Why 60V became the default e-rickshaw pack

If you ask a driver why they moved to a 60 volt rickshaw, they will not say anything about electrical engineering. They will say it pulls better with four passengers, it does not struggle on the flyover, and the controller stopped getting hot.

All three of those are the same physical fact seen from three angles. This guide explains what that fact is, what a 60 V lithium pack actually consists of, what range to expect, and where 60 V stops being the right answer.

The one idea that explains everything else

Electrical power is voltage multiplied by current. If a motor needs 1,200 W, it can get there as 51.2 V × 23.4 A, or as 60.8 V × 19.7 A. Same power, same work done, but the second option moves 16% less current through the system.

That matters because almost everything that goes wrong in an e-rickshaw electrical system is caused by current, not voltage. Resistive heating rises with the square of current: cut current by 16% and you cut heating losses by about 29%. That heat was being generated in your cables, your connectors, your controller MOSFETs and inside the cells themselves.

The last row is what the driver actually feels. Every pack sags — its terminal voltage drops momentarily when a large current is drawn, because of internal resistance. On a 51.2 V pack pulling 60 A, that sag might take the pack to 47 V, a 9% loss right at the moment the vehicle needs power most. The same pack chemistry at 19S drawing 50 A sags proportionally less and from a higher starting point. The motor sees more voltage exactly when it is working hardest, and delivers more torque.

What a 60V lithium pack is made of

Nineteen LFP cells in series — 19S. At 3.2 V nominal per cell that is 60.8 V nominal, which is why you will see the same pack advertised as 60V, 60.8V, 61V and 19S.

Hence the 69V · 22A lithium charger — the number on a charger is the full-charge voltage, not the nominal one. If that still feels strange, the charger matching guide derives it from first principles.

Note also that a fully discharged 19S pack sits at 47.5 V — higher than a fully charged 13S NMC pack. Voltage alone tells you nothing about state of charge unless you know the cell count and chemistry, which is why a voltmeter is a poor fuel gauge on a lithium system.

Range, honestly

The advertised range figures in this market are optimistic, and it is worth being clear about why before quoting any. Manufacturers quote a light vehicle, a single rider, flat ground and steady speed — conditions no commercial e-rickshaw ever meets.

Working figures for a loaded three-wheeler are 40–55 Wh per kilometre. We plan on 45.

Read those as ceilings for a healthy pack in reasonable weather, then subtract for reality: a July afternoon with four passengers and a route full of signals will take 15–20% off. A pack at the end of its warranted life will be at 80% of rated capacity, taking another fifth off. Size for the bad day, not the good one.

The 100 Ah row is where most commercial single-vehicle operators land, and the reason is the interaction between range and charge time rather than range alone. It covers a 100 km day with margin, and it refills in about five and a half hours — which fits an overnight window comfortably, or a long afternoon break at partial charge.

60V against 48V, directly

Adding three cells in series buys you 19% more energy and 16% less current, for 15–20% more money and 8 kg. On any vehicle that carries real loads, that is a straightforwardly good trade.

The one thing it does not buy you is compatibility. A 60 V pack on a vehicle wired and wound for 48 V is not an upgrade — it is an over-voltage. The controller may tolerate it, may go into protection, or may fail outright, and the motor will run outside its design envelope. Converting a 48 V vehicle to 60 V means changing the controller and confirming the motor can take it. That is a workshop job, not a battery swap.

What a working day looks like electrically

Specifications describe steady states. A rickshaw never operates in one. It is worth walking through a real day, because it explains which specifications actually matter and which are marketing.

Morning, full pack

The pack comes off charge at 69.4 V and settles to about 67 V within a few minutes as the surface charge dissipates. Nothing is wrong; this is normal and every lithium pack does it. Drivers who watch a voltmeter often think the pack is losing charge on the stand.

Pulling away, loaded

This is the hardest moment of the day, repeated several hundred times. The motor demands peak current — 45–55 A on a 19S system with four passengers — for one to three seconds. Pack voltage sags, recovers as the vehicle gets moving, and the cycle repeats at the next signal. Over a day this is a few hundred high-current pulses, and it is the duty that separates a pack built for traction from a pack built for solar storage.

Mid-afternoon, hot

Ambient 43 °C, pack internal temperature perhaps 50 °C after hours of cycling. LFP tolerates this far better than NMC does, which is the main reason it dominates Indian commercial three-wheelers, but capacity and cycle life still suffer at sustained high temperature. Ventilation around the pack matters more than most people think, and a pack packed tightly into an unventilated steel box will run measurably hotter than one with air around it.

Evening, the flat part of the curve

Between roughly 90% and 20% state of charge, a 19S LFP pack sits between about 64 V and 61 V — three volts across seventy percent of its usable energy. This is why voltage-based fuel gauges are so poor on LFP, and why a proper BMS with coulomb counting is worth paying for. Without one, the driver’s first reliable warning is the pack falling off the end of the curve, which arrives suddenly.

Night, on charge

Constant current at 22 A for four and a half hours or so, then the taper. The balancing happens in the taper: the BMS bleeds charge off cells that reach 3.65 V early so the rest can catch up. Cutting the charge short every night to save an hour means the pack never balances, and an unbalanced pack loses usable capacity steadily. Let it finish at least once a week.

What the BMS has to handle at 60V

Lower current is easier on the BMS, but the requirements do not disappear. For a 19S commercial traction pack we specify:

• 50–60 A continuous discharge, with headroom for 100 A+ momentary. Note again that this is the continuous figure, which is often a third of the number on the marketing sticker.
• Per-cell monitoring on all nineteen cells. Some cheap boards monitor groups rather than individual cells, which means a single weak cell is invisible until it fails.
• Balancing. More cells in series means more opportunity for drift. Nineteen cells need active attention; a balancing current under about 50 mA will not keep up with a hard-worked pack.
• At least two temperature sensors, positioned in the cell stack rather than on the board.
• Low-temperature charge cut-off. Charging LFP below 0 °C causes permanent damage. In north Indian winters this is a real scenario, not a theoretical one.

Our BMS guide goes into what each of these does and how to tell a genuine smart BMS from a protection board with a Bluetooth chip glued on.

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19S LFP packs built to your capacity, tray dimensions and connector, with a BMS specified for commercial e-rickshaw duty. Made and tested in New Delhi since 1994.

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The fleet argument

For anyone running more than a handful of vehicles, 60 V changes the arithmetic in a way that is easy to miss when looking at a single rickshaw.

Charging infrastructure is sized by current, not energy. A depot charging twenty 48 V vehicles at 25 A each is handling 500 A of DC across its chargers; the same twenty vehicles at 60 V and 22 A is 440 A for more delivered energy. Over a depot’s worth of cabling, breakers and connectors, that difference is real money and real heat.

Second, standardising on one voltage across a mixed fleet removes an entire category of error. The most common expensive mistake in a multi-vehicle operation is a driver plugging a 60 V pack into a 58 V charger, or worse the reverse. One voltage, one charger type, one spare pack that fits everything.

Third, uptime. A 100 Ah 19S pack covers a 120 km day, which for most urban operations means one charge per vehicle per night and no midday shuffling of vehicles between charging points. We cover depot design and swap-versus-charge economics in our guide to EV fleet battery management.

Specifying your pack

Send us these six things and we can quote accurately:

1. Confirm the vehicle is a 60V system

   Five 12 V batteries originally, or a controller marked 60 V. If you are converting from 48 V, say so — the controller has to change too.

2. Your longest realistic day

   In kilometres, on the worst route you actually run. Not the average, and not the best case.

3. Motor rating and controller current limit

   These set the BMS continuous rating. If you do not know them, a photograph of the controller label usually has both.

4. Tray dimensions in millimetres

   Length, width and height of the available space. This constrains capacity more often than budget does, and it is the single most common cause of a pack that has to be rebuilt.

5. Charging window

   How many hours the vehicle stands still. This sets the charger current, and there is no point buying a 22 A charger for a vehicle that sits for eleven hours.

6. Connector photograph

   Both the pack side and the charger side.

If you are choosing between 48 V and 60 V and the vehicle could take either, tell us the daily distance and typical load and we will tell you which one we would fit. Over about 100 km a day, or with consistently full loads, the answer is nearly always 60.