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If you’re considering getting a solar thermal system, one of the first things that comes to mind is the possibility of the system functioning properly during the cold months. The short and simple answer to this question is yes, a solar thermal system works in the winter. However, the downside here is that it’ll be a lot less efficient when compared to how it operates during the warmer months or summer. As a result of this fact, you’ll likely need to rely more on your boiler, immersion heater or any other backup heating system during this period as your solar thermal system will fail to contribute as much as it does during the warmer months. So what exactly is the reason why solar thermal is less effective and less efficient in the winter period? Let’s have a look!

As you know, solar thermal system banks on the sun’s energy to heat the water for your home’s use. During the cold months or winter, the sunlight becomes a lot less available when compared to the warmer months, as a result, there’s less sunlight that’s available to be used for its solar energy. And even more so at the periods when the days are shorter or skies are clearly overcast.

Also having a great impact on a solar thermal system’s output is heavy snow. Flat plate collectors normally have the capacity to cope better during snowy conditions as the light that’s able to travel through the snow will heat up the absorber plate - thereby making the snow slide off more quickly. However, the case is contrary with evacuated tube collectors which possesses a form of vacuum insulation that’s crafted to minimize the loss of heat, meaning they can’t generate heat to melt and cause the snow to slide off in a similar way.

The importance of selecting the right size battery for your home simply cannot be overemphasized. A lot of home and property owners are facing this challenge and understandably so. Selecting the right battery size for your needs depend on a number of factors which includes your motive for adding a battery, your electricity usage, your budget as well as your panel array size, be it new or existing. In this post, we’re going to take you through some of these factors to help you determine the right battery size for your home or property. Let’s take a look!

• Your motive for getting a battery. While most people purchase a battery to wipe out their need to purchase electricity from the grid with the hope of making some savings, others add a battery so as to enjoy backup power. There are also some who just needs it to power their home with solar energy. It’ll not be economical to size a battery to effectively take you off the grid, but if your motive is to make savings, then you’ll should expect to purchase some electricity from the grid during the year.
• Electricity usage. The average household uses about 16kWh of electricity on a daily basis. During the daylight hours, most of these household will use a third of their electricity when the solar panels are still generating electricity, while the remaining two third are purchased from the grid. In other words, you’ll require a minimum of 10kWh battery capacity if you were to use a battery to power the electricity you purchase from the grid.

For a typical British household, you’ll most likely need a 5kWh solar power system which normally generates about 17 to 21 kWh on a daily basis depending on your location in the UK.

Air source heat pumps work by absorbing heat from the outside air and transferring it inside to heat up your property.

An air source heat pump has an outdoor unit containing a refrigerant. This absorbs heat from the air and passes into a compressor, where the temperature is increased. The heat then transfers either into water, which feeds into your wet heating system, or into air, which is dispersed around your property.

Air source heat pumps need electricity to run, but this is to power the compressor rather than directly generate heat.

Air source heat pumps can be a really efficient way to generate heat. Although they require electricity to run, they generate much more heat than an electric heater that uses the same amount.

Air source heat pumps provide heat at a lower temperature than most other types of space heating. This means they’re most efficient when they’re left on for longer periods of time, and distribute heat through wet heating systems with large surface areas, like underfloor heating or big radiators.

Air source heat pumps can be much more efficient than oil and LPG boilers, and older electric heating systems. However, they’re only usually the most efficient option if your property is very well insulated.

There are two main types of air source heat pump: air-to-water and air-to-air. They work in different ways and have different advantages and disadvantages. Make sure you do your research so you know which one is best for you. Alternatively a registered installer will be able to determine the best type for your property.

There are two different types: flat plate, where lots of thin tubes carry water through a flat absorber panel, and evacuated tube, where vacuum glass tubes capture the sun’s energy directly. There is little difference in performance between the two but evacuated tube panels do more obviously extrude from the roof.

Obviously the performance of a solar thermal system will vary depending on the location of the home, the insulation of the property, and your own hot water requirements. Solar thermal panels are capable of providing all of your hot water requirements from April to September. They will still make a contribution to your hot water needs for the rest of the year, but in general you will need a backup system to further heat the water in the colder months.

Whether installing an air source heat pump will help you save money depends on your property, how long you expect to live there, and the type of heat pump you get.

Air source heat pumps are initially quite expensive to install. However, if you get an air-to-water air source heat pump, you’re eligible for money from the Renewable Heat Incentive [https://www.energysavingtrust.org.uk/scotland/grants-loans/renewables/renewable-heat-incentive] (RHI). This is a UK government scheme that gives you quarterly cash payments over seven years if you install an eligible renewable heating technology (air-to-air air source heat pumps aren’t included).

All this means that if you have long-term plans to stay in your property, then an air-to-water air source heat pump can be a great way to save money on your heating bills. However, if you’re planning on moving out of your property relatively soon, or are a considering an air-to-air air source heat pump, it may not be the best financial option for you.

It’s important to remember that air source heat pumps are at their most efficient when installed in very well insulated properties. If your property’s not very energy efficient, you may find that a heat pump won’t help you save money.