Battery Storage Solutions for Off-Grid

Product Details

As with most forms of technology, one size does not fit all and in the case of a battery system, location and most importantly the rate of expected discharge are the most important factors to consider when selecting the best battery for your off-grid installation.

There are typically three main types of battery that are used on renewable energy off-grid systems – Lead Acid Battery, Lithium Ion Battery and Salt Water Battery.

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For those who are entirely off-grid, Kingspan offers the following types of battery as a part of our complete off-grid system:

Lead acid battery

A key factor to consider with a Lead Acid Battery is the deeper the battery gets discharged on a daily basis, the less cycles it will achieve through its expected lifespan. How to eliminate this concern and ensure you are getting the maximum number of cycles and efficiency from the battery is to size the battery system so that your average daily demand never takes the discharge below 50%. Where you are using a Lead Acid Battery on a grid inverter system, the inverter will ensure the discharge rate is maintained not to drop below this threshold.

Lead Acid remains the most cost effective as the capital investment is considerably cheaper than an alternative battery.

Lithium Ion Battery

The main benefit to Lithium Ion Batteries is their ability to discharge up to 100% of the stated capacity which makes them a better option for those who have a high or fast energy usage and the battery are likely to be discharged quickly.
An additional benefit is they are very low maintenance compared to an alternative battery; however, the additional upfront capital cost is higher. A Lithium Ion battery is lighter with less space required for housing.

Salt Water Battery

A Salt Water Battery contains no heavy metals or toxic chemicals; they are also non-flammable and non-explosive, making them amongst the safest in the world. This type of battery is designed for stationary long-duration daily cycling applications such as off grid, micro-grid and domestic applications.

They are easily connected in series or parallel. Wide operating temperature range and a high cycle life are two of the main benefits of this type of battery.

A battery has two main specifications: voltage and capacity.
Multiplying these two values will calculate the watt-hours of energy storage.

Adding cells in series will allow you to build up to 12, 24, 48, 120 or any voltage.

Capacity is measured in Amp hours (Ah).
A string of 800Ah cells makes a 800Ah battery.
More amp hours can be gained by connecting more strings in parallel.


Kingspan can help you specify the right battery for your application. Our system designer will apply all the basic principles when designing your off-grid system.

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