Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Grounding solar panels with PIP5048-GK
#1
I just read in the manual that you may not ground solar panels connected to the PIP. Is that right or am I missing something?

From the manual:

WARNING:
Because this inverter is non isolated, are accepted: single crystalline, poly crystalline with class
A rated and CIGS modules. To avoid any malfunctions, do not connect any PV modules with possible current
leakage to the inverter. For example, grounded PV modules will cause current leakage to the inverter. When
using CIGS modules, please be sure NO grounding connection.
CAUTION:
It’s requested to use PV junction box with surge protec tion. Otherwise, it will cause damage on
inverter when lightning occurs on PV modules.


Thanks again for the help in advance.
Reply
#2
I remember reading that some very early (decades ago?) installations had the negative terminal of the solar panel (array) tied to ground. The manual is probably talking about that.
I'm pretty sure grounding the frames of the PV array is not a problem, in fact required for a safe installation.
OffGridInTheCity and Korishan like this post
Modular PowerShelf using 3D printed packs.  40kWh and growing.
https://secondlifestorage.com/showthread.php?tid=6458
Reply
#3
I would think that it means don't take the Grounded leg (weather Pos or Neg) of the Panel and ground it to the inverter. You would still ground the panels to Ground "at" the panel installation, though. But you wouldn't tie that grounding to the house ground. So you would need to install a separate ground rod for the panels.
If ground level installation, each strip of panels on the rack should be grounded each. Meaning if you had 10 panels, for example, and 5 on one installation rack, and 5 on the other, then you'd need 2 ground rods. But these two ground rods could be bonded together.
If roof mount installation, then the panel ground rods would probably need to be on the opposite side of the house of the house's ground rod. As the inverter "is" still grounded on the AC side of things. However, this I am not fully sure of.

Maybe you could contact Customer Service and ask them and then let us know what they say. This would help many others in the future with their installations, including mine. I hadn't thought about the grounding issue. Though I haven't gotten to that stage myself.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
(this chat is not directly affiliated with SecondLifeStorage; VALID email req'd)
Reply
#4
What could happen when I don't ground the Panels? Nothing when everything is good but if a failure occurs an electric shock?
Reply
#5
(01-06-2020, 12:58 PM)Korishan Wrote: I would think that it means don't take the Grounded leg (weather Pos or Neg) of the Panel and ground it to the inverter. You would still ground the panels to Ground "at" the panel installation, though. But you wouldn't tie that grounding to the house ground. So you would need to install a separate ground rod for the panels.
If ground level installation, each strip of panels on the rack should be grounded each. Meaning if you had 10 panels, for example, and 5 on one installation rack, and 5 on the other, then you'd need 2 ground rods. But these two ground rods could be bonded together.
If roof mount installation, then the panel ground rods would probably need to be on the opposite side of the house of the house's ground rod. As the inverter "is" still grounded on the AC side of things. However, this I am not fully sure of.

Maybe you could contact Customer Service and ask them and then let us know what they say. This would help many others in the future with their installations, including mine. I hadn't thought about the grounding issue. Though I haven't gotten to that stage myself.

>What could happen when I don't ground the Panels? Nothing when everything is good but if a failure occurs an electric shock?
Panels and the metal framework to which they are attached must be bonded-grounded. Very dangerous to skip this.

I have read a great deal about 'grounding' and the info is all over the place.   Some articles suggest that multiple grounding rods can actually cause current in the ground between them that is not so safe...   which is why its better to tie into the main house ground... but I don't say this with any authority.     

What I can say with authority is that my PV array (and metal framework) per city code (Southern OR) and electrician that worked on it - is tied into house ground instead of separate grounding rod. And don't forget the lightning arrestors - they seem like a very sane precaution as well. I've spent $100(s) on them so I certainly hope so Smile

The Reliable converter (cheap ones) with US 120v (single phase) output warn against connecting their inverter to house ground - I presume because of some kind of electronics design.   On one of them I ignored their warning and connected it to house ground and it promptly 'quit working'.    So there may be some electrical design? that doesn't like house ground connected? My AIMS inverter does not have this problem.

I'll be interested to hear what you ultimately do or find out.
Korishan likes this post
Reply
#6
The inverter itself has a connection to house ground. Just unsure what to do with the panels?
Reply
#7
In some areas you need to ground the alu casing of the panels by regulation. ;Check that up if so is the case.
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
Reply
#8
(01-06-2020, 04:53 PM)Maniac_Powerwall Wrote: The inverter itself has a connection to house ground. Just unsure what to do with the panels?
Here's my DIY ground array using universal strut.   Used grounding lugs w/self-taping screws to weave the grounding wire from panel to panel and strut to strut so panels are bonded to each other and the universal struts they are attached to. The universal struts are bonded to the 2" steel framework.  The wire is 6awg - approved in my jurisdiction - and tied in with regular house ground.  
Reply
#9
Ah perfect. I need to check with my electrician. Not very much knowledge about house electric so far.

I got an Answer from MPP Solar. Panels frames can be grounded. They also suggest that. But there are panels wich have positive connection to ground. Those are not suitable with the PIP.
Reply
#10
Exactly. As Long as the panel isnt grounded via its Power Line its fine. Most of Them Arent so. Just stick to local regulations then Egarding grounding
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
Reply


Forum Jump:


Users browsing this thread: 1 Guest(s)