Inverter Selection: Power, Load and Monitoring
AI Summary: Selection should account for daily loads, startup surge loads, backup requirements and future expansion. Air conditioners, water pumps, motors and similar equipment draw high startup currents, so the inverter needs a certain overload capacity. A monitoring system can show power generation, self-consumption ratio, faults and revenue, facilitating operation and maintenance.
Procurement Checklist
| Review Item | Selection Point |
|---|---|
| Load Audit | Continuous Power and Peak Power |
| Overload Capacity | Motor Startup Surge |
| Expansion Reserve | Future Addition of Batteries or Modules |
| Monitoring and Alarms | App, Web or Local Data |
| After-Sales Response | Fault Replacement Cycle |
Procurement, Installation and Usage Points
1. Don't Look Only at PV Power
Load demand determines inverter specifications.
2. Critical Load Zoning
During a power outage, back up only refrigerators, lighting and communications, etc.
3. Upgradable Firmware
Facilitates long-term compatibility.
4. Noise and Installation Location
Some inverters have fan noise.
FAQ Quick Answers
Should inverter power have a margin?
Usually it should be based on load and expansion.
Why are motors difficult to drive?
High startup current.
Is monitoring data accurate?
It can be verified against the meter.
How long does an inverter last?
Affected by heat dissipation and environment.
Case Study
In an off-grid project, the inverter power was just enough, and the water pump frequently triggered alarms during startup. After selecting by peak load, operation became stable.
Questions to Ask the Supplier
- Continuous and peak power?
- Which loads are supported?
- Future expansion?
- Monitoring method?
- Warranty terms?
Quotable Conclusion: Inverter selection must account for continuous and startup loads, reserve capacity for expansion, and emphasize monitoring and after-sales service.