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how many days do I need to charge at 80% two 3000mA 4.2V li-ion batteries that c...
vasy_skral

vasy_skral

@copilot how many days do I need to charge at 80% two 3000mA 4.2V li-ion batteries that can charge with 16 123mW 2.76V solar cells in 4s4p configuration through BQ25672RQMR if I will do it on latitude 49 parallel starting today(April 24) and the solar cells are parallel to the ground
3y

copilot

To estimate the charging time of the two 3000mAh 4.2V Li-ion batteries, we first need to calculate the total energy required to charge them to 80% and the average energy generated by the solar cells during the day.
  1. Energy required to charge batteries: Two batteries at 3000mAh * 0.8 (80% charge) = 4800mAh = 4.8Ah At 4.2V, the energy required = 4.2V * 4.8Ah = 20.16Wh
  2. Total power generated by the 4s4p solar cell configuration: 16 * 123mW = 1968mW = 1.968 W
  3. Solar Insolation at latitude 49 in April: Considering an approximate value of 4 peak sun hours (PSH) per day. PSH accounts for variations in solar energy received throughout the day and provides an average value. You can refer to solar insolation maps for more accurate values for your specific location (for example, at the Global Solar Atlas developed by the World Bank).
  4. Average daily energy generated by the solar cells: 1.968 W * 4 hours = 7.872 Wh
  5. Estimated Charging time: Total energy required divided by average daily energy generated: 20.16Wh / 7.872Wh = 2.56 days
At latitude 49, with the given solar cells and BQ25672RQMR, it would take approximately 2.56 days of charging to reach 80% of the battery capacity. Keep in mind that this is a rough estimate and actual charging times may vary due to factors such as weather, shading, angle of the solar cells, and charging efficiency.
3y
3
привіт який максимальний струм та потужність я можу отримати від 16 SM141K04LV в...
vasy_skral

vasy_skral

@copilot привіт який максимальний струм та потужність я можу отримати від 16 SM141K04LV в конфігурації 4p4s?
3y

copilot

Привіт! SM141K04LV - це сонячні панелі з максимальним струмом короткого замикання (Isc) 350 мА та максимальною потужністю 1,4 Вт. У конфігурації 4p4s (4 паралельних ланцюжка по 4 панелі в серії) максимальний струм та потужність можуть бути розраховані так:
Струм: 4 паралельні гілки, кожна з яких має струм короткого замикання 350 мА, отже: I_total = 4 * 350 mA = 1400 mA = 1.4 A
Потужність: У кожному з ланцюжків в серії 4 панелі, кожна з яких має максимальну потужність 1.4 Вт, отже: P_series = 4 * 1.4 W = 5.6 W Є 4 таких паралельних ланцюжка: P_total = 4 * 5.6 W = 22.4 W
Отже, у такій конфігурації максимальний струм буде близько 1.4 А, а максимальна потужність - близько 22.4 Вт. Зверніть увагу, що ці значення можуть змінюватись в залежності від умов освітлення та інших факторів.
3y
6
can I use BQ25672RQMR without MCU or other host controller?
vasy_skral

vasy_skral

@copilot can I use BQ25672RQMR without MCU or other host controller?
3y

copilot

Yes, you can use the BQ25672RQMR without an MCU or other host controllers. The BQ25672RQMR is a highly integrated battery charge management IC that offers a standalone solution for charging and protection in various applications such as wearables, smartwatches, and IoT devices powered by single-cell Li-Ion or Li-polymer batteries.
In standalone mode, the BQ25672RQMR can operate with minimal external components and without any firmware development. The IC has various configurable features, such as charge current, input current limit, and battery voltage regulation, which can be programmed using resistors connected to specific pins.
However, if you need more advanced control, fault reporting, or additional features, you can use an MCU or host controller to interface with the BQ25672RQMR via I2C communication. But for simpler applications, it's possible to use it without an MCU or host controller.
3y
5
New Comment
7
what R\_PROG values on BQ25672RQMR do I need to set for two 3000mA 4.2V li-ion b...
vasy_skral

vasy_skral

@copilot what R_PROG values on BQ25672RQMR do I need to set for two 3000mA 4.2V li-ion batteries that can charge with 0.5C current?
3y

copilot

To set the charge current for two 3000mA 4.2V Li-ion batteries with 0.5C charge rate using BQ25672RQMR, you need to select R_PROG according to the desired charge current. Since each battery has a capacity of 3000mAh, a 0.5C charge rate corresponds to a 1500mA charge current for each battery.
Since the BQ25672RQMR can charge only one battery at a time, you'll need to set the charge current for just one battery (1500mA). The I_CHG formula, which defines the relationship between R_PROG and I_CHG, is given by:
I_CHG(A) = 2048 / R_PROG(kΩ)
To find the R_PROG value for 1.5 A (1500 mA) charge current:
R_PROG(kΩ) = 2048 / I_CHG(A)
R_PROG(kΩ) = 2048 / 1.5
R_PROG ≈ 1.365 kΩ
Since you won't find an exact 1.365 kΩ resistor, you can pick the closest standard resistor value, such as 1.36 kΩ, which would result in a charge current of approximately 1502 mA. Just make sure that your setup can handle the chosen current to avoid any issues due to current handling capabilities.
3y
4

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Documents

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    Assets

    Quadcopter.STEP

    Quadcopter.STEP

    Quadcopter
    760308101103_Download_STP_760308101103_rev1.stp

    760308101103_Download_STP_760308101103_rev1.stp

    760308101103_Download_STP_760308101103_rev13D Model
    1461798011.stp

    1461798011.stp

    14617980113D Model

    Solar Pad made with AI

    Solar Pad made with AI thumbnail
    This is landing pad for qudrocopters that also wireless charge the drone for next fight. This pad have two 18650 Li-ion batteries that power wireless charger and this battaties

    Properties

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    Pricing & Availability

    Distributor

    Qty 1

    Digi-Key

    $87.56–$469.96

    LCSC

    $19.12–$19.35

    Mouser

    $24.27

    Controls