100kwh-hunter
Active member
- Joined
- Mar 2, 2019
- Messages
- 1,374
Recently i bought a Dyson vacuum cleaner.
One word: perfect, BUT the battery capacity is low, really to low.
After some searching on You Tube some guy give me an idea: use powertool batteries for it.
So as fond Hilti user i have some broken stuff in the shed.
Iuse Hilti in the construction a lot, no brand can handle it!!! especially the frequency of use.
I had a broken Hilti charger(went for a ~"swim" :blush: )
I ordered from aliexpress a "dummy" battery holder.
https://www.aliexpress.com/item/4000022213625.html?spm=a2g0s.9042311.0.0.1b7d4c4dOrXPo3
Cut both up to fit inside each other.
So i can use my power tool batteries and swap when empty.
Perfect so far: his own bms is in the battery pack, i can charge fast with my normal chargers, triple the amount of capacity per charge and (~free)batteries enough.
However thecut off is in the tools switch.
If you don't use the cut off and if you don't pay attention, the battery will drain to a lower voltage than it is healthyfor the cells.
What is this piece of magic that disconnects the engine and battery when it is getting to low?
Disconnect voltage is around 16v (nominal is 21.6v) 22v tools.
I don't think it would be anything like a 7815 or such, but i would not be surprised if it was one of his bigger brothers.
Other surprises with Dyson(clever against diy!) is the mechanical switch, there will be an electrical switch in the side of the new "battery converter/holder".
Dont get the cells disconnected from the bms or the bms will go in protection mode, also dont enlarge the existing cells, apparently the bms will also go into protection mode.
Or buy one with bms:
https://www.aliexpress.com/item/4000022213625.html?spm=a2g0s.9042311.0.0.1b7d4c4dOrXPo3
.
If someone is interested I can post photos of the full build/transformation.
But with what electronic gizmo I can achieve that disered cut off?
Thanks in advance
One word: perfect, BUT the battery capacity is low, really to low.
After some searching on You Tube some guy give me an idea: use powertool batteries for it.
Iuse Hilti in the construction a lot, no brand can handle it!!! especially the frequency of use.
I had a broken Hilti charger(went for a ~"swim" :blush: )
I ordered from aliexpress a "dummy" battery holder.
https://www.aliexpress.com/item/4000022213625.html?spm=a2g0s.9042311.0.0.1b7d4c4dOrXPo3
Cut both up to fit inside each other.
So i can use my power tool batteries and swap when empty.
Perfect so far: his own bms is in the battery pack, i can charge fast with my normal chargers, triple the amount of capacity per charge and (~free)batteries enough.
However thecut off is in the tools switch.
If you don't use the cut off and if you don't pay attention, the battery will drain to a lower voltage than it is healthyfor the cells.
What is this piece of magic that disconnects the engine and battery when it is getting to low?
Disconnect voltage is around 16v (nominal is 21.6v) 22v tools.
I don't think it would be anything like a 7815 or such, but i would not be surprised if it was one of his bigger brothers.
Other surprises with Dyson(clever against diy!) is the mechanical switch, there will be an electrical switch in the side of the new "battery converter/holder".
Dont get the cells disconnected from the bms or the bms will go in protection mode, also dont enlarge the existing cells, apparently the bms will also go into protection mode.
Or buy one with bms:
https://www.aliexpress.com/item/4000022213625.html?spm=a2g0s.9042311.0.0.1b7d4c4dOrXPo3
.
If someone is interested I can post photos of the full build/transformation.
But with what electronic gizmo I can achieve that disered cut off?
Thanks in advance