01 / Define the scopeCompare suppliers against the same written requirement.
A useful supplier comparison starts with one buyer brief used for every quotation. Without a common destination, voltage, phase, load, backup target, quantity and documentation list, two offers may describe materially different systems.
Separate product supply from final site engineering. A manufacturer can recommend compatible equipment, while the project designer and local installer must confirm the site electrical design, protection, installation and regulatory requirements.
Market
Destination country, delivery location, electrical standard and required documents.
Application
Home backup, off-grid property, productive use, commercial self-consumption or critical-load backup.
Electrical data
Phase, nominal voltage, frequency, running load, surge load, PV array and generator or grid conditions.
Commercial data
Quantity, requested schedule, OEM scope, packing requirements and target order sequence.
Verify the inverter, battery and PV as one system.
Do not evaluate the inverter, battery and solar array independently. Confirm battery voltage, charge and discharge limits, BMS communication, PV voltage window, maximum PV current, AC output, surge behavior and operating modes for the selected models.
Inverter
Rated and surge power, phase, AC voltage, PV input limits, generator support and monitoring.
Battery
Nominal and operating voltage, usable energy, current limits, BMS protocol and expansion rules.
Communication
Exact supported CAN or RS485 protocol and the cable or settings required for the model pair.
Protection
Required DC and AC isolation, overcurrent, surge protection, earthing and site switchgear scope.
Ask for model-specific evidence, not general claims.
A logo or broad certificate statement does not prove that every model is suitable for every market. Ask the supplier to identify the exact model, document name, standard, issuing body where applicable and whether the document is current and relevant to the destination requirement.
Datasheet
Model-specific electrical limits, operating conditions, dimensions and installation requirements.
Compatibility
Written confirmation for the selected inverter and battery combination.
Labels and packing
Product label, carton marks, manuals and OEM artwork approval method.
Export documents
Confirm the commercial, transport and product documents required for the destination and shipment method.
Put the order-specific commitments in writing.
MOQ, sample availability, price, warranty, lead time, branding, inspection and shipping terms vary by product and order. Treat website statements as general capability information and place the final commitments in the quotation, specification, artwork approval and sales agreement.
Quotation scope
Exact models, quantities, included accessories, unit basis, currency and quotation validity.
Schedule
Approval milestones, production assumptions and the event that starts the quoted lead time.
Inspection
Inspection scope, acceptance criteria and evidence to be supplied before shipment.
Support
Installation documents, remote assistance route, warranty process and excluded site responsibilities.
Pause when the offer cannot be checked.
Low price alone is not evidence of a complete or compatible offer. Recheck a quotation when the model is missing, capacity is stated without voltage, inverter power is confused with battery energy, required accessories are omitted, or compliance and delivery claims are not tied to written conditions.
No exact model
The buyer cannot verify electrical limits, documentation or compatibility.
Unqualified performance
Output, backup time or cycle claims lack stated conditions and system assumptions.
Undefined exclusions
Protection, cables, switchgear, commissioning or freight may be outside the quoted scope.
Universal approval claims
Regulations differ by country, utility, product and project; confirmation must be market-specific.