How Much Power Do You Need for Off-Grid Backup?
Published Januart 12, 2026How Much Power Do You Need for Off-Grid Backup?
Grid Doctor 3300 Power Calculator
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:sans-serif;background:#f8fafc;padding:20px}
.calculator{max-width:800px;margin:0 auto;background:#fff;border-radius:12px;box-shadow:0 10px 40px rgba(0,0,0,0.1);overflow:hidden}
.header{background:linear-gradient(135deg,#002244,#003366);color:#fff;padding:32px 24px;text-align:center}
.header h1{font-size:1.8rem;margin-bottom:8px}
.header p{font-size:0.95rem;opacity:0.9}
.content{padding:24px}
.appliance-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin-bottom:24px}
.appliance-card{background:#f8fafc;border:2px solid #e2e8f0;border-radius:8px;padding:16px;text-align:center;cursor:pointer;transition:all 0.2s}
.appliance-card:hover{border-color:#c40727;transform:translateY(-2px);box-shadow:0 4px 12px rgba(196,7,39,0.15)}
.appliance-card.selected{border-color:#c40727;background:#fee2e2}
.appliance-icon{font-size:2.5rem;margin-bottom:8px}
.appliance-name{font-size:0.9rem;font-weight:700;color:#002244;margin-bottom:4px}
.appliance-power{font-size:0.75rem;color:#64748b}
.quantity-control{display:flex;align-items:center;justify-content:center;gap:8px;margin-top:8px}
.qty-btn{width:28px;height:28px;border:none;background:#002244;color:#fff;border-radius:4px;cursor:pointer;font-size:1.2rem;font-weight:700}
.qty-btn:hover{background:#c40727}
.qty-display{width:40px;text-align:center;font-weight:700;color:#002244}
.results{background:linear-gradient(135deg,#002244,#003366);color:#fff;padding:24px;border-radius:8px;margin-bottom:24px}
.results-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px}
.result-item{text-align:center}
.result-label{font-size:0.85rem;opacity:0.9;margin-bottom:4px}
.result-value{font-size:2rem;font-weight:900;color:#FFD200}
.result-unit{font-size:0.9rem;opacity:0.9}
.runtime-bar{background:rgba(255,255,255,0.2);height:12px;border-radius:6px;overflow:hidden;margin-top:8px}
.runtime-fill{height:100%;background:#22c55e;border-radius:6px;transition:width 0.5s}
.recommendation{background:#dcfce7;border-left:4px
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