The lightning subject is always interesting.
My house is steel framed posts into concrete and a concrete slab onto ground for part of it. Stand alone system with a generator in another shed 50m away. Its A/C electrical system is earthed to Australian standards, I assume, as it was done by qualified electricians.
there is nothing special done for lightning protection.
In over 10 years I have had problems from lightning from surge coming in the copper phone lines, or through the ground blowing computers etc.
There have been a lot of really, really close lighting strikes, but not a direct hit on the house or I think it would frazzle everything and probably melt the house??
I have been zapped sitting at the desk from surge coming through the phone line or the ground.
But neither panels, charge controllers or inverter have ever been damaged but any lighting surge.
Off-grid solar panel hit by lightning and not charging
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Amend to read Backflow diode function provided by the Charge Controller. The controller can use many methods to achieve this function.
(Diode, MOSFET, relay, magic...)
What's inside the PV panel J-box, is the 2 or 3 Bypass Diodes, in case shade falls on some or all of the panel.Leave a comment:
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(Diode, MOSFET, relay, magic...)
What's inside the PV panel J-box, is the 2 or 3 Bypass Diodes, in case shade falls on some or all of the panel.
Leave a comment:
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thanks for the help! I've tried to ask electricians where I am, and they are very unhelpful and refuse to help since I'm in a remote area.Last edited by sashaky; 09-17-2018, 02:10 PM.Leave a comment:
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None of it makes any sense whatsoever. But I am only going to comment on your batteries and controllers because it is not worth my or your time to educate you. They are a boat anchors and need re[placed along with all your charge controllers. Before you spend $20,000 replacing Batteries and Controller, I suggest you get a proper working design, or else you will be doing this again in a year or two. .Leave a comment:
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What are you talking about? No modern Charge Controller has backflow diodes. All modern controllers use MOSFET's transistors and like a diode current can only flow in one direction.Leave a comment:
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It sounds like lightning took out your charge controllers, then the batteries have been run down and ruined.
Battery guys chime in.
I would say the first concern is to learn how to survive most lightning. All the panel frames could be grounded
using serious methods such as rebar in concrete, with Cadweld connections to the rebar. That may not be
enough, but you could build a set of overhead wires that surround the array and are well grounded on their
own, to distract direct lightning to the array. Like that extra wire you see on transmission poles, at the top
above all the main conductors. Study and design needed.
Bruce RoeLeave a comment:
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So I looked up my charge controllers: TriStar TS-60, and they don't actually have backflow diodes even though most modern charge controllers do. The PV junction on the back, JM828 PV junction box, contains them. The problem is, they don't have an easily accessible mother board so I'd have to instal them in between the junction box and the charge controller. That's why I was thinking of doing it after the charge controller. The batteries do get up to 52V when they're full, which is around 95% of their manufactured max. I thought and hoped, because of this, they're not toast. I can get backflow diodes for $3 where I am so wanted to try installing those before trashing the whole system.Leave a comment:
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It sounds like lightning took out your charge controllers, then the batteries have been run down and ruined.
Battery guys chime in.
I would say the first concern is to learn how to survive most lightning. All the panel frames could be grounded
using serious methods such as rebar in concrete, with Cadweld connections to the rebar. That may not be
enough, but you could build a set of overhead wires that surround the array and are well grounded on their
own, to distract direct lightning to the array. Like that extra wire you see on transmission poles, at the top
above all the main conductors. Study and design needed.
Bruce RoeLeave a comment:
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We have 30 x 250-watt (38W peak efficiency) solar panels setup in three sets of 10. Each one of these chains of 10 panels is hooked up to one 60-amp charge controller and runs to a battery bank. The battery bank is comprised of 48 x 12v, 200Ah AGM batteries. They are setup as 4 batteries in series to get to 48V and then linked in parallel. Each charge controller (3) is wired to a bank of 16 batteries, or 4 chains of 4 batteries and then these three smaller banks are linked together in parallel to make the whole battery bank. Correct me if I'm wrong, but this would give a battery bank of 48V and 2,400Ah = 115.2kWh. 4 x 12V in series would give 48V and remain at 200Ah and then 12 of these 48V sets would give the 2,400Ah.[LIST=1][*]Does this make the most sense as a setup?Last edited by Sunking; 09-17-2018, 01:04 PM.Leave a comment:
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back flow diodes are in the Charge Controller.
If the system was hit by lightning, consider everything but the batteries, toast.
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Off-grid solar panel hit by lightning and not charging
Hello all,
This is my first post. I've been reading through the forum and have seen some similar posts answered but my situation is a bit tricky. I took over an off grid solar system in Central America. I wasn't here when it was installed, and the installer hasn't left any manuals or wiring charts, so I've been trying to reverse engineer the whole system. So, I have a few questions and any help would be appreciated.
We have 30 x 250-watt (38W peak efficiency) solar panels setup in three sets of 10. Each one of these chains of 10 panels is hooked up to one 60-amp charge controller and runs to a battery bank. The battery bank is comprised of 48 x 12v, 200Ah AGM batteries. They are setup as 4 batteries in series to get to 48V and then linked in parallel. Each charge controller (3) is wired to a bank of 16 batteries, or 4 chains of 4 batteries and then these three smaller banks are linked together in parallel to make the whole battery bank. Correct me if I'm wrong, but this would give a battery bank of 48V and 2,400Ah = 115.2kWh. 4 x 12V in series would give 48V and remain at 200Ah and then 12 of these 48V sets would give the 2,400Ah.- Does this make the most sense as a setup?
- Do the backflow diodes make the most sense as the issue? My thinking is, they're discharging when the sun goes down and the LED lights in the inverter screen blew out, which are the most common indicators of a non-functioning blocking diode.
- I've never installed a backflow diode but I'm wondering if I can install 3 backflow diodes where each set of 10 solar panels come together in a junction box so that I don't have to install 30 diodes or replace the PV junction box.
Other possibly useful information:
Solar panel's Imp is 8.39A, VMP is 30.4V and maximum system voltage for the panels is 1000V.
I know this might be a little all over the place. If something isn't clear, please let me know and I'll re-explain it more clearly.
Thanks in advance for any help!
SashakyLast edited by sashaky; 09-17-2018, 12:36 PM.
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