Shipping and delivery
We are proud to offer international shipping services that currently operate in over 200 countries and islands worldwide. Nothing means more to us than bringing our customers great value and service. We will continue to grow to meet the needs of all our customers, delivering a service beyond all expectation anywhere in the world.
How do you ship packages?
Packages from our warehouse in China will be shipped by ePacket or EMS depending on the weight and size of the product. Packages shipped from our US warehouse are shipped through USPS.
Do you ship worldwide?
Yes. We provide free shipping to over 200 countries around the world. However, there are some locations we are unable to ship to. If you happen to be located in one of those countries we will contact you.
What about customs?
We are not responsible for any custom fees once the items have shipped. By purchasing our products, you consent that one or more packages may be shipped to you and may get custom fees when they arrive to your country.
How long does shipping take?
Shipping time varies by location. These are our estimates:
| Location |
*Estimated Shipping Time |
| United States |
10-30 Business days |
| Canada, Europe |
10-30 Business days |
| Australia, New Zealand |
10-30 Business days |
| Central & South America |
15-30 Business days |
| Asia |
10-20 Business days |
| Africa |
15-45 Business days |
*This doesn’t include our 2-5 day processing time.
Do you provide tracking information?
Yes, you will receive an email once your order ships that contains your tracking information. If you haven’t received tracking info within 5 days, please contact us.
My tracking says "no information available at the moment".
For some shipping companies, it takes 2-5 business days for the tracking information to update on the system. If your order was placed more than 5 business days ago and there is still no information on your tracking number, please contact us.
Will my items be sent in one package?
For logistical reasons, items in the same purchase will sometimes be sent in separate packages, even if you have specified combined shipping.
If you have any other questions, please contact us and we will do our best to help you out.
Refunds & returns policy
Order cancellation
All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.
Refunds
Your satisfaction is our #1 priority. Therefore, you can request a refund or reshipment for ordered products if:
- You do not receive them within the guaranteed time (45 days not including 2-5 day processing)
- You receive the wrong item
- You do not want the product you have received (but you must return the item at your expense and the item must be unused)
We do not issue the refund if:
- Your order does not arrive due to factors within your control (e.g. providing the wrong shipping address)
- Your order does not arrive due to exceptional circumstances outside our control (e.g. not cleared by customs, delayed by a natural disaster)
- Other exceptional circumstances outside the control of tech.diydynamic.com
*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on page.
If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.
Exchanges
If for any reason you would like to exchange your product, perhaps for a different size in clothing. You must contact us first and we will guide you through the steps.
Please do not send your purchase back to us unless we authorise you to do so.
D***o –
I bought the 1800W 40A version but after doing some testing it never reached its claimed specifications. maximum input power was 28.5A (the power source can deliver 42A) and max output power was 24.4A with a voltage increase of only 10.8V. it works but does not do what is claimed by the seller.
zahidislam2000@gmail.com –
Thank you for sharing your experience! We’ll review the specifications and work to address any discrepancies. Please contact us for further assistance!
M***k –
I got it damaged second time but fortunately got full refund
K***n –
Working
Customer –
Excellent, everything arrived in good condition, I have not yet tried it so if you want to try it recommended.
S***r –
I love this converter for the Price, I am charging a 72 V battery for a 36 V battery, NOTE! Don’t turn off the input when it’s at full load will blow the mosfet, don’t ask how I know that, other than that, everything is working as it should
M***a –
Unfortunately defective, coil aborted this return sent. About the boost converter, I already have two and these keep going! Very good items, unfortunately I had with the last just bad luck ..
zahidislam2000@gmail.com –
Sorry to hear about the defective unit! We’re glad your other converters are working well. Let us know if you need further assistance!
T***H –
The measurement on the aliexpress advertisement is incorrect. seller picture says “17cm”, atually only 8cm high (See photo screenshot attached)
Customer –
It’s still before use, and it’ll work well, right? I have to test it within 90 days and check it for failure, but it doesn’t work well. It’s not bad. I hope it is. I’m still using it, so I honestly don’t know when to use it.
zahidislam2000@gmail.com –
Thank you for your feedback! Please test it soon, and let us know if you face any issues—we’re here to assist!
J***s –
Staples on time as it is indicated
S***s –
i use it to convert 36v battery to 48v ebike 750watt and its works fine, only in peaks i have a cutoff because of consume
A***5 –
Looks good I still have to test
A***r –
works great both on 20A out and 40A in, thanks
K***i –
perfect and good price
J***r –
Good workmanship, I’ll put it into operation right away and test it extensively. It makes a very good impression.
F***o –
Excellent seller and product as described, too bad that this product is given without an appropriate organiser would be really even more excellent. Precise and fast shipping highly recommended.
A***n –
Came fast working properly
Customer –
I have to test maximum real output power … easy to set…
h***i –
Thank you everything work perfect only I did not know what the 3 turn schakpelasrs were 1 at if you still can give information would appreciate very much .. But the job perfectly.
zahidislam2000@gmail.com –
You’re welcome! The 3 turn schakelaars adjust output voltage, current, and constant current mode. Let me know if you need more details!
A***a –
Everything perfectly checked in the work everything works. Satisfied with the purchase.
K***r –
All right.