timing of this is interesting, as I was on the verge of using Schneider 
> as my go-to brand for battery based equipment. . One Wrench posting from a 
> while back that stuck in my head was, "before buying equipment, call their 
> tech support to see how good it is." 
> 
> Does anyone know if phone support still exists?
> 
> Thank you,
> 
> Drake 
> 
> 
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[RE-wrenches] Schneider Phone Support

[drake . chamberlin]

Hello Wrenches,

Does Schneider phone support still exist? I filled out an on line
form, as a professional, to be able to get phone support. Schneider
sent me an email with two numbers to call, and neither of them worked.
One did not connect to anything and the other gave me the original
message saying to fill out the form for tech support.

Using their on-line support has been limited in its usefulness, with a
lot of runaround. No one there will answer any questions about phone
support availability.

The timing of this is interesting, as I was on the verge of using
Schneider as my go-to brand for battery based equipment. . One Wrench
posting from a while back that stuck in my head was, "before buying
equipment, call their tech support to see how good it is." 

Does anyone know if phone support still exists?

Thank you,

Drake 


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Re: [RE-wrenches] LiFePo4 vs BOS

[Darryl Thayer]

I see now
Larry and Alex explained one of my problems was low capacty early shut
down. I had the cc set to absorb volts  below 100% and over two years the
battery seemed to lose capacity.  Voc 80 volts solar array The cc absorb 55
volts i was not charging full. The BMS. would never top balance.  After i
removed the battery and put on my power supply at 59 volts for a couple of
days top balance occurred  i have returned battery to service and works
fine.
Alex's point about cells not being balanced.
Larry's point my system never disconnected but ramped down as i approached
absorb volts therefor no BMS disconnection and no voltage spikes.

On Tue, Jan 8, 2019, 12:15 PM Alex MeVay  Hi All,
>
> As Larry said, when a lithium BMS disconnects, this causes a "load
> dump" just like disconnecting a lead-acid battery.  Well-designed
> chargers (solar or otherwise) should be able to handle this without
> damage, though a failing or poorly-designed lithium battery may cause
> this to happen many orders of magnitude more frequently than the
> once-in-a-blue-moon that may occur with Pb systems.  I'd like to share
> some pitfalls we learned back when we made lithium batteries in case
> they are helpful to Dan in making his decision about the Li bank.
>
> 1. Load dump can mean different things to different chargers.  Solar
> MPPTs, (boost MPPTs excluded) won't put out more than the solar Voc.
> For mobile installations that may include alternator charging, a
> "dumped" 12 or 24V alternator may put out 100V plus before the
> alternator has a chance to respond and the field current can decay.
> Mobile systems should have a mechanism to cut the field current before
> popping the BMS relay.
>
> 2. Most chargers are not power supplies, and are designed to have a
> battery attached as the proverbial 900lb gorilla to stabilize the
> output voltage and buffer load transients.  BMSs should be configured
> never to allow chargers and loads to be directly connected without a
> battery present.  With no battery, load dump transients can destroy
> sensitive loads, and brownouts or bus voltage instability is likely.
> Best case is if the BMS has separate controls for charge and load
> relays, but even with one control output, separate relays for chargers
> and loads can prevent many problems.
>
> 3. Related to #2, most modern MPPTs use synchronous rectification in
> their power stage.  This means that, fundamentally, they can pump
> power into the array from the battery just as well as in the "normal"
> direction.  It's only the controls that keep power flowing the correct
> direction.  Let's say a one-relay 24V Li BMS disconnects, leaving
> chargers and loads connected.  Say things brown out to 10V on the bus,
> with the MPPT doing its best to keep things powered, and running from
> 75Vmp on the array.  BMS decides it's time to reconnect, relay closes,
> bus voltage jumps back up to 26V and instantaneously, the MPPT power
> stage is still set for a 7.5:1 ratio, so power will get pumped back
> into the array, trying to push it up to 26V*7.5=195V, and if the MPPTs
> control loop or protection circuits can't respond fast enough, pop go
> the MOSFETs (depending on input rating of the MPPT).  Separate relays
> for chargers and loads should prevent this, as most MPPTs will either
> shut down or go to absorption when the battery is disconnected,
> preventing the high buck ratios and problems on BMS reconnect.
>
> 4. As a side note, we get a fair number of tech support calls from Li
> battery users complaining of over-voltage LED indications, etc. from
> our MPPTs.  Almost invariably, this turns out to be a "don't shoot the
> messenger" situation, where the lithium battery was never balanced at
> the factory (etc.), and is disconnecting, and our controllers are
> notifying the user of the problem.  Usually a little customer
> education (and patience during cell balancing) solves the problem.
>
> Thank you as always, Wrenches, for all the knowledge you share on this
> list.
>
> Alex MeVay
>
> Blue Sky Energy * http://www.blueskyenergyinc.com
> Genasun * http://www.genasun.com
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