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Choosing Your Battery Storage System

When deciding which battery system best suits your needs and budget there are two types of systems to choose from.
1. AC coupled battery system
2. Hybrid battery system

We offer bespoke battery systems from leading battery storage manufacturers for domestic and commercial properties to suit your individual requirements.
Below are the pros and cons of each to help you decide which would be best for you.

Enphase home solar battery system

AC Coupled Inverter & Battery Systems

If you already have solar PV installed at your property and receive a feed-in-tariff then this is the best option to choose.

Fox ESS hybrid battery system of home solar energy.

Hybrid Systems

If you already have solar PV installed at your property and receive a feed-in-tariff then this is the best option to choose.

Choosing Your PV System

AC Coupled Inverter & Battery System

If you already have solar PV installed at your property and receive a feed-in-tariff then this is the best option to choose. An AC coupled battery system does not affect your feed-in-tariff payments by working independently from your existing solar PV.

Enphase home solar battery system

Pros of an AC Coupled System

– Ability to output power along side your existing solar PV inverter. In effect doubling the power available to meet the demand of your connected loads, this is also a good option for households who consume a lot of energy.
– Can be charged from the grid during cheaper night time tariffs for use during the day when electricity is more expensive.
– Works with or without solar PV.

Cons of an AC Coupled System

– Not quite as efficient as a hybrid inverter.

Fox ESS is a global leader in the development of solar inverter and energy storage solutions, engineered by some of the leading inverter and battery experts.

Fox ESS

Prices Start From – £4,995

Fox Ess 5kW AC Coupled Inverter With 5.8kWh Battery (1 x Master and 1 x Slave).

This is a scalable battery storage system. The modular design allows for maximum flexibility. Up to 1 x master and 6 x slaves can be stacked together giving a total storage capacity of 20.16kWh.

The battery chemistry is LFP [Lithium Iron Phosphate. They are built using LiFePO4 Prismatic cells. These are the safest type of lithium battery, they have very good structural and thermal stability. This means if you were to subject them to harsh temperatures or hazardous events like a short circuit or a crash they wont start a fire or explode.

5.8 kWh capacity
Scalable to 20.16 kWh
90% Depth of discharge
Large temperature tolerance
CAN/RS485 communication
High voltage
IP65 rated
Can be installed indoors or outdoors
Price Includes:
Full installation
All associated electrical works
DNO application
MCS certificate
Free Monitoring Platform
10 year manufacturer warranty
Enphase is a global energy management technology company that provides residential and commercial solar plus storage solutions.

Enphase

Prices Start From – £6,995

The Enphase system is classed as an all in one. Total usable capacity per battery is 5kWh which can be expanded up to four batteries increasing the storage capacity to 20kWh. It is a fully integrated AC coupled battery system which has six embedded micro inverters inside the battery. These are fully field replaceable should one ever fail. The failure rate of these micro inverters is very low, around 1 in 2000.

Battery chemistry is LFP, lithium iron phosphate. These batteries are among the safest on the market. They have superior thermal stability, making them resistant to thermal runaway even under extreme conditions. 

The Enphase system is widely recognised as one of the best in the world. If one microinverter was to ever fail the battery would continue to function perfectly on the remaining five, although at a reduced output. In the highly unlikely event three microinverters were to fail it would still continue to function on the remaining three. Enphase are confident in the reliability of their batteries, this is why they come with a 15yr warranty.

5 kWh capacity
Scalable to 20.0 kWh
Six embedded IQ8D-BAT microinverters
Large temperature tolerance
IP55 Battery enclosure
IP67 Microinverter enclosure
Can be installed indoors or outdoors
Best suited to be installed on an external wall or garage due to physical size.
Price Includes:
Full installation
All associated electrical works
DNO application
MCS certificate
Free Monitoring Platform
15 year manufacturer warranty
SolarEdge Technologies, Inc. is an Israeli company that developed a DC optimized inverter system.

Solar Edge

Prices Start From – £8,995

StorEdge 5kW AC coupled inverter with a SolarEdge home battery V2 10kWh battery.

SolarEdge is a premium product and highly regarded as having one of the best solar PV systems on the market today. They have delivered more than 3.7 million solar inverters and 89.6 million power optimizers across the world. The total capacity of shipped solar inverters is more than 31.0 Giga Watts.

We are offering this battery as an AC coupled system for people with existing solar PV or those who don’t have solar and just want to charge their battery at off peak rates for use during the day. By purchasing any SolarEdge product you get top quality, excellent customer service and a world leading technical support should you ever experience any problems.

Battery chemistry is NMC [Nickel, Manganese, Cobalt]. With an improved mechanical design, the battery passed the UL9540A test, making it one of the first residential batteries to meet the strictest standard for fire safety hazards. 

NMC 9.7kWh / 5kW Li-ion technology
Support up to 3 batteries per inverter for more power and capacity 100% depth of discharge
Superior system efficiency
Floor mounting or wall mounting
IP65 rated
Can be installed indoors or outdoors
Best suited to be installed on an external wall or garage due to physical size.
Price Includes:
Full installation
All associated electrical works
DNO application
MCS certificate
10 year manufacturer warranty on battery
12 year manufacturer warranty on inverter
Choosing Your PV System

Hybrid Inverter & Battery System

If your thinking of installing solar PV and would like the option to add a battery now or in the future then this type of system is worth considering. A hybrid inverter takes the place of a standard solar PV inverter and also has the ability to connect directly to a battery.

Fox ESS hybrid battery system of home solar energy.

Pros of a Hybrid System

– Charges the battery directly from DC power produced by the solar panels making it the most efficient.

– Cheaper than installing a standard solar pv inverter and an additional AC coupled battery inverter.

Cons of an AC Coupled System

– Output power from both the solar production and the battery is limited by the size of the hybrid inverter.

– If the inverter develops a fault you will loose both the solar production and the battery until the fault has been rectified.

Choosing Your PV System

How to Choose a Grid Connected Battery System

There are two options available when deciding which type of grid connected battery system best suits your requirements and budget:
1. AC Coupled Battery
2. Hybrid Inverter and Battery Combination

A hybrid inverter can output up to its rated power in kW day or night whether from solar, battery or both.

An AC coupled inverter can output up to its rated power in kW day or night from the battery but can also do this alongside a standard solar pv inverter which could also be outputting up to its rated power.

In regard to how much battery capacity you might need this can be calculated using the estimated annual consumption figure on your electricity bill. The ability to fully charge your batteries during the day from Solar depends on the size and orientation of your solar array, size of battery bank, power consumed during this time, weather and time of year.

Choosing the right amount of battery capacity to best suit your needs is designed bespoke to each individual customer. One size doesn’t fit all.

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If you would like to discuss either your requirements in more detail or would like a quote, please contact us. We work for both commercial and residential customers.

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