I am currently working on a Project in which I have several time series of PV plant and wind farm productions for several years. The study consists of studying the behaviour of a ESS that will be implemented in PV plant. A load will be served with the combination of PV+ storage and the other generation of wind farm. Currently, I do my study with custom resource in order to study the project and I am doing the same process per year, but it is not exactly what I want to do. Therefore, I have several questions that I want to share with you:

1. Is it posible to enter several custom sources in HOMER? I want to enter a specific custom source for the PV an another for the wind farm, Now, I do the simulations with only one custom source that is the sum of the different generations per year.

2. I was wondering if there is a way of simulating all this years, entering the production for the different years in case of wind farm generators. I know that with multi year option I can simulate the degradation of PV for a specific lifetime poject. But in case of wind farm, I want to enter all the data at a time because, there are no typical years in this case due to the variability of wind speed.

3. Finally, I was wondering if I can simulate the charging of ESS from a specific source. (In my case I was wondering if I can simulate charging my ESS only from my PV plant).

Thank you in advaced.

Best regards,

Sindia

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(1) I know that Homer allows me to use either NREL or NASA databases for GHI. It also allows me to input a time series of solar radiation. I want my simulation to generate the specific PV output power that I have, so I tried to convert this PV output power into solar radiation. I set up the PV array to a zero degrees inclination angle and zero degrees azimuth angle. I was expecting to obtain: PV output = GHI*(PV power)*(derating factor). From that equation I calculated GHI = (PV output)/((PV power)*(derating factor)).

I know that incident radiation is calculated from a series of equations available in the Homer web site, but since I set up the inclination angle and azimuth to 0 I expected the incident radiation to be equal to the GHI. It turns out that it is not equal. Furthermore, I am interested in a 2-week period of time, so I tried to adjust manually by trial and error the solar radiation to obtain the desired PV output power. However, a big change in solar radiation didn't translate to a change in PV output power. Do you have any ideas on how I can simulate a specific PV output power?

(2) As I mentioned before, I am interested in a 2 week scenario. I want the batteries to be the priority over the gas generator. However, I know that Homer always choose the cheapest source of electricity first, and it turns out that the gas generator is always cheaper than the lithium battery bank. The only way I could prioritize the batteries was by setting up a very low price for them, but then the economic analysis doesn't match. I know I can write down a Matlab code to create my own dispatch algorithm, but I was wondering if there is an easier way to make Homer use the batteries before the generator without decreasing the price of the batteries.

]]>I hope this message finds you well.

I just wanted to know if it is possible to model a **SOLAR STIRLING ENGINE** on HOMER, and if yes, how to do so?

Thank you.

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**What alternatives one has in that case? is there a way to import such model directly?**

It is becoming very popular for Independent Power Producers (IPPs) to offer a rate per kWh in a Solar PV Power Purchase Agreement (PPA). This option has no initial capital, replacement or annual O&M cost. Is there a way to model sensitivity on the PPA rate? The PPA rate can also have an annual inflation.

Thank you!

]]>I am currently looking at simulating the Vergnet GEV MP-C wind turbine with my grid-connected system, but I am a bit confused as to what to estimate in the "Turbine Losses" section. I was thinking of estimating 10% losses for availability, turbine performance, environmental, other, and wake effects. This would multiply to give overall loss factor of 40.95%. Does this seem accurate? Anyone else able to provide some insight as to what loss factor I should be using?

Thanks in advance

]]>I am modelling a system with 4 generators (163, 163, 228, 300 kW) with a peak load of 457 kW around 8 p.m and an average load of 205 kW.

I am trying to integrate PV and batteries to the system. I have put PV on AC link without considering any specific inverter but considering the latest in the cost. The battery system is on DC and a converter allow the electrical flux between AC and DC.

HOMER gives me best result as 450 kWp PV + all generators + 150kWh/100kW battery system.

Why is PV size that high if during daylight my load is around 200 kW ? Does HOMER size PV on peak load ? (scaled load 449 kW)

]]>I have modeled two different systems using HOMER (PV/Vestas wind turbine/grid and PV/Vestas wind turbine/Enercon wind turbine/Grid). I use the same 10-minute time series txt file for the wind speed input in both cases. However, I noticed that the energy output for the Vestas wind turbine are different in each case. I am wondering why this happens. Shouldn't they be similar since the input are similar? Any feedback is appreciated.

Thank you!

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I can see that HOMER shows the hourly energy production of components in the Simulation Results of a project. I was wondering if HOMER can provide this information in smaller intervals, such as every 5 minutes. Any suggestions would be appreciated.

Thank you!

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