John Frum
Tell me your problems
- Joined
- Nov 30, 2019
- Messages
- 15,233
I came up with a way to add automatic and configurable charge initiation and termination
to this https://www.iotaengineering.com/pro...r-24v-battery-charging-in-240vac-applications
using this https://www.victronenergy.com/battery_protect/smart-battery-protect
and this https://dlidirect.com/products/iot-power-relay
I named my invention after 2 of my favorite things.
I call it the drinking bird.
The iota charger comes factory configured to deliver ~27.2 volts with no charge termination logic.
It also comes with a "boost pendant" that bumps the voltage +1.2 for a total of 28.4 volts while inserted.
Its gets the battery plenty full for my usage model without the converter ever going into absorption mode.
The smart battery protect and the iot relay use ~0.0017 amps combined.
My usage model is an online uninterruptible power supply.
On the main system board we see the converter and iot relay side by side.
The little green wires coming out of the converter are the "boost pendant".
Ont the bms side of the battery we see that the smart battery protect is connected to my ridiculously oversized balance leads.
The smart battery protect is not in the high current path and therefore reads a 30mv higher than the bms regardless of charge or discharge current.
I would not use 10 awg wire for the balance leads if I were to do this again.
to this https://www.iotaengineering.com/pro...r-24v-battery-charging-in-240vac-applications
using this https://www.victronenergy.com/battery_protect/smart-battery-protect
and this https://dlidirect.com/products/iot-power-relay
I named my invention after 2 of my favorite things.
I call it the drinking bird.
The iota charger comes factory configured to deliver ~27.2 volts with no charge termination logic.
It also comes with a "boost pendant" that bumps the voltage +1.2 for a total of 28.4 volts while inserted.
Its gets the battery plenty full for my usage model without the converter ever going into absorption mode.
The smart battery protect and the iot relay use ~0.0017 amps combined.
My usage model is an online uninterruptible power supply.
Code:
ac {
mains->iot_relay.normally_closed->iota_converter
}
dc {
pos {
|<->battery.pos
|<-ac2dc_charger.pos
|->smart_battery_protect->fuse->iot_relay.control.pos
}
neg {
|<->battery.neg
|->ac2dc_charger.neg
|<-smart_battery_protect.ground
|<-iot_relay.control.neg
}
}
configuration {
set smart_battery_protect.restart $terminal_voltage
set smart_battery_protect.shutdown $initial_voltage
}
On the main system board we see the converter and iot relay side by side.
The little green wires coming out of the converter are the "boost pendant".
Ont the bms side of the battery we see that the smart battery protect is connected to my ridiculously oversized balance leads.
The smart battery protect is not in the high current path and therefore reads a 30mv higher than the bms regardless of charge or discharge current.
I would not use 10 awg wire for the balance leads if I were to do this again.
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