· SH Energy editorial
Buyers often compare capacity and price, then discover the pair will not communicate. The four checks below decide whether a battery and inverter can work together — and each one can be verified with a document before you pay.
1. The voltage window has to overlap
A lithium battery has an operating voltage range, not a single voltage. The inverter has a DC input range. If the battery's range sits outside the inverter's window — especially at the bottom — the inverter will disconnect early or refuse to charge, and the usable capacity drops without any fault code.
Compare the numbers directly: battery minimum and maximum voltage against the inverter's DC range, at the temperature you will actually operate in. Cold reduces voltage; heat changes limits. A pair that works on paper at 25 °C may fail at 5 °C.
2. Communication is a language, not a port
Both units may have CAN or RS485 and still not understand each other. What matters is the protocol and the firmware version on each side. Closed-loop operation lets the inverter read state of charge, charge limits and alarms; open-loop falls back to voltage thresholds.
Ask for the protocol document that names both the battery model and the inverter model, with the firmware versions. A generic “CAN compatible” statement is not evidence. If the document does not exist, plan for open-loop and say so in the design.
3. Current limits, not just capacity
A large battery can be limited by a small inverter's charge current, and a large inverter can exceed a small battery's continuous discharge rating. Check three numbers: continuous charge current, continuous discharge current, and the surge the inverter can demand.
This is where “it works but trips under load” comes from. The system passes commissioning, then fails when a pump or air conditioner starts because the battery's BMS limits current before the inverter expects it.
4. Phase and grid configuration
Single-phase, three-phase and split-phase systems need different inverter topologies. A hybrid inverter designed for one configuration will not become another by changing a setting. Confirm the site's phase arrangement first, then the inverter, then the battery.
Also confirm whether the system is AC-coupled or DC-coupled. The same battery can be suitable in one architecture and awkward in the other, especially when retrofitting an existing PV system.
What to verify before committing
- Battery voltage range vs inverter DC range, at operating temperature.
- Protocol document naming both models and firmware versions.
- Continuous charge and discharge current on both sides.
- Phase configuration and coupling architecture.
- A bench test of the exact pair, with a commissioning log.
Copy-ready compatibility request
If the pair is already installed
When a system is running but not behaving, the question changes from “will it work” to “what is actually wrong”. Start with the after-sales case path, and use the evidence checklist in what CAN and RS485 do not prove.
Where this fits your market
Phase configuration and import requirements differ by market. See South Africa, Nigeria and Iraq, or the after-sales page if the system is already installed.
If both units list CAN, are they compatible?
No. CAN is a physical layer, not a language. Two units can both have a CAN port and still speak different protocols. Compatibility needs the protocol document for the exact firmware version on both sides.
Is open-loop operation a fallback or a compromise?
It is a fallback. Running on voltage thresholds works, but the inverter cannot see state of charge or cell limits, so the system relies on conservative settings and loses usable capacity. It is acceptable as a temporary or low-cost configuration, not as a design goal.
Do I need the same brand for battery and inverter?
No. Mixed brands are common. What you need is evidence for the specific pair: voltage window overlap, protocol match, current limits and a commissioning test. Brand matching is a shortcut, not a requirement.
What is the cheapest way to reduce compatibility risk?
Buy the battery and inverter as a tested pair from one supplier, or insist on a bench test of the exact pair before shipment. The test costs far less than a container of equipment that will not talk to each other.
Discuss a compatibility enquiry
Send both model numbers, firmware versions and the documents you already hold to jimmy@sunhongenergy.com, or message the desk on WhatsApp. We answer with what exists for the exact pair, including gaps.
Scope
This guide describes technical checks, not a guarantee that any specific pair is compatible. Final compatibility and commissioning decisions remain with the manufacturers and the qualified installer.