Dankoff SunCentric

The SunCentric uses solar-electric power to pump as much as 200m3 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 bateries. Maximum suction lift is 3m.

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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.
  • Optimum for circulation of solar-heated water.

Battery Application

A Battery system is best where there is need for constant pressure or pressure on demand, or where a tank is not feasible, or where a battery
system is required for other power applications.

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.
  • If there is more than one 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. Oversizing will improve performance in low sunlight conditions
  • Multiple pumps can be used to provide greater flow.

Suction Capacity

  • Suction limit is 3m at sea level-subtract 1m for every 1000m elevation.
  • For best reliability, minimize or eliminate suction lift by placing the pump low and close to the water source.

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.

Overcurrent Protection

  • Fuse or circuit breaker is required
  • Ampere rating – amps at the pump + 15-25%

Maintenance

  • No routine maintenance required.
  • 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 30V. Typical brush life – 30 x 800/2 = 12 000 peak hours. This represents about 5-8 years of service.

Materials

  • Pump body: cast iron.
  • Impeller: glass filled polycarbonate
  • Seal: carbon/ceramic, industry standard
  • Temperature limit: 60 degrees Celsius

High Temperature Option

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

Warranty

One years against defects in materials and workmanship