Maximum efficiency
Inverter efficiency for solar panels.
The efficiency indicator is the percentage ratio between the amount of energy that the device delivers to the load and the energy consumed from the solar panel. The higher this parameter, the more efficient the operation of the device and the lower the losses during conversion. In modern inverters for solar panels, efficiency values of up to 90% are considered average, and above 90% are considered good.
Euro efficiency
The European inverter efficiency is measured based on several load values (e.g. 10%, 30%, 50%, 100%), which better reflects the actual operating conditions of the device. Indeed, in fact, inverters rarely operate at full power in constant mode. To calculate the Euro index, the weighted average of the inverter efficiency at different load levels is taken into account. Note that there is no single generally accepted formula here - it may vary depending on the specific standard or equipment manufacturer. Nevertheless, Euro efficiency allows you to more accurately assess the efficiency of the inverter under conditions of partial and full power use
Peak power
The highest total output power in watts (W) that the inverter can deliver to a load for a relatively short period of time, on the order of 2 to 3 seconds. As a rule, this power is 30 - 50% more than the rated power (see above). The peak load value can be useful when calculating how the inverter works together with appliances that consume a lot of energy at start-up (vacuum cleaners, borehole pumps, power tools, etc.). The rule here is simple - the peak power of the inverter must not be lower than the starting power of the load.
Rated AC current
The current strength that the device is capable of stably and safely delivering when operating in rated mode (i.e. for the longest possible time without the risk of overloads and failures). The indicator is expressed in Amperes (A).
Maximum AC power
The maximum current in amperes (A) that the inverter, when operating, is capable of outputting without overloads or failures.
Connection voltage
The efficiency of the solar system, laid down by the manufacturer of the inverter, directly depends on this parameter. The following battery voltage options are most widely used:
12 V,
24 V and
48 V.Maximum charge current
The maximum amount of direct current in amperes that the inverter can convert. If the solar panel produces a current exceeding this value, the inverter simply does not use it. This is often justified when connecting an inverter to high-power solar panels - the maximum input current of the inverter is reduced to acceptable values so that moderate-sized wires can be used to transmit energy.
Total battery capacity
The total capacity of the batteries connected to the inverter, expressed in ampere-hours (Ah). The larger the capacity, the longer the battery life will be, all other things being equal. For example, a 100Ah battery can theoretically deliver 100A for one hour, or 10A for 10 hours.
Separately, we note that batteries with the same rated voltage can be compared by capacity in ampere-hours - this is due to the characteristics of the ampere-hour as a unit of capacity. If you need to compare batteries of different capacities, you need to use data in watt hours (see below). And using special formulas you can calculate the capacity in Wh based on the capacity in Ah and the rated voltage of the battery.
Total battery capacity
The total capacity of the connected batteries in watt-hours (Wh). In fact, this is the amount of energy that is supposed to be stored in the battery. The larger the capacity, the longer the battery life of the connected equipment will be, all other things being equal. On the other hand, this parameter also affects the dimensions, weight and price of the battery. Based on the capacity in watt-hours, batteries can be compared with each other.
