[RE-wrenches] Discharging a high voltage battery

[Drake]

What about the limit on current that can be put 
on a string into a Sunny Boy? The battery will provide thousands of amps.

At 06:31 PM 2/23/2017, you wrote:
>Hi Larry,Â
>
>I doubt the MPPT algorithm would be able to 
>actually vary the voltage of the battery bank 
>like it can the PV string.  Also, I think that 
>the actual MPP of a battery bank would be much 
>higher amperage than the inverter could 
>export.  It would be an interesting to see if 
>it would just max out the exported amperage or 
>if something else would happen.  I'll donate 
>some older non-code compliant Sunny Boys if you want to try it. Â
>
>
>
>
>On Thu, Feb 23, 2017 at 4:14 PM, Starlight Solar 
>Power Systems 
><<mailto:larry at starlightsolar.com>larry at starlightsolar.com> wrote:
>Hello August,
>
>Help me understand your point. If the MPPT 
>circuit is sweeping, it will see the same 
>voltage everywhere. Would it not just continue 
>sweeping because it can’t lock on? Or perhaps 
>it times out? As long as it is producing power 
>during that process, won’t it be fine?Â
>
>Thanks to all for the responses.Â
>
>Larry
>
>
>
>
>On Feb 22, 2017, at 1:04 PM, August Goers 
><<mailto:august at luminalt.com>august at luminalt.com> wrote:
>
>Larry –
>
>Â
>My immediate thought is that you would need a 
>listed grid tied inverter designed for the 
>purpose of connecting to this type of battery 
>and inverting to the grid. A regular PV inverter 
>won’t cut it since it is designed to MPT PV modules.Â
>
>Â
>The SolarEdge StorEdge product sounds like the 
>closest thing on the market that might be close 
>to working. But, once again, it needs to be 
>setup to work with your particular battery. I 
>think StorEdge is planning on working with Tesla 
>and LG Chem RESU batteries in the 350 to 400 v range.Â
>
>Â
>August
>
>Â
>From:Â RE-wrenches 
>[mailto:re-wrenches-bounces at lists.re-wrenches.org]Â 
>On Behalf Of Starlight Solar Power Systems
>Sent:Â Wednesday, February 22, 2017 11:17 AM
>To:Â RE-wrenches
>Subject:Â [RE-wrenches] Discharging a high voltage battery
>
>Â
>Hello Wrenches,
>
>Â
>Someone has asked me about discharging their EV 
>battery into the grid. They have an existing 
>grit tie system. What they want to do is connect 
>a 5kW grid tie inverter to their 340 volt, 32kWh 
>EV battery bank and feed the grid to discharge 
>the battery. Why was not discussed but sure bugs me.Â
>
>Â
>My uneducated guess is the inverter will be 
>immediately damaged. My thought is how would it 
>limit the input current? Or, is there such an 
>inverter available that can do the job?
>
>Â
>Any input is appreciated.Â
>
>Larry Crutcher
>Starlight Solar Power Systems
>
>Â
>Â
>
>Â
>_______________________________________________
>List sponsored by Redwood Alliance
>
>List Address:Â 
><mailto:RE-wrenches at lists.re-wrenches.org>RE-wrenches at lists.re-wrenches.org
>
>Change listserver email address & settings:
><http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org>http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
>List-Archive:Â 
><http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html>http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>
>List rules & etiquette:
><http://www.re-wrenches.org/etiquette.htm>www.re-wrenches.org/etiquette.htm
>
>Check out or update participant bios:
><http://www.members.re-wrenches.org/>www.members.re-wrenches.org
>
>
>_______________________________________________
>List sponsored by Redwood Alliance
>
>List Address: 
><mailto:RE-wrenches at lists.re-wrenches.org>RE-wrenches at lists.re-wrenches.org
>
>Change listserver email address & settings:
><http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org>http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
>List-Archive: 
><http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html>http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>
>List rules & etiquette:
><http://www.re-wrenches.org/etiquette.htm>www.re-wrenches.org/etiquette.htm
>
>Check out or update participant bios:
><http://www.members.re-wrenches.org>www.members.re-wrenches.org
>
>
>
>
>
>--
>
>
>
>Mac Lewis
>
>"Yo solo sé que no sé nada." -Sócrates
>_______________________________________________
>List sponsored by Redwood Alliance
>
>List Address: RE-wrenches at lists.re-wrenches.org
>
>Change listserver email address & settings:
>http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
>List-Archive: 
>http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>
>List rules & etiquette:
>www.re-wrenches.org/etiquette.htm
>
>Check out or update participant bios:
>www.members.re-wrenches.org


---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20170225/06aec136/attachment-0003.html>