In general we recommend Lithium Ion or Aquion salt water batteries wherever possible as lead acid batteries tend to have a short life and issues with partial charging. See our Battery Page for a full comparison of the various battery types.
There is however one exception to this and that it is the new Northstar TPPL – thin plate pure lead – batteries. This is a Partial State of Charge (PSOC) battery, and is fine with partial charging.
PSOC stands for Partial State of Charge. Most standard lead acid batteries are not PSOC capable and require full recharge after each discharge to achieve a long life. This is not always possible in a solar application, without grid draw-down. A PSOC battery does not require a full recharge every cycle. As a result the batteries have a much longer life, particularly in solar applications.
The Northstar TPPL Blue battery has 2500 life cycles at 40% depth of discharge (lead acid batteries are usually sized on the assumption of a 40-50% depth of discharge) and a 6+ year life, and a fast charge / discharge rate.
The batteries are manufactured by the multi-billion dollar US battery manufacturer, Northstar.
Realistically for most solar applications, they should last around 8 years.
There are various sizes of the battery, as shown in the downloadable specification. We generally specify the new 12V, 200Ah NSB-210FT-Blue+ (not shown on attached specification).
Key parameters for the batteries are as follows:
The specification of the 200Ah battery in particular is as follows:
|Energy||2.4 kWh, usable capacity 1.2 kWh at 50% DOD|
|Dimensions (width x height x depth)||126 x 328 x 560 mm|
|Lifecycles||2500 at 40% DOD|