Agricultural Production
without Pollution
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Agricultural Production without Pollution |
A Comparison - Solar Electric Tractor to Diesel Tractors
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Solar |
Yanmar 240 |
John Deere 770 |
New Holland 1530 |
Landini 55B |
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Power/Speed |
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Traction motor (hp) cont., peak |
20, 60 |
16, 20 |
18, 24 |
20, 25 |
35, 47 |
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Speed (mph) min., max. |
0 - 15 |
0.54 - 8.5 |
0.85 - 13.2 |
0.75 - 12.9 |
0.96 - 16 |
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PTO (hp) cont., peak |
10, 30 |
12, 16 |
16, 20 |
17, 21 |
28, 37 |
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PTO (rpm) mid |
0 - 2,000 |
none |
2,100 |
2,000 |
none |
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PTO (rpm) rear |
0 - 2,000 |
540 & 1,000 |
540 |
540 |
540 |
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Capacities |
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3-Pt. Hitch (lb.) mid |
3,000 |
none |
none |
none |
none |
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3-Pt. Hitch (lb.) rear |
3,000 |
440 |
815 |
950 |
5,720 |
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Fuel (gal.) |
5 - 45 kWh * |
5.8 |
6.3 |
7.3 |
14.1 |
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Coolant (qt.) |
zero |
4.4 |
5.1 |
5 |
6.4 |
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Engine oil (qt.) |
zero |
5.3 |
4.2 |
5.2 |
6.2 |
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Transmission fluid (gal.) |
zero |
4 |
4 |
8 |
12 |
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Starting system (volts) |
none |
12 |
12 |
12 |
12 |
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Dimensions |
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Wheel base (in.) |
65 - 84 |
69 |
61 |
63 |
80 |
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Tread width (in.) min., max. |
48 - 72 |
39 - 49 |
39 - 43 |
43 - 52 |
37 - 41 |
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Turning radius (in.) |
zero |
106 |
102 |
96 |
117 |
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Ground clearance (in.) |
12 - 20 |
11 |
13 |
15 |
12 |
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Weight (lbs.) |
2,000 ** |
1,850 |
2,000 |
2,400 |
5,720 |
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Consumption |
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Energy use/hour (kWh) - hauling |
2 |
20 |
23 |
25 |
35 |
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Energy use/hour (kWh) - mowing |
7 |
32 |
35 |
38 |
43 |
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Pollution |
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Noise level dB(A) |
<40 |
92 |
89 |
87 |
86 |
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Exhaust (cuft/hr.) |
zero |
2,500 |
2,800 |
3,000 |
3,900 |
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Cost |
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Average operating cost/hr. ($) ( 1) |
0.45 |
1.12 |
1.25 |
1.36 |
1.53 |
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Maintenance/yr. (1,000 hr.)($) ( 2) |
120 |
1,690 |
1,745 |
1,900 |
2,430 |
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Battery replacement (10 yrs.) ($) |
1,200 |
70 |
70 |
70 |
90 |
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Motor replacement (10 yrs.) ($) |
zero |
4,000 |
5,000 |
6,000 |
8,000 |
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10 yr. maint., operating cost ($) |
7,900 |
33,170 |
35,020 |
38,670 |
47,690 |
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Tractor cost new |
25,000 |
12,500 |
13,600 |
16,800 |
27,900 |
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Total 20 Year Cost |
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Constant $ ( 3) |
32,100 |
76,840 |
83,640 |
94,140 |
123,280 |
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Renewables Scenario ($) ( 4) |
19,900 |
99,240 |
108,640 |
121,340 |
153,880 |
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* Fuel capacity in the electric tractor is measured in kWh available in the battery packs. The on-board battery pack is 5 to 10 kWh and the tractor can carry up to 40 kWh of auxiliary battery packs. ** The front and rear 3-Pt. hitches on the electric tractor can self load auxiliary battery packs when weight is needed for added traction or to balance implement weight. ( 1) This cost assumes $0.10 per kWh for the electric tractor and $1.50 for the combined cost of gas and oil per gallon.( 2) This cost is based on the manufacturers suggested maintenance schedule for parts and labor.( 3) These figures are double the 10 year maintenance and operating cost plus the cost of the tractor.( 4) These figures are for a new electric tractor in high quantity production at $15,000 and based on the existing combined cost of gas and oil at $5/gal. (fuel cost outside the US.) This cost would also reflect the expected rise in fuel cost early in the next century. |
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AS THE TOOLS WE USE TO GET THERE |
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Steve Heckeroth Homestead Enterprises: Solar Design and Renewable Energy Products Box 151 Albion, CA 95410 phone/FAX 707-937-0338 EMail Us! tractor@renewables.com |
