Home Products Cases Testimonials Factory FAQ Blog Contact Get Quote
📖 FAQ

Frequently Asked Questions

Everything B2B buyers need to know about working with SunStone Energy

📖 General B2B Questions

Common questions from first-time buyers and long-term partners

What is the minimum order quantity (MOQ)?
Sample order: 1-3 units for testing.
White-label: 10 units per model.
OEM custom: 20-50 units (depending on customization level).
OEM with new mold/tooling: 100+ units.
What certifications do your products have?
All products are fully certified: CE (EU), UKCA (UK), VDE (Germany), IEC62619, UL2743 (US), UN38.3 (transport), RoHS, and FCC. Full certification documents provided for customs clearance. We can also assist with regional certification for specific markets.
How long does production and shipping take?
Production: 25-35 days (sample order 7-10 days).
Sea freight: 12-14d to US West Coast, 18-22d to EU (Rotterdam).
Air freight: 3-5 days (for urgent orders, higher cost).
Express (DHL/FedEx): 5-7 days for samples.
What is your after-sales service policy?
5-year warranty on all products. Spare parts warehoused in EU (Rotterdam) and US (Los Angeles). Remote technical support available 24/7 for partners. Full RMA process with replacement units shipped within 48 hours of confirmed defect.
Can I visit the factory?
Absolutely! Our facility is located in Shenzhen's Nanshan district, 30 minutes from Shenzhen International Airport. Video tours also available for remote partners. We host factory visits year-round — just schedule in advance. Schedule a visit →
What are your OEM/ODM capabilities?
Full OEM service: Custom design, logo, packaging, user manual, and white-label APP. MOQ from 20 units. Engineering support for custom BMS firmware, hardware modifications, and certification assistance. We've completed 15+ OEM projects for brands in DE, UK, US, AU, and NL.
What payment terms do you offer?
New partners: 30% deposit, 70% before shipment (T/T).
Established partners: Negotiable terms up to L/C or 50/50 payment.
Sample orders: 100% payment with order.
We accept T/T, L/C, and for established partners — net-30 terms available.
Do you offer exclusive distribution agreements?
Yes, we offer exclusive distribution rights for specific territories with committed volume targets. Current exclusive partners in DE, NL, and AU. Contact us to discuss your market and volume commitment.

📦 Shipping & Logistics

Everything you need to know about getting products to your warehouse

Shipping MethodDestinationTimeCost (approx)Best For
Sea Freight (FCL)US West Coast12-14 days$3,500-5,000/40ftLarge orders 100+ units
Sea Freight (FCL)EU Rotterdam18-22 days$4,000-6,000/40ftLarge orders 100+ units
Sea Freight (LCL)Worldwide14-25 days$150-300/CBMMedium orders 10-50 units
Air FreightWorldwide3-5 days$5-8/kgUrgent orders
Express (DHL/FedEx)Worldwide5-7 days$8-12/kgSamples 1-3 units

Still Have Questions?

Our B2B sales team responds within 24 hours