How much kw solar system do i need calculator,where do solar panel materials come from,solar water features essex - New On 2016

12.06.2016
About one in three Solar Choice customers are asking about energy storage for solar power, but few have a clear idea of how much battery capacity they need. The list below presents the most popular uses of energy storage, sorted in descending order from greatest degree of energy independence to lowest degree of energy independence.
Peak time independence: Install a system large enough to cover your electricity usage when grid electricity is most expensive.
Energy storage as emergency backup: Install a small energy storage system to be used mainly in the event of a short power outage.
Choosing the right energy storage system capacity can be significantly more complicated and subjective than deciding on the right solar PV system size – mainly because of the greater number of variables involved. Solar Choice is in the process of developing a tool that will help our customers to get an estimate of the right energy storage system size. Amount of energy storage available at the beginning of the day depends on battery state of charge from the night before.
If it is impossible for the solar-plus-batteries system to meet 100% of demand, battery power is prioritiesed for use during peak & shoulder rate times. Electricity consumption level and pattern do not change between months and seasons (admittedly a big assumption). In this instance, the solar energy system is too small to both meet electricity demand and charge the batteries – even for peak demand.
Black line indicates electricity consumption, yellow line indicates solar system power output, purple line indicates battery state of charge (right axis), blue bars indicate solar power into battery, red bars indicate solar export to grid, orange area indicates self-consumed solar, purple area indicates electricity demand met by storage, and grey area indicates electricity demand met by grid.
This example is the same as Example 1, except for a larger solar system – 10kW instead of 5kW. Without an energy storage system, a typical 7kW solar system would send about 70% of the electricity it produces into the grid for this household on the average day. The table below shows that the optimal battery size for this home would be about 15kWh, which allows for self-sufficiency and near 100% battery capacity utilisation in the peak of summer. On the back of the success of our informative and impartial Solar Quote Comparisons, Solar Choice is currently in the process of developing an online comparison platform for energy storage solutions – for retrofit and brand new installations. Recommend on Facebook Share on Linkedin Tweet about it Print for later Tell a friend Related PostsInstalling a battery bank for a grid-connected home? About Latest Posts James Martin IIJames has been working as analyst and online development manager for Solar Choice since 2011.
In your analysis, your third example of an energy efficient household consumed 15kw per day.. Why is it still common practise to have either multiple days worth of power stored in battery banks and or to augment pv with a gen set when increasing the PV array and adding another charge controller is a more cost effective solution?
If I’m understanding you correctly, you bring up a very interesting point – why not just install more PV (which will still generate some power even on a rainy day) rather than installing pricey batteries? Thanks again for your thoughts – this is something that we will certainly bear in mind for future analysis – especially when our research concerns going off-grid or achieving a high level of energy independence! A mostly wild-guess would tell me than I need at least a 25kWh battery storage which would still be “wasting” a lot of generation to the grid during summer? There will be an announcement when our tool becomes live, if you want to join our mailing list (you’ll find a signup field to the left of this page).
By our estimates, 20kW solar and 40kWh of storage would allow you daily energy independence on average and in summer. Hope this helps – happy to try to help you out with further details if you have more questions. The content on this website may not be reproduced in any form without express written permission. We can use simple, effective, and proven policies that have been used to supercharge the New England solar PV industry to incentivize renewable thermal technologies and eliminate oil use for single family homes.
As I started to run the numbers when I was creating the presentation, I was blown away by how much energy renewable thermal technologies produced, and how valuable that energy is when displacing oil, propane and electricity.
For the purpose of this article, I’m going to compare solar thermal and ground source heat pumps to a standard solar PV project in a baseline home. The Northeast uses the most oil for space heating, which also happens to be an extremely expensive fuel source. These are huge industry trends, so let’s break the data down into something more tangible.
However, Massachusetts-specific data reveals that some communities use natural gas (that’s green).
Solar PV is a great investment but doesn’t address oil use — how can we address this problem? The goal of this post is to show how we can use policies and incentives that have already been successfully implemented in the solar PV industry to address fossil fuel use for space heating in New England. When trying to understand renewable thermal technologies and the impact of different policies, a small number of variables seem to be critical for policy makers. There’s a lot of information in the above graph, so I made a few simple graphs that display and answer some specific questions.
Net Invested Cost per Dollar of Energy Output: After incentives are considered, we can look at the net energy investment required to get $1 in energy savings.


Total Man Hours Needed per Job: This is looking at the total direct construction jobs to install a project. Direct Jobs Created per kW Installed: When we look at direct man hours per kW installed, geothermal and solar thermal create the most jobs, followed by solar PV.
20-Year IRR with Current Incentives and Assumptions: This graph shows what the 20-year IRR of these different projects is with our given assumptions. First, renewable thermal technologies can provide as good or better returns than solar PV technologies for property owners. Second, renewable thermal technologies need more policy support, but they do not need as much support as solar PV. Third, renewable thermal technologies create more construction jobs per kW installed than solar PV. Fourth, if we’re serious about incentives for renewable thermal technologies, we must use production-based incentives.
Chris Williams is the Chief Marketing Officer for HeatSpring Learning Institute a national renewable energy training company, Chairman of the Government Relations Committee for NEGPA and an advisor to Ground Energy Support, a provider of real time geothermal heat pump monitoring technology.
This entry was posted in How Solar Works, Residential Solar Hot Water, Solar Business Resources, Solar Hot Water, Solar Hot Water Value, Solar Thermal & Solar Hot Water News, solar thermal for process heat, Solar Thermal Space Heating.
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This article takes a look at the factors that come into play when considering how to choose the right amount of battery capacity for your solar-plus-storage system, using some specific examples examining the case for installing energy storage in Sydney. While this may be a popular aspiration, taking your home or business off-grid is more often than not financially impracticable or just not possible to do with solar-plus-storage alone (especially if you have limited roof space for panels).
During the winter (and possibly autumn and spring) you’ll have to draw power from the grid to meet deficits.
If your usage is higher, the outlay for a system that will meet your daily needs will also be more substantial; you may wish to look at ways to reduce your electricity consumption, or consider a lower degree of energy independence.
Examples of these patterns can be seen in the graph below; they are also discussed in further detail in this article. If, for example, you are currently exporting lots of solar to the grid at low feed-in tariff rates, you may want a larger amount of storage capacity to capture it. This tool will soon be available to the public, but for now we have published some examples from Sydney below. This means that the battery will only have a charge in the morning if there was solar electricity remaining from the day before (after being used to run appliances and charge batteries). Furthermore, a battery bank larger than 10kWh would probably not ever be fully charged on solar alone – the home would need to charge it with the grid at night in order for its full capacity to ever be utilised. With the larger solar array it is possible to achieve a high degree of energy independence with 15kWh or 20kWh of battery storage. In this case, the goal of sizing the energy storage system would be to absorb the excess solar power for later use (without energy storage the solar capacity should be reduced to 1.5-2kW for optimal financial benefit).
If the battery’s size were in increased to 20kWh, however, it would not be possible to charge it using solar alone, so about 25% of its capacity would never be used unless the household charges using the grid or with a generator.
If you’d like to be informed when this new service goes live, please enter your details into the form below and we will be in touch. He holds a master's degree in Environmental Management from UNSW, and a bachelor's degree in Philosophy from Bridgewater State University in his native Massachusetts.
I found it helpful, however I was wondering why with pv becoming so cheap does the model for energy storage not change to reflect this shift? For winter, you’d still be getting about 40-50% of your electricity from the grid unless you cut your electricity consumption then. Many attendees at the talk had never seen the numbers broken out in a way that easily compares apples to apples. Six million homes use oil for heat, and the average home uses 800 gallons of oil per year, which equals roughly 4.8 billion gallons per year. However, there are a large number of communities where 60+ percent of single family homes use an expensive fuel source. I’ll provide a basic comparison of how solar pv and renewable thermal technologies compare when looking at fuel savings for property owners, direct job creation, and the cost of the incentive. If you’re not into the technical part of things, please feel free to skim over this, I just want to be extremely clear with my methodology and calculations. This metric looks at how much incentives decrease installed costs by taking the gross installed costs and dividing them by all available incentives. This is not based on any reports (because they don’t exist for solar thermal and geothermal), but anecdotal evidence. Yes, the IRR of solar PV is getting much lower as installed costs drop and property owners see it as low risk, but also because Massachusetts SREC prices are declining.
My answer is simple: If geothermal received the same REC prices as solar PV, no one would be using oil, geothermal would just be cheaper. Production-based incentives maintain quality control throughout the entire process: manufacturing, design and installation.


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Please note that these results are rough estimates, and should not act as a substitute for recommendations based on your individual circumstances.
7kWh is probably a good battery bank size to have because it strikes a balance between utilisation of excess solar and not oversizing the battery.
However, in order for this home to achieve full self-sufficiency on the average day, it would probably be necessary to shift more electricity consumption to daylight hours and try to reduce their overall usage as much as possible (possible through simple energy efficiency measures). We will also let you know when our energy storage system sizing tool is available on our website. This policy would be much cheaper than the solar PV incentive and would drastically increase the adoption of biomass, air source heat pumps and ground source heat pumps. However, further analysis should absolutely include air source heat pumps and biomass technology. A geothermal system will produce 13,500 kWh net energy from the ground loop, backing out the electric use for the pumps and compressor. Without considering any incentives (using just gross installed costs), how many dollars need to be invested to get $1 in fuel savings?
What we see is that in Massachusetts, solar thermal is the most heavily subsidized technology, followed by solar pv and geothermal. This means that to replace oil with a geothermal project in Massachusetts, you need to invest $7 to get $1 in fuel savings in year one. A typical 4-ton geothermal system will require 360 direct man hours in construction, and a solar thermal system will take 40 hours, and a solar PV project takes around 75 hours.
For geothermal and solar thermal technology, commodity equipment is used and repackaged in a different way.
This is good for policy makers because it means that the cost of deploying renewable thermal technology will be CHEAPER than deploying solar PV. A huge lesson learned in the solar PV industry is that incentives based on installed costs have huge flaws (installing solar PV projects in the shade is one example).
Installing a larger battery bank would only be worthwhile if the home had a larger solar array.
Alternatively, if you filled out the inverter capacity to a full 10kW of solar, that would afford you roughly 50% energy independence on average and roughly 65% independence in the summer (without sending too much solar into the grid).
It would put a huge dent in oil consumption for single family homes, save money and create local jobs. When we compare these technologies in the same terms, it starts to provide a very clear picture of the results that can be achieved by investing in proven renewable energy thermal technologies.
In addition to building and retrofitting buildings to have tighter shells, there are only three technologies, yes three, that can eliminate on-site fossil fuel use: biomass (pellets and cord wood), air source heat pumps, and ground source heat pumps. I then broke down the heating fuel mix for each state, provided by the EIA, and found the number of single family homes in each state that use a high-cost fuel (oil, propane).
Additionally, the solar PV industry is large enough to be a great comparison tool because many people are familiar with the economics of solar PV.
You may be able to reduce this to $4.00 per watt on new construction, but this trend is decreasing. Components for these technologies aren’t industry specific, except for the actual solar thermal modules and geothermal heat pump, but these are easy to manufacture and thus there are many manufacturers. Renewable thermal technologies are cheaper and produce more valuable energy per kW installed, so more of the returns can come from displacing fuel than from a subsidy. Those modules on the left in the photo below will still receive a rebate even though they won’t produce the most power.
If you’re new or curious about thermal incentives, Renewable Energy World has done some great reporting on it. Thus, using solar pv as a baseline will make it easier to communicate the value of other technologies.
The solar thermal system is only a 2.22-kW system, but will produce 4,100 kWh of energy in one year. For the solar PV industry, all main components are specialized: modules, inverters and racking.
I then took the total number of homes and divided it by the number of homes using an expensive fuel source, which you can see on the far right. This means that nine out of 10 homes in Maine are using a very expensive fuel source. However, this is declining as economies of scale are reached on the manufacturing side of the business.



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Comments to «How much kw solar system do i need calculator»

  1. Y_A_L_A_N_C_I writes:
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  2. FenerbahceX writes:
    Original how much kw solar system do i need calculator £7,000 outlay, earning £20,000 from feed-in tariffs solar, PH 2.0 is a higher energy.