Does every five-bedroom home need a 10kW system?

No. Bedroom count is only an indication of property size. The correct capacity depends on daily energy use, simultaneous loads, motor starting power, backup priorities, available roof area and the required backup duration.

How many kWh are stored in two 300Ah batteries?

Amp-hours cannot be converted to kWh without the battery voltage. If each battery is rated at 51.2V and 300Ah, two would provide about 30.72kWh of total nominal energy. Ask the supplier to state voltage, amp-hours, nominal kWh and expected usable kWh.

Why is a 7.2kWp array paired with a 10kW-class system?

The 7.2kWp figure is the peak rating of the twelve solar modules, while 10kW describes the system or inverter power class. Final matching depends on the inverter's input range and MPPTs, the batteries, local solar conditions and the intended load strategy.

How long will the batteries run the whole house during an outage?

There is no responsible fixed answer without the battery voltage, usable energy and actual outage load. Send us the appliances that must remain on and their expected operating time, and we can estimate a practical backup plan.

What should be confirmed before installing in a three-storey house?

Confirm each floor's electrical distribution, the critical-load circuits, cable routes, equipment weight and service space, roof structure, drainage, shading, wind conditions and salt exposure before the final design is issued.

Three Storey Home Solar in St Peter Montserrat

Reinforcing bars still project from the concrete roof around the panels at this St Peter property. Indoors, inverter and distribution equipment is grouped on a yellow wall, with two batteries underneath. The installation has to fit both an existing roof and an existing indoor wall space.

The three storey home has five bedrooms and three bathrooms, with a refrigerator, lights and television among its daily appliances. We completed installation and commissioning in three days, connecting twelve 600W panels, 10kW class single phase equipment and two 300Ah lithium batteries.

Panels on a concrete roof with exposed reinforcing bars nearby, and two batteries below wall mounted equipment inside a St Peter home.

Household electricity across several floors

Rooms on different floors are used at different times. Lights and television follow activity in the home, while refrigeration continues throughout the day. Electricity from the system ultimately serves those rooms and appliances through the house's distribution circuits.

The 7.2kWp rooftop array generates during daylight, and indoor batteries retain some energy for later use or an external outage. The floors and rooms supplied depend on the actual wiring; a three storey building does not necessarily need a separate solar system on each floor.

Centralising the equipment connects the rooftop array, storage and house distribution in one installation. Evening demand will differ when only a few rooms are occupied compared with several rooms being used together.

Working with the roof as it stands

The projecting bars show that this is not an empty, idealised roof plan. Panel boundaries and routes for installation or maintenance need to be set out around the actual features. The bars do not establish a plan for another floor, but they help explain why a layout for one flat roof cannot simply be copied onto another.

Indoors, the equipment is brought together in one place and connected to the home's distribution. The result is a site-specific installation linking the available roof with household electricity on different floors.

Plan Your Solar Project with Sunchees

Founded in 2008 and based in Foshan, Guangdong, China, Sunchees develops its own inverters and lithium batteries and provides customised solar power and solar air conditioning solutions for homes and businesses. We support OEM requirements and your choice of solar panel brand, with remote installation guidance throughout the process, from equipment configuration to on-site installation support.

If you are considering solar for your home or business, share your project location, building photographs and everyday electricity needs with us. We can discuss a system and installation arrangement that suits the site and how you use it.

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