Solar panels 24 V

24V solar panels are those with 60 to 72 cells, used in off-grid installations, motorhomes and 24-volt systems. With power outputs ranging from 150 to 400 W, they are the most versatile type: they can be used both for 24 V battery banks and, with an MPPT regulator, to charge 12 V batteries whilst making the most of all the energy.

300W 24V solar panel: the most popular

The 300 W, 24-volt panel has become the standard for small and medium-sized off-grid installations. It offers a good balance between footprint, price per watt and ease of use, and is compatible with most MPPT controllers on the market without the need for complicated set-ups.
Two 300 W panels connected in parallel to a 24 V battery provide a peak output of around 600 W, which amounts to around 3 kWh on a summer’s day and around 1 kWh in winter. This is more than enough to power a motorhome or a holiday cottage with moderate energy consumption.
We also have the format of 200 W at 24 V, which is useful when headroom is limited or you want to fine-tune the power without exceeding the regulator’s limit.

You need an MPPT controller

A 24 V panel operates at around 30–37 V at its peak power output. If you connect it to a 12 V battery using a PWM regulator, you lose the entire difference. A MPPT controller It converts that excess voltage into additional current: with the same panels, you get between 20 and 30 % more energy.
To work out the correct size of the regulator, divide the total power of the panels by the battery voltage. 600 W on a 24 V battery bank is 25 A, so a 100/30 will do. The same 600 W on a 12 V system is 50 A, so you’ll need a 100/50.

What else is needed?

Solar cable with the correct cross-section — check it in the Cross-section table by power rating—, MC4 connectors, mounting structure and the protections on the DC side.
If the bank is 24V lithium battery, remember to configure the regulator’s charging profile: lithium voltages are different from those of lead-acid batteries.
Tell us your power consumption and the voltage at which your system operates, and we’ll tell you how many panels you need: free advice.