Getting the right batteries to fit your needs

Sizing your battery bank

An essential part of any renewable energy system is the ability to store energy produced for future use.  This is were your battery bank comes into play. Sizing a battery system to match your renewable energy system is dependent on three main factors, the size of your system, how much you intend to store for future use and how many hours needs to be covered. Once we have this information we can design a battery bank that is tailor fit to your needs. You may also use the calculator on this page to help in determining the number and size batteries you will need. Use the calculator below to see what size battery bank you will need. The number of batteries within the bank will depend on power rating (capacity for each battery).

Convert Watt hours to mAh
Insert Watts-hour (Wh) and voltage (V) and click on Calculate to obtain milliamp-hours (mAh).
Formula is (Wh)*1000/(V) =(mAh). For example, if you have a 1.5Wh battery rated at 5V, the power is 1.5Wh * 1000 / 5V = 300mAh.

What to know when buying batteries

Understanding battery terms

We have given in the above section a number of terms which will have anyone thinking, 'what does this mean?' Well we have you covered, here is a brief explanation of terms relating to battery and battery use: 

1. Cycle Life:  The cycle life of a battery is the number of complete charge/discharge cycles that the battery is able to support before it's capacity falls under 80% of it's original capacity. Batteries exhibit human-like qualities and need good nutrition, rest and care. Care begins by operating at room temperate and discharging them at a moderate current.

2.Deep Cycle: These batteries are designed to be regularly used and discharging most (70-80%) of its capacity.

3.Depth of discharge: Depth of Discharge, is used to describe how deeply the battery is discharged. This will vary depending on the type of battery; for the lowest rated performing battery you may be able to pull 30-40% of stored energy from the battery, without causing any damage, especially if they are being used regularly. On other batteries you may be able to go all the way to 100% discharge; this can be broken down further with regards to the number of times you can fully discharge your battery. For some batteries you can complete this on a regular basis, with no great adverse effect, others, only occasionally if there be an emergency.

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