The IET is carrying out some important updates between 17-30 April and all of our websites will be view only. For more information, read this Announcement

Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 3 replies
  • Subscribers 31 subscribers
  • Views 3146 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

PV solar Panel isolation

Webbix
Hi All

i have a job where the roofer wants to move some solar panels on a roof on some flats 4 sets of panels (for 4 flats) do some remedial works then refit. My question is if i lock off the DC isoator in each flat , do i also lock off the AC isolator for each falt as well . Also if the DC isolator is locked off what stops the roofer getting a schock directly from panel on roof ! appreciate some guidance

thanks in advance

Paul
Parents
  • 0
    I agree with Mike’s comments.

    Before starting work the array should be into open circuit by isolating the inverter at AC, then DC. On a larger system, I would be inclined to use a clamp meter to check nothings flowing that shouldn’t be via leakage paths... Do not attempt to pull apart cable connectors if there’s a chance that current is flowing as the arc will cause damage.

    Obviously check the series/parallel configuration in the documentation before you start so it goes back the same way.

    I would recommend string testing in accordance with BSEN62446 before the modules are removed and on reinstatement and comparing with design values, or at least each other.

    Has the roofer worked with PV before? Do note that modules are more fragile than they appear and microcracking can arise from rough treatment / pressure (crawling over them) / overtightening clamps that may not be visible at the time but will affect performance later.
Reply
  • 0
    I agree with Mike’s comments.

    Before starting work the array should be into open circuit by isolating the inverter at AC, then DC. On a larger system, I would be inclined to use a clamp meter to check nothings flowing that shouldn’t be via leakage paths... Do not attempt to pull apart cable connectors if there’s a chance that current is flowing as the arc will cause damage.

    Obviously check the series/parallel configuration in the documentation before you start so it goes back the same way.

    I would recommend string testing in accordance with BSEN62446 before the modules are removed and on reinstatement and comparing with design values, or at least each other.

    Has the roofer worked with PV before? Do note that modules are more fragile than they appear and microcracking can arise from rough treatment / pressure (crawling over them) / overtightening clamps that may not be visible at the time but will affect performance later.
Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines