Re: [RE-wrenches] SHW?

[Will White]

Chris,

I just saw Heliodyne just came out with a new controller that includes
remote monitoring. I don't know anything about it but you may want to check
it out.

Thanks,
Will

On Thu, May 20, 2021 at 1:12 PM Christopher Warfel <
cwar...@entech-engineering.com> wrote:

> We install pv and SHW. It is now about 75% 25% respectively. Actually just
> commissioned a two collector DB system. After 20 years, it was my first
> DB.  It is working great as of this late morning. I'd like to look into
> online monitoring of these.  We have too many customers that are not here
> enough and overheating the glycol. They swore that they would be here year
> round and we did not put in a thermal dump. Now we do on almost every
> system.  There is good product quality out there.  Chris
> On 5/19/2021 1:11 PM, MiJo Nels wrote:
>
> I wish I could help you Nik. I'm doing everything I can to keep the hot
> water flowing in San Diego for all the legacy Jimmy Carter systems out
> there (in addition to the wonderful new ones). SHW IS ALIVE! and please to
> all my renewable brother's and sister's out there don't forget it's value..
> Thermal is worth your time for so many reasons..
>
> Sent via the Samsung Galaxy S21 5G, an AT&T 5G smartphone
> Get Outlook for Android 
>
> --
> *From:* RE-wrenches 
>  on behalf of Nik Ponzio,
> Building Energy 
> 
> *Sent:* Wednesday, May 19, 2021 9:14:54 AM
> *To:* RE-wrenches 
> 
> *Subject:* [RE-wrenches] SHW?
>
> Anyone on here still doing solar hot water? We have an orphaned system in
> Rutland County, Vermont that needs service. Referrals appreciated.
>
>
> --
> Nik Ponzio
> Building Energy
> http://www.BuildingEnergyVT.com
> 
>
>
>
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> --
>  Christopher Warfel
>  ENTECH Engineering, Inc.
> PO Box 871, Block Island, RI 02807
> 401-466-8978
> 
>
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-- 
*Will White*
Curriculum Developer


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

NABCEP Certified PV Installation Professional
# 093006-34
Do you envision a world powered by renewable energy? Be the change
.
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[RE-wrenches] LiFePo4 Low Temp Charging Damage

[Mark Frye]

Folks,

If I have a charger that does not have low battery charge cut-off, I can 
get in trouble if I have a frozen pack and apply a charging voltage.


But, if I start with a pack that is above freezing and keep a trickle 
charge on it, can I keep that pack safe from freezing and damage?


Or at some point, as ambient temperature drops, the pack will freeze and 
be damaged anyway?


Thanks,

Mark Frye


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Re: [RE-wrenches] LiFePo4 Low Temp Charging Damage

[Dave Angelini Offgrid Solar]

I doubt you will do any good with trickle charging at cold temps.  LFP is
too efficient and there is litlle self heating, so this will not work.

Probably need to use LA or roll the dice. An expensive mistake if you
lose.  Even heating pads need a fossile fuel source in cold country with
LFP powering a home. A duct from a heated home will also work but you need
to keep that home warm and power the duct fan. Not fun if you have to leave
the home for an emergency.


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

On Fri, 21 May 2021 08:44:04 -0700, Mark Frye 
wrote:
> Folks,
> 
> If I have a charger that does not have low battery charge cut-off, I can

> get in trouble if I have a frozen pack and apply a charging voltage.
> 
> But, if I start with a pack that is above freezing and keep a trickle 
> charge on it, can I keep that pack safe from freezing and damage?
> 
> Or at some point, as ambient temperature drops, the pack will freeze and

> be damaged anyway?
> 
> Thanks,
> 
> Mark Frye
> 
> 
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Re: [RE-wrenches] LiFePo4 Low Temp Charging Damage

[Larry]

My personal opinion is that you should not buy any lithium battery that does 
not provide adequate protection for all modes of operation. 

Freezing does not damage the battery; charging a frozen battery may damage it 
quickly. Trickle charging the battery is not the solution.

There are two solutions: provide a heat source to keep the batteries above 
freezing or incorporate a temperature controller to disable the charger if the 
battery is unsafe to charge.

Larry Crutcher


> On May 21, 2021, at 8:44 AM, Mark Frye  wrote:
> 
> Folks,
> 
> If I have a charger that does not have low battery charge cut-off, I can get 
> in trouble if I have a frozen pack and apply a charging voltage.
> 
> But, if I start with a pack that is above freezing and keep a trickle charge 
> on it, can I keep that pack safe from freezing and damage?
> 
> Or at some point, as ambient temperature drops, the pack will freeze and be 
> damaged anyway?
> 
> Thanks,
> 
> Mark Frye
> 
> 
> ___

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Re: [RE-wrenches] LiFePo4 Low Temp Charging Damage

[Ray]

This is the only company I know of that has dealt with the low 
temperature charging issue.  Its a great product, and the blue tooth 
monitoring is an excellent feature too.  This is what the other Li+ 
batteries should be doing.  The big down side is they are currently 
limited to 12v.  Wish they made a 48v pack.


https://www.lifebluebattery.com/rv-boat-low-temperature-lithium-ion-batteries/index.html

Ray Walters
Remote Solar
303 505-8760

On 5/21/21 12:12 PM, Larry wrote:

My personal opinion is that you should not buy any lithium battery that does 
not provide adequate protection for all modes of operation.

Freezing does not damage the battery; charging a frozen battery may damage it 
quickly. Trickle charging the battery is not the solution.

There are two solutions: provide a heat source to keep the batteries above 
freezing or incorporate a temperature controller to disable the charger if the 
battery is unsafe to charge.

Larry Crutcher



On May 21, 2021, at 8:44 AM, Mark Frye  wrote:

Folks,

If I have a charger that does not have low battery charge cut-off, I can get in 
trouble if I have a frozen pack and apply a charging voltage.

But, if I start with a pack that is above freezing and keep a trickle charge on 
it, can I keep that pack safe from freezing and damage?

Or at some point, as ambient temperature drops, the pack will freeze and be 
damaged anyway?

Thanks,

Mark Frye


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Re: [RE-wrenches] SMA SB 2500U

[Glenn Burt]

IEEE standards are not UL standards, and some of the mentioned improvements in 
functionality are NEC requirements, not UL.

Just trying to clarify.

 

From: RE-wrenches  On Behalf Of Kirk 
Herander, VSE
Sent: Tuesday, May 18, 2021 7:04 PM
To: re-wrenches@lists.re-wrenches.org
Subject: Re: [RE-wrenches] SMA SB 2500U

 

"IEEE 1547-1" certification is required at least in the New England ISO 
document which our utilities abide by. IEEE 1547 does not qualify. My local 
utility denied my approval for installation last year of a old SMA2500U 
inverter for this reason. 

 

Kirk Herander / kirkh@vermont.solar  

Owner|Principal, VT Solar, LLC

Celebrating our 30th Anniversary 1991-2021!!

 

 www.vermont.solar

dba Vermont Solar Engineering

802.863.1202

On 5/18/2021 2:07:28 PM, Glenn Burt mailto:glenn.b...@glbcc.com> > wrote:

Hi Kirk,

 

Can you elaborate on which UL standards the older SB units don’t comply with?

 

-Glenn

 

From: RE-wrenches mailto:re-wrenches-boun...@lists.re-wrenches.org> > On Behalf Of Kirk 
Herander, VSE
Sent: Tuesday, May 18, 2021 6:42 AM
To: re-wrenches@lists.re-wrenches.org 
 
Subject: Re: [RE-wrenches] SMA SB 2500U

 

These older Sunnyboys do not comply with latest UL standards regardless. If its 
a new installation, a savvy utility  / AHJ will catch this.

 

Kirk Herander / kirkh@vermont.solar  

Owner|Principal, VT Solar, LLC

Celebrating our 30th Anniversary 1991-2021!!

 

 www.vermont.solar

dba Vermont Solar Engineering

802.863.1202

On 5/17/2021 3:53:26 PM, William Miller mailto:will...@millersolar.com> > wrote:

Jay: 

Some years ago I mis-ordered 5 SB2500s for 208 three phase and it turned 
out the system was 240 VAC three phase (open delta). I had to return the 
inverters to the factory to be converted and I had to rewire all of the 
arrays. So no, I don't think this can be done in the field. 

William Miller 

Miller Solar 
17395 Oak Road, Atascadero, CA 93422 
805-438-5600 
www.millersolar.com   
CA Lic. 773985 


-Original Message- 
From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On 
Behalf Of Jay 
Sent: Monday, May 17, 2021 11:44 AM 
To: RE-wrenches 
Subject: [RE-wrenches] SMA SB 2500U 

Does anyone know if you can convert a 
SMA SB2500U ( old red inverter) from 208 to 240vac? 

Without using a boost transformer. 

Thx 
Jay 

Peltz power. 


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[RE-wrenches] LG chem resu10h gen2

[Kristopher Schmid]

I have installed a number of battery ready systems using StorEdge inverters
without the battery.  I now am left hanging with no gen 2 batteries
available and no compatibility between gen 3 prime batteries and the
StorEdge.  Not happy.

Anyone have a LG gen 2 on the shelf (a very strong shelf).  Contact me off
list if so.

Thanks,
Kris
7156534295
sol...@legacysolar.com
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Re: [RE-wrenches] LiFePo4 Low Temp Charging Damage

[Dave Angelini Offgrid Solar]

I can think of a few other things for the wish list! l
Closed loop charging with multiple sources. 
Robust BMS design to not be a new source of power failures Offgrid.
Spare BMS for sale with product that is servicable.
Gets Soc and temp into Insight and Optics
A company that will be there when I need them. Too many players in the
battery game right now that I do not know of! Only a few that do most all
of these for me.

Friday !

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


On Fri, 21 May 2021 12:24:11 -0400, Ray  wrote:
> This is the only company I know of that has dealt with the low 
> temperature charging issue.  Its a great product, and the blue tooth 
> monitoring is an excellent feature too.  This is what the other Li+ 
> batteries should be doing.  The big down side is they are currently 
> limited to 12v.  Wish they made a 48v pack.
> 
>
https://www.lifebluebattery.com/rv-boat-low-temperature-lithium-ion-batteries/index.html
> 
> Ray Walters
> Remote Solar
> 303 505-8760
> 
> On 5/21/21 12:12 PM, Larry wrote:
>> My personal opinion is that you should not buy any lithium battery that
>> does not provide adequate protection for all modes of operation.
>>
>> Freezing does not damage the battery; charging a frozen battery may
>> damage it quickly. Trickle charging the battery is not the solution.
>>
>> There are two solutions: provide a heat source to keep the batteries
>> above freezing or incorporate a temperature controller to disable the
>> charger if the battery is unsafe to charge.
>>
>> Larry Crutcher
>>
>>
>>> On May 21, 2021, at 8:44 AM, Mark Frye 
wrote:
>>>
>>> Folks,
>>>
>>> If I have a charger that does not have low battery charge cut-off, I
>>> can get in trouble if I have a frozen pack and apply a charging
voltage.
>>>
>>> But, if I start with a pack that is above freezing and keep a trickle
>>> charge on it, can I keep that pack safe from freezing and damage?
>>>
>>> Or at some point, as ambient temperature drops, the pack will freeze
>>> and be damaged anyway?
>>>
>>> Thanks,
>>>
>>> Mark Frye
>>>
>>>
>>> ___
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