Grid Tie Inverter MPPT range: 30V – 39V. If the DC connection is loose and causes a short circuit, then smoke may be emitted. The inverter adopts aluminum alloy casing, so there is no fire. Solar Grid Tie Inverter – Vmp(of a solar panel) must be in the MPPT range to ensure the good output efficiency Grid Tie Solar Inverter – Creative MPPT tech makes efficiency higher than 99%. Reaction more sensitive and MPPT locking faster Stackable Grid Tie Inverter – Parallel modular components design (Stackable use) is convenient for systems setting, flexible combination and system scalability. Please note: Do not use it together with a bidirectional meter in the local power grid. This is because the excess power from the inverter will be fed back into the grid, resulting in increased electricity costs. For a bidirectional power grid, we recommend using our SUN-Inverter series.