At LORENTZ, we typically do not recommend the use of batteries with our systems as a first solution. Our pumps and motors are highly efficient and are designed to operate even under cloudy conditions. In many cases, adding an extra solar module to your existing photovoltaic array is a more cost-effective and maintenance-free solution. Thanks to the MPPT (Maximum Power Point Tracking) technology in the S1 controllers, the system can optimize power usage to pump at maximum speed whenever solar energy is available.
Look at the graphs below. They clearly show how simply adding an extra PV module can significantly increase daily water output—even during the cloudiest months of the year. This solution is not only more cost-effective than using batteries, but it also ensures reliable pumping for the next 30 years.
If water is needed during nighttime hours (e.g., for livestock), we strongly recommend proper water storage during the day. Elevated tanks are commonly used in agricultural applications to ensure 24/7 water availability through gravity-fed distribution.
Alternatively, the S1 systems can also operate with AC power from the grid or a diesel generator through the use of a PowerPack (additional accesory) or a constant DC power supply within the pump voltage range and power. For more information, refer to the page “Using alternative energy sources such as grid or diesel generators”
However, if the installation planning requires using the S1 Controller with batteries, it can be possible by considering some important aspects:
The pump’s speed and water flow will be limited depending on the battery voltage.
Please note the voltage parameters for each S1 controller described in the following article:
WARNING – The voltage for the S1-200 must not exceed 55V, and for the S1-700 must not exceed 220V as this would damage the S1 Controller.
To safely use a battery, you’ll need to install an "MPPT charge controller" appropriate for the size and type of battery you plan to use.
The S1 controller should be connected to the load output of the "MPPT charge controller".
WARNING – Never connect a battery directly to the S1 controller, as this can permanently damage the system.
WARNING – The S1 controllers do not have a low voltage battery disconnect feature, this should be provided by the charge controller
We recommend installing a 15A slow-blow fuse between the charge controller and the S1 Controller. (Some charge controllers already include integrated fuses, in that case, an additional fuse is not required.)
WARNING – When powering the product from batteries or a power supply, a 15 A slow-blow fuse must be used on the controller input.
Below is a diagram to help illustrate the correct wiring:
