How to Get Solar Energy to a Battery: Step-by-Step Guide + Inverter & Controller Tips

2025-06-03

Solar energy technology is booming, with electricity generation increasing year after year. But how do you get power from the source to the energy storage system (ESS) and then to the load? This process is called power delivery. It’s simple in concept, but complex in practice, as the amount and consistency of power can change unpredictably, and system power levels can vary.

How Solar Charges a Storage Battery

One of the great conveniences of battery energy storage is that it can be used alone or in conjunction with the grid as a backup or backup source during peak demand periods

Getting Power Out

Putting energy into the battery is only part of the challenge for a BESS. The system is designed to deliver the power stored in the battery to the load, typically using a 120/240VAC line to power devices and systems.

The export function requires a DC/AC inverter, which converts the battery’s DC output into line-compatible AC. Like the electronics between the power source and the battery, this inverter is not a “one size fits all” device. Engineers must consider the inverter topology and design, as well as the many design challenges and trade-offs. Although there is no formal definition, experts often divide inverters into three power and feature categories: low power, medium power, and high power.

Microinverters (Low Power)

Rated between 50W and 400W, low-power microinverters integrate individual inverters and MPP trackers into each solar panel and are more efficient than string inverters. They require very little DC wiring, but require a lot of AC wiring. Therefore, this type of inverter is only suitable for small systems.

String Inverters (Medium Power)

String inverters are a medium-power configuration that ranges from 1kW to 20kW. In this method, solar panels are connected in series with multiple inverters, usually one for each panel. This method is highly efficient because each set of string inverters can operate independently at a maximum power point.

Central Inverters (High Power)

Central inverters are high-power configurations that range from 20kW and above. This approach connects multiple sets of string inverters in parallel, with only one inverter for each set of solar panels. Because the voltages of the string inverters are different, engineers add special diodes to drive the panels to their maximum power. However, diodes have inherent losses that reduce efficiency. As a result, the central inverter may not be able to drive all solar panels to their maximum power point.

Renewable energy has brought new opportunities for power control in areas such as intermittent power sources and power delivery architectures. Connecting solar panels to batteries with simple controllers and using batteries for power may work occasionally, but there are also performance drawbacks, safety issues, and efficiency issues.

Instead, choosing the right controller and DC/DC in the energy storage battery management path will get better results. Engineers should optimize the selected DC/DC inverter to ensure performance efficiency, consistency, long life, and resilience.

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