SunWell Solar battery

A solar battery stores the electricity produced by solar panels so it can be used when the sun is not generating — at night, during outages, or when grid power is expensive. In a solar energy system it sits between the array and the loads, capturing surplus daytime generation and releasing it on demand. Modern SunWell batteries use LiFePO4 chemistry, which gives a long service life, stable thermal behavior, and deep discharge capability compared with older lead-acid designs. A battery lets a solar setup provide backup power, raise self-consumption of free solar energy, and shift usage away from peak tariffs. Sizing depends on daily consumption, backup needs, and whether the system is grid-tied or off-grid.

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Selection Guide

SunWell's battery range splits into five families, and the right one depends on capacity, space, voltage platform, and expandability.

Floor-mounted units are standalone cabinets or wheeled portable packs for sites where wall structure is uncertain. They cover roughly 5.12 kWh to 16.1 kWh at 51.2 V and rate 6,000–8,000 cycles at 70% SOH, suiting garages, utility rooms, telecom shelters, and small commercial spaces.

Wall-mounted batteries are the default when floor space is tight. The range spans 2.56 kWh to 10.24 kWh at 25.6 V, 48 V, and 51.2 V, at IP20 for indoor walls, pairing naturally with hybrid inverters.

Server rack cabinets pack high-voltage, high-capacity storage into a 19-inch form for C&I rooms: five voltage tiers from 384 V to 768 V and 107 kWh to 215 kWh, weighing 820–1,650 kg, needing qualified contractors.

Stacked modules clip together for grow-as-you-go capacity. Low-voltage 51.2 V stacks give 10.24–20.48 kWh and high-voltage 192–480 V stacks give 9.6–24 kWh, all IP65 for sheltered outdoor or garage use, rated 6,000 cycles at 70% SOH.

Gel batteries are sealed lead-acid for low-budget backup, tolerating 25–50% daily discharge and 3–6 years life, with no complex BMS.

Decision framework: estimate daily kWh and backup hours, then match form factor to space and voltage to your inverter. When comparing families, confirm the battery voltage against your inverter platform first, because low-voltage and high-voltage stacks are not interchangeable, and check the IP rating against your install location before you commit floor or wall space. Need megawatt-hour scale or project engineering? Look at the Energy Storage Container category instead.

Frequently Asked Questions

What does a solar battery actually do in my system?

A solar battery stores surplus solar energy and releases it when generation stops or demand spikes. It sits between your panels and your loads, providing nighttime power, outage backup, and self-consumption of free solar instead of exporting it to the grid. Without storage, a solar array only helps while the sun is shining.

How do I estimate the capacity I need?

Add up the watt-hours of the devices you want to power and multiply by the hours they run during an outage or overnight, then divide by 0.8 to stay in a healthy discharge window. A typical home covering lights, a fridge, and a router needs about 5–10 kWh; whole-home backup needs 15 kWh or more.

Floor-mounted or wall-mounted — which should I choose?

Choose wall-mounted when floor space is tight and you have a solid structural wall; it covers the smaller home capacities. Choose floor-mounted when wall load is uncertain or you need more capacity or mobility via wheeled units. Both use LiFePO4, so the decision is mainly space and capacity headroom.

When do I need a server rack or stacked battery instead of a wall unit?

Think about where the system will live and who installs it. A stacked battery grows in modules you can add yourself and sits in a garage or sheltered outdoor spot. A server rack cabinet is a contractor-installed commercial block that needs a machine room and a planned load path. Wall units are the home default until your needs pass roughly 10 kWh.

How long will a SunWell battery last?

SunWell LiFePO4 batteries rate 6,000–8,000 cycles at 70% state of health. At one full cycle per day that equals roughly 16–22 years before noticeable capacity fade, though temperature and discharge depth affect real life. Gel batteries in the range last 3–6 years with shallow cycling. Proper sizing and a cool, dry location extend service life.