Conergy 7526 SunCentric 24Volt Surface Pump

• Solar operated surface pump
• Max lift up to 18.3 m
• Max flow rate 16.0 m³/hour
• Simple installation
• High reliability and life expectation

The SunCentric uses solar-electric power to pump as much as 200 m³ per day from shallow water sources. Applications include irrigation, live stock, domestic water, pond management, water treatment, solar water heating, hydronic space heating and fire protection. These pumps have been in worldwide use since 1989. They can be used without batteries. Maximum suction lift is 3 vertical meters.

Please note: This pump is for direct PV Array use only, not for use with batteries.

Warranty

• 24 Months against defects in materials and workmanship

Basic Specification

• Pumps water from shallow water sources (max suction 3m @ sea level)
• Applications: Irrigation, live stock, domestic water, pond management, water treatment, solar water heating, hydroponics space heating and fire protection Can be used as a booster pump with batteries
• Max Lift = 3m; Max Flow = 68.1 litres/min
• PV direct system is used for water storage instead of battery and is more efficient.
• Linear Current Booster is not required.
• A battery system is used when tank is not an option or there is a need for constant pressure

PV Array-Direct Application

• A PV-direct system uses water storage instead of batteries, this is the simplest and most durable system for most applications.
  
• A pump controller (linear current booster) is not required.
• A solar tracker (optional) will help to maintain optimum flow through the entire solar day.
• Storage of 3-7 days’ water demand is recommended.
• Optimum for circulation of solar-heated water.

Selecting a Pump

• Select the appropriate chart of “PV Array-Direct Applications” or “Battery Applications”.
• Total dynamic head = vertical distance from surface of the water source to the discharge or top of storage tank + pipe friction losses.
• Use the solid line grid for English units. Use broken line grid for metric units.
• Locate the coordinates for the required head and flow.
• Find the pump curve that is nearest to that point.
• If there is more than one curve to chose from, compare the power requirements. If PV-direct, the curve that goes higher will work better during low sun intensity.
• For PV-Direct systems, array size (watts) is critical. Do not undersize the array. Over sizing will improve performance in low sunlight conditions.
• Multiple pumps can be used to provide greater flow.
  

Suction Capacity

• Suction limit is 3 vertical meters at sea level–subtract 1 m for every per kilometer.
• For best reliability, minimize or eliminate suction lift by placing the pump low and close to the water source. This will minimize the possibility of cavitation which causes excessive wear and loss of performance.

Pump Installation

• Pump must be sheltered from rain and direct sunlight.
• Horizontal position: place outlet at the top. It can be rotated to face horizontally or vertically upward.
• Vertical position: place motor on top.

Wire and Pipe Requirements

• Intake pipe: pipe should be as direct and short as possible. Avoid any high point that can trap an air pocket.
• Refer to a pipe sizing chart (included with the pump instructions). Pipe may need to be larger than the pump ports. Undersized pipe will greatly decrease pump performance.
• Size the wire for less than 3 % voltage drop. Undersized wire will greatly decrease pump performance. Refer to a low voltage wire sizing chart (available from Conergy, Inc.).

Over current Protection

• Fuse or circuit breaker is required.
• Ampere rating = amps at the pump + 15-25 %
• Minimum DC voltage rating = volts at the pump X 2. (Type FRN fuses are rated 125 V DC)

Maintenance

• No routine maintenance required.
• Pump can be repaired in the field using ordinary tools and skills, without removing the pipes.
• Instruction manual shows illustrated repair details.
• Motor brushes: typical brush life peak hours = working voltage x 800/3rd digit of model number.
• EXAMPLE: PV Direct curve #60 is Model 7526 working at 30 V.
• Typical brush life = 30 x 800/2 = 12,000 peak hours. This represents about 5-8 years of service.
• Shaft seal has a very long life under normal conditions.
• Purchase spare seals if water is loaded with abrasive silt or if pump can possibly run dry.
• For best reliability, minimize or eliminate suction lift by placing the pump low and close to the water source. This will minimize the possibility of cavitation which causes excessive wear and loss of performance.
  

Materials

• Pump body: cast iron, ASTM A48-76
• Impeller: glass filled poly carbonate
• Seal: carbon/ceramic, industry standard
• Temperature limit: 60°C

High Temperature Option

• Temperature limit: 115 °C
• Impeller: brass
• Brass impeller reduces flow by about 15 % (same watts)
• Order standard pump + High Temp Option
  

Accessories

• Foot Valve (for pump placed higher than water source)
• Float switches: please inquire
• Basket Strainer: swimming pool type, fits on pump inlet, catches debris and allows easy cleanouts; 3.18cm in/out, Item #DSP-11046

Spare Parts

• Seal & Gasket Kit: specify model number, and if high temperature
• Motor Brush Kits: specify model number

Performance

Power Requirements - PV Array Direct Applications

Technical Data