Im am trying to find a simple PV cell or panel model i can use in LTSpice
Everyone i have seen so far is so overly complex and riddled with things to show and teach the charecterisitics of the panel itself.
Im just trying to work with an Analog devices chip in lt spice for a different reason and need a pv panel model to run it off

Does anyone have something super simple they can share?
Just a small cell would do. like a 10 watt 12V cell or similar.

 

hi mike.
Unzip this Solar1.zip, keep the 3 files is the same folder.
Change the AC analysis values to suit your project. Vpv or Isc.
E

 

Im am trying to find a simple PV cell or panel model i can use in LTSpice
Everyone i have seen so far is so overly complex and riddled with things to show and teach the charecterisitics of the panel itself.
Im just trying to work with an Analog devices chip in lt spice for a different reason and need a pv panel model to run it off

Does anyone have something super simple they can share?
Just a small cell would do. like a 10 watt 12V cell or similar.

Hello there,

The simplest model has just a single diode, a current generator, a shunt resistor, and a series resistor. That emulates one solar cell.
The current generator represents the insolation level.

A better model allows the ideality factor to change with voltage.
Another model is one that uses two diodes in parallel, one has ideality factor of 1 and the other has ideality factor of 2. That partially emulates the way the ideality factor changes with voltage.
In both we still have the shunt resistor and the series resistor.

For the simplest I'd go with the single diode model. To get higher solar panel outputs simply stack several in series.

 

hi mike.
Unzip this Solar1.zip, keep the 3 files is the same folder.
Change the AC analysis values to suit your project. Vpv or Isc.
E

View attachment 298471

Thank you very much
Sorry for the delay in reply. If i want to make it just a steady state cell such that its sitting at a constant output how can i do that?
I am trying to use it to model an analog devices buck converter that is in LT spice. I need to see how the part regulates when connected to a solar cell. LTC3639

 

Hi Mike,
This is a very basic PV cell, edit Isc and Vpv, make it a .tran.

Note the location of the Load in the circuit
E

2nd is a Basic PV without a 12V battery


@mike _Jacobs

Set Isc at 6 for 2nd Image to give approx 12V

 

Hi Mike,
This is a very basic PV cell, edit Isc and Vpv, make it a .tran.

Note the location of the Load in the circuit
E

2nd is a Basic PV without a 12V battery


@mike _Jacobs

Set Isc at 6 for 2nd Image to give approx 12V

View attachment 299526View attachment 299527

All im getting is an error about step being two dimensions

Im just trying to sweep the resistor through a few values to see how the cell reacts

 

ok, i was able to make it worth with just a resistor
Seems the ISC will control my short circuit current.
The voc right now is about 63 volts.

How can i bring that down? I was looking at the gain inside X1 block
Will "n" do the trick?

 

Hi Mike,
The .tran should be 1 for 1sec run. [ not .tran 1 0 1

Why do you need an Voc value.?
Do you have a diagram to post of the circuit you are powering?
E

 

Hi @mike _Jacobs
Set Isc at 6 and n=1 for 12v

If you use Step LD param Lowest value, Highest , Step increment from Low to High
E

 

Hi @mike _Jacobs
Set Isc at 6 and n=1 for 12v

E

Cool i made it work thanks!