![]() So, if the pumps maximum pressure is 45 psi, then there will be (45 - 7 - 22) = 16 psi to drive the water through the soaker hose. The desired flow rate is at least 2.7 gpm.ĥ0 ft of vertical rise is (50 ft)(0.433 psi/ft) = 22 psiĨ00 ft of 3/4 inch black poly pipe with 2.7 gpm has a pipe friction pressure drop of 0.81 psi per hundred ft, or 7 psi for 800 ft. The pump has to overcome 1) 50 ft of vertical rise, 2) pipe friction in 800 ft of 3/4 inch pipe, and 3) provide enough pressure at the greenhouse end to make a soaker hose work. ![]() Should be able to provide much more than this even allowing for charging efficiency and some cloudy days, so it seems fine.ĭoes the pump have sufficient pressure capability? The optimistic ratings on PV panels, battery charging efficiency of about 80%, and limits of simple charge controllers will result in less than this, and cloudy days must be considered.īut, we only need about 48 watt-hours on a typical day, and the PV On a sunny day, the 30 watt PV panel should be able to provide about (6 hours)(30 watts) = 180 watt-hours a day. Since the actual energy use on an average day is less than 1/5th of this, the battery should have plenty of margin for cloudy days or occasional longer pumping periods. If the battery discharge is limited to 20% of its full capacity for long life, then the allowable discharge is (115 amp-hrs)(12 volts)(0.2 discharge) = 276 watt-hours per day. In watt-hours, this is (4 amp-hrs)(12 Volts) = 48 watt-hours per day. This is (8 amp)(0.5 hrs) = 4 amp-hrs a day Pump is 800 ft from the greenhouse - connected with 3/4 inch black poly pipe.Įnergy use: effective run time is half an hour a day with a draw of 8 amps from the 12 VDC battery. Lets go through the sizing for Stan's situation - you can adjust the numbers for your situation as needed.įlow: About 1 hour every other day at about 2.7 gpm (about 160 gallons per pumping session). This works well because the run time for the pump is not very long and can be handled by the battery, and the PV panel has all day to recharge the battery. Instead of direct PV drive, Stan incorporates a deep cycle 12 volt battery to drive the pump, and then uses a small (30 watt) PV panel to charge the battery over the course of the day. The pump draws about 8 amps, so, to drive it directly with PV panels would have required at least 100 watts of PV array, and perhaps a linear current booster for startup. Stan's solution was to use a relatively inexpensive 12 VDC Shurflo pump that is intended for spraying and RV applications. So, this would have been an expensive solution for the relatively low flow required. Using one of the submersible well pumps that are made to run directly from solar PV panels is a nice solution, but the pumps are expensive and they require quite a bit of PV panel area to drive. Using a conventional AC powered pump would have meant running a lot of wire, and the 800ft distance would have meant a larger than normal wire gage to keep the voltage drop from being excessive. The flow requirement was relatively small at about 3 gpm for for an hour and half a day about 3 times a week. Stan was faced with a difficult garden watering problem in which he had to get water from a spring to a greenhouse that was located several hundred feet away and 50 ft uphill from the spring. The New VersiJet High Capacity Pumps are backed by Flojet’s diaphragm pump technology, a brand enjoying over 35 years of operational excellence.A Simple and Inexpensive High Lift Solar Pumping Setup ![]() Standard Port Size Inlet/Outlet 1/2" HB (4 GPM), 3/4" HB (5 and 6 GPM).Check Valve Materials Glass Filled Nylon, EPDM or Viton®. ![]() ![]() Voltage Options 12 VDC, 24 VDC, 115 VAC, 230 VAC.Self priming, accommodating up to 10ft (3m) (wetted).IPX6 rated pump with a sealed motor and pressure switch, providing years of dependable reliability.Co-injected molded diaphragm technology, ensuring run dry capability, extending the life of the pump upwards of 50%.Robust material selection, suitable for handling a broad range of chemicals.Multiple sizing options, providing flow up to 6 GPM (22.7 LPM) and pressure up to 70 psi (4.8 bar).The innovative new and improved five chamber design offers unequalled performance, capable of handling up to 6 GPM at open flow. The New VersiJet High Capacity Pumps are backed by Flojet’s diaphragm pump technology, a brand enjoying over 35 years of operational excellence. Flojet VersiJet High Capacity Pump 12V, 6 GPM 70 PSI | R8601134A ![]()
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