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Battery Storage Knowledge Bank

TPPL Lead Acid: Northstar

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Lead acid vs Lithium Ion, Aqueous Hybrid

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 batteries

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.

Northstar TPPL Blue 200Ah Specificationlead_acid.jpg

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:

  • Partial state of charge cycling technology.
  • High cycling and fast recharge performance.
  • Operating temperature range: -40C to 65C.
  • Advanced 3 stage terminal design to ensure leak-free operation.

The specification of the 200Ah battery in particular is as follows:

Voltage  12 V
Capacity 200 Ah
Energy 2.4 kWh, usable capacity 1.2 kWh at 50% DOD
Dimensions (width x height x depth) 126 x 328 x 560 mm
Weight 69 kg
Lifecycles 2500 at 40% DOD
Warranty 12 months