1000w solar panel? Is it even true

[Cosmik Debris]

I've seen 2v Trojan systems that do 6000Amps in home environment, so possible.

Go take a look at powerforum.co.za at some of the older dead acid battery systems.

How thick were those cables? 6000 Amps requires bus bars.

 

[itareanlnotani]

Read the OP. It says it has a systems voltage of 1000 Volts...

No, it doesnt

It says: Maximum system voltage 1000V

 

[Vorastra]

Read the OP. It says it has a systems voltage of 1000 Volts...

Bruh, I wanted to know who @TheChamp was talking about.
I don't care how many volts...

 

[RonSwanson]

Ron, this is for long distance AC transmission. Long distance DC transmission requires thick cables, the reason long distance transmission is via AC, thinner cables and high voltage.

No local authority is going to allow 1000V system distribution in a house. Houses are 220V, Factories 380V and maritime voltages 440V. The Eskom breaker for most houses is 80 Amps but according to some here, their systems are capable of 6000 Amps. Those are industrial power requirements and specialised personnel are required to work with and switch them.

I have a tiny, baby-sized generation system (in comparison to many other homes leave alone businesses), and I have two DC strings running from the roof of my house, to my garage, both averaging around 370 VDC and up to 9 Amps each, feeding the MPPT charge controllers. The MPPT controllers can take up to 500V @13Amps. This is a very common configuration.

I have a tiny array, 6.1kWp. Here are my DC breakers for each string, rated at 1200V DC:


The photograph I posted earlier is the DC DB for a larger residential system, over 14kWp, but basically a microgrid because the designer wanted black start capability.

You seem to suggest that it is illegal / wrong somehow? What law exactly have I broken?

 

[RonSwanson]

What solar panel system can supply 1000 Volts? Power is calculated by P = VI Where:

P - Power in Watt.
V - Volts
I - Amp

Therefore, if you have 1000V for 15kW, the amperage will be 15 Amps.

But if most panels give around 40V, at 15kW you will draw 375 Amps. Far below 6000 Amps.

Wherefore this 6000 Amp breaker?

I don't have a fixation on 1000V. Have a look at the pic in the OP.

You must read properly.

In the photograph, as well as in my earlier explanation, I stated that the single panel is rated at a VoC of 70VDC at STC.

https://imgur.com/p9avrPx

 

[Cosmik Debris]

No, it doesnt

It says: Maximum system voltage 1000V

Exactly. So the system can have a max voltage of 1000V. Which application would that be for? Plus the consensus is that the OP is false on page one. Start reading.

 

[PowerFactor]

With the old and new Telkom logo it must be genuine.

 

[Vorastra]

With the old and new Telkom logo it must be genuine.

We don't care about that any more. Everyone's arguing about who's the best electrician.

 

[TheChamp]

Exactly. So the system can have a max voltage of 1000V. Which application would that be for? Plus the consensus is that the OP is false on page one. Start reading.

A real panel was posted and it had the 1000V system voltage so it doesn't matter if the image in the OP is false, post# 47 and #49.

A 15kW inverter can easily have an input voltage range up to 800V, there is also the cloud edge effect that inverters should cater for hence the high voltage.

 

[RonSwanson]

I don't run it at 1000v, i run it at 450v or so (as efficiency is better in that range).
It could run at a max of 1000v, although it wouldn't be as efficient.


Also just so you know -

All electrical installations on premises must comply with the requirements of SANS 10142 – code of practice for the wiring of premises – part 1. The current code does not specifically address solar installations but does cover DC installations up to 1500 V DC

"low voltage" means the set of nominal voltage levels that are used for the distribution of electricity and whose upper limit is generally accepted to be an a.c. voltage of 1000V (or a d.c. voltage of 1500 V). [SANS 1019]

The limit of 1500 V for DC makes the higher voltage solar PV systems fall within the scope of the code, and no special provisions apply. 1500 V DC systems are thus subject to the same requirements as 1000 V and 600 V systems.

(mostly snarfed from here - https://www.ee.co.za/article/high-voltage-rooftop-solar-developments.html as its been a while since I read the code, and did the install ).


So again, stop talking kak.

That's a good article, thank you.

 

[RonSwanson]

But just remember and ELCB is NOT exactly the same as an RCD.

Ah, now for the learning channel
Please explain @Geoff.D ?

 

[wingnut771]

A real panel was posted and it had the 1000V system voltage so it doesn't matter if the image in the OP is false, post# 47 and #49.

A 15kW inverter can easily have an input voltage range up to 800V, there is also the cloud edge effect that inverters should cater for hence the high voltage.

It's been determined that it doesn't have an effect on voltage but rather the amps.

 

[TheChamp]

It's been determined that it doesn't have an effect on voltage but rather the amps.

When it happens the inverter compensates by clipping the current and raising the voltage, that's why the inverter should not be found wanting when it comes to the voltage.

Reliability in Solar | TMEIC

TMEIC has over 30 years of production and R&D experience in PV market. Cloud Edge Cloud edge effect is a common phenomenon in PV power generation. This effect is caused by sudden increase in irradiance due to reflection of the passing cloud focusing more sunlight to the array. Inverters...

www.tmeic.com

 

[wingnut771]

When it happens the inverter compensates by clipping the current and raising the voltage, that's why the inverter should not be found wanting when it comes to the voltage.

Reliability in Solar | TMEIC

TMEIC has over 30 years of production and R&D experience in PV market. Cloud Edge Cloud edge effect is a common phenomenon in PV power generation. This effect is caused by sudden increase in irradiance due to reflection of the passing cloud focusing more sunlight to the array. Inverters...

www.tmeic.com

What you can do about clouds slashing your solar power

What you can do about clouds slashing your solar power Research shows that a small amount of cloud cover can have a dramatic impact on the amount of power a solar panel produces. Solar Advice director Neil Berrow says there are ways to compensate for South Africa’s cloudy days. According to...

mybroadband.co.za

 

[RonSwanson]

When it happens the inverter compensates by clipping the current and raising the voltage, that's why the inverter should not be found wanting when it comes to the voltage.

Reliability in Solar | TMEIC

TMEIC has over 30 years of production and R&D experience in PV market. Cloud Edge Cloud edge effect is a common phenomenon in PV power generation. This effect is caused by sudden increase in irradiance due to reflection of the passing cloud focusing more sunlight to the array. Inverters...

www.tmeic.com

I wouldn't go as far as to say that the inverter raises the voltage. That's not impossible, but complex to do. But yes, current (amps) can be controlled far easier.

 

[Cosmik Debris]

No, it doesnt

It says: Maximum system voltage 1000V

Exactly. So the system can have a max voltage of 1000V. Which application would that be for? Plus the consensus is that th OP is false on page one. Start reading.

 

[Cosmik Debris]

Yoh. I'm starting to see exactly why the City of Cape Town requires Certificates of Compliance for home solar installations.

Some stuff here is scary and the googling as well.

I will bow out of this now.

 

[TheChamp]

Yoh. I'm starting to see exactly why the City of Cape Town requires Certificates of Compliance for home solar installations.

Some stuff here is scary and the googling as well.

I will bow out of this now.

Bye bye, you really made something out of an otherwise useless thread.

 

[Geoff.D]

Yoh. I'm starting to see exactly why the City of Cape Town requires Certificates of Compliance for home solar installations.

Some stuff here is scary and the googling as well.

I will bow out of this now.

You do that. You have failed to keep up with developments, and have thus missed the theoretical studies done into raising the operating voltage of solar systems that have been in the offing for more than 3 years already.

Incidentally, the use of 24V and 48V/50V DC in telecommunications has been a sore point in the industry for as long as I can remember.

The logic of trying to raise the voltages makes sense precisely because of the calculation you so proudly posted without understanding a damn thing about what it means.

P = I x V. By increasing the voltage, you lower the current in the system and still achieve the same power.

As soon as the PV technology became available, the move was inevitable.

 

[Cosmik Debris]

You do that. You have failed to keep up with developments, and have thus missed the theoretical studies done into raising the operating voltage of solar systems that have been in the offing for more than 3 years already.

Incidentally, the use of 24V and 48V/50V DC in telecommunications has been a sore point in the industry for as long as I can remember.

The logic of trying to raise the voltages makes sense precisely because of the calculation you so proudly posted without understanding a damn thing about what it means.

P = I x V. By increasing the voltage, you lower the current in the system and still achieve the same power.

As soon as the PV technology became available, the move was inevitable.

Right. So 1000 Volts and 6000 Amps on a solar system is credible to you? OK then.