HOMER Pro does not model the battery charge controller as a separate component, so you must include its cost and efficiency in the values you specify for other components. If you are simulating a PV-battery system or a grid-connected PV system, the best place to include the charge controller costs and efficiency is the PV aray inputs. In the cost

Yes. HOMER Pro assumes the system does include a maximum power point tracker (MPPT). HOMER Pro uses a very simple model for the PV array output: it assumes the power output of the array is linearly related to the amount of solar radiation striking it. (For details, please see the article on how HOMER Pro calculates the output of the PV array.) That

HOMER Pro 3.5.9 (32-bit y 64-bit) está disponible en español. Esta versión de HOMER Pro tiene los siguientes seis módulos disponibles: Biomasa, Calor y Energía combinados (CHP), Hidro, Red avanzada, Carga avanzada, e Hidrógeno. Para cambiar el idioma de HOMER Pro a español o inglés, por favor sigue los siguientes pasos: 1. Con HOMER Pro 3.5.9 ab

Yes, but it assumes that all prices escalate at the same rate. With that assumption, inflation can be factored out of the analysis simply by using the annual real interest rate rather than the nominal interest rate. All costs are therefore in constant dollars. The expected inflation rate under Project Economics models all prices to escalate at the

Yes. The PV Inputs window gives you the choice of explicitly modeling the effect of temperature on the PV array. If you choose to do so, you need to enter ambient temperature data, which HOMER Pro uses to calculate the cell temperature in each time step. If you choose not to explicitly model the effect of temperature, you should still account for t

Solar thermal for heating applications is outside the scope of HOMER Pro, which deals only with generation of electricity. We plan to add Solar Thermal Generation to future versions of HOMER Pro.

HOMER Pro version: 3.11.4 HOMER Pro uses a web service to retrieve solar and other resource data from a variety of sources which is historically known as "Fridge". Some resources, for example the solar resource, have a button "Download From Internet..." which can generate an error dialog that may say "Resource service unavailable: (...)" or "Frid

One of the biggest challenges in using a model like HOMER Pro is finding the numbers to put into it. This page is meant to help you find the information you need. If you know of any other helpful sources, please let us know so we can add them. Note that NREL cannot guarantee the accuracy of any data from external sources and does not endorse any ma

HOMER Pro uses the following equation to calculate the output of the PV array: where: YPV is the rated capacity of the PV array, meaning its power output under standard test conditions [kW] fPV is the PV derating factor [%] is the solar radiation incident on the PV array in the current time step [kW/m2] is the incident ra

In the solar resource input window, you specify, for each time step, the global horizontal radiation. That is the total amount of solar radiation striking the horizontal surface on the earth. But the power output of the PV array depends on the amount of radiation striking the surface of the PV array, which in general is not horizontal. So, in each

HOMER Pro is available in Spanish in version 3.5.9 (32-bit and 64-bit). To change the language of HOMER Pro please follow these steps: 1. With HOMER Pro 3.5.9 open, go to File (or Archivo if it is in Spanish already). 2. Here click on Settings (or Ajustes if it is in Spanish already). 3. A menu with multiple options will show up. Open the la

HOMER Pro uses only metric units. The software contains a help file with a table of unit conversions to help convert between imperial and metric units.

Not yet, but HOMER Pro does have a help file that contains a Spanish-English glossary of terms.

HOMER Pro seems to give more optimistic results than HOMER Legacy. Is HOMER Pro less conservative in its simulations? Or was Homer Legacy found to be overly conservative and the Pro version still underestimates the results but to a lesser extent than Legacy? For identical inputs, HOMER legacy and HOMER Pro will (except for bug fixes) produce exact

In several parts of HOMER Pro, you will find a blue box-and-whisker plot of monthly values. The top line corresponds to the overall maximum, and the bottom line to the overall minimum. The top of the blue box is the average daily maximum, and the bottom of the blue box is the average daily minimum. The middle line is the overall average.

We offer regular opportunities for HOMER Pro users to learn more about the software. More information about our online training sessions and registration information can be found by clicking the following link: https://www.homerenergy.com/services/training.html

This question usually comes to us either as "Why doesn't HOMER rank systems by cost of energy (COE)?" or "Why didn't HOMER choose the system with the lowest COE?". The real question is, why is the total net present cost (NPC) better than the COE as an economic metric? The answer is because the NPC is a more trustworthy number than the COE. The con

HOMER Pro performs two separate processes to the load data you enter, both of which can affect the peak load. The two processes are scaling and adding random variability. The scaling process changes the magnitude of the data without affecting its shape. You can enter load data (either by importing time series data or specifying daily load profiles

HOMER Pro calculates payback by comparing one system with another. In general, payback tells you how many years it will take to recover an investment. You invest a certain amount of money up front, then earn income from that investment, and the payback is the number of years it takes for the cumulative income to equal the value of the initial inves

There are two reasons why the overall optimization results table might not show a system configuration that you asked HOMER Pro to model. First, only feasible system configurations appear in the optimization results tables. HOMER Pro discards infeasible configurations so they do not appear in the lists. Second, to limit file size, HOMER Pro does no

People often wonder why they have to enter scaled averages for load and resource data. Can't HOMER Pro just use the specified data without scaling it? Yes it could, but then you wouldn't be able to do a sensitivity analysis on the load size or the wind, solar, hydro, or biomass resource. We introduced the scaled averages to allow users to perform s