Hi all, this is my 1st post on the forum after reading lot of threads i decided to start with the basics cause sounds little complicated. I would be really grateful if you can help.
I have a small solar system.After many years of using AGM or LeadAcidBatteries to charge from my solar panels (3 x 50w connected in parallel)i decided to move on to 18650 lithium batteries and build a small power wall.
My needs are very basic , main plan is to use my 85w laptop all the day with the sun + charge the battery andin the night without problems for 5-6 hrs together with3 x 4w 12V led lights. For the laptop i have a 300W 220V inverter that is more than enough for what i need and sometimes i might use other small devices like the 40W soldering iron. For mobile etc i charge them via the 5V usb ports of the charge controller or with adapter from 12V car cigarette lighter to USB.
I plan to use recycled 18650 batteries as already i have plenty of them from old laptops to start from. If i understand correctly the mah to AH conversion i make an hypothetical calculations:let's say that i have 50 x 18650 batteries 2.200mah this would give me a 100AH battery? I understand because of the old cells i would not get that exact number but based on this example is my math correctly and it can be simple as that?
Hopefully you can help me to build my system and get rid of the heavy batteries that i need very often to change (35kg for 100AH lead acid that i must soon change) and is so difficult to carry on hand, i do this for hobby but also is important for living as i do not have electricity in my hut!
So next time i move to the city what should i buy including wires, fuses, bms etc?
Safety is VERY important for this project as i live in the forest so apart that of coursei will everyday monitor the system i will have to be secure that will not start fire if i'm not there for 1 day.
I am attaching a picture of my 1st attempt to create a very small battery with 6x 2.200ah cells all of them charging good to 4.2V , can i connect this battery +/- to the solar charge controller (PWM chinese with LCD) and use it as a test on my 12V lights or it my approach is completely wrong?
My soldering skill is not excellent as you will see but i can manage with patience, i used sandpaper and flux before solder the cells, i want to know if my connections are wrong and other suggestions for further expansion of the battery.
Right now i have 24 x 18650 2.2200ah good cells , this would give me about 50AH battery? How should be connected in series or parallel? is 4s 6p correct? (this means 4 series of 6 batteries in parallel?)
thank you so much!
I have a small solar system.After many years of using AGM or LeadAcidBatteries to charge from my solar panels (3 x 50w connected in parallel)i decided to move on to 18650 lithium batteries and build a small power wall.
My needs are very basic , main plan is to use my 85w laptop all the day with the sun + charge the battery andin the night without problems for 5-6 hrs together with3 x 4w 12V led lights. For the laptop i have a 300W 220V inverter that is more than enough for what i need and sometimes i might use other small devices like the 40W soldering iron. For mobile etc i charge them via the 5V usb ports of the charge controller or with adapter from 12V car cigarette lighter to USB.
I plan to use recycled 18650 batteries as already i have plenty of them from old laptops to start from. If i understand correctly the mah to AH conversion i make an hypothetical calculations:let's say that i have 50 x 18650 batteries 2.200mah this would give me a 100AH battery? I understand because of the old cells i would not get that exact number but based on this example is my math correctly and it can be simple as that?
Hopefully you can help me to build my system and get rid of the heavy batteries that i need very often to change (35kg for 100AH lead acid that i must soon change) and is so difficult to carry on hand, i do this for hobby but also is important for living as i do not have electricity in my hut!
So next time i move to the city what should i buy including wires, fuses, bms etc?
Safety is VERY important for this project as i live in the forest so apart that of coursei will everyday monitor the system i will have to be secure that will not start fire if i'm not there for 1 day.
I am attaching a picture of my 1st attempt to create a very small battery with 6x 2.200ah cells all of them charging good to 4.2V , can i connect this battery +/- to the solar charge controller (PWM chinese with LCD) and use it as a test on my 12V lights or it my approach is completely wrong?
My soldering skill is not excellent as you will see but i can manage with patience, i used sandpaper and flux before solder the cells, i want to know if my connections are wrong and other suggestions for further expansion of the battery.
Right now i have 24 x 18650 2.2200ah good cells , this would give me about 50AH battery? How should be connected in series or parallel? is 4s 6p correct? (this means 4 series of 6 batteries in parallel?)
thank you so much!