| The Solar Slowpump was the world's first commercially available low power solar pump. It was developed by Windy Dankoff in 1983. Thousands of Slowpumps have been installed worldwide by ranchers, homeowners, missionaries, health workers, government agencies, etc. Some of our oldest Slowpumps are still in daily service.
Slowpumps are not submersible, but can draw water from shallow wells, springs, cisterns, tanks, ponds, rivers, and streams, and push it as high as 450 vertical feet and through miles (kilometers) of pipeline. Slow pumping minimizes the size and cost of the solar array, wire and piping.
- Slowpump is less expensive than submersible DC pumps, and made in a much wider range of sizes. Wearing parts
typically last 5 to 10 years. Overall life expectancy is 15 to 20 years.
- Rotary vane mechanism (positive displacement) made of forged brass, carbon-graphite and stainless steel
- NSF® approved for drinking water
- Handles sea water, dissolved minerals
- Survives most freezes
- Permanent magnet, DC motor
- AC models use a low-surge PM motor that greatly reduces starting surges, inverter and wire size requirements
- Installation and Service Manual is highly detailed and illustrated
The Dankoff Solar Slowpump is available in a 1/4 horsepower and a 1/2 horsepower model. The following tables will show you which models will meet your needs based on gallons per minute and total vertical lift.
Note: If you plan to power the pump PV-direct, you must add at least 20% to the pump watts.
1/4 Horsepower Models
Total
Lift |
1300 & 2500 Series 1/4 HP - PV or Battery 12V,
24V - 115Vac |
| Pump Number |
| 1322 |
1310 |
1308 |
1304 |
1303 |
2505 |
2507 |
| Feet |
Meters |
GPM |
Watts |
GPM |
Watts |
GPM |
Watts |
GPM |
Watts |
GPM |
Watts |
GPM |
Watts |
GPM |
Watts |
| 20 |
6 |
0.51 |
27 |
0.92 |
29 |
1.25 |
30 |
1.75 |
37 |
2.50 |
48 |
3.25 |
52 |
4.00 |
57 |
| 40 |
12 |
0.51 |
32 |
0.92 |
41 |
1.25 |
48 |
1.75 |
53 |
2.50 |
60 |
3.23 |
69 |
3.95 |
78 |
| 60 |
18 |
0.51 |
36 |
0.89 |
46 |
1.20 |
54 |
1.68 |
64 |
2.40 |
78 |
3.15 |
90 |
3.90 |
102 |
| 80 |
24 |
0.49 |
40 |
0.88 |
51 |
1.20 |
60 |
1.64 |
73 |
2.30 |
93 |
3.10 |
106 |
3.90 |
120 |
| 100 |
30 |
0.49 |
45 |
0.88 |
57 |
1.20 |
66 |
1.64 |
82 |
2.30 |
105 |
3.08 |
124 |
3.85 |
144 |
| 120 |
36 |
0.48 |
50 |
0.88 |
61 |
1.20 |
70 |
1.62 |
90 |
2.25 |
121 |
3.02 |
142 |
3.80 |
165 |
| 140 |
42 |
0.47 |
56 |
0.88 |
66 |
1.20 |
75 |
1.60 |
100 |
2.20 |
138 |
2.92 |
166 |
3.65 |
195 |
| 160 |
48 |
0.47 |
62 |
0.87 |
74 |
1.20 |
84 |
1.60 |
112 |
2.20 |
153 |
2.85 |
187 |
|
|
| 180 |
54 |
0.47 |
66 |
0.86 |
82 |
1.18 |
93 |
1.57 |
122 |
2.15 |
165 |
2.75 |
205 |
|
|
| 200 |
60 |
0.45 |
74 |
0.85 |
89 |
1.16 |
101 |
1.56 |
133 |
2.15 |
180 |
|
|
|
|
| 240 |
72 |
0.44 |
90 |
0.83 |
105 |
1.14 |
117 |
1.54 |
152 |
2.15 |
204 |
|
|
|
|
| 280 |
84 |
0.41 |
102 |
0.81 |
120 |
1.12 |
135 |
1.51 |
175 |
|
|
|
|
|
|
| 320 |
96 |
0.41 |
120 |
0.79 |
138 |
1.10 |
153 |
1.48 |
196 |
|
|
|
|
|
|
| 360 |
108 |
0.41 |
134 |
0.76 |
154 |
1.05 |
171 |
|
|
|
|
|
|
|
|
| 400 |
120 |
0.40 |
150 |
0.73 |
176 |
1.00 |
198 |
|
|
|
|
|
|
|
|
| 440 |
132 |
0.39 |
168 |
0.70 |
202 |
|
|
|
|
|
|
|
|
|
|
1/2 Horsepower Models
Total
Lift |
1400 & 2600 Series 1/2 HP - Battery 24V, 48V -
PV Direct 36V - 115Vac |
| Pump Number |
| 1408 |
1404 |
1403 |
2605 |
2607 |
| Feet |
Meters |
GPM |
Watts |
GPM |
Watts |
GPM |
Watts |
GPM |
Watts |
GPM |
Watts |
| 160 |
48 |
|
|
|
|
|
|
|
|
4.30 |
283 |
| 180 |
54 |
|
|
|
|
|
|
3.35 |
280 |
4.25 |
305 |
| 200 |
60 |
|
|
|
|
|
|
3.33 |
296 |
4.20 |
338 |
| 240 |
72 |
|
|
|
|
2.55 |
266 |
3.30 |
331 |
4.05 |
396 |
| 280 |
84 |
|
|
|
|
2.50 |
302 |
3.25 |
373 |
4.00 |
444 |
| 320 |
96 |
|
|
1.66 |
255 |
2.50 |
338 |
3.20 |
410 |
|
|
| 360 |
108 |
|
|
1.62 |
280 |
2.50 |
374 |
3.16 |
450 |
|
|
| 400 |
120 |
|
|
1.64 |
312 |
2.50 |
406 |
|
|
|
|
| 440 |
132 |
1.10 |
269 |
1.66 |
342 |
2.50 |
451 |
|
|
|
|
| 
