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 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 a battery, it can be possible by considering some important aspects:
The pump’s speed and water flow will be limited depending on the battery voltage.
For reference, the S1-200 pumping system with a voltage of:
- 24 V → will reach approx. 1270 rpm
- 36 V → will reach approx. 1965 rpm
- 46 V → will reach max speed: approx. 2500 rpm
For the S1-700 pumping system with a voltage of:
- 48 V → will reach approx. 1550 rpm
- 89 V → will reach max speed: approx. 3300 rpm
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". The S1 controller should be connected to the load output of the "MPPT charge controller".
Additionally, 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.)
Please select a battery "Charge controller" that is appropriate for the size and type of battery you plan to use.
Never connect a battery directly to the controller, as this can permanently damage the system.
Below is a diagram to help illustrate the correct wiring:
