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OG Happy

STEM Solar Engineering Vehicle DIY Kit

Regular price $50.99 USD
Regular price $77.97 USD Sale price $50.99 USD
Sale Sold out
Tax included. Shipping calculated at checkout.

【Three Kinds of Engineering Vehicles】Solar Engineering vehicle is a basic solar DIY toy, it is ideal for a do-it-yourself science fair, summer workshop project. It has a total of 3 types of engineering vehicles, namely excavator, mixer truck, bulldozer, loading truck, Burrowing vehicle, and forklift.

【No Batteries Needed】 Solar system toys adopted the latest solar power technology that collects solar heat energy into an electric energy drive motor, which drives the gears to make the truck walk smoothly.

【Easy to Assemble】 Toy engine building kit for kids comes with a detailed user manual, stickers, and all the pieces that built the truck. Beginner model car kit is easy to build for kids 8 and up.【Improve Independent Thinking Ability】 When kids independently complete the assembly of experiment kits, can cultivate children's ability to think independently.  It helps children build a solid foundation in Science, Technology, Engineering and Mathematics at an early age.

【Ideal Gift】Children can assemble engineering vehicle toys with friends or family, which not only cultivates the ability to cooperate with each other but also enhances the parent-child relationships, leaves good memories for children.

 【Product Information】

  • Product Size: 14*13*6.5cm
  • Weight: 130g (one box)  390g (three boxes )
  • Suitable Age: 8+


Free Shipping over $49

We are committed to providing you with the best shipping options, meanwhile ensuring that we provide the very highest levels of responsiveness to you at all times.


Free shipping is offered on orders over $49.

For orders under $49, standard shipping is charged for $5.99. 

We will send you a confirmation email once your order is verified. After verification, in principle, the orders will not be canceled during this period, considering the handling process already start, but we will try our best to communicate with via email or phone to find a good solution.

Allow 1 to 2 business days for processing of Ground shipments.

If we are experiencing a high volume of orders, shipments may be delayed by a few days. Please allow additional days in transit for delivery. If there will is a significant delay in the shipment of your order, we will contact you via email or telephone timely.

Shipping time: This refers to the time it takes from items to be shipped from our warehouse to the destination. 

Normally we ship by standard express, it takes 10-22 business days.  if your address is in remote area (Click here to find the remote area zipcode), the deliver time will be 30-40 days.

Please try your best to provide us with your physical address instead of PO. BOX address. if you provide PO BOX address, we will send you an email to confirm physical address, if no reply within one business days, we have to ship by post channel which will take 30-40 days on the way.

You will receive a Shipment Confirmation email containing tracking numbers once your order has shipped. The tracking number will be active within 24-48 hours.

You may track your order on page TRACKING on our website, or click here to track.

Note: Affected by Covid-19, there will be some delay on the delivery.

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30-Day Return

30-Day Return & Exchange Policy

We want you to feel comfortable and confident when shopping at OG HAPPY, that’s why we offer a 30-day return & exchange policy. If for any reason you're not satisfied with your purchase, you may return or exchange the unused item in its original condition as long as you contact us within 30 days from the delivery date.

Return & Exchange Conditions

1. Items returned without authorization will not be accepted.

2. The time frame for return & exchange must not exceed 30 days from when the original order was received.

3. All items must be returned in their original condition, without scratches or signs of wear, and must not be resized or altered in any way.

4. When returning or exchanging items, customers must use a shipping method that has tracking on it. Returns or exchanges with no tracking will not be processed.

5. For return, any promotional gifts received must be included with the returned items. Otherwise, the retail price of the promotional gift will be deducted from the refund.

Note: Please do not send your return to the address on your package. That is not our return address and will affect the processing of your return.

Contact US

We believe in delivering excellent customer service, and will do everything possible to satisfy our customers. If you have any questions, comments or suggestions, feel free to email us at

Customer Reviews

Based on 3 reviews

This gift can cultivate children's awareness of energy conservation and environmental protection. My child likes solar engineering vehicles very much.


It looks pretty good, it hasn't been taken apart and given to my grandson.


I bought this solar engineering vehicle toy as a gift for my child's 8th birthday. The product needs to be assembled by oneself. My child's understanding ability is relatively poor, so I helped him to complete it together.