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Solar System Acceptance Checklist: 10 Key Points for Beginners

2026-10-24

1. Visual Inspection: Flat board surface without cracks / Anti-corrosion treatment of bracket / Screws tightened without loosening. 2. DC Side: MC4 connector tightened and waterproof / Cables protected by conduit / Sufficient slack for easy maintenance. 3. AC Side: Independent circuit breaker + leakage protection / Bidirectional energy meter replaced / Terminal blocks tightened. 4. Grounding: Inverter casing / bracket / Grounding wire specification ≥ 4mm² continuous without joints. 5. Inverter: Normal grid connection and startup / Normal parameter display / Switching to off-grid mode within 20ms. 6. Monitoring: Successful APP binding / Data consistent with screen / Obstruction test alarm normal.

Can old and new batteries be mixed? Precautions for parallel expansion of energy storage systems (Introduction)

2026-10-24

1. Risks of Mixed Use: Internal resistance mismatch leading to uneven current distribution, BMS protocol incompatibility, and wasted capacity. 2. Expansion Methods: New battery of the same model/BMS master-slave mode/Independent system/Complete replacement 3. Operation Steps: Confirm inverter support → Individual activation test of new battery → Power off and connect → Debugging and monitoring 4. Common Problems: New battery overheating/System alarm mismatch/Incomplete charging/Discharging/Efficiency reduction 5. Solutions: Reduce load, update firmware, recalibrate BMS, set new battery to charge-only mode 6. Conclusion: Mixed use is generally not recommended. The optimal solution is to expand capacity using the same model, with an independent system as the second choice.

Can a cracked solar panel still be used? A detailed explanation of four levels of damage.

2026-10-23

1. Causes of cracks: Hail impact, thermal stress, installation pressure, handling bumps, aging. 2. Four-step assessment: Check crack location/shape/whether it is expanding/whether it affects power generation. 3. Level 1: Minor: Fine scratches/hairline cracks, impact <5%, no treatment required, continue use. 4. Level 2: Moderate: Obvious cracks that do not penetrate, impact 5%-15%, requires continuous observation. 5. Level 3: Severe: Through-crack/glass shattered, impact 15%-50%, must be replaced. 6. Level 4: Completely broken/frame detached, immediately disconnect power and replace.

Can solar energy systems still be used during consecutive rainy days? Energy storage configuration guide.

2026-10-22

1. Impact on power generation: Power generation drops to 10%-30% of sunny days on cloudy days, and only 1/5 of sunny days after a week of cloudy/rainy weather. 2. Three-stage effect: Daytime charging and discharging → Nighttime battery power supply → Battery depletion during continuous cloudy days. 3. Range reference: 10 kWh battery lasts 1-7 days, 20 kWh lasts 2-14 days, 30 kWh lasts 3-21 days. 4. Configuration recommendation: Designed to last at least three days, with a power rating slightly higher than the inverter. 5. Practical tips: Use high-power appliances during the day, pay attention to weather forecasts and plan ahead. 6. Extreme solution: A hybrid of photovoltaic + energy storage + diesel generation, suitable for "uninterrupted power" needs.

Is it worthwhile to buy an electric car and then install solar panels? In-depth analysis of charging costs.

2026-10-21

1. Charging Costs: 15 kWh per 100 km, approximately 1200-1500 RMB per year for 3000 kWh charging. 2. Solar PV Payback Period: A 5.5kW system generates 6000 kWh annually, yielding an annual income of approximately 3000-3400 RMB, with a payback period of 6-8 years. 3. Battery Configuration: 15-20 kWh battery for those with a fixed parking space and long commutes; fast solar charging is available for short commutes. 4. Applicable Scenarios: More cost-effective if you have a parking space, good orientation, and high electricity prices (Guangdong/Zhejiang/Shanghai). 5. Six Issues: Installation space, sunlight conditions, electricity price, charging capacity, residential stability, and policies. 6. In short: For those whose annual charging costs exceed 2000 RMB, installing solar PV is likely worthwhile.

How to wire an inverter? Installation precautions for home systems.

2026-10-20

1. DC Side Wiring: Series and parallel design, MC4 connector connection, DC cable selection, and operation after shielding the circuit board. 2. AC Side Grid Connection: Dedicated circuit + independent circuit breaker, bidirectional energy meter, three-phase balanced connection. 3. Grounding and Lightning Protection: Inverter casing grounding, bracket grounding, DC/AC surge protector installation. 4. Communication and Monitoring: WiFi signal testing, CAN/RS485 communication line connection, power sensor installation. 5. Safety Reminders: No "neutral wire" for DC power; operation must be performed by a certified electrician; acceptance inspection includes anti-islanding protection. 6. Acceptance Checklist: MC4 connector pull test, grounding resistance test, APP data synchronization confirmation.