250w used solar panels for 12v and 48v systems.

While a 24 Volt panel might be just enough to charge 24v battery in theory, it isn't in real life.

Voltage and Amperage fluctuate due many external influences.
Light intensity
Temperature
Dust on the panels
Orientation
Angle

Just to name a few.

The difference is not that big, 10-20%

In the past there where systems to move the panels with the sun.
Efficient, but expensive.
Now most solar garden choose less efficient, and place 10% extra panels as that's cheaper.

Depending on your setup, you might want to consider half cell mono crystalline panel with rotation.
If you have small space and need best possible production on that site, still the best way to go.

As you plan to buy used...
That's probably not the situation.

Still orientation and angle are something that you need to calculate.

Easy as many sits that explain about solar provide those tools.
You only need to provide Postal code or city name.
Site does the rest

When you do the installation, make sure you have the correct tools and have done a few test with connect the MC4 plug into cable and eachother.

The last thing you want is a bad connection with the cable that potentially can cause fire.

There are good crimping tools available for MC4, or simple soldering works perfect.

Don't forget it is supposed to function for +25 years....
Day in, day out.
Rain, wind, heat and cold.
You can forget about it if you make the right connection.
If you do it wrong, the flames will remember you to do it better next time

Totally correct.While a 24 Volt panel might be just enough to charge 24v battery in theory, it isn't in real life.Voltage and Amperage fluctuate due many external influences.Light intensityTemperatureDust on the panelsOrientationAngleJust to name a few.The difference is not that big, 10-20%In the past there where systems to move the panels with the sun.Efficient, but expensive.Now most solar garden choose less efficient, and place 10% extra panels as that's cheaper.Depending on your setup, you might want to consider half cell mono crystalline panel with rotation.If you have small space and need best possible production on that site, still the best way to go.As you plan to buy used...That's probably not the situation.Still orientation and angle are something that you need to calculate.Easy as many sits that explain about solar provide those tools.You only need to provide Postal code or city name.Site does the restWhen you do the installation, make sure you have the correct tools and have done a few test with connect the MC4 plug into cable and eachother.The last thing you want is a bad connection with the cable that potentially can cause fire.There are good crimping tools available for MC4, or simple soldering works perfect.Don't forget it is supposed to function for +25 years....Day in, day out.Rain, wind, heat and cold.You can forget about it if you make the right connection.If you do it wrong, the flames will remember you to do it better next time

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