Re: [RE-wrenches] Rapid Shutdown Compliance

1. I use a MLPE residential ground-mounted solution - rapid shutdown or not. w/Accessible MLPE. 2. There is a maximum physical string length for me to keep in mind, for instance, found here: "In the context of this document, string length refers to the number of optimizers and modules in the

Re: [RE-wrenches] Rapid Shutdown Compliance

I was told at a training a couple years ago that there were going to be some modules coming out soon that had a microchip in the module junction box which would replace the diodes and effectively work as MLPE. I have not heard anything about that recently though. Does anyone know what I am talking

Re: [RE-wrenches] Name that Racking

Snap n rac series 200 > On Apr 30, 2020, at 12:17 PM, Dave Tedeyan > wrote: > > Hi All, > Does anyone know what kind of racking is shown in the attached photos? > I just need to get a few midclamps to add a couple modules, but have not seen > it before. > Thanks! >

Re: [RE-wrenches] Rapid Shutdown Compliance

Since I only work with off-grid systems, I find the 690.12 exception starting in NEC 2017 for ground-mounted systems with DC equipment in a separate structure intended only for PV components, is very useful for avoiding expensive, unneeded RSS equipment. Many folks don't like the idea of a battery

Re: [RE-wrenches] Rapid Shutdown Compliance

I would like to see real data on the fire risk of string inverters. Anecdotal problems are not data. The industry is definitely heading toward MLPE due to the rapid shutdown requirements. In many cases MLPE makes sense, in other cases it doesn't. Systems that are more cost effective and

Re: [RE-wrenches] Rapid Shutdown Compliance

I agree w/ Ray as most of my work is Off grid. Incorporating addition failure points ( RSD modules. optimizers ect.) for a system that is usually quite a distance from service, be it my service or the fire departments, I find the justification very hard. Ive replaced your micro inverters at 0*

Re: [RE-wrenches] Rapid Shutdown Compliance

All - Ray has a good point, the discussion here is really about two different types of systems - mainstream ongrid PV, and small scale (and a relatively small market) offgrid PV. It's really tough to design a small offgrid system (especially DC coupled) with rapid shutdown. I think it's just a

Re: [RE-wrenches] Rapid Shutdown Compliance

Deadline for 2023 NEC® public input is in September. Brian > On Apr 30, 2020, at 7:12 AM, Ray wrote: > >  > Hi Jerry; > > This isn't about us not being willing to learn the tech. All of us are > constantly learning about new code changes, new inverters, and solar modules > that change

Re: [RE-wrenches] Rapid Shutdown Compliance

Hi Jerry; This isn't about us not being willing to learn the tech.  All of us are constantly learning about new code changes, new inverters, and solar modules that change specs every few months.  We are voluntarily adopting new technology (like Lithium Ion batteries) when that technology is

Re: [RE-wrenches] Outback EQ not holding voltage

Howie, The timer does not reset when voltage dips below EQ, it just stops counting. So sometimes after 3 hours of EQ, the timer may have only counted down 30 minutes. Jay, I did try lowering the EQ voltage. When it was set to 62V, the voltage would hover at 62.0 and 61.9, then when it was lowered

Re: [RE-wrenches] Rapid Shutdown Compliance

Wrenches We are taking two very different issues and mixing them together. RSD and Arc-fault are different, arc fault will and does prevent fires, RSD was brought out of the need to vent a roof that even with the meter pulled have 500 volts and resulted shocks to fire fighters by cutting into