Below are two main types of hybrid or off-grid inverters, available in various sizes with different continuous and peak power ratings, measured in kW or kVA.
Off-grid battery inverter-chargers with heavy-duty transformers are more expensive but provide high surge and peak power output and can handle high inductive loads. Many of these inverters-chargers are also grid-interactive, as explained in more detail below.
Hybrid inverters and AC-coupled battery systems use transformer-less inverters with 'switching transistors'. These compact lightweight inverters have lower surge and peak power output ratings but are more cost-effective, being cheaper and easier to manufacture.
Most battery inverters (hybrid or Inverter-charger) are available in a wide range of sizes determined by the continuous output power rating measured in kW or kVA
The inverter should be matched (sized) slightly higher than the load or power demand of the appliances it will be powering. Due to temperature de-rating in hot environments, the inverter should be at least 1.2 times larger than the highest continuous summer demand. Depending on the application, this is often the most important specification to be considered when selecting a hybrid inverter, especially when using a hybrid inverter as a backup power source for dedicated or essential loads. Whether the loads are inductive or resistive is also very important and must be taken into account.
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