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This page is about batteries for the machines that work the farm: tractors and farm utility vehicles, solar irrigation pumping, and backup power for farm buildings. It is written for equipment builders, conversion workshops, irrigation contractors and farm-energy installers who need to confirm a battery specification before ordering. If your platform drives itself — sprayer robots, orchard robots and other field UGVs — that is a different duty cycle and it has its own page: LiFePO4 batteries for electric sprayers & agricultural field robots. Flight batteries for agricultural drones are out of scope on both pages. Research date: November 2026.
Three jobs, three different duty cycles
Buyers arrive with one word — “agricultural” — but the battery sees three different jobs, and each one is specified differently. A tractor pack lives on vibration, dust and short high-current bursts. An irrigation pack lives on a solar clock. A farm backup battery may sit idle for weeks and then carry loads that cannot stop. Ordering by the word “agricultural” alone is how projects end up with the wrong voltage, the wrong enclosure or a charger that fights the BMS. Start with the job:
| Work | Duty pattern | Specification decided by |
|---|---|---|
| Tractors & farm utility vehicles | High peak current, long low cruise, hard vibration, seasonal idle periods | Motor controller voltage window, peak current, mounting envelope, ballast role of the old battery |
| Solar irrigation pumping | Daytime-weighted, weather-dependent, long steady discharge | Daily water volume, total head, pumping hours outside the solar window |
| Farm building backup | Standby for weeks, then non-negotiable loads: ventilation, milking, cooling, water | Critical-load list, required autonomy hours, recharge source |
Tractors and farm utility vehicles
Traction is only half the load
A tractor battery does not just turn wheels. It cranks or powers the traction motor, feeds hydraulics, lights, fans and increasingly the electronics of implements. The load profile is spiky: short peaks well above the cruising draw, then hours of moderate discharge, then — on many farms — weeks of standing idle between seasons. A pack specified on capacity alone, without the peak-current and idle behaviour, is a pack that trips its protection in the field or ages in the shed.
Which platform: 24V, 48V or 72V?
The voltage is chosen by the machine, not by preference. Legacy farm machines carry 12V or 24V electrical systems, and a like-for-like lead-acid replacement stays in that world. Purpose-built electric compact tractors, utility vehicles and conversion projects usually sit on 48V or 72V traction platforms, where the pack has to match the motor controller’s voltage window and current limits. Our own inquiry records include a buyer developing a 72V 200Ah tractor battery pack — that class of request is a configuration project, not a catalogue line: motor rating, controller window, peak current and the physical envelope all have to be confirmed together before a pack is quoted. The 48V LiFePO4 battery series is the reference point for the middle platform; 24V and 72V builds are confirmed per machine.
The environment decides the enclosure
Farm duty is dusty, wet and violent in ways warehouse duty is not. Before any quotation, confirm: the dust and wash-down exposure (which drives the enclosure protection rating), the mounting and vibration environment, the operating temperature range, and what happens in the off-season. Seasonal storage is a real specification item for farm machinery — a LiFePO4 pack should be stored at partial charge, disconnected, and checked periodically; unlike lead-acid it does not sulfate while standing, but a BMS draws a small parasitic current that matters over a long winter. One more point conversion workshops flag regularly: on many tractors the old lead-acid battery’s weight is part of the machine’s ballast. A lithium pack of the same capacity is far lighter — check whether ballast has to be added back before the machine goes back to work.
Solar irrigation pumping
First question: do you need a battery at all?
Honest answer first: many solar pumping installations should not buy a battery. If water can be pumped whenever the sun shines and stored in an elevated tank, the tank is the storage — cheaper and longer-lived than any battery. A battery earns its place when pumping must follow a schedule the sun does not keep: early-morning irrigation before heat, drip lines that need constant pressure at fixed times, cloudy-stretch autonomy, or livestock water that cannot wait for weather. If your project is in the first group, we will say so; the battery budget belongs in a bigger tank.
Size by water, not by panel watts
Where a battery is justified, sizing starts from the water, not the array: daily volume in cubic metres, total dynamic head, the pump’s operating point on its curve, and how many pumping hours fall outside the solar window. Those four numbers define the daily energy the pack must deliver and the discharge rate it must sustain. Only then does the voltage platform get chosen — smaller pumping systems commonly sit on 48V-class packs, while larger farmstead systems become a storage project in their own right, up to the containerized ESS scale for big sites. Send the pump nameplate and the water numbers with your inquiry; a quotation built on panel wattage alone is guesswork.
Backup power for farm buildings
Farm backup is not home backup with bigger sheds. The loads that matter — poultry-house ventilation, milking equipment, milk and produce cold rooms, water supply — are loads where an outage is measured in lost animals and lost product, not inconvenience. The duty profile is the opposite of traction: long standby, rare but absolute discharge events, and a recharge source that may be a weak grid, a generator or solar. Specification starts from a critical-load list with honest autonomy hours, and the same discipline as any off-grid build applies — our off-grid energy storage page covers the system side. Packs for this work are configured per site; what we confirm with you is which loads are truly critical, how many hours they must run, and how the battery recharges afterwards.
The configuration checklist: what to send
Eight items turn an inquiry into a confirmable specification. Send what you have; missing items are exactly what the first reply will ask for.
- Machine or system type — tractor, utility vehicle, pump set, or building backup, and what it does in a working day
- Motor / controller nameplate — rated voltage and voltage window, continuous and peak current (a photo of the plate is ideal)
- Duty pattern — working hours per day, days per week, seasonal pattern, and idle/storage periods
- The battery being replaced, if any — chemistry, voltage, Ah, box dimensions and weight (including whether its weight acts as ballast)
- Mounting envelope — available L×W×H, orientation, and how the pack is reached for service
- Charging — charger on hand (voltage and profile), or solar array / grid / generator source for stationary packs
- Environment — dust and wash-down exposure, temperature range, indoor or outdoor mounting
- Quantity and spares — pilot quantity, expected fleet or project volume, and whether spare packs rotate
What we don’t supply
- Complete vehicles or machines — we supply and coordinate battery packs, not tractors, pumps or implements
- Drone flight batteries — agricultural spraying drones are out of scope, as explained on the field robot battery page
- Robot platform packs — sprayer and orchard robot packs are specified on that same page; this page deliberately excludes the robot angle so the two duty cycles are not mixed
Questions buyers ask
Can I swap lead-acid for LiFePO4 on an existing tractor?
Often yes, but it is a confirmation, not an assumption. Four things decide it: the machine’s voltage and starting-current demand, whether the existing charging source has a compatible profile, the physical envelope, and the ballast question above. Send the old battery’s label data and the machine’s electrical details and we will confirm fit or say plainly where it does not work.
What size battery does a solar irrigation pump need?
It is calculated from water, not guessed from watts: daily cubic metres, total head, the pump curve’s operating point, and the hours that must run outside sunshine. In many projects the correct engineering answer is a storage tank and no battery at all — if that is your case, that is the answer you will get.
How should farm battery packs be stored over the off-season?
Partially charged (roughly half), disconnected from the machine, in a cool dry place, with a voltage check every few months. LiFePO4 does not sulfate in storage the way lead-acid does, but BMS parasitic draw over a long idle season can pull a pack down — the check interval is part of the specification we agree with you.
Which certifications apply to agricultural battery packs?
That depends on the destination market and the machine class, and it is model-specific. For the exact configuration you order, we confirm the applicable certification and test-report status in writing before shipment — and where a configuration does not carry what your market requires, we say so before you commit, not after.
Next step: send the checklist items above for your machine or pumping project and we will come back with a configuration confirmation — voltage platform, capacity class, enclosure and charging match — before any price discussion. Request an agricultural battery configuration check.
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