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The power of off grid inverter shall be confirmed according to the user's load type and power.
The component power shall be confirmed according to the user's daily power consumption.
The battery capacity is determined according to the power consumption of the user when there is no sun, because photovoltaic power generation can be used directly to the load without power storage during the day.

XNPIII series when use more than three unit supporting parallel into three-phase 380VAC output. And support unbalanced configuration, such as one of phase has 15kw capacity, the other two phases are 5kw.

XNPIII series inverter have parallel function.Support max 9 unit parallel.（Need purchase parallel kit）

Yes,IP54 can be customized for PCS and lithium battery cabinet.

For example, a lithium battery that has been used for one year and a brand new lithium battery are mixed on the same PCS machine.

No, due to the characteristics of lithium batteries, different batches of lithium batteries have different battery capacity and internal resistance, and the consistency is very different. Using them together will cause voltage imbalance and current uncontrollable problems.In severe cases, it will cause safety accidents such as fire or explosion of the lithium battery, so it cannot be mixed.

Yes, but the direct motor drive will have a large starting current, which can only drive a certain power motor load. For details, please contact INVT.

It is mostly caused by improper design, unreasonable string matching, and wrong parameter setting (safety regulations, MPPT working mode), etc

Possible causes and solutions:
1. Block the PV panels from buildings, trees, poles, wires, front row components, etc. ——Investigating the site, fully consider the surrounding shielding factors, remove the removable obstructions, and optimize the series parallel connection mode;
2. Cover the PV panels with fallen leaves, bird droppings, dust, dirt, plastic bags, etc. ——Clean up the PV panels in time
3. Different types and specifications of PV panels is mixed; ——The same type PV panels should be connected into one or more groups, and multiple groups should be placed under the same MPPT;
4. The power distribution of the series is unreasonable, the power is mainly concentrated on one of the MPPT channel; —— The power is evenly distributed to the two MPPT channels;
5. The inverter safety regulations are set incorrectly, or the MPPT working mode is set incorrectly; —— set the safety regulations correctly, and select the corresponding MPPT working mode according to the front-end series connection mode (the parallel mode is rarely used, please consult our technical personnel for details)
6. The diameter of the cable used from the inverter to the parallel network point is too small and the distance is too long. The cable material is aluminum core wire, which makes the line loss larger; ——Choose the cable with larger wire diameter, select copper core cables, and reasonably plan the wiring path.

The main inverter  fault codes are A003 AC undervoltage, E011 relay fault, three-phase voltage imbalance, self check not grid connected, burning connector, terminal block and switch

Possible causes:
1. The wiring screws of all protective appliances are not tightened, the crimping length of wire ends is not enough or pressed to the insulation layer, and the screw holes are ignited and ablated;
2. The wire cores connected to the connector are uneven, the core is not compressed, the crimping length of the core is not enough, the connector pin is pulled out, the exposed part is too long, L, N and PE wire are connected in wrong hole;
3. The screw of terminal block is not locked tightly;
4. The ground wire is suspended and the ground wire is overlapped at will;
5. The wire diameter is too small and the cable is burnt out;

Solutions:
1. Strengthen the training of electrical technology ability and standardize the electrical installation and wiring;
2. Strengthen the professional training of installation and construction personnel, and correctly handle the wire ends and crimping ends;
3. Reasonable wiring and reasonable selection of wire diameter;

In the process of placing orders, INVT will give customer a detailed list of spare parts, which will mark whether the spare parts are compatible with different models of VFDs; If the customer still has the previously ordered machine on site, it is necessary to confirm with INVT engineer whether it is compatible.