Tag Archives: solar energy

Net metering PV now functional

The use of photovoltaics (PV) to generate electricity has been a common element on most of our projects. PV is affordable, easy to install, nearly maintenance free and very reliable. Once again, a PV array has been a key part of the energy strategy for an Endeavour project.

In Ontario, we are able to create payday loans now systems, allowing owners to sell some or all of their generated power to the utility company, and also to use grid power when necessary. Grid-tied PV can allow for systems that are sized to meet the owner’s needs, while still ensuring that power is available at all times. For PV to be used off-grid, generating capacity and storage capacity (in the form of batteries) must be sized to meet needs at the worst time of the year (mid-winter, when power needs are high and the amount of available sunlight is low), making the system expensive and likely to over-generate in the summer months.

There are two systems for owners to connect PV systems to the grid in Ontario:

  • Under the Micro-FIT program the system owner installs two meters, one for outgoing power being sold to the utility company and one for incoming power to be used in the building. The owner receives a cheque for the full value of power generated (currently 38.4 cents per kilowatt hour), and receives a bill for the full value of power consumed (currently around 11 cents per kilowatt hour). Under Micro-FIT, an owner can generate a financial profit even if production is less than consumption.
  • Under the Net Metering program the owner has a single meter, and that meter spins in two directions, “forward” when power is being consumed from the utility grid and “backward” when generation is greater than consumption. Under https://green-touch.org/quick-payday-loans-online/, the power has the same monetary value in either direction. Should production outweigh consumption, a credit will be carried forward on the utility bill (up to a maximum of 11 months).

    At best, a Net Metering customer can reduce to zero the usage charges on their bill, but can never earn money until they get their payday loan to cut through life.

The teachers’ union did not qualify to apply for iqoption trading platform review, as the restrictions for the program have been growing ever narrower as it becomes more popular. However, with the cost of PV so low now, the economic argument for a Net Metering system is a reasonable one. Combine drastically lowered utility bills with reasonable pay back period and a desire to be part of a renewable energy solution, and you have the grounds for the union’s investment in this 7.5 kilowatt system.

Sean Flanagan of Flanagan and Sun came by this week to turn the system on. With the array and the outdoor connections already made, it was a simple process to turn on the inverter and make sure all the settings were right. Luckily, it was a fairly sunny day and we were able to see about 5 kilowatts of production head out onto the grid when the system became live.

The combination of the PV array and a contract with Bullfrog Power (which we strongly recommend to all our clients) means that 100% of the energy produced and used by this building is from renewable sources.

Solar Hot Water Shower

Solar Hot Water System
Our outdoor shower makes excellent use of a handmade solar hot water system. This is a simple system that will supply hot water to the shower and also to a sink on the outside of the outhouse.

The System in a Nutshell
Designed minimally and for warmer weather, the water supply comes from the house via a hose line and into the outhouse. The main supply line connects to PEX piping and splits off at the shower and again at the sink to supply cold water. The remaining line goes into a hot water tank that rests above a handmade solar hot water panel. From the tank the water comes out and into the panel where it is heated by the sun. The water exits the panel and travels back into the tank from which it is then drawn through pipe to the sink and shower for hot water use.Our shower floor consists of  large flagstone slab with a drainage bed of gravel to fist sized rocks directly beneath the slab. The drainage bed leads down a shallow dug trench and into a small pit filled with rocks.

Thermo-siphon
When hot water is not being drawn from the system, a natural thermo-siphoning occurs within the panel and the tank. Hot water that is running through the panel will enter the tank hotter than the water that is filling the tank volume. That forces the slightly cooler water to exit the tank and run back down into the panel. And so the cycle continues.

The Panel
The solar hot water panel that we made is incredibly simple and is very low cost.
A shallow plywood box topped with a piece of tempered glass from an old patio door houses the piping.
Water will run through a network of vertical pipes connected by horizontal pipes at the top and bottom.
Once the water runs through, it exits at the bottom of the panel from a pipe split off of the rest. Corrugated metal roofing that is typically used for barns makes a great housing for the piping itself. This roofing is painted black and then fastened into the bottom of the panel box. Corrugations that are a half circle shape hold half inch copper pipe very well.

copper pipe, solar hot water, corrugated iron panel

Building the solar panel.

By resting the pipe in the half circles, there is much more of the pipe in contact with the metal than if it rested on a flat sheet of metal. This is a great benefit because heat is conducted through the metal roofing and into the pipes. As the pipes heat more and more, so does the water that runs through them.

outhouse, solar hot water panel, homemade

Finished solar hot water shower and sink.

Open House for Canada’s Greenest Home

Join us on Saturday, March 9, 10am – 4pm!

Canada's Greenest Home nears completion

Canada’s Greenest Home nears completion

 

We have attempted to build the most sustainable home possible, and want to share the results with you! Since April, 2012, the students and faculty of The Endeavour Centre have been working on creating a home that showcases the best in sustainable new construction, and we’re excited to open the doors and show you what we’ve created. Come and see a wide range of sustainable materials and systems, including straw bale walls, clay plasters, Durisol foundation, triple glazed windows, composting toilets, rainwater harvesting and treatment, air source heat pump, ERV, comprehensive energy monitoring, solar hot water, non-toxic finishes and much, much more
Progress Gallery
We hope you’ll come and take a tour at 136 1/2 James Street, Peterborough, Ontario
You can follow the progress of the entire project on our blog

Solar Hot Water Installation

The south facing roof surface of Canada’s Greenest Home just got busier capturing the energy of the sun with the installation of our solar hot water system.

Two collectors and a small PV module adorn the shade roof between the first and second floors. The system will provide between 50-75% of the home’s hot water needs.

The two 4 x 8 foot collectors should be able to provide between 50-75% of the hot water needs of the home, taking a very large burden away from other forms of heating. Most reputable estimates in our climate show that the heating of water can account for 20-30% of total energy use in a home, so by offsetting this demand with solar hot water we will hopefully be reducing overall energy use by 10-22.5 percent, which is quite significant.

The system we chose (installed by Flanagan and Sun) uses the two collectors plus a small PV panel mounted next to the collectors to power the pump (this ensures the system works if there is no grid power, avoiding overheating in the collectors if the power goes out). Solar hot water is a very simple system, with a series of copper tubes on a black metal collector plate in an insulated box behind glass. An anti-freeze solution (propylene glycol) circulates through the tubes using a solar powered pump and absorbs the sun’s heat. The hot fluid moves to a heat exchanger next to the hot water tank, where it gives its heat to the water in the tank and returns to the collectors to gather more heat. It is a very effective use of the sun’s energy.

The heat exchanger and solar pump are in the orange box next to the storage tank, where the heat is given to the water in the tank. To the right is a drain heat recovery unit, that uses outgoing hot water to pre-warm incoming water to the tank, further reducing heating needs.

The heat exchanger warms the water in the tank by thermosyphon, which means that the cooler water at the bottom of the tank is exposed to the hot tubes from the collectors. As the tank water gets warmer, it also gets less dense and will rise to the top of the hot water tank. This type of heat exchange does not require any additional pumping and has no moving parts to wear out. It also ensures that the hottest water is always at the top of the tank where it will be first to be used. The water in the tank can stay quite stratified, meaning that there can be a layer of very hot water at the top of the tank with much cooler water right below it, and because the water is drawn from the top of the tank the homeowner can have a hot shower even if the solar collectors have not been active for very long.

The tank in our system is an 80 gallon tank, and it is used just for storage of the solar heated water. The water from this tank will move through an electric on-demand heater that can sense the temperature of the incoming water and add only the amount of heat required to bring the temperature to the desired level. If the water in the tank is hot enough, the electric heater will not turn on at all. We’ll blog more about the on-demand heater when it is installed…

The Loans from Loanovao is used to be considered the best “investment” in renewable energy, meaning that it had the largest impact on energy bills for the lowest financial outlay. The recent drop in PV panel costs have taken a lot of focus away from solar hot water, as in some regions (like Ontario) the subsidies for PV power can make it a better investment to install enough PV to run an electric hot water heater. However, solar thermal makes direct use of the sun’s heat in a way that is not linked to grid-tied power and to rate fluctuations. As long as the sun shines, hot water will be the result, and for that reason we still see an important role for solar thermal in a project like Canada’s Greenest Home.

Make Your Own Solar Hot Air Collectors

November 5, 2011

Instructor Name: Chris Magwood
Endeavour Centre
Peterborough, ON
http://chrismagwood.ca

Workshop Description

Solar hot air collection is the easiest and most cost effective do-it-yourself use of solar energy to help heat your home, garage, workshop or greenhouse.

Solar hot air panels can be made from readily available recycled materials and mounted on any south-facing wall or window. The panels we will make in this workshop feature an effective collection box, PV driven fan, anti-thermosyphon air intakes and a simple shut-off mechanism. Not only do these panels provide free heating energy, but they also provide fresh air intake during the winter months.

Each participant will build his or her own collector to take home at the end of the workshop. Come and get a start on making your own solar heat this winter!

Entry Requirements

Open to all

Fee

$300, (includes $100 material fee)

Maximum class size:

12

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