What is the difference between
On-Grid and Off-Grid systems?
An On-Grid solar system is usually found in Houses or Business premises. It connects the power generated from the PV panels to the Mains Power
and National Grid. It is possible to be paid for this energy you generate by
your power supplier.
An Off-Grid solar system uses the power generated to charge a
battery bank. The power stored can then be used to power devices in a house,
shed or remote building. Thea systems can be as small or as large as you wish.
From a light in a shed to a whole house.
What is required for an On-Grid
system?
An On-Grid system consists of: Solar panels and mounting system,
Grid tie invert er wire / cabling, safety breakers, and monitor.
What is required for an Off-Grid system?
An Off-Grid system consists of: Solar panels and mounting system,
charge controller and battery bank. Options include: AC Invert er DC breaker
(dependent on PV size). With off-grid systems it is always recommended to use
the most efficient appliances and devices to save on panel size. Panels and
watts are usually more expensive than buying new high efficiency devices.
What is a charge controller?
Simply, a charge controller protects the battery and solar panels
from damage. A charge controller takes the power from the solar panels and
modifies it so that the battery is not damaged. A 12v solar panel can produce up-to 21v at times, this can damage the battery and any circuits that run off
the battery. The controller makes the charging voltage and current safe for the
battery and circuits. When the battery is full the charge controller cuts off
the charging to the battery to protect it from over charge and damage. This
also extends the battery life. There are 2 main types of controller. The basic
PWM (pulse width modulation) and MPPT (maximum power point tracking). PWM is
more efficient than the very simple ON-OFF chargers that are outdated and we do
not sell. PWM maintains the best from the batteries and is a strong effective
method. MPPT controllers are far more expensive but also they control the
panels output power with advanced technology and algorithmic These MPPT
controllers are up to 25% more efficient than PWM.
What is an invert-er?
The invert-er is an electronic device that changes DC (direct
current) in to AC (alternating current).AC power is commonly used in cars,
vehicles and battery powered portable devices like television remote controls
etc. AC is the power type that comes from your household power socket. DC to AC
inverters are inefficient and waste up to 30% of the power you generate. It is
almost always better to use high efficiency 12vdc devices where ever possible.
