B2B Partnership Success Stories

The Partner: A mid-sized German energy distributor with 500+ installer network across DE, AT, and CH.

The Challenge: Needed a fast-to-market balcony ESS solution with white-label branding, EU certifications, and Rotterdam warehousing. Wanted full APP rebranding and German-language support.

Solution: SunStone deployed the ESS-2000 with custom branding, German-localized APP, VDE certification, and 500-unit initial stock in Rotterdam warehouse. Logo, packaging, and manual all in German/English.

Results: Launched in 3 weeks from first contact. Sold 500+ units in first 6 months through installer channel. Repeat order of 1,000 units placed. Partner reports 32% gross margin at retail €3,999.

The Partner: Australian solar installer with 5 branches in QLD, NSW, and VIC. Specializes in off-grid and hybrid systems.

The Challenge: Needed a reliable 10kWh+ household ESS with custom firmware for Australian grid compliance (AS/NZS 4777), Sydney warehouse stock, and remote monitoring for their service team.

Solution: Custom ESS-10000 firmware with AU grid profiles, HV battery configuration for 3-phase homes, and SunStone's monitoring platform for their service team. 100-unit initial order with 5yr warranty.

Results: 200+ homes powered off-grid in 12 months. Average system cost reduced by 28% vs previous supplier. Customer satisfaction score of 4.8/5.

The Partner: Established US outdoor equipment brand with REI, Cabela's, and Amazon distribution. Wanted to enter portable power category.

The Challenge: Required UL certification, US English branding and packaging, FCC compliance, and MOQ flexibility for initial market testing. Needed an OEM partner who could meet aggressive 6-week timeline.

Solution: SunStone's 1500Wh platform OEM'd with custom blue/orange branding, UL certification, FCC testing, and custom packaging. 300-unit initial order with 50/50 pre-season payment terms.

Results: 1,000+ units sold in first year across REI and Amazon channels. Follow-up order for 2,000 units with additional accessory SKUs. Brand now expanding to balcony ESS line.