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LORENTZ S

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Required solar power input

LORENTZ S1 pump systems require a properly sized and configured solar array to operate reliably and efficiently.

The required power input varies depending on the system model. Below you will find the minimum recommended solar power input for each pump model, along with important voltage specifications.

Depending on the application and location you may require more or less solar power to meet your water need.

Important: Always follow the minimum recommended PV power and voltage range for safe and reliable operation.

	S1-200	S1-700
Minimum reccomended power	200 Wp (learn more here)	750 Wp Typically 2 or 3 modules in series. (learn more here)
Min. Vmp (voltage at maximum power) for best performance	> 34 V DC	> 85 V DC
Max. Voc (open-circuit voltage)	55 V DC	220 V DC

The open circuit voltage (VOC) of your PV modules must not exceed the maximum input voltage of your controller. If this value is exceeded, the controller may be permanently damaged.

For more information read the following article:

S1-200 systems - Connecting PV modules in series and parallel

Troubleshooting

WARNING - Disconnect power from the controller before performing any installation, inspection, maintenance or cleaning activities on the motor or pump.

Event in the app	Behavior of the LEDs in the controller		What is happening?	How do I troubleshoot the event?	What happens next?
Event in the app	LED Green	LED Red	What is happening?	How do I troubleshoot the event?	What happens next?
Low power 1, 2, 3 or 4 Message in the app: "Please check if the modules are pointing to the sun, are not shaded and are clean"	Blinking	Blinking	The controller tried to start the pump but couldn’t reach the minimum speed due to insufficient solar irradiance.	This is a normal condition during early morning, late afternoon, or low irradiance.	The controller will retry every 2 minutes automatically. You can also restart it manually by toggling the switch off and on.
			The controller tried to start the pump but couldn't reach the minimum speed. Although irradiance is sufficient, the hose or pipe might be blocked or kinked.	Check if the pump rotor is blocked. For S1-200:Remove the pump end body. Clean the rotor and pump end body inside, do not apply grease! (Cleaning instructions here). For S1-700:Remove the pump end. Clean the pump end body inside, do not apply grease! (Cleaning instructions here). Check the entire pipeline for obstructions or kinks.
			The controller tried to start the pump but couldn’t reach the minimum speed. Solar irradiance is sufficient, but the pump end temperature may be too high.	For S1-200:Check the temperature class of your pump (refer here for more information). Ensure the pump end is not directly exposed to sunlight. If the issue continues, replace the pump end and choose one higher temperature class. For S1-700:Make sure the water temperature does not exceed 50 °C [122 °F].
			The PV modules might be shaded, dirty, incorrectly wired or placed, or undersized.	Make sure the PV modules are unshaded and receive direct sunlight. Clean the modules according to the manufacturer's guidelines. Check all connections to ensure they are secure. Verify the PV array meets the voltage requirements. (described above on this webpage).
			The PV array does not provide the required minimum voltage.	Verify that the array meets voltage requirements: For S1-200:[See minimum voltage] For S1-700:[See minimum voltage] Ensure irradiance is adequate and panels are clean and well-positioned.
			A Remote Tank Switch accessory is installed, but the "Low power" event is triggered before the accesory activates.	If a Remote Tank Switch is installed and the system operates at a low TDH (Total Dynamic Head), the controller may not have enough time to evaluate the accessory before showing the "Low power" event. To resolve this, reduce the “Start-up time” value in the S-Connect app: Go to Settings → Advanced Settings → Tank Switch → Remote Tank Switch → adjust the Start-up time to a lower value.