Off-Grid

Off-Grid Solar PV System is the one without the electricity power grid connection. It mostly comes with a power storage, i.e. a battery bank.

With different controllers or inverters, the system has different functionalities.

OFF-Grid‘s Charge Controllers

There are different type of the charge controllers:

PWM Controller:

• Pros: Low cost.
• Cons: Not good for a multiple-panels PV system.

MPPT Controller:

• Pros: PV output optimized, the less cost.
• Cons: More cost than PWM. Limitation with the input current/PV system size based on the models.

Off-Grid with inverter

There are different type of the inverters:

Square Wave or Modified Sine Wave Inverter:

• Pros: Low cost.
• Cons: Not efficient. Could be noisy.

Pure Sine Wave Inverter:

• Pros: Most efficient. Not necessarily the highest cost. Less audible noise.
• Cons: The front cost looks more than other types.

Off-Grid with Inverter / Charger

The Inverter/Charger, beside the DC to AC inversion, can also charge the battery through AC power.