We've transitioned from using supply-side taps to using Feeder taps re:
705.12(B) almost exclusively.
The advantages are numerous - and you just added one more - not needing
line side listing on your tap hardware.
One of the most dangerous things I see looming in the present code is
the
SPDs or (MOVs) on the PV input side of a charge controller are not
wired to snub excessive PV voltage.
They are wired from PV+ to GND and the other from PV- to GND and only
the two in series, at double the
MOV clamp voltage would have any effect on clamping the PV+/PV- voltage.
SPDs are
The requirements for power distribution blocks (PDB) to be marked “*suitable
for use on the line side*…” when installed connected in that manner in
wireways (Art. 376) and pull/junction boxes (Art. 314) have been in the
NEC® for quite a few cycles.
It looks like the additions to 230.46 in the
As someone who does 75%+ supply-side interconnections, this kind of
terrifies me. We have another year of NEC 2017 here, so I have time to
prepare, but I'm watching this closely.
Meter disconnects/reconnects here are difficult due to the lack of good
utility company cooperation and the
I have been following this discussion intently. I hate to say it, but it
all sounds like a major case being made for AC-coupled system architecture,
and even integrated "AC Batteries" like Powerwalls and Encharge
that integrate the battery and inverter into listed Energy Storage Systems.
As
Most firefighters are not electrical engineers; nor are most insurance
agents. However both of those groups are stakeholders with influence over
codes and standards. Some may say too much influence, but the fact of the
matter is that code making is a group/consensus process, and very often
none of
On 2/1/2023 2:58 PM, Starlight via RE-wrenches wrote:
Have you (or any) installed surge suppression on the PV input side to
clamp the open circuit voltage surge?
That's not where the issue is and isn't really a solution. As I
explained in my previous e-mail, the issue is the open circuit on
Have you (or any) installed surge suppression on the PV input side to clamp the
open circuit voltage surge?
Larry Crutcher
Starlight Solar Power Systems
On Feb 1, 2023, at 1:23 PM, William Bryce via RE-wrenches
wrote:
I can also backup what Jim has said, and have seen the same gear
I can also backup what Jim has said, and have seen the same gear destroyed
by removing the battery abruptly when the controller is under heavy load.
They can die, and sometimes die spectacularly.
Have seen SolArk inverters integrated MPPT controllers blow up when lithium
battery BMS disconnects.
On 2/1/2023 12:25 PM, Alex MeVay via RE-wrenches wrote:
Although our controllers are probably smaller than what you would be
considering in this discussion, surviving a load dump (suddenly
disconnected battery) is an engineering requirement for us, and likely
would be for other responsible
Hi Esteemed Wrenchies,
Love this discussion.
It is clear to me after many years of watching this that the industry
needs to have an Emergency Shutdown standard that includes an emergency
shutdown of the BMS of every battery as well as the inverter's circuits
including MPPTs if all
> Oh, yeah, the charge controller blowing up thing: Does anyone have any
> factual data to share on this?
Although our controllers are probably smaller than what you would be
considering in this discussion, surviving a load dump (suddenly
disconnected battery) is an engineering requirement for
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