Single-phase inverters FOX ESS

FOX ESS: a fit for every single-phase home

FOX ESS single-phase inverters: hybrid and AC-coupled

FOX ESS single-phase inverters are built for private homes and apartments with single-phase grid connections — the most common connection type for residential property in Ukraine, which is why the brand's range in this category is the widest across all inverter types. The line spans thirteen models from 5 to 10.5 kW, split into two fundamentally different types: hybrid inverters in the H1 and KH series, and AC-coupled inverters in the KA series.

The H1/KH (hybrid) and KA (AC-coupled) series

The hybrid models H1-5.0-G2-WL, H1-6.0-G2-WL and the KH series (KH7-KH10.5) combine battery charging from solar panels, energy conversion for the home grid, and automatic source switching in a single device. This is a complete solution for anyone building an off-grid or backup power system from scratch: no need to buy a separate charge controller or coordinate several different devices working together.

The AC-coupled KA series (KA7-KA10.5) solves a different problem — adding energy storage to an existing grid-tied solar system. If an owner already has a grid inverter without battery-charging capability, fully replacing the system with a hybrid unit would cost far more than connecting an AC-coupled inverter on the AC side, which manages only battery charge and discharge without interfering with existing equipment.

Sizing power for peak household load

Choosing the right power rating within the range — from 5 to 10.5 kW — should be based on peak simultaneous household consumption, not average. An air conditioner, an electric stove, a water heater and a pump running at once during a summer heat wave or morning peak hours create a load well above the daily average, and it's this peak the inverter needs to be sized for, not the comfortable average figure from an electricity bill.

The second-generation G2 platform, used in the H1 models, provides a wider operating voltage range for solar panel input current compared to earlier generations — meaning more stable system performance even under partial array shading or a non-standard roof mounting angle, when panel output voltage fluctuates through the day.

The G2 platform, FoxCloud monitoring and surge power

Peak (surge) power is a spec that often gets overlooked among rated figures, but it directly affects system stability: the inrush current of an air conditioner compressor or a well pump at startup can be several times its rated draw, and if the inverter isn't sized for that brief peak, it will trip precisely at the moment equipment starts up, not during stable running.

The price gap between adjacent power tiers within the range (say, KH7 versus KH8) is usually much smaller than the price gap between connection types (hybrid versus AC-coupled), so buying extra power "just in case" rarely pays off once the household's actual consumption profile is already known from a full year of electricity bills.

All FOX ESS single-phase inverters support remote monitoring via the FoxCloud platform, letting you track generation and consumption, battery charge state, and receive fault alerts through a smartphone app — useful both for an owner who wants to check the system without walking to the utility room and for a service company managing several sites at once. Historical readings from previous months also help plan system expansion — for instance, when to add another panel or storage module.

It's also worth factoring in the physical mounting space when narrowing down a model: hybrid units in the H1 and KH series carry more internal electronics than the AC-coupled KA series and sit slightly larger on a wall, which matters in a compact utility closet where every centimeter of clearance for ventilation and cabling counts.

Compare power, connection type (hybrid or AC-coupled), surge capacity and G2 platform availability, and pick the FOX ESS single-phase inverter that covers your home's actual needs without extra power reserve you'll end up paying for every time you expand the system.