Electric rickshaws — the bad?
THIS refers to an article on electric rickshaws, titled ‘The good, the bad and the ugly’ in the weekly publication of a local English-language daily on August 4. If electric rickshaws are charging their batteries by utilising illegal low-tension electrical connection, they are cheating the Power Development Board, which is a punishable offence.
However, about overloading the system, these rickshaw batteries are usually charged, say, between 9:00pm and 7:00am, while the electric rickshaws ply throughout the day. During these hours, from around 9:00pm up to, say, 7:00am next morning, when the batteries are charged, power demand is quite low, as most lighting load is off. In some areas in Bangladesh, the demand even goes down by 60 per cent. The maximum demand for power is between 6:00pm and 10:00pm when the PDB power is on full load.
Technically, charging the battery, just by tapping from the LT 415V grid supply is just not possible, as our power supply is AC (alternating current) while, to charge the battery, one needs DC (direct current). For charging you connect an inverter-cum-voltage regulator to the AC LT supply, as batteries are usually charged at 6 or 12 volt DC. So, it is not possible to just tap into the overhead wire to charge your battery.
Regarding damage to transformers, I would be grateful if the writer could outline it. Practically this is not possible to do so easily. It is frankly easier said than done. One can overload the transformer by putting extra and excessive load on the LT side but these all have overload relays that immediately put the transformer offline.
I would request the writer to please know the facts before putting it out publicly.
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