Is there a way where a scenario with "Thermal Load 1" and a "Thermal Load 2" can be inserted into HOMER? No, unfortunately HOMER cannot model two thermal loads. The best you can do is probably to model the electric load and one of the thermal loads in HOMER, then model the second thermal load in a separate HOMER file or elsewhere, for example

Could you explain me how the excess electricity is calculated in homer and what does it mean? In HOMER, excess electricity occurs whenever the system produces more electricity than the system can use. It will occur whenever the power production exceeds the load and the batteries or grid can’t absorb all the surplus. But it also may occur due

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 profile, this approximately matches the hourly profile table on the left. If you import a load profile from a file, it is computed from the data. Weekdays/weekends are computed for the calendar year 2006.

Does the CoE which HOMER calculates include excess electricity within the actual load supplied? Ie if I have a system with big wind so producing huge volumes that are not used by the grid is the way you calculate CoE giving credit for that or not? HOMER does not use excess electricity in its calculation for Cost of Energy (COE) which really refers

Does the Levelized cost of energy take into account savings of natural gas due to cogeneration? If a generator serves the thermal load with its waste heat, that reduces the boiler fuel consumption. The boiler fuel consumption is one of the factors that contributes to the total net present cost and therefore the levelized cost of energy. So th

I've been meaning to ask you is about simulating the load in a remote commnuity. I've got monthly totals for a community, but that's it. I wanted to use HOMER to model wind-diesel options. In that situation I just assume a daily load profile, then scale it for each month according to the monthly averages. That of course assumes the load prof

I'm still confused on CC vs. LF in HOMER. Even on systems where there is no battery, it makes a difference which you choose. See attached file. I would expect the CC/LF option to have no meaning if there is no battery. Does the deferable load have something to do with it? Good question. Yes, the deferrable load is what makes cycle charging

HOMER worries about the no-load fuel consumption and O&M cost more than maybe you think it should. It figures that it's best to serve the deferrable load when the diesel is on anyway than to take a chance on needing to turn on the diesel later just for the deferrable load because the tank went empty. HOMER has 2 different settings for dispatc

You can define separate AC and DC loads in HOMER. Click Add/Remove, check both primary load checkboxes, and then click on the load buttons in the schematic and make one AC and one DC.

So far I've entered the load information for a small town as well as a 1MW Bonus Wind turbine and a Grid component. Unfortunately after entering the load information (for each hour of 24 hours), HOMER says the annual average is 11,534 kWh/d. The annual average is suppose to be 11,635 kWh/day, which equates to 484.815kWh each hour. I've double ch

Two systems (diesel system and wind-diesel system) are used to power the same load. The diesel system consists of 5 diesel generators of a rating of 1000 kW each. The wind-diesel system consists of the same 5 generators plus 6 wind turbines of a rating of 1.8 MW each. When the analysis were carried out, the total energy production of the diesel sys

I am using the Homer Program and I am having difficulty with the load profile to view it when expoting the file to my documents folder. How can I view this file and others when I down load or export the file for printing? If you click the Export button in the bottom right corner of the Primary Load Inputs window, HOMER will export the scaled h

For imported data, how do I change the two Random Variability components? The Random Variability values (and the mean daily profiles) are inputs when you synthesize load data from mean daily profiles, but they are outputs when you import time series data. If you import time series data, HOMER will calculate all those values, and if you then sw

To model a heat pump in HOMER, you need to figure out the electric load of the heat pump and add it to the primary electric load, or specify it as the second primary load. HOMER won't explicitly model the heat pump itself.

A case where the boiler is not used can arise but one has to look for it, since HOMER only ranks by NPC. It would be simpler not to have the boiler in the first place. Is it possible? Unfortunately, for systems containing a thermal load it is not possible to get rid of the boiler. We hope to remove this requirement in a future version of HOME

Question: I am designing a hybrid PV-Diesel system with storage. I have a question concerning the simulation results. The renewable fraction shows 34% while the portion of energy supplied by PV represents 40% of the total load. I am using load following dispatch strategy in the simulation. Answer: The energy supplied is independent of the load. I

In HOMER it allows you to generate hydogen but you cant connect it your boiler to suffice a heat load why is this? In HOMER's simulation logic we used the simplifying assumption that the boiler is an perfect backup source of thermal energy, on which the system can depend to serve the thermal load any time the rest of the system cannot. Fuellin

Make sure your load profile aligns with one of the six upload formats listed in the following help article: Import time series load profile After you import the load profile using the Import and Edit button, the time series viewer will automatically mark the gaps where data points are missing or has non-numeric values. If you want to replace certa

I need to model the load and more importantly the solar production on weekday holidays so I have to adjust the typical on peak credit of ($.225/kWh) to ($.057/kWh) at these times. Your input (matrix) is for weekdays and weekends only, or can I change that profile byday/week/month of the year? You can enter the load data in two ways. You can

I have one question regarding the decreasing LCOE with increasing load size. You perhaps remember I had done 1 exercise before where for fixed load factor I looked at ViPOR output for increasing no. of identical load points (identical load curve). The result shows LCOE decreases with increasing load. It would be nice if you can through some light

I am questioning if HOMER considers the load to be constant for the entire project lifetime or if we can predict the load growth in the simulations? Yes, HOMER assumes the load is constant throughout the project lifetime. To account for load growth in an approximate way, we sometimes simulate using the load we anticipate in, for example, the 1

When you modify one month, HOMER applies the changes to all subsequent identical months. So if all months were the same and you changed the February load profile, HOMER would apply that new February profile to all months except January.

I wonder if you have some material that I can read more about subject or some explanation as to why we should add the noise. As for why you should add noise, the reason is that electrical loads tend to be noisy. The electrical load from my house is not the same every day, so if I assumed that every day’s load profile was equal to the average l

The loads look a bit strange, specifically 1, 2, and 3 kW? I thought maybe that should be MW, but you wouldn't run a 1500 kW diesel system against a 3000 kW load ? The load profile graph you are looking at, with the 1, 2, and 3 kW loads, is the unscaled data (or baseline data as HOMER calls it). I scaled that data set to average 12 MWh/day, a

The confusing point seems to be the "seasonal" calculation (peak data for the season are not as high as the input data). Also, I'm probably using HOMER way outside it's range (I'm actually looking at State wide data, not just facility data). But I do know the loads for FPL, and entered them for each month. But on the seasonal (monthly data) it s

How do you know that I should add some random variability on the primary load data? Any indicator? We recommended that you add random variability because in almost every case, electrical loads do display random variability. In rare cases where the electrical load comes from some industrial process that is very stable, the load may be the same

If my DC renewable generator ( wind turbine, PV ecc) doesn't produce electricity when the state of charge of the battery bank is 100% as it has a its own control, why is there an excess electricity production by this generator ? I think you are saying that your DC renewable power sources have controllers that reduce their power output when nece

HOMER can model deferrable electrical loads like water pumping or ice making. For details, please look up 'deferrable load' in the index of the help system. HOMER can also model an electric boiler, although in a simplistic way, since it does not model its cost and it assumes the electric boiler has an infinite capacity to convert electricity to h

It would be great if Demand Side Management Concepts could also be incorporated in HOMER so that end-user demands can me manage to balance the demand and supply. HOMER actually can model demand-side management and peak shaving. The "Efficiency Inputs" button on the Primary Load Inputs window lets you specify the cost of efficiency measures tha

Can I put a constraint that the thermal output of CHP provides only one of the two thermal loads? No, unfortunately HOMER can't model the scenario where a thermal energy source can serve only one of the two thermal loads. If the other thermal load will be met exclusively with a boiler or some other dedicated heat source, you could leave it out

I am currently trying to introduce a constant load increase in a wind/diesel simulation. Do you know how this can be done? We have to assume an annual linear load increase for the load profile of 8 % over 15 years. HOMER assumes a constant load throughout the project lifetime, so it does not let you explicitly model load growth. For now, yo

I have in my hybrid system two types of loads, a critical load (so a telecommunication load) and a non-critical load (a non telecommunication load). In reality, this non-critical load would be disconnected from the supply whenever not enough electricity (low voltage in batteries) would be available for both types of loads. Moreover, the low voltage

Does HOMER calculate if the load applied just for night usage? If you are asking whether you can specify a primary load that is zero throughout the day and greater than zero during the night, the answer is yes. You can enter the load either by specifying a 24-hour load profile, or you can develop your own load data elsewhere and import it into

When you enter an average daily load profile, HOMER repeats that profile over and over to create a complete year of data, then it adds some random noise so that every day is unique. When you import hourly load data, HOMER does not need to synthesize load data so it does not need you to enter the noise values. We could have made the noise input bo

I was trying to do some calculations starting from an energy yearly balance of a city that we are going to analyse in a research project (I was using the yearly balance because the time series data didn't arrive to me, I will receive them in one month) and I put in Homer the average electric power, but if I add a noise in the hourly or daily data,

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 do I model many loads? We allow two loads in HOMER. This is to allow you to put one on the AC bus and one on the DC bus. The loads are intended to be a composite of all consumption. The ability to add an arbitr

When I enter the load figures, do I enter them having taken into account the Power Factor (ie my TV has a power factor of 0.9, is 100 watts so I am using 111 watts x hrs as the load to the included)? No, HOMER only considers real power flows, so you should enter 100 Watts for the TV. You should do the same for the generator and any other compo

We especially need to understand what is being done to the load profile by the "scaled annual average". The scaled average value is a mechanism that lets you scale the whole annual data set up or down, which you might want to do to convert units or do a sensitivity analysis such as "what would happen if the load grew by 30%?". By default the s

I noticed that the results say that peak hour is 1.09 kWh when in fact peak in the input data is 1.7+ kWh. Is this a program glitch? No that's not a glitch, it's because you are scaling the data from 33 kWh/day down to 10 kWh/day. From the profiles and the noise values you entered, the peak hourly load is actually 3.59 kW. After scaling it i

Your comparison between the actual and synthetic load data wasn't quite right for two reasons. First, the scaled annual averages were a little different in the two cases. You want the synthetic data scaled to exactly 15,202 kWh/day to match the actual data as well as possible. Second, HOMER's poorly-designed load inputs window stymied your attem

The wind dump load aspect doesn't seem to be working at all. A lot of excess wind energy is being generated but it has no impact on reducing heating fuel consumption. What's happening? You have to explicitly say that excess electricity can serve the thermal load, otherwise it won't. Open the Thermal Load Inputs window and check the checkbox

Can't I just dump all excess wind power to a thermal load? Yes, you can. Near the bottom of the thermal load window, check the checkbox that says "Excess electricity can serve thermal load". Then HOMER assumes all excess electricity goes through a resistive heater and serves the thermal load.

I am simulating a cogeneration system, and I am trying to make a load following on the thermal load. Unmet electricity would be made by the grid, and excess would be sold. How can this be possible? As I don't need any boiler, is it possible to remove it? Unfortunately, HOMER cannot model a system where the thermal load is the primary considerat

Why does HOMER utilize thermal load instead of energy bill data when calculating optimality? The idea of HOMER is that you tell it how much electricity and heat you need, and it designs a system to serve those needs at the lowest possible life cycle cost. It does an hourly simulation of a typical year, and it lets you enter hourly load and res

I need to know how to calculate the houses loads or multiply the one house load with the number of the houses and the utilization factor of the loads? To model a village power system in HOMER, you need to specify the electrical load that the power system will need to serve. That will be the total electrical load from all the houses in the vill

Why do I get large fractions, sometimes bigger than 80% of the electricity generated going to waste? It ususally happens when I have wind turbines in the generation mix? HOMER will record excess electricity in any time step in which the electrical production exceeds the load and the surplus cannot be fully absorbed by the deferrable load or the

Let's assume you have to pump 10,000 L of water per day, and you have a pump rated at 750 W that can pump 5,000 L per hour, and a storage tank that can hold four days worth of water (40,000 L). Your pump would have to work for two hours to meet the daily requirement, which would consume 1.5 kWh of electricity. That means your average deferrable l