[RE-wrenches] Handy Map for ASHRAE temperatures

Hi all, My awesome coworker James converted the ASHRAE temperature data in the back of the Solar ABCs expedited permitting guide from a spreadsheet into a map format. Thought I'd run it by the list to see if there are any changes you'd recommend (probably best if you reply to me off-list).

Re: [RE-wrenches] Trace TM500

The biggest difference between the two meters is the TM500 uses a RJ11 plug and telephone style cable between a shunt board and the meter. Since amphour meters work by measuring voltage drop across the shunt my guess would be that the meter has lost connectivity to the shunt, probably through

Re: [RE-wrenches] Trace TM500

Hi Phil, I can see how that might cause problems so I will try that fix. While I'm not sure how higher resistance would cause the lack of resetting the amphours back down to zero from the positive territory it can go into during the charging cycles, I have certainly seen lots of funny behavior

Re: [RE-wrenches] To insulate a battery bank DEPENDS on a lot of factors.

One AHJ actually got me on this with sealed batteries. I've blown the seal out overcharging a sealed battery too, so this is a real possibility. The venting requirements are not near as stringent though as for a flooded cell. Article 480 says we need to prevent the build up of explosive gases,

Re: [RE-wrenches] To insulate a battery bank DEPENDS on a lot of factors.

Wrenches, Thanks for all the input on insulated vs. non insulated battery banks. I was setting up my 48VDC HUPS at my new off grid home when the thread started and read all posts with interest. Two weeks past and I feel much better educated about this subject, but ironically still don't know

Re: [RE-wrenches] To insulate a battery bank DEPENDS on a lot offactors.

Hi Nathan, Your assumption was spot on. This list contains lots of folks who have hauled and installed more lead than I. Moreover, as the thread has revealed, the variables are pretty dramatic by location. I am off to write a campaign speech as this sounds like pretty good duck cover!

[RE-wrenches] Battery Venting

Fellow Wrenches, The discussion about battery venting reminds me of a useful and inexpensive program, BattMV, for determining ventilation requirements per EN-50272. EN-50272 is a European standard used to determine how much air flow is needed for a room, I don't know of a equivalent standard

[RE-wrenches] Fire Fighters

Hello, I was reading about fire fighters and their interactions with PV in the last issue of solar pro. Does anyone have experience with basic fire fighter PV training? I would like to try it with my local departments. Jesse Sent from my iPad!!!

Re: [RE-wrenches] Another PV fire

Has any information become available about this fire? Mark Frye Berkeley Solar Electric Systems 303 Redbud Way Nevada City, CA 95959 (530) 401-8024 http://www.berkeleysolar.com/ www.berkeleysolar.com _ From: re-wrenches-boun...@lists.re-wrenches.org

Re: [RE-wrenches] Another PV fire

Mark: I posted an update on 11/14/10. If you can't find it, let me know off-line. William At 12:42 PM 12/14/2010, you wrote: Has any information become available about this fire? Mark Frye Berkeley Solar Electric Systems 303 Redbud Way Nevada City, CA 95959 (530) 401-8024

Re: [RE-wrenches] To insulate a battery bank DEPENDS on a lot of factors.

I'll agree with you, Dana, although I think setting the batteries in the ground will help in more of the cases. Battery optimum temperature is actually lower than the standard test temp of 25C (77F). When you overlay the graph showing increased cycle life of batteries at lower temps with the

Re: [RE-wrenches] Fire Fighters

Hello Jesse; I wrote that article for Solar Pro. The official bottom line curriculum for firefighters is available by free download from CalFire here: http://osfm.fire.ca.gov/training/photovoltaics.php I do teach an IREC/ISPQ accredited class on the topic, to teach professional PV

Re: [RE-wrenches] Fire Fighters

Sent from my iPad!!! On Dec 14, 2010, at 2:40 PM, Dana d...@solarwork.com wrote: Is there a program or format that could be forwarded to a small town fire department? Dana Orzel Great Solar Works, Inc E - d...@solarwork.com V - 970.626.5253 F - 970.626.4140 C - 970.209.4076 web -

[RE-wrenches] clear modules

HI All, Say I've got a client looking to do a clear backed module with a carport idea. Any systems out there ready to go? ( ie with racking and sealing etc_ thanks, jay peltz power ___ List sponsored by Home Power magazine List Address:

Re: [RE-wrenches] Handy Map for ASHRAE temperatures

Jesse, The map is in degrees C not F and it is for the mean extreme minimum drybulb temperature from the ASHRAE Fundamentals 2009 edition. It is a statistical lowest expected temperature for calculating the maximum voltage of a PV array. Bill. -Original Message- From:

Re: [RE-wrenches] Handy Map for ASHRAE temperatures

I saw that right after I sent it! Thanks for the information. Jesse Sent from my iPad!!! On Dec 14, 2010, at 7:23 PM, Bill Brooks billbroo...@yahoo.com wrote: Jesse, The map is in degrees C not F and it is for the mean extreme minimum drybulb temperature from the ASHRAE Fundamentals 2009

Re: [RE-wrenches] clear modules

Check out Silicon Energies modules. http://www.silicon-energy.com/ They have a great module for car-port installs. Jesse Sent from my iPad!!! On Dec 14, 2010, at 6:30 PM, jay peltz j...@asis.com wrote: HI All, Say I've got a client looking to do a clear backed module with a carport

Re: [RE-wrenches] Fire Fighters

Dan, I recently installed a 4.6 KW system with TIGO maximizers http://www.tigoenergy.com/index.html at each PV, wired in with MC4's. A Gateway (mounted centrally amidst the PVs) communicates wirelessly with each maximizer, then relays (via cat5) status, info to the Maximizer