How much power does a 300 watt solar panel produce?

Rico.chen

New Member
Joined
Nov 20, 2020
Messages
8
How much power does a 300 watt solar panel produce?

1. Design guide for 300W small off-grid solar system (12V battery system)​

A. 1*300W Mono/ Polycrystalline solar panel.
B. 1*30A Mppt solar charge controller.
C. 1*100AH 12V Gel or 1*50AH LiFePO4 battery.
D. 1*300W pure sine wave inverter.

How much power does a 300 watt solar panel produce?

With an average daily sunshine of 5 hours at full load, this system can generate approximately 1.5kWh, calculate the power generation of this solar panel according to the local sunshine situation. Without using the load, the 12V 100AH battery can be fully charged in about 4 hours. Assuming that our system is used for outdoor monitoring, usually a set of monitoring power is 20W, which also means that the power consumption for 24 hours is 0.48kWh. Because the inverter has a conversion efficiency, we calculate it at 88%, the 20W monitoring consumes about 0.55kWh per day. If you are in a place where there are 10 hours of daytime, this system will fully meet the daily monitoring work and even can support more than 48 hours in the absence of any sunlight. If you need a longer time or larger load, you can increase the battery capacity. And the cost of this system is very low, suitable for off-grid solar power system with only low-cost budgets.

see full

7 Best Design of Off-grid Solar System Guide 2021

 

anadiner

Solar Enthusiast
Joined
Aug 10, 2021
Messages
300
How much power does a 300 watt solar panel produce?

1. Design guide for 300W small off-grid solar system (12V battery system)​

A. 1*300W Mono/ Polycrystalline solar panel.
B. 1*30A Mppt solar charge controller.
C. 1*100AH 12V Gel or 1*50AH LiFePO4 battery.
D. 1*300W pure sine wave inverter.

How much power does a 300 watt solar panel produce?

With an average daily sunshine of 5 hours at full load, this system can generate approximately 1.5kWh, calculate the power generation of this solar panel according to the local sunshine situation. Without using the load, the 12V 100AH battery can be fully charged in about 4 hours. Assuming that our system is used for outdoor monitoring, usually a set of monitoring power is 20W, which also means that the power consumption for 24 hours is 0.48kWh. Because the inverter has a conversion efficiency, we calculate it at 88%, the 20W monitoring consumes about 0.55kWh per day. If you are in a place where there are 10 hours of daytime, this system will fully meet the daily monitoring work and even can support more than 48 hours in the absence of any sunlight. If you need a longer time or larger load, you can increase the battery capacity. And the cost of this system is very low, suitable for off-grid solar power system with only low-cost budgets.

see full

7 Best Design of Off-grid Solar System Guide 2021

Hum. Of course, u will need look at standard vs high efficiency... string inverters will be standard.

Not liking ur math cuz appears assuming perfect situation, as well as, 12v 100ah = 1200wh hours which will be 600wh if lead-acid.

I mean if load us extremely minimal where panel can maintain it during daylight and keep batt charged then maybe... once again continuous overnight load.

General safe rule is 300w per 100ah battery. This allots for efficiency variance.

Theres no such thing of getting max. Human error, weather, etc.

With all that said, 2 things:
1. Leave room to upgrade. Solar folk are constantly wanting to add. Dont box urself in. U could easily go 24v inverter using 2 12v batteries in series = increase ur wh. (But remember panels voltage must be higher than battery voltagr)
2. I dont like only 1 battery. Might as well consider a solar power station.

Good luck. Have fun. Suspect its gonna come up hair short but good place to start. Leave room to add.
 

anadiner

Solar Enthusiast
Joined
Aug 10, 2021
Messages
300
Shouldn't this corporate sales and market post be in the corporate section?
Good point. I took the bait but Im impossible to sell anything. LOL. Guess true DIY believer here.

Honestly curious if that small system would work for a small load off-grid cabin.

But shoot I picked up a 250w power station for $110 on Amazon. So this thing would have be like a starter thing for fun.
 

Rico.chen

New Member
Joined
Nov 20, 2020
Messages
8
Good point. I took the bait but Im impossible to sell anything. LOL. Guess true DIY believer here.

Honestly curious if that small system would work for a small load off-grid cabin.

But shoot I picked up a 250w power station for $110 on Amazon. So this thing would have be like a starter thing for fun.
Haha . you can try it.
 

Rico.chen

New Member
Joined
Nov 20, 2020
Messages
8
Hum. Of course, u will need look at standard vs high efficiency... string inverters will be standard.

Not liking ur math cuz appears assuming perfect situation, as well as, 12v 100ah = 1200wh hours which will be 600wh if lead-acid.

I mean if load us extremely minimal where panel can maintain it during daylight and keep batt charged then maybe... once again continuous overnight load.

General safe rule is 300w per 100ah battery. This allots for efficiency variance.

Theres no such thing of getting max. Human error, weather, etc.

With all that said, 2 things:
1. Leave room to upgrade. Solar folk are constantly wanting to add. Dont box urself in. U could easily go 24v inverter using 2 12v batteries in series = increase ur wh. (But remember panels voltage must be higher than battery voltagr)
2. I dont like only 1 battery. Might as well consider a solar power station.

Good luck. Have fun. Suspect its gonna come up hair short but good place to start. Leave room to add.
Thanks have good day.
 

Substrate

Solar Addict
Joined
Apr 28, 2021
Messages
675
Location
SoCal
What can be slightly misleading with the "10 hours of daytime" statement is that it doesn't mean that all those hours are actually *usable*.

That is, one needs to consult a solar-insolation chart for the area in which they live, and generally plan by using the winter-hours in those charts.

In other words, just because the sun is out and bright, most commonly the early morning and late afternoon hours are thrown away in calculations. The attenuation which can't be used reliably for calculation during these hours comes from the attenuation of the sun's power (photons) weakening due to longer distances from the sun at lower angles, and more atmosphere to travel through during these times.

Or put even more simply, sunup-to-sundown is not the same as usable/calculable solar-insolation hours.
 

wattmatters

Solar Addict
Joined
Apr 16, 2021
Messages
850
Or put even more simply, sunup-to-sundown is not the same as usable/calculable solar-insolation hours.
Yep.

Hours for solar production are typically a weighted average over a year accounting for the local area weather conditions, azimuth, tilt.

e.g. in Australia the average solar production hours are about 4 for a fixed array. IOW if you have a north facing 300W panel tilted on a typical rooftop, then you will generate 300W x 4hrs = 1200Wh of energy each day, on average over the course of a year. This has nothing to do with how long daylight lasts.

To get a higher value you need to move closer to the equator (but not too close because then tropical weather conditions starts to reduce annual output, and/or have an array which can vary its tilt and azimuth to follow the sun.

10 hours on average would be unrealistic for most people but it is possible if you have dual axis sun tracking and the array in a dry areas (usually away from coastal areas), somewhere near the tropics of Capricorn or Cancer.
 
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