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What does the yellow exclamation point that I see in the result mean? Occasionally an optimized system will show a yellow "!" warning icon ...
HOMER calculates the IRR, Simple payback, and Discounted payback by comparing 2 systems. For these metrics to make sense, the Base case syst...
Question: I am designing a hybrid PV-Diesel system with storage. I have a question concerning the simulation results. The renewable fract...
HOMER currently assumes 100% availability (excluding resource limitations) for every component, including the grid. We plan to change tha...
There are two approaches for doing this: METHOD 1: You can allow the grid to purchase electricity from your system, even when using an...
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...
Yes. To add a fuel cell to your system in HOMER, add a generator, indicate that it produces DC power, and enter appropriate cost and fuel...
Yes. Pick two systems that you want to compare from the Optimization Results and divide the difference in capital costs by the difference in...
Yes. Just click the HTML Report button in the Simulation Results window: HOMER will create an HTML-format report containing all the in...
The PV cell temperature is the temperature of the surface of the PV array. During the night it is the same as the ambient temperature, bu...
There are good reasons why you might want to enter multiple values for a particular input variable. First, you might be uncertain as to w...
This Software License Agreement ("_AGREEMENT_") is an agreement between you ("_LICENSEE_") and HOMER Energy, LLC ("_LICENSOR_") that sets...
The Smart Energy 25 is a 25 kWh, 100 kW carbon fiber flywheel. It is an AC device, but HOMER will connect it to the DC bus because it canno...
Applies to all HOMER versions This article explains how to create a new user account at users.homerenergy.com [http://users.homerenergy.co...
Applies to all HOMER versions All versions of HOMER are native to the Windows operating system. However, many users have been able to use ...
Applies to HOMER 2 This article explains how to install add-on library components in the HOMER 2 (v.2.81) library. Add-on library componen...
This article explains how to create and print a quote for the purchase of HOMER 2 at the HOMER users website, users.homerenergy.com. Most of...
This series of 12 videos will help HOMER 2 users understand some of the major differences between HOMER 2 and HOMER Pro and will help you ge...
This article describes how to install and license HOMER Pro. It assumes that you have already downloaded the product and that you are gettin...
WHAT IS THE PRICE OF HOMER PRO? WHAT ARE THE SYSTEM REQUIREMENTS FOR HOMER PRO? WHY DOESN'T HOMER PRO RUN ON WINDOWS XP? HOW DO I DOWNLOA...
This article explains how to upgrade HOMER 2 from a 14-day trial by purchasing a 180-day license. It includes instructions for placing an or...
TO IMPORT A BATTERY FROM HOMER 2: 1) Create a .hmr file with the battery in it. You can add other components to the model if you like, but ...
Some users request a way to add a power source from imported data to HOMER, for example, from another simulation tool like PVsyst. We may ad...
If you are having trouble licensing HOMER Pro, or are being re-directed to a purchasing screen, please contact support@homerenergy.com and a...
Control of the batteries is one of the more nuanced corners of HOMER. Just like everything else in HOMER, battery control decisions are base...
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,...
To create a new component model in the library, use the "Copy" button. We removed the "Add new" button from the HOMER Pro Library in favor...
The "Daily Profile" plot in the Load menu is the average of weekdays in January. If you are generating a synthetic load from a built-in prof...
I TRIED TO INSTALL HOMER PRO, AND SAW THIS ERROR MESSAGE: "THERE IS A PROBLEM WITH THE WINDOWS INSTALLER PACKAGE. A DLL REQUIRED FOR THIS IN...
Several add-on modules are available that add advanced functionality to HOMER Pro. New modules will become available as they are developed. ...
WE HAVE SEVERAL USERS (AND LICENSED VERSIONS OF HOMER). HOW CAN WE SHARE THE COMPONENT FILES THAT WE CREATE ACROSS OUR DIFFERENT SYSTEMS? ...
DEAR HOMER TEAM, I'M HAVING "EXCESS ELECTRICITY" IN A GRID CONNECTED SYSTEM.  I WOULD HAVE THOUGHT THAT GIVEN A SUITABLE INVERTER, ALL EXCES...
I SAW THIS WIND TURBINE IN HOMER VERSION 2.81 BUT COULD NOT FIND IT IN HOMER PRO. PLEASE HOW DO I ADD IT TO MY HOMER PRO MODEL? Some compo...
NOW THAT HOMER PRO CAN MODEL DEDICATED INVERTERS FOR PV ARRAYS, I AM WONDERING WHAT NUMBER TO ENTER IN THE SEARCH SPACE WINDOW. SHOULD I USE...
CAN HOMER PRO MODEL MULTIPLE BATTERIES IN THE ONE SYSTEM? You can specify a quantity of batteries for your battery bank, but HOMER can onl...
WHERE IS THE SUGGESTED LIFE THROUGHPUT (KWH) VALUE COMING FROM? I CREATED A NEW BATTERY WITH A LIFETIME THROUGHPUT OF 921KWH, BUT UNDER THE ...
WHY DOES THE BATTERY DISCHARGE IN JANUARY, BUT NOT IN ANY OTHER WINTER MONTH? This is because of the way the battery energy value is calc...
The grid reliability tab is new for version 3.2, which will be released in late April. We accidentally shipped the version 3.2 help file wit...
HOW DO I MODEL METERS, SWITCHES, CIRCUIT BREAKERS, CHARGE CONTROLLERS, TRANSMISSION LINES, OR OTHER COMPONENTS IN HOMER? HOMER is a power...
License info can be found under the Help tab in the navigation bar at the top of the HOMER window. This window shows you the status of you...
To add a module that you have already purchased in HOMER Pro: * Open the HOMER Pro software that you have installed on your computer ...
I AM MODELING A HYBRID WAVE AND WIND PROJECT. I HAVE COMPONENT PERFORMANCE DATA AND POWER CURVES. WE ARE ALSO DEPLOYING WAVE MEASUREMENT DEV...
AFTER INPUTTING ALL THE DATA AND WHEN PERFORMING CALCULATE, I AM HAVING THE MESSAGE “INFEASIBLE DUE TO CAPACITY SHORTAGE” IN THE SUGGESTION ...
PLEASE CAN YOU ADVISE HOW DO I SET UP A VILLAGE LOAD IN RURAL ETHIOPIA SO THAT I CAN MODEL A HYBRID SYSTEM? THE PRIMARY LOAD THAT IS REQUIRE...
HOMER reports this error when the generator efficiency is greater than 100%. Here is how you can calculate efficiency: Eta = Pout / Pin = P...
HOMER uses a web service to retrieve solar and other resource data from a variety of sources which is historically known as "Fridge". Some...
SEVERAL BRANDS' CONTROL STRATEGIES CLIP THE PV INVERTER OUTPUT TO ENSURE THE PENETRATION OF PV DOES NOT EXCEED SOME PERCENT (FOR EXAMPLE, SM...
You can import a load profile in the "Electric Load Set Up", "Thermal Load Set Up", and "Hydrogen Load Set Up" screen that you first see whe...
I AM MODELING A SYSTEM WITH SEVERAL ELECTRIC LOADS (I.E. MULTIPLE BUILDINGS ON A CAMPUS). I CAN ONLY FIND TWO ELECTRIC LOADS IN HOMER. HOW D...
Sorry, you'll have to cancel the calculation using the "cancel" button displayed to the left of the progress bar. You can save your model if...
Thank you for giving appropriate credit to HOMER Energy in your publications using our software! If you are using a trial version or a pur...
Academic licenses, and our academic discount, are available to degree-granting institutions only. Academic licenses need to be installed o...
There are a few different ways to get started and learn how to use the HOMER Pro software. * In our new release version of 3.2, we have bu...
In HOMER, the CONVERTER component generally models any device that converts power from AC to DC (rectifying) and DC to AC (inverting). Some ...
CAN HOMER MODEL A SYSTEM THAT USES ENERGY STORAGE (BATTERIES, PUMPED HYDRO, ETC.) FOR PEAK SHAVING? Peak shaving requires the Advanced Gri...
WHAT IS THE BEST WAY TO MODEL INTERMITTENT GRID SUPPLY, FOR EXAMPLE, IN INDIA WHERE THE GRID IS RUNNING 10 HOURS PER DAY? Make sure you ar...
IS THERE A DISPATCH METHOD TO NOT RUN A GENERATOR WHEN THERE IS INSUFFICIENT THERMAL LOAD FOR APPLYING WASTE HEAT? Yes, there is. In the ...
HOW CAN I CONTROL THE EXCESS ELECTRICITY FACTOR IN THE RESULTS? I HAVE TRIED REDUCING THE COMPONENTS SIZE BUT IT WAS STILL 80%. ESPECIALLY I...
THE INPUTS FOR CO2 SEEM COMPLICATED, ESPECIALLY FOR BIOMASS FUELS. WHAT DO THEY MEAN? CO2 is calculated on a mass balance. HOMER assumes t...
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