Re: [RE-wrenches] Flashing vs Sealant... again (is sealant code defensible?)

Glenn, I understand where you are coming from, However My concern is that flashings could be worse. Unless the flashing design supports sealant + flashing, it will most likely be worse. I've never seen a L-foot leak, but I've seem many flashings that rely on gravity leak. An L-foot sealed

[RE-wrenches] Flashing vs Sealant... again (is sealant code defensible?)

, other than the appearance of code defensibility. Anybody have proof? thanks, Troy Harvey - Principal Engineer Heliocentric 801-453-9434 tahar...@heliocentric.org ___ List sponsored by Home Power magazine List Address: RE-wrenches

Re: [RE-wrenches] Busbar 120% rule

work on these days is over 120%. So how is everyone else dealing with this? thanks, Troy Harvey On Mar 28, 2014, at 8:38 PM, Bill Brooks billbroo...@yahoo.com wrote: Dave and Troy, I don’t think JW had his facts correct on this. The standard test for a busbar is to place the highest

Re: [RE-wrenches] Busbar 120% rule

manufacturers have stated that these panels cannot pass UL listing tests with those excessive thermal loads. On 2014/3/27, 14:34, Troy Harvey wrote: I am wondering about the busbar 120% rule, and if there is any wiggle room in the 2014 NEC. Fundamentally I don't understand the 120% rule. If my

[RE-wrenches] Busbar 120% rule

would you say that the 120% is based on the inverter max output or backfeed breaker size? thanks, Troy Harvey - Principal Engineer Heliocentric 801-453-9434 tahar...@heliocentric.org ___ List sponsored by Home Power magazine

Re: [RE-wrenches] Long transmission line inductance and LED light flicker

Thanks for your suggestions. I wanted to get ideas before heading out the site since it is 4 hours away and in the middle of nowhere with no local resources! I'll followup once I go visit. thanks, Troy Harvey - Principal Engineer Heliocentric 801-453-9434 tahar

Re: [RE-wrenches] Long transmission line inductance and LED light flicker

circuits which are already doing a bit of magic to turn TRIAC waveforms into a DC constant current. thanks, Troy Harvey - Principal Engineer Heliocentric 801-453-9434 tahar...@heliocentric.org On Feb 3, 2014, at 8:33 AM, Richard L Ratico richard.l.rat...@valley.net wrote

[RE-wrenches] Long transmission line inductance and LED light flicker

. Has anyone dealt with this issue successfully (other than switching to incandescent lights)? Would a static capacitor bank at the house do the trick, or do we need some type of active PFC? And if static did you have any issues with constant power draw from the capacitors? Troy Harvey

Re: [RE-wrenches] Defective modules-Chinese crap?

by manufacturer, like these for canadian solar and Yingli: http://www.warrantyweek.com/archive/ww20111208.html (notice they do creep up a bit around 2009, Yingli doesn't look as good as CSI) Troy Harvey - Principal Engineer Heliocentric 801-453-9434 tahar...@heliocentric.org

Re: [RE-wrenches] Dual Channel Inverters; Hosed By Fronius

at the micro inverter. Then I have to put the array back together. Its an all day activity for two people for 1 inverter. And then I have to do it on the same array the next year again. With a string inverter the swap is simple. thanks, Troy Harvey - Principal Engineer

Re: [RE-wrenches] Dual Channel Inverters; Hosed By Fronius

Why would you rip apart an array? We only remove one module in almost every case, replace the WEEBs, replace the inverter, and we're done. If there are more than two rows of modules, you might need to remove an additional module or two, but that takes almost no time. Our steepest roofs

Re: [RE-wrenches] Enphase / Inverter failures

All of my enphase failure are in the desert (Utah) We have had Power-one units in the field for 5 or 6 years. - Troy Harvey On May 9, 2013, at 10:28 AM, August Goers aug...@luminalt.com wrote: This is fascinating - the majority of the Enphase failures reported on this list seem

[RE-wrenches] Dual Channel Inverters

it is still around. thanks, Troy Harvey - Principal Engineer Heliocentric 801-453-9434 tahar...@heliocentric.org ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address settings

Re: [RE-wrenches] Dual Channel Inverters

consumption. And really if they are going near net-zero, we should only commend them. thanks, Troy Harvey - Principal Engineer Heliocentric 801-453-9434 tahar...@heliocentric.org___ List sponsored by Home Power magazine List Address

Re: [RE-wrenches] Dual Channel Inverters

reliability, with an inverter that has a 1 or 2-sigma reliability. thanks, Troy Harvey - Principal Engineer Heliocentric 801-453-9434 tahar...@heliocentric.org ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re

Re: [RE-wrenches] Fuse sizing in battery circuits

Ray, One thing I didn't understand is how you can pair a 400 amp class-T fuse with a 4/0 cable. The 400 fuse curve looks like the continuous rating is 350A in the graph supplied by Allan. Which is well above the 4/0 ampacity of 250A (copper). Anyone want to explain? thanks, Troy Harvey

Re: [RE-wrenches] Fuse sizing in battery circuits

Allan, that is a good graph. Thanks. The time vs current is way different than whst I've seen from fuse charts in the past. I'd rather use DC-breakers, but I'm having trouble finding 350AMP DC breakers for 350MCM cable. Any resources? thanks, Troy Harvey - Principal

[RE-wrenches] Fuse sizing in battery circuits

will be under-protected for its ampacity rating. Any thoughts on the catch-22? thanks, Troy Harvey - Principal Engineer Heliocentric 801-453-9434 tahar...@heliocentric.org ___ List sponsored by Home Power magazine List Address

[RE-wrenches] Soladeck Alternatives

across? thanks, Troy Harvey - Principal Engineer Heliocentric 801-453-9434 tahar...@heliocentric.org ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address settings: http

Re: [RE-wrenches] Soladeck Alternatives

The zilla flashing looks perfect. Thanks! thanks, Troy Harvey - Principal Engineer Heliocentric 801-453-9434 tahar...@heliocentric.org On Mar 25, 2013, at 1:37 PM, Aaron Mandelkorn reoso...@gmail.com wrote: I believe that Zilla and Quick Mount makes flashed options

Re: [RE-wrenches] Roof flashings on L-feet in high snow load conditions

Ray, we engineer every system using the ASCE structural load manual. Roof snow load has to be below 113 SQFT (for high snow load modules) after taking the ASCE slippery surface reductions based on slope. thanks, Troy Harvey - Principal Engineer Heliocentric 801-453-9434

Re: [RE-wrenches] Roof flashings on L-feet in high snow load conditions

that some shingles out there are just not that good. When facing 100 feet in a residential install, the chances of ripping shingles in my mind needs to be balanced with the benefits... I am not all that certain of which is really higher risk. thanks, Troy Harvey - Principal

Re: [RE-wrenches] Roof flashings on L-feet in high snow load conditions

always goes downhill, right? Well not always, in ice dams, water often goes uphill. There is a real question as to whether a modern sealant system is better or worse than a flashing. I'd like to see data. thanks, Troy Harvey - Principal Engineer Heliocentric 801-453-9434 tahar

[RE-wrenches] Roof flashings on L-feet in high snow load conditions

experience? thanks, Troy Harvey - Principal Engineer Heliocentric 801-453-9434 tahar...@heliocentric.org ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options settings: http://lists.re

[RE-wrenches] Enphase failures

are thousands of times more durable than the inverters. What is your experience? thanks, Troy Harvey - Principal Engineer Heliocentric 801-453-9434 tahar...@heliocentric.org ___ List sponsored by Home Power magazine List Address: RE

Re: [RE-wrenches] Forward re: NABCEP Stamp

I think that Bill has summed it up very well. Stamps on plans generally imply the review of a duly recognized engineer. NABCEP Certification is not an equivalency to being a PE. Confusion with an engineer is my main concern (although I'm a EE, like most not a PE). However there are a lot

Re: [RE-wrenches] Nabcep Stamp

Either way both are just tests, and both are just there solely for the formality of AHJ. I've done enough hiring of engineers to be thoroughly unconvinced any testing, certification, GPA, degree level makes any indication of level of ability. I remember a time a few years back when i hired a

[RE-wrenches] NABCEP Stamp

I am wondering if anyone has had a NABCEP stamp made to stamp plans. I have a city agency who is comfortable with the NABCEP certification as a qualification, but would like to see a stamp. Has anyone out there done this? Troy ___ List sponsored by

[RE-wrenches] Rooftop DC disconnects

I am being told we need rooftop DC disconnects for a 6 string commercial solar install, instead of DC disconnects in the mech room. I don't see anything about this in the NEC. Any truth to this? thanks Troy Harvey - Heliocentric 801-453-9434 tahar...@heliocentric.org

[RE-wrenches] Solar Combi-systems: Heat dump or Stagnate?

. Does anyone have experience with this? Troy Harvey - Heliocentric 801-453-9434 tahar...@heliocentric.org ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options settings: http

Re: [RE-wrenches] Solar Combi-systems: Heat dump or Stagnate?

That's exactly the process. Not surprising since they are a german company. Anybody have the Schuco install reference materials? Troy Harvey - Heliocentric 801-453-9434 tahar...@heliocentric.org On Apr 23, 2009, at 1:53 PM, Tump wrote: Review Schuco panels they use

Re: [RE-wrenches] Mounting to metal roofs and thermal expansion

cause buckling at the seams, and thus leak? Troy Harvey - Heliocentric 801-453-9434 tahar...@heliocentric.org On Feb 6, 2009, at 11:22 AM, Matt Tritt wrote: It is my current understanding that some manufacturers of metal roofing will not warranty their products

Re: [RE-wrenches] Enphase Micro Inverter Energy System

did was mount the inverter on two inverted L-feet. Worked really nicely, no tolerance problems. Troy Harvey - Heliocentric 801-453-9434 tahar...@heliocentric.org ___ List sponsored by Home Power magazine List Address: RE

[RE-wrenches] Mounting to metal roofs and thermal expansion

seal to the metal roof. Troy Harvey - Heliocentric 801-453-9434 tahar...@heliocentric.org On Feb 5, 2009, at 10:14 PM, Greg Egan wrote: Jeff, Joel, William and all, Thanks for all the input. I think the general consensus is that giving out wholesale price information

[RE-wrenches] Trading federal tax credits?

credits? Any other creative finance mechanisms through a solar investment bank that can take the credits? Troy Harvey - Heliocentric 801-453-9434 tahar...@heliocentric.org ___ List sponsored by Home Power magazine List Address: RE

[RE-wrenches] solar hot water penetration flashing

Any thoughts on how to flash a copper pipe roof penetration on a metal roof. The brazed copper flashing we typically use would cause corrosion with the steel roof I'm afraid. WHat have others used in this situation? Troy Harvey - Heliocentric 801-453-9434 [EMAIL