Sut Ap cho He Luu Tru Bang Pin: Cap DC, Feeder Inverter va Tu Backup
He thong pin luu tru de lo lua chon day dan theo thoi quen rat nhanh. Mot feeder co the dat ve ampacity nhung van lay mat bien do dien ap cua inverter backup. Ngay ca cap DC ngan cung co the mat nang luong dang ke khi dong xa len den hang tram ampe.
Trong thuc te, can kiem tra toan bo duong di: duong DC giua pin va inverter, duong AC giua inverter va tu tai trong yeu, va bat ky feeder nao giua thiet bi nguon va tu backup. Voi NEC, cac diem huu ich la Article 706, khi co nguon lien ket thi them Article 705, va cac ghi chu thong tin 210.19(A)(1), 215.2(A)(1). Voi du an IEC, IEC 60364-5-52 va IEC 60364-8-2 la tham chieu thuc dung. NEC IEC
Vi Sao He Thong Pin Can Kiem Tra Sut Ap Rieng
Mach pin thuong co dien ap DC thap hon va dong cao hon, vi vay mot dien tro nho cung tao sut ap phan tram dang ke.
He thong co the co ve on khi sac nhung lai yeu khi xa sang tai du phong.
Inverter hybrid, tu tai trong yeu, thiet bi chuyen nguon va pin dat ngoai troi tao ra nhieu doan dan can xem cung luc.
Nguoi DIY thuong chi nhin aptomat va dung luong pin, trong khi thau dien va ky su con phai bao ve hieu nang inverter va mo rong sau nay.
Cac Diem Code va Tieu Chuan Nen Ghi Len Ban Ve
- NEC Article 706: ESS can bo tri ngat ket noi, chon day dan, bao ve qua dong va cach lap dat phu hop.
- NEC Article 705: neu he thong pin lam viec cung nguon tai cho hoac thiet bi lien ket, feeder va cach dau noi phai duoc phoi hop.
- NEC 210.19(A)(1) va 215.2(A)(1): nhieu nguoi thiet ke van dat muc khoang 3% tren tung doan va 5% tong.
- IEC 60364-5-52 va IEC 60364-8-2: xac nhan phuong phap lap dat, he so gom nhom, dieu kien moi truong va ky vong van hanh cua he prosumer truoc khi chot tiet dien.
Cac Truong Hop Lap Ke Hoach Pho Bien cho He Pin
Day la gia tri de lap ke hoach, khong thay the huong dan nha san xuat hoac bang tieu chuan cuoi cung. Chung cho thay sut ap tro thanh yeu to chi phoi som the nao trong cong trinh pin.
| Tinh huong | Khoang cach va tai | Day dan | Sut ap xap xi |
|---|---|---|---|
| Pin 48V den inverter | 2 m mot chieu, 200A DC | 50 mm2 Cu | khoang 0.31V / 0.65% |
| Pin 48V den inverter | 5 m mot chieu, 150A DC | 35 mm2 Cu | khoang 0.79V / 1.64% |
| Inverter 240V den tu backup | 110 ft / 34 m mot chieu, 40A AC | 6 AWG Cu | khoang 4.3V / 1.8% |
| Inverter hybrid 230V den tai | 35 m mot chieu, 32A AC | 10 mm2 Cu | khoang 4.1V / 1.8% |
Vi Du Co So Cu The
Bo pin 48V, xa 200A, cap DC dai 2 m
Voi 50 mm2 dong o muc khoang 0.387 ohm/km, sut ap hai chieu vao khoang 0.31V. Nghe co ve nho, nhung tren he 48V no da la khoang 0.65%. Neu chon day nho hon, inverter mat bien do ngay lap tuc.
Inverter pin den tu tai trong yeu 240V, 40A, 110 ft
Dung 6 AWG dong khoang 0.491 ohm/1000 ft thi sut ap feeder vao khoang 4.3V, hay 1.8% o 240V. Thuong la dung duoc, nhung neu feeder phia truoc da an mat mot phan muc tieu 5% thi 4 AWG se sach hon.
Inverter hybrid 1 pha 230V, 32A, lo trinh IEC 35 m
Voi 10 mm2 dong khoang 1.83 ohm/km, sut ap khoang 4.1V, tuc 1.8% o 230V. Lua chon 6 mm2 len gan 6.9V, hay 3.0%, de lai it du dia hon cho tai backup.
Danh Sach Kiem Tra Truoc Khi Chot Tiet Dien
- Kiem tra che do xau nhat: sac, xa, ho tro dinh hoac cong suat lien tuc toi da cua inverter.
- Do chieu dai mot chieu thuc te cua tung doan thay vi gia dinh pin va inverter “du gan”.
- Dat gioi han cap cua nha san xuat, dinh muc coc dau noi, khong gian uon va yeu cau cat DC tren cung mot bang tinh voi sut ap.
- Kiem tra ca duong DC va AC, vi cap pin manh khong cuu duoc feeder backup yeu.
- Neu sau nay co the bo sung module, tang cong suat inverter hoac mo rong tu tai trong yeu, hay de san bien do ngay tu bay gio.
Tinh Toan He Pin Truoc Khi Keo Cap
Nhap dien ap he thong, dong dien, vat lieu day, kich thuoc du kien, pha va chieu dai mot chieu de so sanh duong DC cua pin va feeder AC backup.
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