Description
xOverview
Meet the HiLetgo CN3791 Solar Charge Controller Board, a compact MPPT charger designed to transfer energy from a solar source into a single LiPo cell. Built for DIY projects, education, and hobby electronics, this module blends practical power management with straightforward wiring for reliable, switch-mode charging on the go. While it doesn’t promise specific results for every installation, it provides a structured way to explore how solar input can be converted into a usable LiPo charge.
Key capabilities
- Maximum power point tracking (MPPT) helps optimize energy transfer from a solar panel to a single LiPo cell.
- Automatic recharge behavior when solar input becomes available again, supporting continuous operation.
- Battery overvoltage protection and safe termination to reduce risk during charging cycles.
- Clear charge status and end-of-charge indication to monitor progress at a glance.
- Pre-installed four 2-pin JST/PH2.0 connectors for quick, plug-and-play wiring.
- Designed variants for input voltages of 6V, 9V, and 12V to suit different panel/battery combinations.
Specs at a glance
- Input voltage: up to 12V
- Output voltage: nominal 3.7V, full charge at 4.2V
- Max charging current: 2A
- Operating temperature: -40°C to +85°C
- Physical size: 45 x 20 x 9.5 mm
- Interface: 2-pin JST or PH2.0
What’s included
- 1 x CN3791 Solar Charge Controller Board
- 1 x 1-cell LiPo charging module with ready-to-use JST/PH2.0 connectors
- Basic setup for MPPT operation with a solar panel and LiPo cell
Setup and practical use
To get started, connect your solar panel to the input side and attach the LiPo battery to the output side. The module is designed to keep the charging process efficient while protecting the battery from voltage spikes. Its compact form makes it suitable for small solar projects, remote sensors, small robotics, and educational demonstrations that explore energy harvesting and battery charging concepts.
Usage tips
- Choose an input voltage variant that matches your solar panel rating and expected panel–battery voltage gap.
- Use the status indicators to verify charging activity and end-of-charge signals during field tests.
Overall, the CN3791 MPPT board offers a practical, space-efficient solution for charging a single LiPo cell from a solar source. It’s a usable option for hobbyists seeking to experiment with solar-powered battery management without heavy investment in larger systems.
FAQ
Q: What is the CN3791 Solar Charge Controller Board used for?
A: It uses MPPT to charge a single LiPo cell from a solar panel, with status indicators and protective features.
Q: What are the input and output specs?
A: Input up to 12V, output to 4.2V LiPo, max charging current 2A, operating -40°C to 85°C.
Shipping & Return
xReturn Policy
We offer a 30-day return policy, which means you have 30 days after receiving your item to request a return. For Patio, Lawn & Garden items, returns are only accepted for products that arrive damaged, defective, incorrectly shipped, or in a condition that is the fault of the seller.
To be eligible for a return, your item must be in the same condition that you received it — unused, with all original packaging, tags, manuals, parts, and accessories included. Items that show signs of use, installation, outdoor wear, assembly, or damage caused after delivery cannot be returned.
You will also need your receipt or proof of purchase.
To start a return, contact us at gardencanada.ca@gmail.com
All approved returns must be sent to the following address:
Garden Canada – Returns Department
2601 E 28th St, STE 005
Signal Hill, California
United States
If your return is accepted, you will receive a prepaid return shipping label (when applicable) along with detailed instructions on how and where to send your package.
Items sent back without first requesting a return will not be accepted.
You can always reach us at gardencanada.ca@gmail.com for any return-related questions.
Damages and Issues
Please inspect your order upon delivery and contact us immediately if your item is damaged, defective, incorrect, broken, missing parts, or arrives in poor condition. We will evaluate the issue and make it right.
For seller-caused issues (damaged, defective, incorrect), Garden Canada will cover the return shipping cost.
Exceptions / Non-Returnable Items
The following items cannot be returned:
- Used or installed Patio, Lawn & Garden products
- Items showing signs of outdoor use, wear, dirt, or weather exposure
- Plants, seeds, bulbs, fresh flowers, and other perishable goods
- Products returned without original packaging, parts, manuals, or accessories
- Assembled furniture or products damaged during customer assembly
- Customized or personalized items
- Hazardous materials or flammable liquids
- Sale or clearance items
- Gift cards
If you are unsure about your item’s return eligibility, please contact us before sending it back.
Exchanges
Exchanges are only available for unused items that arrived damaged, defective, or incorrect. The fastest way to receive the item you want is to return the original (if eligible) and place a new order once your return is approved.
European Union 14-Day Cooling-Off Period
If your order is shipped into the European Union, you have 14 days to cancel or return the item for any reason. However, Patio, Lawn & Garden items must still be unused, in original condition, and in their original packaging with all included parts and accessories.
Refunds
Once we receive and inspect your return, we will notify you whether the refund was approved. If approved, your refund will be processed to your original payment method within 10 business days.
Please note that your bank or credit card provider may require additional time to process and post the refund.
If more than 15 business days have passed since your refund was approved, please contact us at gardencanada.ca@gmail.com
ORDER PROCESSING TIME
All orders are processed within 2–3 business days after payment confirmation. Orders placed on weekends or holidays will be processed on the next business day.
If there is any delay in preparing your order, we will notify you promptly by email.
SHIPPING TIME
Garden Canada ships exclusively within Canada across all provinces and territories.
Standard delivery: Total delivery time is approximately 5 business days (2–3 business days processing plus delivery time).
Remote or northern regions: 6–10 business days due to distance, weather conditions, and limited carrier routes.
Deliveries to areas such as Yukon, Northwest Territories, Nunavut, and certain rural communities may take longer because of seasonal and logistical factors.
While we always aim for timely deliveries, once a package is handed over to the carrier, Garden Canada is not responsible for carrier delays, service interruptions, or weather-related disruptions.
SHIPPING CONFIRMATION AND TRACKING
Once your order has shipped, you will receive a shipping confirmation email containing your tracking number and a link to track your shipment.
Tracking details typically become active within 24–48 hours after shipment.
SHIPPING RATES
Shipping within Canada is free on all orders.
Expedited or express delivery options may be available at checkout for an additional fee depending on your location.
ADDRESS ACCURACY
Please ensure your shipping address is complete and accurate before placing your order. Garden Canada is not responsible for delays, lost shipments, or delivery issues caused by incorrect or incomplete address information.
DAMAGED OR LOST PACKAGES
If your order arrives damaged, please contact us immediately at gardencanada.ca@gmail.com with clear photos of the package and its contents. We will review the situation and assist you as quickly as possible.
If your package is marked as “delivered” by the carrier but you have not received it, please first:
- Check with neighbors or building management
- Verify the shipping address used during checkout
- Contact your local delivery office
If the issue remains unresolved, please email us and we will help initiate a carrier inquiry or claim when applicable.
INTERNATIONAL SHIPPING
At this time, Garden Canada ships only within Canada. International shipping options may become available in the future.
CONTACT
If you have any questions regarding shipping, please contact us at: gardencanada.ca@gmail.com
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