For a long time, home solar with a battery was a bit of a building-block project. An inverter from one brand, a battery from another, a separate box for monitoring, and a fair amount of wiring joining it all together in the garage or utility room. It worked, but it was rarely tidy, and installation often took longer than it needed to.
At DES Renewable Energy we have seen the market move quickly towards all-in-one systems. Homeowners across Dorset, Hampshire and Wiltshire want something simple, reliable and neat. That is where the GoodWe ESA comes in. It is the system we fit more than any other, and this guide explains why.
If you are considering a home battery or a full solar upgrade, here is what the ESA is, what it does well, and who it suits.
Thinking about a battery or a full solar upgrade? DES are MCS certified GoodWe installers covering Dorset, Hampshire and Wiltshire. The GoodWe ESA suits some homes better than others, and the quickest way to know if it is right for yours is a free, no-obligation survey. Get your free quote here.
1. An all-in-one design: clean, simple, integrated
ESA stands for Energy Storage All-in-one. Instead of an inverter on the wall and a battery somewhere else, the ESA is a single vertical tower: the GoodWe ESA hybrid inverter sits on top of stackable battery modules.
The inverter, battery management and storage are designed to work together as one product, which makes installation quicker and the finished result much tidier. For you, that means less time with engineers in your home and a cleaner looking system.
How it compares:
- Tesla Powerwall 3: one 13.5 kWh unit with a solar inverter built in, and it needs Tesla’s Backup Gateway 2 for backup. Excellent if around 13.5 kWh suits you. The ESA lets you choose your capacity in smaller steps.
- Sigenergy SigenStor: another modular stack, and the one people increasingly ask us about. It has finer battery sizing and strong three phase options. We compare the two in detail in Sigenergy vs GoodWe.
- BYD: a strong competitor with a similar stacked layout. See how the leading home batteries stack up in our Tesla, BYD and Sunsynk comparison.
2. Backup in a power cut: a 4 ms switchover
Power cuts in the south of England are usually short, but they can still knock out a home office, the Wi-Fi or a freezer at the wrong moment.
With a GoodWe gateway fitted, the ESA switches to backup power in around 4 milliseconds. That is quick enough that most households will not notice it happen: lights stay on and the router stays online. How much of the house you can run is set by the inverter size and the battery, so we plan the backup circuits with you at survey. For the wider picture, read our guide to solar panels in a power cut.
3. Safety first
“Is the battery safe to have in my house?” is the question we hear most from families.
The ESA inverter includes DC arc fault protection (AFCI), which monitors the solar wiring for the electrical signature of an arc and shuts down if it detects one. The batteries use lithium iron phosphate (LiFePO4) cells, the chemistry most of the home battery market has moved to because it is thermally stable and much less prone to overheating than older lithium chemistries.
4. A battery that grows with you
One of the most common mistakes we see is a battery that is too small for what the household will need in a couple of years, once an electric car or a heat pump arrives.
The ESA is modular. We normally fit GoodWe ESA 8.3 kWh battery modules, so the usual sizes are 8.3, 16.6 or 24.9 kWh, and more modules can be added to the stack later rather than replacing the whole system.
| Size | Battery | Typically suits |
|---|---|---|
| One module | 8.3 kWh | Smaller households, modest evening use, someone home in the day |
| Two modules | 16.6 kWh | A typical 3 to 4 bedroom home, or one with an EV or high evening demand |
| Three modules | 24.9 kWh | Larger homes, heat pumps, or more than one EV |
Already have panels? See whether it is worth adding a battery to an existing solar system.
5. Making the most of your solar
Because the ESA is a hybrid inverter, your solar panels connect straight into it. Daytime solar can power the house, charge the battery or go to the grid, without passing through a second inverter first. That keeps conversion losses down.
We design each array with the inverter in mind, sizing the panels within GoodWe’s limits so the system still produces useful power on grey winter days, which matters in the UK.
6. Why it suits homes in the south of England
We install across Dorset, Hampshire and Wiltshire, and the ESA suits the homes we work on for three reasons:
- It is compact: plenty of homes here have limited utility space. The tower fits neatly into a garage or utility room without looking like industrial machinery.
- It can go outside: the unit is IP66 rated, so if there is no room indoors it can be mounted on an outside wall.
- It is quiet: the design is fanless, so it will not disturb you or the neighbours if it sits near a bedroom or a patio.
7. What will it save you?
Every home is different, so we do not quote a one-size-fits-all saving. What a GoodWe ESA saves depends on your electricity use, how much solar you generate, your tariff and your export rate under the Smart Export Guarantee.
As a rule, a well sized battery earns its keep by storing solar you would otherwise export cheaply, and on a time of use tariff by charging at off-peak rates and covering the expensive evening peak. For a quick personalised estimate, try our solar savings calculator, then we can firm it up at survey with your real bills.
GoodWe ESA or Sigenergy?
We install both, and they are both excellent. For most single phase homes that want a quiet, proven all-in-one battery, the GoodWe ESA is very hard to beat. For three phase homes, complicated roofs or people who want EV charging and the battery in one app, the Sigenergy SigenStor can have the edge. Read our honest Sigenergy vs GoodWe comparison, or see our Sigenergy installer page.
Is the GoodWe ESA right for you?
If you want a system that looks neat, handles power cuts without fuss, and can grow as your energy needs change, the GoodWe ESA is a strong choice. It is the closest thing to set and forget home energy storage we fit.
We do not believe in one size fits all. We will look at your roof, your bills and your plans to see whether the ESA is the right fit for your home.
Want to see what a GoodWe ESA could do for your home?
Contact our team for a free, no-pressure site survey. We cover Dorset, Hampshire and Wiltshire with our own employed installation teams, and we will give you a fixed written quote.
About the Author: Jason Brown is the Director of DES Renewable Energy Ltd. With years of experience in the UK solar industry, Jason focuses on bringing high-efficiency, reliable energy solutions to homeowners across the South of England.