Clean energy tech news from Mathew Wrist Leamington UK today: While solar power certainly is less polluting than fossil fuels, some problems do exist. Some manufacturing processes are associated with greenhouse gas emissions. Nitrogen trifluroide and sulfur hexafluoride has been traced back to the production of solar panels. These are some of the most potent greenhouse gases and have many thousand times the impact on global warming compared to carbon dioxide. Transportation and installation of solar power systems can also indirectly cause pollution. See extra info on Read extra info at Matthew Wrist.
Usually the largest single cost factor is lighting. Obsolete light bulbs only use about ten percent of the electricity to make light. 90 percent are lost as heat. They produce heat rather than light, because they are based on a glowing filament made of tungsten. Modern LEDs use almost all of the electricity to make light. You can clearly notice this from the fact that they stay cool, i.e. there is much less loss. A good LED needs about a tenth of the electricity to produce the same amount of light. And because it does not heat up so much, it lasts much longer. And: The price of LEDs has come down so much, that exchanging them for regular light bulbs pays off within one or two years. The same is true for industrial lighting systems which often use mercury vapour lamps. These, too, use up a lot of electricity and can easily be replaced by LEDs.
Solar energy has to be used right away, or it can be stored in large batteries. These batteries, used in off-the-grid solar systems, can be charged during the day so that the energy is used at night. This is a good solution for using solar energy all day long but it is also quite expensive. In most cases, it is smarter to just use solar energy during the day and take energy from the grid during the night (you can only do this if your system is connected to the grid). Luckily your energy demand is usually higher during the day so you can meet most of it with solar energy.
Clean solar energy solutions with Matthew Wrist Warwick UK today: Those appliances in the household with the highest electricity demand are the dish washer, the washing machine, the tumble dryer and the kitchen stove. These can easily be equipped with timer switches, so that they run during the day, when the solar generator on the roof is producing a lot of output, which can be used directly. A high-wattage stove might be a challenge for PV by itself. In this case, a large storage unit (solar battery) can be used as a buffer for short-term load peaks. Because it is not just the number of kilowatt hours on the roof that has to be sufficient, but also the currents made available at short notice. This determines if a storage unit is designed for capacity (in kilowatt hours) or output (in kilowatts).
A 4kW solar panel system is a common size for the average Warwickshire UK home. It has an output of 3,400 kWh per year and costs around £6,000. If you compare this to the average annual electricity consumption of a household, which is around 3,200-4,100 kWh, solar panels can cover 83-106% of your electricity demand in perfect conditions. However, this depends on sunshine hours and energy usage. A more detailed breakdown of seasonality and monthly energy output can be found further below. In addition, with incentives like the Smart Export Guarantee (SEG), you can even earn money for surplus energy exported back to the grid!
When considering solar panels for your roof, it is important to take into consideration whether the roof is strong enough to support the weight of the solar system. For example, a 4kW system normally has 16 panels of 250W, adding up to a total weight of approximately 280kg. Nowadays, most materials are suitable to hold solar panels — it’s only slate and wooden roofs that may be too brittle. In addition, consider if your roof is large enough to have solar panels on it. You will need at least 30 cm of space around your solar panels, so you need to take this into account when calculating how much roof space you have. For example, a 4kW system having 16 panels requires at least 29 m2 roof space.
I mention price and quality here because generally, the old adage is true. You do get what you pay for. Diesel generators generally cost more to purchase yet tend to last the longest. One of our diesel generators is a 1996 model, the other is 2004. And our neighbor runs a 1956 (!) Lister still running strong. Gasoline models will wear out the fastest of the three types of generators although they are far cheaper on their initial purchase. Propane generators run somewhat cleaner and generally quieter than diesel or gasoline. And generators with a low rpm (typically 1800 rpm) should last longer than those that run at a faster rpm (typically 3600 rpm).