Battery Sizing

Make sure you have correctly sized your battery by reading our How to size batteries

Battery Capacity

Having sized your battery now is the corerct time to check that your battery capacity is correct. Read our "what is battery capacity" information document.

Get The Facts

If you're new to batteries and want to learn more before making a decision to buy then read our Battery Facts information document.

Get More From Your Batteries

Knowing how your battery is performing will help you immensely. 

The best way to do this is to use a Battery Monitor

Trust us, there really is no better way to understand what is going on.

Choosing your batteries

Grid-connected battery systems generally use low-capacity banks made from sealed, batteries that will meet your needs for running critical loads durinig a power cut. These batteries are designed to stay in "float" most of the time with occassional heavier cycling.

 Load Profiling

If you require a battery bank for a grid connected solar PV system, you should bear in mnd that most power cuts happen only for a few hours or even a day, but rarely longer.  Size your battery bank for one day capacity and discharged to 50%.

Off-grid living requires a long-life battery system with greater "autonomy", the number of days that the battery will supply power for the loads before reaching 50% depth of discharge.  Most off-grid systems can operate well on 2-4 days autonomy with critical loads requiring longer periods.

Check this out

Off-Grid Energy Systems designed and supplied

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Deep Cycle Batteries for Solar Power Systems


Batteries for off-grid, remote power and backup power systems 


Choosing the right battery for your needs can be daunting.  Batteries are the key components in many applications and are very widely used in solar, wind or hyrdo power systems. The stored energy can be used to run household appliances at night or during the day and can be discharged rapidly to provide more power than the charging source itself can provide, so pumps or motors can be run from time to time.

The most commonly used types of battery are: Flooded Lead-Acid; Valve-regulated Lead-Acid batteries (known as VRLA, or sealed batteries) with two main types: Absorbed Glass Mat (AGM) batteries and GEL batteries.  Finally, Lithium Ion Batteries with a battery management system.


ROLLS BATTERIES Rolls Batteries for Solar Power and Off Grid Energy Systems. Rolls batteries offer a superb and wide range of  range of AGM , GEL and Lead Acid batteries, including the very wonderful 4000 series and 5000 series for off-grid energy systems.
More detail.
VICTRON BATTERIES Victron Batteries.  GEL and AGM Batteries. Superb Deep Cycle Batteries for Solar Power Systems and more... Victron batteries offer high quality at an amazingly good price.  Best sellers include: AGM batteries; GEL batteries; Lithium Ion batteries and OPZ batteries.
More detail.
MASTERVOLT BATTERIES Mastervolt AGM and GEL Batteries for Renewable Energy Systems Mastervolt batteries are available as AGM and GEL Batteries. High Performance and High Quality.
More detail.
LITHIUM ION BATTERIES  Lithium Ion batteries offer long life, superb performance, stable output and quick re-charge times.  An advanced Battery Management System (BMS) controls the charging, discharing and energy transfer.  The BMS offers safe and secure control over all aspects of the battery system.
More detail.
OPZ BATTERIES OPZ Long Life Lead Acid battery OPZ batteries are long life flooded tubular plate batteries.  They are low maintenance under normal operating conditions.  Supplied dry-charged or ready for use electrolyte filled.
More detail.

Sonnenschein batteries are available in a wide range of Ah and Voltages.  Choose from 4V , 6V or 12V cells.

Batteries require proper maintenance and can fail prematurely if not well looked after.  Deciding on the "best" battery for your requirements requires careful consideration.  The most important aspect of buying any battery is DEPTH OF CHARGING CYCLE.

There are two main types of battery: SHALLOW CYCLE BATTERY and DEEP CYCLE BATTERY

What is the difference between the two battery types?


SHALLOW CYCLE BATTERIES are typically car batteries. These batteries are designed to provide a very high current for a short period of time; such as starting your car.  However, they cannot withstand repeated deep discharging - below 20% - and therefore are not suitable for use with solar PV systems.

DEEP CYCLE BATTERIES are designed to be repeatedly charged and discharged by as much as 80%. Having said that, if these batteries are shallow cycled - not discharged below 50% of capacity - then they will have an even longer life. 

A typical Lead Acid battery contains liquid acid in cells that are sealed.  AGM and GEL batteries are known as SEALED Lead Acid batteries. Thus, both AGM and GEL batteries are better known as "maintenance free" batteries. The size of a battery bank is determined by the storage capacity required. Battery capacity is determined by the amount of electrical energy the battery can deliver over a certain period of time and is measured in Ampere hours (Ah) when discharged at a uniform rate over a given period of time.

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