RustyKipper
100 W
Morning chaps,
I'm looking for a more efficient way of charging my 9Ah E-bike battery from my solar shed.
Currently I have a 180W panel charging a 110A lead acid battery in the day that in turn powers a Victron 1200W sine wave inverter powering the battery charger at 230V. This system works well enough but the efficiency is pants, I’ve estimated about 60% which is ok in the summer but is likely to give issues in the winter. Charging my battery after my homeward commute takes 3 hours at 2A (at least that’s what the charger says its rated at). It’s also something of a pain to trog out to the shed 9.00 every night to unplug the charger and refit the battery to the bike.
My plan is to use one of these fellas,
They are the holy grail of boost converters, they accept an input voltage of between 9 and 60V and output anything from 0 – 60V at up to 40A, they even work in constant current mode!! I’ve have some awesome 100A power supplies with these in the past, several can be parralled together to increase current.
I have built many a lead acid charger but these lithium chaps are quite new to me. Am I correct in thinking that I just need to provide the battery pack with a regulated 43.2V at less than 1C ( probably 2A) and let the BMS do its thing inside the battery pack, This would be a boon in both efficiency (95% at full load) and I could leave the charger connected all night as long as I disconnect the motor controller? Or maybe keep the battery outside the shed or in a flame proof box while charging unatteneded.
Also it means I can leave the mains charger at work ready for the charge after the morning commute (about 2 hour charge).
I am planning a much bigger battery pack soon using 12 or 15Ah headway cells.
I am also planning on using one of these boost converters to run a second motor on the e-bike at something higher than 36V as kind of an overdrive.
Any thoughts greatly appreciated.
I'm looking for a more efficient way of charging my 9Ah E-bike battery from my solar shed.
Currently I have a 180W panel charging a 110A lead acid battery in the day that in turn powers a Victron 1200W sine wave inverter powering the battery charger at 230V. This system works well enough but the efficiency is pants, I’ve estimated about 60% which is ok in the summer but is likely to give issues in the winter. Charging my battery after my homeward commute takes 3 hours at 2A (at least that’s what the charger says its rated at). It’s also something of a pain to trog out to the shed 9.00 every night to unplug the charger and refit the battery to the bike.
My plan is to use one of these fellas,
They are the holy grail of boost converters, they accept an input voltage of between 9 and 60V and output anything from 0 – 60V at up to 40A, they even work in constant current mode!! I’ve have some awesome 100A power supplies with these in the past, several can be parralled together to increase current.
I have built many a lead acid charger but these lithium chaps are quite new to me. Am I correct in thinking that I just need to provide the battery pack with a regulated 43.2V at less than 1C ( probably 2A) and let the BMS do its thing inside the battery pack, This would be a boon in both efficiency (95% at full load) and I could leave the charger connected all night as long as I disconnect the motor controller? Or maybe keep the battery outside the shed or in a flame proof box while charging unatteneded.
Also it means I can leave the mains charger at work ready for the charge after the morning commute (about 2 hour charge).
I am planning a much bigger battery pack soon using 12 or 15Ah headway cells.
I am also planning on using one of these boost converters to run a second motor on the e-bike at something higher than 36V as kind of an overdrive.
Any thoughts greatly appreciated.