Off-Grid Energy New Zealand uses a range of battery technologies from leading Australian and International suppliers – that are designed specially for home battery storage applications. The right battery technology for you will depend on your situations and requirements. Batteries must be carefully sized and cared for to ensure a long system life and worthwhile investment.
Scroll down for information on lithium-ion, sealed gel, and flooded lead acid battery technologies.
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Lithium-ion has a number of advantages for hybrid storage applications in particular. The highest quality lithium-ion batteries need to be used to ensure absolute safety and reliability. These batteries have a higher energy density (lighter & smaller than lead acid batteries), and have the ability to regularly deeply discharge. Reputable lithium-ion batteries would be expected to last +15 years provided they have a good battery management system and remain at a good temperature. The batteries are relatively new to large stationary applications (such as home storage) and no applicable Australian Standards have been developed yet. Their high cost and low autonomy (the ‘fat’ needed at times of low energy input or increased demand) means that they are still not ideal for off-grid applications.
A proven battery chemistry in off grid storage applications, VRLA battery banks are sealed and maintenance-free, have superior charge current handling, lower installation cost, and high recharge efficiency. Using a reputable brand, correct sizing, suitable housing, and appropriate battery management, VRLA battery banks have shown to last 15-20 years. The high autonomy (back up storage needed at times of low energy input or increased demand) of the VRLA batteries still makes them the ideal solution for off-grid applications.
Flooded Lead Acid Batteries are a lower initial cost proven performer in standalone applications that are properly sized and regularly maintained by experienced persons. Wet cells need regular maintenance in the form of checking the electrolyte level, adding distilled water to prevent drying out, regular cell top surface cleaning, and regular boost charging to overcome acid stratification. Under Australian regulations wet-cells must also be segregated from all other equipment, requiring their own storage enclosure to meet strict safety guidelines.