Batteries and inverters
Everything you need to know
Batteries And Inverters
Lead-acid batteries are often used in renewable energy systems.
However, lithium batteries, though
more expensive than lead-acid, are becoming more affordable and can have a much longer life.
Nickel iron batteries are harder to find and less efficient than lead-acid or lithium ion but
have very long lives.
Flow batteries (zinc bromine and vanadium redox) and flywheel batteries can be used in renewable energy systems but are complex and expensive.
Most batteries are composed of a number of cells. In stand-alone power systems, the
voltages commonly used are 12V, 24V, 48V or 120V.
Batteries can be supplied as a mono-block but usually come as individual 2V cells which are assembled into a complete battery on site. A 12V battery consists of six 2V cells, and so on. Battery banks should provide a number of days’ energy reserve — three to seven days is typical.
Standards relating to lead-acid batteries for stationary purposes include AS 2676-1992, Guide to the
installation, maintenance, testing and replacement of secondary batteries in buildings;
AS 3011-1992, Electrical installations — secondary batteries installed in buildings; AS 4029-1994, Stationary batteries — lead-acid; and AS 4086-1993, Secondary batteries for use with stand-alone power systems.
Ground panels vs. roof panels
Is there a maintenance difference?
The only real difference
between maintaining ground-mounted solar systems and roof solar systems is that ground panels
are easier to access, and therefore easier to keep clean.
If you notice a buildup of snow or other debris, you can simply sweep it off with a broom.