Hybrid Inverter and Battery RFQ: What Buyers Should Specify
A useful hybrid inverter and battery request for quotation describes the job the system must do, the equipment already on site and the evidence needed to confirm the proposed combination. State power in kW and energy in kWh separately, identify the required operating and backup functions, and ask for exact models and matching documents.
Use this checklist to prepare a buyer brief for an EPC, installer or supplier. The project specialist must confirm the system design and local requirements before ordering; a catalogue category or matching brand name does not confirm that two products work together.
1. Describe the project and its operating purpose
Give the delivery country, project location, quantity of systems and whether this is a new installation, an expansion or a replacement. Explain the intended use: storing solar generation for later use, supplying selected loads during outages, or another documented project requirement.
List existing solar equipment, inverter and battery models where relevant. State whether grid connection or a generator forms part of the project. If a detail is unknown, mark it as pending and ask what information the project team needs to provide.
2. Keep power and energy requirements separate
Power, normally expressed in kW, and stored energy, normally expressed in kWh, answer different questions. The US Department of Energy explains this distinction. A battery energy figure is not an inverter power rating.
Source: US Department of Energy
Ask the project team to provide the required continuous power, any relevant short-duration load requirements, the desired usable energy and the conditions those figures assume. Ask suppliers to distinguish nominal from usable battery capacity and identify limits that apply to their proposed configuration. Do not estimate supported loads or backup duration from a headline kWh figure alone.
3. Specify what must work during an outage
If backup is required, identify the essential loads, required duration and whether selected circuits or the full site are in scope. Ask the supplier to state the documented backup capability, any transfer arrangements, additional equipment and limitations for the exact proposed system.
The Australian Government battery guide explains that outage backup depends on system capability and configuration. Do not assume every battery system provides it. Have the project specialist confirm the complete arrangement, including any loads that cannot tolerate an interruption.
4. Request evidence for the exact inverter and battery pair
Require the complete manufacturer model codes, suffixes and relevant revisions for both products. Record the phase and voltage requirements supplied by the project team, and ask for the manufacturer evidence covering the proposed battery configuration, communication and any firmware or accessory conditions.
Compatibility documents apply to specified products. For example, this Growatt approved-battery document, issued in November 2024, names particular inverter and battery models and communication settings. It is an illustration of model-specific evidence, not confirmation for other Growatt families or stock offered on pv.market. Request the applicable document for the exact supplied equipment.
Example: Growatt battery document
Use the model and document verification guide to record sources and unresolved differences. Keep alternatives separate and obtain confirmation before accepting a substitution.
5. Define the complete quoted scope
Ask the supplier to list the inverter, battery modules and configuration, control or communication components, monitoring, accessories and any separately quoted equipment. Distinguish equipment supply from design, installation and commissioning services. Record what is included, excluded or still pending.
Provide the installation environment and any project constraints for specialist review. Request applicable datasheets, manuals, warranty terms and project documents. Ask who provides technical support and which entity issues each warranty; do not assume every component has the same warranty or support arrangement.
6. Make the commercial request clear
Give a quantity and sales unit for each item or complete system. State the destination, quotation deadline and required delivery date separately. Ask for current availability, quote validity, payment terms and a clear delivery scope. Keep an estimated dispatch date separate from expected arrival.
Use the supplier quotation comparison guide once offers arrive. Compare the same confirmed scope, and keep unknown costs or specifications pending until answered.
7. Copy these fields into your buyer brief
- Project country and location; new installation, expansion or replacement.
- Purpose; existing equipment and exact model references.
- Required power in kW; desired usable energy in kWh; project-team assumptions.
- Phase and voltage requirements; essential loads and backup needs.
- Proposed inverter and battery models, configuration and compatibility evidence.
- Included components, services, documents, warranty and support contacts.
- Item quantities and units; destination; quote deadline; required delivery date.
- Open questions, acceptable alternatives and the person responsible for technical review.
Browse hybrid inverter offers and lithium battery offers to identify options for review. Listing them together does not certify compatibility or reserve stock.
When your brief is ready, request a project quotation. If the exact models are undecided, state the confirmed requirements and clearly identify what still needs the supplier and project team to resolve. The general RFQ guide explains how to organise the request.
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