Question 1

How long do home solar batteries last?

Accepted Answer

How long home solar batteries last depends on the type of battery you have and how often it’s charged and discharged (when electricity is fed into it, then used later on). Generally speaking, a home solar battery should last between 5 and 15 years. Lithium-ion batteries last longer than lead acid batteries. Lithium-ion batteries are more common these days because they’re more cost effective. A lead acid battery is the cheaper option at around £2,000, but it’s likely to last between 5-8 years. On the other hand, a lithium-ion battery may set you back around £4,000, but will last between 11-15 years. So you can see that it’s well worth choosing a lithium-ion home solar battery. It’s also worth considering that a solar battery’s lifespan will be reduced if you over-discharge it. When your home solar battery is installed, you’ll be left a manual which will tell you its depth of discharge, or DoD. This means how much you can use the battery before recharging it – it's not as simple as letting the battery run down to 0% then charging it again. In fact, this can significantly shorten your battery’s lifespan. If your solar battery system’s DoD is 80% and its capacity is 5kW, make sure you charge it before you use up 4kW to help prolong its life. Luckily, most lithium-ion batteries have a DoD of 80% or more, so you don’t need to worry about not being able to use much of the electricity stored in your home solar battery. This is another reason to use them over lead acid batteries, because their DoD can be as low as 50%.

Question 2

How much do solar batteries cost?

Accepted Answer

How much solar batteries cost depends on the brand and type of battery and its capacity. At the moment, the cost is quite high because the technology is still new – but they will probably reduce, just like we saw the cost of solar panels reduce as the technology became more popular. It’s a great idea to get a solar battery installed with your solar panel system if you’re out most of the day. If you didn’t have a battery, all that electricity would simply go to the National Grid – but if you have a storage system, then while your solar panels are generating electricity in the day, it would get stored in the battery ready for you to use when you get home. Lithium-ion solar batteries are the most widely-used ones at the moment because they generally have a higher capacity and are more cost-effective. For a 3-4kWh battery, which would store enough electricity for a typical 4kW solar panel system, it will set you back an average of £3,400. If you need a larger battery, it could cost anywhere up to £6,000. Lead acid batteries are cheaper, and it can seem tempting to ask an installer to fit one for you – but they aren’t cheaper in the long run. While a 4kWh lead acid battery may only cost around £2,000, their life cycle is only around 1,800 cycles. A lithium-ion battery that costs around £4,000 would have a life cycle of about 4,000 cycles. That means that while the upfront cost is more, you won’t have to replace it as quickly as a lead acid one.

Question 3

How much is the Powerwall 2?

Accepted Answer

The Tesla Powerwall 2.0 is the second solar battery storage system from Elon Musk’s EV and clean energy company. It’s larger and more expensive than the original Powerwall, but it can store more electricity. So how much is the Powerwall 2.0? With installation, it will set you back between £6,500 and £9,000. But is it worth it? We’ll go through some of the top features so you can make your decision. The Powerwall 2 has a huge useable capacity of 13.5kWh. Most other solar batteries on the market have a capacity of around 4-6.5kWh, so it’s no surprise that it’s also one of the most expensive. If you’ve got a standard-size solar panel system on an average-sized home, you might not need a battery with such a big storage capacity. The Tesla Powerwall 2.0 is the only solar battery available in the UK to provide your home with an uninterruptable power supply (UPS) if you add the Backup Gateway 2. This means that if there’s a power cut, you won’t lose power – because your battery will keep running. It can also scan the weather forecast, so if there’s a storm it will ensure that your solar panels charge the battery in case you get a power cut. So while the Powerwall 2 is the probably the most expensive solar battery you can buy in the UK, if you live in a part of the country with a particular problem the power cuts or you have a large solar panel system, it might just be worth spending the money on it.

Question 4

Which solar battery is the best?

Accepted Answer

With so many different solar batteries on the market these days, it can be difficult to know which solar battery is the best. Luckily, we’ve picked out some of the best solar batteries on the market so you can take a look at their stats and figure out which one is best for you. Powervault 3: 8 kWh model This lithium-polymer solar battery has a useable capacity of 8 kWh and a depth of discharge (Dod) of 100%. It’s covered by warranty for 10 years. Cost: From £7,020 Tesla Powerwall 2.0 The famous Tesla Powerwall has a huge useable capacity of 13.5 kWh and also has a 10-year warranty, with a guarantee that it will work at 70% capacity during those 10 years. It’s a lithium-ion battery. Cost: From £6,500 Powervault 3: 4 kWh version This more modest solar battery from Powervault has a capacity of 4 kWh, but benefits from the same warranty length and DoD as its 8 kWh brother. Cost: From £4,470 SolaX 3.3 This more affordable solar battery from SolaX has a 10-year warranty and a good DoD of 90%. Cost: From £4,010 LG Chem RESU 6.5 LG are an up-and-coming player in the solar market and their 6.5 kWh battery is one of the most affordable on the market. Its DoD is 90% and it comes with a 10-year warranty. Cost: From £3,043 To decide which solar battery is best for you, you need to consider: The power of your solar panel system – there's no point buying a higher capacity battery if your system will never generate enough electricity to charge it How often you think you will need to charge your battery Your budget Whether you care about having the latest technology and a recognisable brand name When you’ve made these decisions, you can narrow down your choices. It’s also worth asking a few MCS-registered installers for their opinions on what they think would be best. Of course, they want to sell you whichever brand they supply, but they probably chose this for a reason. Ask them to give you a few pros and cons for the brands they recommend and see if this matches up with your research.

Avg. price low	Avg. price low £3,080
Avg. price	Avg. price £3,850
Avg. price high	Avg. price high £5,390

	Labour cost	£850
	Material cost	£2,900
	Waste removal	£100

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