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Question of the Day: Have you ever ordered a product online and received a fake knock-off?
Light or lamp with a lithium battery
- Thread starter zll
- Start date
Thank you!LS starting at 18:00 will let it run for the 2 hours to test.
I will measure the pack voltage and check the time before putting it on charge. Then i can see how long it takes to charge up again
Right so i just connected a amp/volt meter to make it easier instead of using 2 multimeters.
So this was on charge for almost the whole day except for LS 10:00-12:00 voltage did not go higher.
Taken exactly when power was restored (I switch off our mains breaker so asked wife to switch on so i can take pic) would have liked more output amps
(Was on at full brightness mode)
Will see how long it takes to charge might even open it up if it takes to long. Will see if amps can maybe be increased somehow haven't seen the circuitry yet
So this was on charge for almost the whole day except for LS 10:00-12:00 voltage did not go higher.
Taken exactly when power was restored (I switch off our mains breaker so asked wife to switch on so i can take pic) would have liked more output amps
(Was on at full brightness mode)
Will see how long it takes to charge might even open it up if it takes to long. Will see if amps can maybe be increased somehow haven't seen the circuitry yet
It dropped quite a bit in 2 hours. Will it even last for 4 hours? What would be the cut off voltage of the bms? Charging at 2wRight so i just connected a amp/volt meter to make it easier instead of using 2 multimeters.
So this was on charge for almost the whole day except for LS 10:00-12:00 voltage did not go higher.
Taken exactly when power was restored (I switch off our mains breaker so asked wife to switch on so i can take pic) would have liked more output amps
(Was on at full brightness mode)
Will see how long it takes to charge might even open it up if it takes to long. Will see if amps can maybe be increased somehow haven't seen the circuitry yet
It would take almost a day to charge at that rate xD.
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supersunbird
Honorary Master
It dropped quite a bit in 2 hours! Will it even last 4 hours? What would be the cut off voltage of the bms? Charging at 2w
Most of the lights don't charge quick enough, especially for Stage 6 and up.
What I do with mine is put them off at 6 in morning and on at 6 in evening, so that during daytime loadshedding they do not run and only charge.
Eurolux FS276 Rechargeable LED Emergency Light 2W
www.checkers.co.za
Not sure will let it burn and see if it makes 4 hours and according to the bms specs it's 2.50v per cell.It dropped quite a bit in 2 hours. Will it even last for 4 hours? What would be the cut off voltage of the bms? Charging at 2w
No wonder they say 16-20 hours for a full charge. I found by changing the resistance of R7 you can increase and decrease the current without changing the voltage. But the HUGE transformer does not have more than the supplied milliamps so out of luck there.
But the 9V dc jack at the back is directly connected to the same wires going to the battery. So whatever amps/volts you input it will go directly to the battery the emergency function still works like it does with normal power.
wow. thank you. some of that "resistance" talk went right over my head (no background in electronics)
.So it may be a good idea to charge it via the 9v jack instead? /goes to look for a 7.5v charger/ power supply.
edit:
Do you think it would be safe to charge the LFPs with 9v?
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wow. thank you. some of that "resistance" talk went right over my head (no background in electronics)
So it may be a good idea to charge it via the 9v jack instead? /goes to look for a 7.5v charger/ power supply.
edit:
Do you think it would be safe to charge the LFPs with 9v?
Definitely the jack would give the quickest charge i am also going to use the jack.
Just going to use a cc/cv buck converter since i only have a 2amp 12v charger spare.
To charge with 9v so,so the only issue comes in when the overcharge function kicks in on the BMS it will then cut the power until it's been lowered or removed. Better to keep it at around +- 7.2v - 7.4v
Ok so gave the jack 9v and it gives out 7.95v on battery terminals. (Internal diode on jack pcb dropping voltage a bit)
Using a cc/cv converter i have set the voltage to 7.40v 2amp still using the 9v input. Even with higher input voltage the buck will keep it at 7.40v (might just drop it a tiny bit)
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Thanks. I see the one at communica is out of stock. If I use this one with a 12v, 3a charger. Is there any way to limit the current to 2a?
https://www.electromannsa.com/products/dual-usb-dc-dc-5v-3a-step-down-module I see it needs a heatsink if it does 3a.
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Thanks. I see the one at communica is out of stock. If I use this one with a 12v, 3a charger. Is there any way to limit the current to 2a?
https://www.electromannsa.com/products/dual-usb-dc-dc-5v-3a-step-down-module I see it needs a heatsink if it does 3a and I would want to keep it simple.
You can use a resistor in line on the + output side.
Ah man I see you are in pretoria side.
These guys also have
XL4005 Step-Down Buck CC&CV Power Module 5A - DIYElectronics
High power buck step down regulator, ideal for battery charging systems or high power LEDswww.diyelectronics.co.za
XL4015 5A 75W High Power Step Down Convertor (CC/CV)
The 5A constant current driver is a power supply that can regulate the current flowing through an LED array in order to maintain the desired level of light output.www.robofactory.co.za
Boosting & Limiting
www.netram.co.za
5A Constant Current Driver
The 5A Constant Current Driver is an LED power supply that regulates the current flowing through an LED array so as to maintain the desired level of light outputbotshop.co.za
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So far so good been burning for 3 hours . Going to let run till it dies to see the cut off voltage
. Going to let run till it dies to see the cut off voltage
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Thanks for this. Did you notice it getting dimmer?So far so good been burning for 3 hours
Not from what i can see wish i had something to test the lumens
May be a good idea to power it via a mini ups or power bank in case of prolonged outage.
So i ended the test could not stay awake LOL
You can see it is a bit dimmer compared to the other pics.
So this is when i put it on charge
Done charging 07:21-9:41 with a 9v 2a adapter
You can see it is a bit dimmer compared to the other pics.
So this is when i put it on charge
Done charging 07:21-9:41 with a 9v 2a adapter
Yes that will work perfectly for extended periods if needed. Just emergency function will not kick in when on ups have to switch it to manual mode then
Is that photo with the 9v adapter + the buck converter?
Yes was set on 7.4v 2A will do final adjustments later when everything is unplugged from test wires and mounted and connected.
Noob question. You connected the 2x 6000mAh cells in series right? That means that the voltage is doubled (3.2v x 2) but the mAh rating remains the same, right?
I am now wondering if the mAh rating of the new lithium Magnetos is correct.
They claim: "Huge 10 000mAh Lithium-Ion battery for a more powerful"
"*Consists of two Lithium-Ion batteries at 5000mAh max capacity each"
If these are connected in series would it not be 5000mAh still?