600 watt Solar System | What Charge Controller, No. of batteries, Inverter size to Use?

A 600 watt solar system can be a convenient way to keep several appliances running in an RV, trailer, or even when you just need an emergency backup power solution for your home.

Depending on how many sunshine hours your location receives you can expect it to supply between 1,800 – 3,000 Wh of energy per day that can keep several low power appliances running for several hours.

If the system does not come in a kit form then you’ll need to figure out what size of solar charge controller, capacity and number of batteries, and inverter rating.

Sizing the components correctly helps to get your appliances to run for many hours without worrying about your system running out of power or your system failing prematurely.

So, read on for guidance on what size of the charge controller to use, how many batteries to connect, inverter size to use, and what appliances you can connect to a 600 watt solar system

What Size of Charge Controller for a 600 Watt Solar System?

You can use a 40A PWM or MMPT (preferably) controller for your 600 watt solar system or larger if you plan to scale the system ( 60A+). Confirm that it can handle the total voltage of the solar system before connecting.

Using a higher current rated charge controller though advantageous if you plan to increase the size of your system has the potential downside of not using the full capacity of your charge controller which costs higher if you have no plans to scale the solar system.

Portable Solar Panel
Portable Solar Panel

How Many Amps Does a 600 watt Solar System produce?

A 600 watt solar system generates a maximum of about 30 amps – this assumes 3 x 200 watt solar panels connected in parallel.

Related Posts: How many watts of solar can a 40A charge controller handle?

How Many Batteries to Use with a 600 Watt Solar System?

You can use a 150 Ah battery bank for this 24V system.

To achieve this, you can use 3 pcs of 200 Ah AGM or GEL batteries in parallel (12V) or 3 pcs of 100 Ah Lithium batteries (12V battery bank).

For a 24V battery system, you can use 6 pcs of 100 Ah AGM or GEL batteries (3 strings of 2 batteries in parallel) or 6 pcs of 50 Ah Lithium batteries (3 strings of 2 batteries in parallel).

This is based on an estimated daily energy production of 1.8 kWh (about 3 – 4 hours of sunshine) and assumes that your battery bank voltage is 12V.

Calculation

Battery capacity (Ah) = Average daily energy production (Ah) / (battery bank voltage x battery depth of discharge).

For a GEL or AGM, recommended depth of discharge is 50%, therefore battery capacity is 300Ah at 12V from1,800wh /(12V x 50%) and 150Ah at 24V.

Using smaller battery banks

If you use smaller battery capacities like a 50Ah, you underutilize the system because you are not able to store all of the electrical energy generated by the solar panels

Using larger battery banks

If you use considerably more batteries (larger battery capacity), there is a good chance that the generated power will not be enough to fully charge the drained batteries which affects their lifespan.

Related posts: How much energy does a 200 watt solar panel produce?

What Size of Inverter to Use with a 600 watt Solar System?

There is no hard and fast rule on the inverter size to use with solar systems as it largely depends on the combined capacity (w) of the appliances you plan to connect to.

That said it is common to find 600 watt solar system kits packaged with inverter sizes of capacities ranging from 1,000 – 3000 watts.

Smaller inverter sizes may be used but the size and number of appliances you can use with the available energy in the batteries is limited by their low maximum power handling capacity.

What Will a 600 Watt Solar System Run?

Some examples of common appliances that you can connect to a 600 watt solar system are shown in the table below.

Note: The list is not exhaustive and it is quite likely that there are appliances not on the list that can be used on a 600 watt solar system.

mini Fridge or freezer50 watt LED TV
Laptops or Desktop computerLED lighting
small pumpssmall power tools

How long the appliances run for depends on the state of charge of the battery, the battery capacity, and the total power consumption of connected appliances.

If the 600 watt solar panel system on a given day generates 1,800 Wh generated by the solar panels, you can comfortably run as an example:

  • Lights: 6pcs each 10w for 6 hours = 360 wh
  • Laptop: 40w laptop for 4 hours =160 wh
  • Fridge: 250W fridge for 4 hours =1,000 wh

Total 1,520 watt-hours which is within the available 1,800wh supplied by the solar panels and stored in the batteries.

Final Word

A 600 watt solar system typically generates between 1,800 – 3,000 Wh of energy daily depending on the amount of sunshine available.

To store the generated energy you can connect a 300 Ah battery bank to this system.

You can connect use 3 pcs of 200 Ah AGM or GEL batteries in parallel (12V) or 3 pcs of 100 Ah Lithium batteries (12V battery bank).

To control the charging process can use a 40A, 60 A, or higher current rated charge controller with the solar system if you plan to increase the size of the system.

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