越南采购需求：光伏系统、太阳能系统、太阳能微型逆变器、太阳能逆变器、Sunpower太阳能电池板、透明太阳能电池板

I'm interested in your wholesale pricing for solar brackets. Could you please provide your best rates along with any volume discounts or pricing tiers you may offer? Additionally, I'd like to know about the materials used and the specifications of the brackets. If you have any catalog or product sheets, that would be great to review as well. Looking forward to your prompt response!