500 watt solar panel kits for off-grid application (DIY).

A 500-watt solar panel kit with the right inverter and battery bank can make a pretty nice off-grid solar system. Solar power systems are still quite expensive when you compare them with grid-supplied power. In my opinion, though, they are cheaper than generators for off-grid (cottage or RV) applications. And they are getting more affordable every day.

There is a lot of joy in being completely disconnected from the grid. However, for that, you will need a bigger system. To be completely off-grid, I suggest you start with a 1000 watt solar panel kit and system.

In this article, I hope to show you what a 500 Watt solar panel array can do, show you how to create a 500-watt solar panel system, and list out the best 500-watt solar panel kits you can find online. Please note that I will be focusing mostly on the solar panel kits and not the complete systems.

A sample 500 watt solar panel kit setup for RV, Cabin or farm

Why 500 watt solar panel?

You do not need a 500-watt solar panel kit to start your journey off-grid. But you will be off to an excellent start if you start from here. 

I started my journey with a 40-watt solar panel, then I went for a 300-watt solar panel system and then a 1000 watt solar panel system. A solar panel kit like this will provide a lot of power to recharge your batteries during the day fast enough to use it again at night.

That being said, it is not hard to find a 500W solar panel kit these days. This is because the 100-watt solar panels are no longer the most popular single panels. There are now single panels that range anywhere from 150 watts to 400 watts.

This means that kits are more efficient at 400 watts, 600 watts, 800 watts, 1000 watts, 2000 watts, and so on.

So to form a 500W solar panel kit, you would most likely choose five 100 watt solar panels or two – 250 watt solar panels. It is better to go for the 250 W or higher wattage panels because it leaves room for expansion.

If you already have a system with some 100-watt panels, you can expand with a 500-watt kit. Or if you have lots of space, you can also go with a 500-watt kit made up of 100-watt panels.

What can a 500 watt solar panel kit do?

A 500-watt solar panel kit can either be connected to a 12V or 24V system. The downside of a 12-volt approach is that you will be drawing more current from your batteries, and as such, you will lose more power to the heating of your battery cables.

A 500 watt solar panel system does not mean that all you can power in your house or cabin is 500 watts. The 500 watt rating only refers to the amount of power that will be returned to your battery bank from the sunlight.

A 500-watt solar panel system will deliver 500 watts to your batteries every hour that the sun is directly over the panels. We all know that the sun will not always be overhead. So depending on your location and time of the year, you may get an average of 5 – 12 hours of sunlight daily.

This means that your 500-watt solar panel kit can theoretically deliver 2500watt to 6,000 watts of power to your battery bank. In practice, however, you may estimate for 50-70% of that. This is because the sun is only directly over your panels for about 1 hour of the day. At other times it is at an angle, and your panels will not deliver the full 500 watts.

How to connect a 500 watt solar panel kit to form a system.

A Simple System


These are not the exact components used in the video. These are the components you will need to build yours.

Cables and woodwork will cost extra, but you can work with these and get a good estimate.

Solar panel system Connection with a combiner

If your budget allows it, you can go for a 1000 watt system, but if not, all you need to do is replace this system with a 500-watt solar panel array, and you can still power the same amount of equipment during the day but for less time. You may also need to turn things down, so you have some juice in your battery at night.

If you are going for a 500-watt solar panel system, I can guess that you don’t intend to go completely off-grid, or you would not be powering so many things. Whatever the case, a 500-watt solar panel array can charge your batteries and run at least 300 – 400 watt of devices all day without affecting your fully charged batteries.

Components needed to build a similar System. This is if you want to build your own solar power kit.

This system runs a 6000 BTU window air conditioner, washing machine and other electronics for 10hrs daily.

Build your own 500 Watt Solar Panel system.

Here is a sample cost for a robust 500-watt solar panel setup. It is more than 500 watts (1,280W), and you can always change the pieces as you desire.

Photo Title Buy
OutBack Power FM60-150VDC...image OutBack Power FM60-150VDC FLEXMax 60 Charge Controller Check Price
ExpertPower 24V 100Ah...image ExpertPower 24V 100Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery | 2500-7000 Life Cycles & 10-Year lifetime | Built-in BMS | Trolling Motor, RV, Solar, Marine, Overland, Off-Grid Check Price
Kinverch 2000W Continuous/...image Kinverch 2000W Continuous/ 4000W Peak Power Inverter 3 AC Outlets 12V to 110V Car Converter with USB Port and Bluetooth APP Remote Control Check Price
24V Pure Sine...image 24V Pure Sine Wave Power Inverter 3000Watt DC 24V to AC120V with Dual AC Outlets with Remote Control 2.4A USB and LED Display Check Price
Renogy 2Pcs 270...image Renogy 2Pcs 270 Watt 24 Volt Solar Panel 540W for Off-Grid On-Grid Large Solar System, Residential Commercial House Cabin Sheds Rooftop, Multi-Panel Solar Arrays Check Price

Some 500 watt solar panel kits plus (500W – 800W)

ACOPOWER 500 Watt solar panel kit

Eco-worth 600 watt Solar panel kit

ECO-WORTHY 600W Solar Panel Kit Complete Solar Power System with Battery and Inverter for Home House...
  • Package Includes: Solar Panels + Charge Controller + Battery + Inverter + Z Mounting Brackets + Connectors + Solar Cable

Eco-worthy 800 Watt solar panel kit

ECO-WORTHY 800 Watts Complete Solar Power System Kit Off Grid with battery: 4pcs 195W Mono Solar...
  • Max Daily Output up to 3.2KWH in ideal situation, ideal for RV/Shed/Home use

Eco-Worthy 800 Watt Solar Panel kit plus battery and inverter

ECO-WORTHY 800 Watts Solar Panel Kit with Battery and Inverter Off Grid Solar Power Kit for Home,...
  • Max Daily Output up to 3.2KWH in ideal situation,ideal for RV/Shed/Home use

Other Complete Solar Panel Kits

Photo Title Buy
ECO-WORTHY 800W 24V...image ECO-WORTHY 800W 24V Solar Panel Off Grid System Kit with Battery: 8pcs 100W Mono Solar Panel + 1500W 24V-110V Inverter + 200Ah Battery + 60A PWM Charge Controller for RV, Boats, Homes Check Price
ECO-WORTHY 800 Watts...image ECO-WORTHY 800 Watts Solar Panel Off Grid RV Boat Kit: 8pcs 100W Solar Panels + 60A PWM Charger Controller + 16Ft Solar Cable + Z Mounting Brackets Check Price
ECO-WORTHY 1KW Complete...image ECO-WORTHY 1KW Complete Solar Panel System Kit with Battery and Inverter for Homes House Shed Farm Check Price
XINPUGUANG 100w Flexible...image XINPUGUANG 100w Flexible Solar Panels 24V 1000W Solar System Kit Monocrystalline Cell Module 45A Controller 2000W Inverter for Off Grid Battery Charger for Cabin RV Boat Trailer Check Price
ECO-WORTHY 2300W Off...image ECO-WORTHY 2300W Off Grid Solar Panel Kit 24V Complete Solar System with 12pcs 195W Solar Panel and 3000W Inverter and 6 String Combiner Box and 60A Controller and 4pcs 100AH Battery Check Price
ECO-Worthy 3900W 15KWH/Day...image ECO-Worthy 3900W 15KWH/Day Grid Tie Complete Solar Panel System Kit: 20pcs 195W Solar Panel + 5KW Grid Tie Inverter + Solar Cable Check Price

What to add to your Kit to make your system

In addition to the solar panels, you will need…

  • a power inverter
  • a battery bank
  • racks to arrange your batteries
  • fuses
  • extra cables.

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