BEM® Solar-Bicycle Description

The BEM® सवित्रे™  Savitré - Solar bicycle is different from all other electric vehicles with respect to its charging needs.  The Solar bicycle does not need to be plugged into an electric socket for charging!  No need to hunt for an electric socket at your destination or place of work. Simply park the bicycle with the solar panel facing the sun for approximately 4 hours to recharge the battery of the e-bicycle after  25 kms of daily travel. 

Harness solar energy even while travelling. During day travel, the DC motor of the Solar bicycle usually draws only 80% to 85% of the total current requirement from the Li-ion battery while the Solar panel supplies the rest (15% to 20%). Reduced burden on the battery means longer life of the battery.  The slower charging process over 6 hours under the sun is also recommended to enhance the battery life. (In sharp contrast, fast charging from electric outlets reduces battery life). 

Looking for a low loss charging solution for your E-bicycle? A 230 Volt AC to DC conversion is inefficient. Introducing the higher efficiency DC to DC (Solar to Battery) conversion with Maximum Power Point Tracking (MPPT) for faster charging with a smaller solar panel. 

About the BEM® सवित्रे™  Savitré MPPT  Solar Charge Controller

The BEM® सवित्रे™  Savitré - 2 Amps MPPT  Solar Charge Controller consists of MPPT digital controller and photovoltaic drivers and is designed to control high efficiency DC/DC conversion used in photovoltaic based Li-Ion battery charging application. It is a 2 Amps (Max.) Solar True Maximum Power Point Tracking (MPPT) algorithm based charger for 37 Volt (Nominal), 42 Volt (Maximum) Li-ion battery. This charger provides you with the ability to extract the maximum possible power out of your Solar panel of rating 12 Volt, 40W, and feed it into the  rechargeable Li-ion battery. This means that the E-Bicycle battery would get fully charged in the shortest possible time with a smaller sized (lower cost) Solar panel.  Recommended size of solar panel is 12V, 40W that can be easily fitted on the rear carrier of a standard bicycle 

Set-up is easy as well. Simply, plug the solar panel into one (input) side of the solar charge controller and the e-bicycle battery into the other (output) side, then Switch ON the charger and the battery would start charging at the fastest rate! Ensure that the solar panel is facing the sun, avoid shadows, and keep the panel surface clean for best performance.   

Salient Features of BEM® Savitré Bicycles : 

• A 2 inch LCD Display that displays the Speed, Odometer - Total Distance covered in km, Trip Distance in km & battery charge status.  

• A 5 speed PAS (Pedal Assist) control that gives the rider an ability to choose the level of assistance that is needed from the battery while pedalling.

• Cruise Control:  After twisting / rotating the throttle handle by a fixed degree and by  maintaining a steady speed for a time duration greater than 5 seconds, the  motor controller would enter the 'Cruise Control' mode (indicated accordingly by a symbol 'P' on the LCD Panel). Thereafter, the rider is free to release the throttle handle while the motor controller takes over the function of maintaining the set speed or 'cruise control mode'. The motor controller would exit the cruise control mode when any of the following conditions get satisfied: (a) Any of the brake levers are pressed, or (b) The Throttle handle is again rotated, or (c) The Pedals are rotated.      

• A Strip LED Tail Parking Light and Brake Light mounted on rear for safety. Tail Parking light goes ON when switch is turned ON, regardless of whether day / night, for safe riding in all weather conditions. When brakes are applied, bright brake light goes ON with increased lumen output for better visibility and increased safety. 

• Detachable plug and socket arrangement for the Hub motor for easy wheel removal in case of tyre replacement  or puncture  repairs. 

Three Operation Modes in BEM® Savitré Bicycles : 

1. Throttle Mode: Switch ON the Power by turning the key clockwise. Gently rotate the throttle handle anticlockwise to accelerate. Retain the position of handle rotation to cruise at the desired speed. Let go off the handle to allow it to get back to the original (zero) position to cut off battery supply to the motor and free wheel - cycle continues to move due to inertia. With a  5Ah Battery one can  cover a distance of 15 to 20 kms in this mode 

2. Pedal Assist Mode (PAS): Switch ON the Power by turning the key clockwise.  Do not use the Throttle handle. Instead press your foot on the pedal. The Pedal Assist Sensor (PAS) will detect your pedalling speed and assist manual power with battery power. The PAS mode allows you to travel the same distance with less manual effort. Battery gets drained less in the PAS mode in comparison to the Throttle mode, thereby enabling one to cover larger distances. With a  5Ah Battery one can  cover a distance of 25 to 30 kms in this mode. 

3. Manual Pedal Mode: Switch OFF the Power by turning the key anti-clockwise. This would disable both PAS and Throttle modes. The bicycle gets transformed back to a human powered, pedal driven one. This mode is particularly useful to safely return  back home,  when you run out of battery power.  The 5Ah Battery does not get drained in the manual pedal mode. 

Tip: Apply brakes only when  needed. Applying brakes unnecessarily wastes energy.

Specifications: 

1. Maximum Distance per day: A BEM® Savitré Bicycle with a fully charged battery, can cover a distance of 10 kms in Throttle mode, and 25 kms in Pedal Assist (PAS) Mode.  

2. Maximum Speed: The maximum speed is limited to 30 km/ hour to comply with bicycle lane safety regulations.

3. Time taken to Charge the Battery from Solar Panel : On a bright sunny day, typically takes 4 hours to charge a fully discharged battery 

4. Time taken to Charge the Battery from AC mains: Typically takes 2 hours to charge a fully discharged battery 

5. Time taken for Battery Discharge: Typically takes 1 hour to discharge a fully charged battery at maximum speed. 

Safety Features: 

1. Rear Red Parking Light: An exclusive  BEM® Bhoomee Bicycle safety feature is that it is fitted with a red rear parking light which lights up when the Light Button is pressed and toggled 'ON'. The powerful red LED light is visible from over 100 meters.   

2. Rear Brake Light: Another exclusive  BEM® Bhoomee Bicycle safety feature is that the Rear Light module also has a red 'Brake' Light that lights up when any of the two or both the brake levers are pressed. The brake light, composed of powerful red LEDs, is in addition to the parking light LEDs, is independently controlled, and  is also visible to vehicles approaching from the rear and over 100 meters away.   

3. Bell :   A rotary mechanical Bell is also fitted as a safety feature to enable the rider to ring and warn pedestrians and other vehicles particularly when the rider is riding the bicycle in a manual mode with the electric switch and hence the Horn in a OFF state.

4. Mirror:  For safety on roads that have merged traffic, with no separate bicycle lanes, when most of the other powered vehicles are eager to overtake the low speed bicycle, a rear view mirror is most helpful.  A small cute mirror is fitted on the right handle to give the rider a glimpse of the fast approaching vehicles from the rear.  

BEM® Savitré™ SOLAR ELECTRIC ON TATA® STRYDER ROWER™ Bicycle configuration:

• A Solar cum Electric Retrofit over a brand new 26" bicycle model, designed for any gender (male or female), MTB  - Tata®  Stryder Rower™. 

• Front Shocker/Suspension instead of rigid front suspension and dual disc brakes instead of normal brakes, and with rear integrated carrier. 

• 26x17 TIG Welded Steel Frame, 26" x 2.125" tyres

• 40W, 12V Solar Panel with fittings on the rear for easy mounting on the rear Carrier - detachable

• An Aluminium Alloy Centre Stand - helps take the weight of the solar panel more evenly than a side stand

• BEM®  Savitré™ Solar MPPT Charge Controller, Input: 12V, 3 A; Output: 32V to 42V, 1 Amp through 2.1 x 5.5 mm  DC plug; with Input Switch and LED  indicators with Warranty (OLED Display can be offered at extra cost). 

• 180 Wh, 36V, 5.2 Ah Lithium Ion Battery with Manufacturer's Warranty.

• Powerful BLDC HUB Motor: 36V - 250 Watt Motor, centrally placed for easy balancing  while riding. Brush-less motor means  longer life 

• Motor Controller: 36V, 12 Amp 

• Throttle Handle - Full size, Right side for anticlockwise rotation

• Key Lock  to Switch ON Motor Controller + matching pair of keys

• AC to DC Charger , Input: 230V, 0.5A; Output: 42V, 2A through 2.1 x 5.5 mm  DC plug; with LED  indicators with Warranty. 

• Big (2 inch) LCD Display that displays numerous ride related parameters such as: 

  • Battery symbol indicating balance charge

  • Battery voltage - for finer charge level indication

  • Speedometer - for current speed of bicycle

  • Odometer for total distance travelled

  • Trip km for distance covered during the current trip

  • Time for time elapsed since commencement of trip

  • Pedal Assist Levels ranging from 1 to 5 

  • Cruise control - for travel at a constant speed without need for keeping throttle handle rotated.

  • Brake Symbol - if either brake lever is pressed

  • Error conditions if any (for easy fault detection)

• Buttons on LCD Cluster

  • ON/OFF Button - Keep pressed for 3 seconds to switch on the electric supply (to motor and other circuits). Press again to switch off. 

  • '+' Button - To increase the Pedal Assist Level (Maximum Level : 5)

  • '-' Button - To decrease the Pedal Assist Level (Minimum Level : 5) 

• Head-light  - Powerful High intensity LED Light when 'Light' button is in ON State.

• Rear Red Brake Light - High Intensity LEDs to warn vehicles behind whenever brakes are applied, for safety.

• Rear Red Tail Parking Light - Separate set of LEDs can be kept continuously ON during day or night by pressing 'Light' button in ON State for safety.

• Horn - Beeps whenever 'Horn' push button is pressed

• Handle mounted Switch Cluster - conveniently placed to operate Light or Horn by left hand

• Rigid plastic box for Motor Controller - protects controller. 

• Rear View Mirror - To view the traffic behind you or overtaking you.

• Tilt Mechanism for Panel - The tilt mechanism uses the spring loaded grip of the bicycle carrier, to offer the desired tilt to face the sun directly.   It also provides an ability to absorb shocks on a rough terrain. 

• Thicker 26 inch Spokes for rear Rear wheel

• Pedal Assist Sensor (PAS) for Pedal Assist mode

• Water Bottle + Carrier Clip

• Wire cable lock for Bicycle + matching pair of keys 

• Warranty of 12 months for motor and controller.

• Gross Weight: 27 kgs

Solar Bicycle Overview

Bicycles are the most common and most numerous (> 2 billion) vehicle amongst any kind of vehicle whether human powered or motorised ever produced by mankind. Invented over 2 centuries back (by the German Karl von Drais in 1817), today we see a major transformation - solar bicycles. 

Currently, solar bicycle is the only electric vehicle that provides a fully sustainable, environmental friendly, motorised solution to one's travel needs (upto 25 kms per day). 

Go cycling! Roam the remote country side! Venture out to areas where there is no access to electricity or petrol pumps! Go where no man has gone before with a Solar Cycle!

Truly Sustainable Living: Be totally off fossil fuels and electric grid. Zero running cost. Travel upto 25 kms/day  with a 40W panel attached to your cycle. Use Solar. Save Mother Earth!

No Registration or Driving License required: Can't get a driving licence for your under 18 teenager? Current regulations state that those between the age of 16 to 18 can obtain a license for driving a 2-wheeler with engine capacity less than 50 cc. Many teenagers aged 17 years or less are observed to be illegally riding a registered vehicle, with engine capacity of 100 cc or higher, at high speeds contributing to higher rate of accidents on Indian roads.  Best answer is to ride to school with an environmentally sustainable solution - a solar bicycle - whose speed is limited to 30 km/hour. 

Bicycle to Work: Wish to make a transition to a healthy lifestyle? Don't have time to go to a gym?  Ride a Solar cycle to work. Can choose between manual pedalling, power assisted pedalling, or full power throttle without pedalling with a solar bicycle.  

Bring Your Own Panel: As the BYOD (Bring your own device) policy is becoming more popular, carrying your own panel to work has even more advantages. No need to search for a charging point at work. Simply park the vehicle under the Sun and the battery will silently get charged while your work. 

Safety First: In sharp contrast to a fast charging process from the electric utility's ac mains that has resulted in numerous vehicles catching fire, the solar charge process is an safe and elegant one, that is gentle on the batteries and enhances its life too.

Charge while you ride: Keep the Solar charger switched ON while you ride along with your panel. The solar panel will supply approximately 15 to 20% of the BLDC motor's  needs while you ride. This means that the battery would be supplying only 80 to 85% of the energy and thus getting drained less, again enhancing the battery life. This also means that you can  cover larger distances after a full charge.  

Pedal your way back: Run out of battery power? Unlike other e-vehicles you do not get stranded in the middle of nowhere. Pedal back home.

Low Loss / High Efficiency Charging Process: When you charge the battery from a 230 Volt ac electric mains, an AC to DC conversion takes place which is inefficient. This means high temperature - low reliability operation, or requirement for forced cooling or bigger heat sink for the charger.  Many AC to DC chargers are also seen to inject harmful harmonics into the AC system.  Unlike this, the Solar to Battery charge process is DC to DC which is more efficient, which means that the charger can be smaller in size, more reliable, no need for cooling fans, less noise, etc. 

Optimum Charging Process: Unlike other chargers, the solar charger is microcontroller based and intelligent. The ARM controller chooses an optimum - Maximum Power Point Tracking (MPPT) point for the DC to DC (Solar to Battery) conversion for efficient charging with a smaller solar panel that can be carried on a bicycle. 

Charge in the Parking Lot Under the Sun: Staying in an Apartment or an Upper Floor? With Lithium Batteries getting placed inside the bicycle frame it becomes more and more difficult to charge the battery from an electric ac mains point; the entire bicycle needs to be lifted to the Apartment. Unless, you opt for the far more convenient alternative solution - Solar charging in the parking lot under the Sun!

Unique E-vehicle: No other E-vehicle other than a Solar Bicycle can boast of all or any of the above unique features!

Silent Operation: Unlike an Internal Combustion (IC) engine that 'explodes' once every 4 strokes, a BLDC motor offers silent and smooth operation.

Easy Start: An Internal Combustion (IC) engine needs to be cranked to start either with a manual kick or with a battery of a high capacity.  The solar bicycle has a simple start procedure - simply rotate the throttle handle. No kick start. No mis-firing. Saves your knee ligaments! 

Centre Stand: - An Aluminium Alloy centre stand helps take the weight of the solar panel more evenly than a side stand to keep the bicycle in balance in an upright position

Tilt Mechanism - An innovative tilt mechanism for the solar panel is designed around the spring loaded grip of the bicycle carrier. It gives an ability to offer the desired tilt to face the sun for faster charging. The carrier spring also absorbs shocks on a rough terrain such as a mountain road and thus helps protect the delicate solar panel from getting damaged. 

Features for Safer Riding: The retrofit adds safety features such as a powerful headlight, a loud horn, rear view mirror, a continuously ON tail light at the rear, and a powerful brake light on the rear to warn the vehicles behind when brakes are applied.

Low Cost to Upgrade your E-bicycle: Riding your e-bicycle without solar upgrade is not truly environmentally friendly. The low cost BEM Solar upgrade kit gives you the satisfaction that you are doing your bit to save the environment.  

AS 26T ROWER DD IC

SKU:  6025010695

Description: ASSEMBLED SOLAR BICYCLE 26x2.125 MTB ROWER DD IC GRAY941GRN

Maximum Retail Price MRP (inc. GST) : ₹30,000 

Special Ex-Works (ExW) Discounted Price : ₹ 23,800 (+ 5% GST) or

ExW Sale Price: ₹ 24,990 (incl. of all taxes)

HSN Code: 87116090

AS 26T Rower IC DD is one of a kind, the road beast is the perfect example of masculinity and style. With trapezium tubing MIG welded frame, Dual disc brakes with alloy levers, chain Wheel with plastic guard, plastic body reflectorized pedal and all the modern features that a super cycle must have. This beast roars masculinity and class.

STRYDER - a TATA product.

Manufactured By:

Stryder Cycle Pvt Ltd, Property no.1838,

B3 to B8 & A-4 Focal Point ,

Ludhiana, Punjab -141010