Ask ChatGPT

[fwunder]

Just for grins I asked ChatGPT:
===============================================================================

In the following system what gauge cables and fuses should be used from batteries to inverters?

2 Victron Multiplus II 5kVa 48/5000/70 Split Phase configuration
3 Pytes V5 UL9540A 1C 48v Battery in parallel
Victron Lynx Distributor – Power Distribution System (M10)


ChatGPT said:

For your system, which includes two Victron Multiplus II 5kVA Inverters in a Split Phase configuration, three Pytes V5 UL9540A 1C 48V batteries in parallel, and a Victron Lynx Distributor, it's important to size your cables and fuses based on the maximum current and the setup's configuration. Let's break it down step by step.

1. Battery to Inverter Cable Sizing and Fuses (DC Side)

Since you are using two Victron Multiplus II 5kVA inverters in split-phase configuration, the current draw from each inverter can be calculated based on its rated power and voltage.

Inverter Specifications:

• Victron Multiplus II 5kVA (48/5000/70):
• Rated output power: 5000W
• Nominal DC voltage: 48V
• Maximum charging/discharging current: Around 104A (5000W / 48V = 104A)
• Maximum continuous DC current draw: 104A (per inverter)

Cable Sizing:

Each inverter can draw a continuous current of 104A from the batteries. However, since you're using two inverters, we need to factor in the total current draw if both are running at full load.

Total DC current draw (if both inverters are running at full load): 104A x 2 = 208A.

Cable Gauge:

For current handling, it's recommended to go 20-30% higher than the maximum continuous current for safety and to account for short bursts (like inrush currents). Therefore:

• For 208A total current, a 2/0 AWG cable could suffice for shorter runs (under 10-15 feet).
• For longer runs (15+ feet), you should use 4/0 AWG cable to reduce voltage drop and ensure safety.

Fuse Sizing:

To protect your system, you need to fuse the cables correctly.

Fuse Size for Inverter DC Input:

• The fuse should protect against overcurrent, but you also want to allow for the peak load. For each inverter's DC input, fuse sizes should generally be rated around 150A-175A.
• For 208A total (across two inverters), use a 175A Class T fuse for each inverter, or 200A fuses if you prefer a slightly higher threshold.

Fuse sizing:

• 175A-200A Class T fuses (per inverter).
• For the combined battery-to-inverter link, you'll need to fuse each inverter separately.

2. Battery Bank to Victron Lynx Distributor (Main DC Distribution)

Since you're connecting three Pytes V5 UL9540A 1C 48V batteries in parallel, it's crucial to size the cables appropriately for the total battery current.


Battery Bank Total Current:

• Each Pytes V5 48V battery is rated for 1C discharge rate, meaning it can provide 100A continuously.
• For three batteries in parallel, the total discharge current could be 300A (100A per battery x 3 batteries).

Cable Sizing:

For 300A continuous current, you would typically use 4/0 AWG or 00 AWG cable.

4/0 AWG is typically good for 300A and is commonly used in larger battery systems.

If you are using very long cables between your batteries and the Lynx Distributor, you may need to increase cable size to minimize voltage drop.


Fuse Sizing:

• Battery bank fuse: The fuse should be sized to protect the entire battery bank from short circuits or overcurrent situations. For a 300A current, you would want a 300A fuse at the battery bank, placed as close to the battery terminals as possible.
• Use a 300A Class T fuse or 250A fuse if you'd prefer a lower threshold.

3. Wiring Between Victron Lynx Distributor and Inverters:

The Victron Lynx Distributor acts as the central point for DC distribution, and it connects your batteries to your inverters.

DC Distribution and Cable Sizing:

From the Lynx Distributor to each inverter, you’ll use cables that match the current draw of each inverter (about 104A).

• For 104A, 2/0 AWG cable is typically appropriate.
• For runs over 10-15 feet, go with 4/0 AWG.

Fuse Sizing for Distribution:

Each cable run from the Lynx Distributor to the inverter should be fused at the inverter’s DC input current (around 175A for safety).


Summary of Recommendations:

Batteries to Inverters (DC side):

• Cable size: 4/0 AWG or 2/0 AWG (based on cable length)
• Fuse size: 175A-200A Class T fuses for each inverter

Battery Bank to Victron Lynx Distributor:

• Cable size: 4/0 AWG or 00 AWG (for 300A total current)
• Fuse size: 300A Class T fuse (main battery protection)

Lynx Distributor to Inverters:

• Cable size: 2/0 AWG or 4/0 AWG (based on run length)
• Fuse size: 175A Class T fuse per inverter

Make sure to also consider the total length of the cable runs to minimize voltage drop and always check your components' specifications for the most accurate requirements.

 

[sunshine_eggo]

RTFM. It's in there.

 

[robbob2112]

interesting - the only thing in there is all the products are blue

Much better than when I asked it to build a battery or draw a simple diagram

Ask it to give you a wiring diagram and post the result

 

[fwunder]

interesting - the only thing in there is all the products are blue

Much better than when I asked it to build a battery or draw a simple diagram

Ask it to give you a wiring diagram and post the result

I asked: Draw a detailed wiring diagram.
==================================

ChatGPT:

I can't directly draw or create images, but I can guide you through creating a detailed wiring diagram step by step, or provide a layout that you can use to visualize and draw your system.

Step-by-Step Wiring Process:​

1. Batteries to Victron Lynx Distributor:​

• Batteries:
  • Three Pytes V5 48V batteries connected in parallel.
  • Each battery should have a positive terminal connected to the positive terminal of the other batteries.
  • The negative terminal of each battery connects to the negative terminal of the other batteries.
• Battery Fuse:
  • 300A Class T fuse should be placed as close to the battery bank as possible (on the positive side).
• Cable:
  • Use 4/0 AWG or 00 AWG cable to connect the battery bank to the Victron Lynx Distributor.

2. From Battery Bank to Lynx Distributor:​

• The positive and negative cables from the battery bank are routed to the Victron Lynx Distributor (M10). The Lynx Distributor acts as the central point for DC power distribution.

3. Victron Lynx Distributor to Inverters:​

• The Lynx Distributor has multiple outgoing terminals for distributing power.
• Cables:
  
  • Use 2/0 AWG or 4/0 AWG cables from the Lynx Distributor to each inverter. The specific size depends on the distance between the Lynx Distributor and the inverters.

4. Fuses for Inverters:​

• Install 175A-200A Class T fuses on the positive cables leading from the Lynx Distributor to each Victron Multiplus II 5kVA Inverter. These fuses are critical for protecting the system from overcurrent situations.

5. Inverter Wiring:​

• Inverter Cables:
  • Connect the positive and negative terminals from the Victron Lynx Distributor to the Victron Multiplus II inverters.
  • Each inverter should have its own separate fused line.
• The inverters will then convert the DC power from the batteries to AC power (for your grid or load connections).

Diagram Layout Example:

Here’s how you can visualize the wiring diagram in a text-based format. If you'd like a graphical version, you could either use software like Fritzing, AutoCAD, or SketchUp.

 

[robbob2112]

Thread 'I asked chatgpt to design a battery'

May 28, 2024

I wasn't very specific, I just told it 16s with the largest available eve cells and a diagram.

Here is the result for amusement purposes only



Certainly! Here are the detailed steps to assemble a DIY LiFePO4 (LFP) battery using EVE prismatic cells in a 16S1P configuration, based on the provided diagram:

### Components Needed:
1. **Battery Cells:**
- 16 EVE LF304K prismatic cells (304Ah each).

2. **Battery Management System (BMS):**
- Batrium Watchmon 5 BMS.
- Longmons or Cellmons for cell monitoring.
- Shunt module for current monitoring.
- Temperature sensors.

3...

• robbob2112
• Replies: 47
• Forum: DIY LiFePO4 Battery Banks

• 
• 
• 

https://diysolarforum.com/attachments/screenshot_20240528_193227_photos-jpg.218322/

You can tell it you want a diagram anyways and it will make an attempt... but it isn't designed for it

 

[DPC]

Thread 'I asked chatgpt to design a battery'

May 28, 2024

I wasn't very specific, I just told it 16s with the largest available eve cells and a diagram.

Here is the result for amusement purposes only



Certainly! Here are the detailed steps to assemble a DIY LiFePO4 (LFP) battery using EVE prismatic cells in a 16S1P configuration, based on the provided diagram:

### Components Needed:
1. **Battery Cells:**
- 16 EVE LF304K prismatic cells (304Ah each).

2. **Battery Management System (BMS):**
- Batrium Watchmon 5 BMS.
- Longmons or Cellmons for cell monitoring.
- Shunt module for current monitoring.
- Temperature sensors.

3...

• robbob2112
• Replies: 47
• Forum: DIY LiFePO4 Battery Banks

• 
• 
• 

https://diysolarforum.com/attachments/screenshot_20240528_193227_photos-jpg.218322/

You can tell it you want a diagram anyways and it will make an attempt... but it isn't designed for it

Ask it for an electrical schematic of a starts stop station.
Don't have food or drink in your mouth before you look....

 

[robbob2112]

This is from chatgpt with your question --- It likes me better


2 Victron Multiplus II 5kVa 48/5000/70 Split Phase configuration
3 Pytes V5 UL9540A 1C 48v Battery in parallel
Victron Lynx Distributor – Power Distribution System (M10)

I want a wiring diagram/picture of this setup

 

[robbob2112]

Ask it for an electrical schematic of a starts stop station.
Don't have food or drink in your mouth before you look....

 

[robbob2112]

Design a 16s LFP battery for me... a jbd BMS, 16 EVE prismatic cells - the MB31 variety... and a class T fuse on the output - give me a picture


Those don't look like 314ah prismatic cells

​

closer - but the 16 cells should all be the same size... and there should only be 16 of them... they are rectangular and blue with posts on the top

 

[SomethingAppropriate]

And people expect miracles from AI...... LOL

 

[robbob2112]

ChatGPT is a LLM (large language mode) not an engineering or that sort of design AI... I imagine one of those could do better.

 

[DPC]

I bet if you asked it to draw a set a large set boobs it would get that right....
All three of them....l

 

[robbob2112]

 

[DPC]

Maybe the wording is the problem
Ask it to draw a large Teat...

Hmm...
It can describe it for me and answer any questions.
But no Teats....

Bugger....

When did Youtube turn into an AI generated soft core porn things?

 

[Quattrohead]

Soon everyone is going to start an argument with "let's break this down step by step"

 

[SomethingAppropriate]

Soon everyone is going to start an argument with "let's break this down step by step"

I haven't met a woman with enough patience to do that. I'm sure its just my problem and no one else's.

 

[MakeMePower]

it does not do diagrams correctly like that, i know the trend here is to bash the crap out chat gpt, but I use it daily if you provide the proper inputs it generally gets most things correct. as always trust but verify.

 

[Quattrohead]

I haven't met a woman with enough patience to do that. I'm sure its just my problem and no one else's.

So you hang out with the type that start with a bottle across the back of the head huh

 

[DPC]

God I shacked up with a girl like that.
6 feet tall, played basket ball, 200 pounds of fury in a bar fight.

Inside soft and giving like a nerfball, but out side powerful like a Female bonobo...

Wo-man!!!!!

 

[SomethingAppropriate]

So you hang out with the type that start with a bottle across the back of the head huh

Its not much of an argument! Tho usually its random flying objects.

 

[HRTKD]

It's interesting that even the AI thinks that the Multiplus actually outputs 5000 watts, when it doesn't.

 

[Madcodger]

Benedict Evans (an early stage investor who writes an excellent blog) recently wrote about his experiences asking ChatGPT for specific information. He tested it with known, verified information and the results were not accurate, even when he gave it additional guidance, hints, and opportunities. He then went on to note that using AI for this type of work is not optimal, nor what it is good at doing. I won't try to paraphrase him further, but it's probably a bad idea to use AI if one needs specifically correct information, at least at this stage. In other words, please don't let it design your PV system.