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Required solar power input (low power)

LORENTZ S1 pump systems require a properly sized and configured solar generator 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 pumping system, 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 recommended power	200 Wp	750 Wp Typically 2 or 3 modules in series.
Minimum voltage	24 V DC	See note ⁽¹⁾
Min. voltage for best performance (Vmp)	45 V DC	95 V DC
Max. open-circuit voltage (Voc)	55 V DC	220 V DC

Note ⁽¹⁾: For best performance, the minimum voltage is 95 V DC.

Lower voltages may be possible for pumping applications with lower head. Please consult your distributor if you require more information.

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 articles:

S1-200 systems: connecting PV modules in series and parallel

S1-700 systems: connecting PV modules in series

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	Flashing	Flashing	The controller can´t start 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 can´t start although the solar irradiance is sufficient.	Blocked pump end: For S1-200: Remove the pump end. Clean the rotor and pump end inside, do not apply grease! (Cleaning instructions here). For S1-700: Remove and clean the filter on the pump inlet.
				Blocked or kniked pipe/hose: Check the entire pipeline for obstructions or kinks.
				Wrong pump end temperature class: For S1-200: Check if the temperature class of your pump matches the water temperature (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].
				Shaded, dirty, incorrectly wired, incorrectly placed or undersized PV modules: 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). For S1-200: [See minimum voltage] For S1-700:[See minimum voltage]
			A Remote Tank Full Switch accessory is installed, but the "Low power 2" event prompts before the controller identifies a full tank.	If a Remote Tank Switch is installed and the system operates at a low total dynamic head (TDH) compared to the maximum head of the pump (see datasheet "S1-200" or "S1-700"), the pump might stop with a "Low power" error due to the closed float valve before the controller starts to evaluate the "Remote Tank Switch" event. To resolve this, reduce the default value for the “Start-up time” in the S-Connect app: Go to Settings → Advanced Settings → Tank Switch → Remote Tank Switch → adjust the Start-up time to a lower value. (Refer also to the "Remote Tank Switch" event)
Low power 3, 4			The controller can´t start due to insufficient solar irradiance.	This is a normal condition during early morning, late afternoon, or low irradiance.

LORENTZ S

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Required solar power input (low power)

Troubleshooting

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