T
[email protected]
- Jan 1, 1970
- 0
I pumped a bunch of water today, using 2 different pumps, one an AC
submersible slightly larger than Gig's, the other a small Bell & Gossett,
probably formerly used in a circulating water heating system, now powered
by a 1/4 HP 24VDC motor. I have some performance and power draw comparisons.
My solar power system is 24 volt. All currents are DC draw from the
battery (DC input to the inverter, in the case of the AC pump). My
inverter is a Trace SW4024, 120 V 4KW sine wave.
The AC submersible pumped 200 gal/hr, current draw from the battery was 13
Amps DC.
The DC pump moved 225 gal/hr, drew 10 A from the battery. (67% of full load
current)
Static head was about 4 ft., friction head was 150 ft. of 5/8" garden hose.
For comparison, I'll use an arbitrary index of gallons per hour per ampere.
Submersible: 200 GPH / 13 A = 15.4
DC: 225 GPH / 10 A = 22.5
DC / Sub.: 22.5 / 15.4 = 1.46 (on a basis of current drawn, the DC is 46%
more effective.)
I had expected a greater difference, and may get more with further
tinkering. The DC pump seems awfully tight, shafts may be mis-aligned.
For what it may be worth.
Tom Willmon
Mountainair, (mid) New Mexico, USA
PIT BULLDOG FOR SALE: Eats anything. Loves children.
Net-Tamer V 1.12.0 - Registered
submersible slightly larger than Gig's, the other a small Bell & Gossett,
probably formerly used in a circulating water heating system, now powered
by a 1/4 HP 24VDC motor. I have some performance and power draw comparisons.
My solar power system is 24 volt. All currents are DC draw from the
battery (DC input to the inverter, in the case of the AC pump). My
inverter is a Trace SW4024, 120 V 4KW sine wave.
The AC submersible pumped 200 gal/hr, current draw from the battery was 13
Amps DC.
The DC pump moved 225 gal/hr, drew 10 A from the battery. (67% of full load
current)
Static head was about 4 ft., friction head was 150 ft. of 5/8" garden hose.
For comparison, I'll use an arbitrary index of gallons per hour per ampere.
Submersible: 200 GPH / 13 A = 15.4
DC: 225 GPH / 10 A = 22.5
DC / Sub.: 22.5 / 15.4 = 1.46 (on a basis of current drawn, the DC is 46%
more effective.)
I had expected a greater difference, and may get more with further
tinkering. The DC pump seems awfully tight, shafts may be mis-aligned.
For what it may be worth.
Tom Willmon
Mountainair, (mid) New Mexico, USA
PIT BULLDOG FOR SALE: Eats anything. Loves children.
Net-Tamer V 1.12.0 - Registered