1. Installation Discount  
A. Valid from 12:00 AM PDT on June 8, 2026, to 11:59 PM PDT on July 3, 2026.  
B. Customers purchasing Smart Home Panel 3 are eligible for an automatic $900 discount on installation services related to Smart Home Panel 3. The discount will be applied automatically at checkout.
C. This Installation Discount is non-stackable with other discounts.  
D. Installation Service Scope  
VIP Customer Service: VIP support for installation and usage inquiries, etc.
Professional Installation Service: 4-step professional installation process
Installation Service Fee Coverage: The standard Installation Service Fee ONLY covers the installation labor costs. For more installation information, refer to our Installation T&C
Free Sub Panel Removal: We'll remove your existing sub panel at no extra charge.
E. Installation fees are calculated based on the installation ZIP code. Pricing may vary by region and will be reflected at checkout.
2. Exclusive Accessory Discounts for DELTA Pro Ultra Series Customers
A. During the Promotion Period, customers who purchase a DELTA Pro Ultra or DELTA Pro Ultra X are eligible for additional discounts on selected recommended accessories, as outlined below.
B. Eligible accessories and discount tiers:
- 400W Portable Solar Panel
  -  Purchase 3-5 units: Extra 5% off 
  -  Purchase 5 or more units: Extra 10% off 
- DELTA Pro Ultra Series Extra Battery
  -  Purchase 2–3 units: Extra 5% off 
  -  Purchase 4 or more units: Extra 7% off 
C. The discount is applied automatically at checkout for eligible items and quantities.
D. This offer is valid only during the Promotion Period and cannot be combined with other accessory-specific promotions unless otherwise stated.
3. Extended warranty service
During the Promotion Period, when you purchase and successfully pay for the order of DELTA Pro Ultra X and related bundles, you will get a 6-year free warranty: 5 years standard warranty plus an additional 1 years extended warranty. 
*This extended warranty is only valid on Delta Pro Ultra X and Delta Pro Ultra X-related bundles.