Free delivery over £75

Try the ultimate electrical design service

1% for the Planet 

Cart 0

JA Solar 385W Solar Panel – Monocrystalline Panel

  • 385W solar panel
  • 12 year warranty
  • 25 year linear power output guarantee
  • Comprehensive certificates for UK, EU, and US markets
  • High-efficiency multi-busbar PERC cells maximise efficiency and guarantee high open circuit voltage


On backorder


Confused about electrics? Our free electrical system design service makes off-grid energy simple.


JA Solar 385W Solar Panel – Monocrystalline Panel – JAM72S03 360-385

JA Solar has been leading the market in high-performance solar panels since 2005. Their panels are used in huge numbers in residential, commercial, and municipal power generation projects all over the world. This is a large single panel, so it’s perfect for higher capacity electrical systems in vans, boats, and off-grid houses. The panel is pre-wired with MC4 connectors, and the sturdy aluminium frame is easily compatible with a variety of mounting systems.

High Tech and High Performance

The JA Solar 385W solar panel is the culmination of intense R&D from a manufacturer with years of expertise behind them. Assembled with high efficiency PERC cells, the half cell configuration of the modules in the panel offers the following advantages:

  • higher power output
  • better temperature dependent performance
  • reduced shading effect on energy generation
  • lower risk of hot spots
  • enhanced tolerance for mechanical loading

The cells are monocrystalline, i.e. the manufacturer has cut them from a single sheet of silicon. This uniformity greatly contributes to their superior efficiency.

PERC Cells

PERC technology is new on the market; it only emerged in 2018. The JA Solar 385W solar panel incorporates this cutting-edge tech. Thus, you won’t find a panel construction with a higher solar power conversion efficiency on the market today. An extra layer at the back of the cell means PERC technology improves light capture, optimises electron capture, and reduces heat generation.

The High Open Circuit Voltage that You Need for Your System

As detailed in our guide on how much solar panel capacity you need for your system, open circuit voltage (Voc) is an important and oft-overlooked factor. Most AGM or lithium leisure batteries require a Voc of around 14V. Voc drops by the same percentage as solar power generation performance. Thus, if your panels are only working at 50% of their capacity (on a cloudy day, for example), this correspondingly cuts your Voc by 50%. This JA Solar 385W solar panel has a high Voc of 48V, so your batteries will charge effectively even at a lower performance threshold. Winter or summer, rain or shine, it’ll be one less thing to think about.

See the datasheet for this solar panel here: ja solar jam60s20-380/mr datasheet

Solar panel mounting options

Depending on your application, the Victron 40W solar panels can be mounted in a number of ways. If you have a roof rack you can mount directly to this. Otherwise, you can use mounting brackets to attach your solar panels to the roof of your campervan.

Looking for a different size solar panel?

View our full range of solar panels, from 20W-455W, from brands such as Victron, Solar Technology and JA Solar.

Products that give back

We are members of 1% for the Planet. This means that for every product purchased from Climbingvan, 1% of the total cost will be given to The Honnold Foundation, to provide solar power to underprivileged communities. If you want your electrical system to have more of a positive impact, purchasing your components from us at Climbingvan will mean you can give back as well as powering your off-grid system.

Product SKU: JAM72S03 360-385

Additional information

Weight 23 kg
Dimensions 200 × 99.1 × 4 cm


12 years

Solar panel size (W)

Open Circuit Voltage (Voc)


Cell type


Short circuit current (Isc)


Maximum power voltage (Vmpp)


Maximum power current (Impp)


Solar panel colour


Solar panel type


Junction box position



There are no reviews yet.

Be the first to review “JA Solar 385W Solar Panel – Monocrystalline Panel”

Your email address will not be published. Required fields are marked *

    Your cart is emptyReturn to Shop

      Want to modify this kit?

      Fill out the form below and one of our engineers will be in touch soon.


      Got a question? Fill out the form below and someone from the team will be in touch soon.

      We donate 1% of our revenue to The Honnold Foundation as a part of our 1% for the Planet commitment, to advance access to solar energy all over the world. You can find out more about the amazing work The Honnold Foundation does here.


      How does it work?

      You place an order

      If you place an order for £250, we will donate £2.50 at no extra cost to you.

      We donate 1%

      Each quarter we donate 1% of our revenue to The Honnold Foundation.

      The world benefits

      Our donation is used to provide those that need it most access to solar energy.

      We offer a range of 0% interest credit options from PayPal Credit and Klarna, so you can spread the cost of your purchase over 30 days, 4 months or 1 year, at no extra cost to you.

      PayPal Credit up to £2,000

      Klarna Credit up to £1,000

      How does it work?

      Add to Basket

      Add the items you wish to purchase to your basket.

      Choose how to pay

      Pay with PayPal Credit or Klarna whichever works best for you.

      Apply for credit

      Get an instant decision and, if approved, complete your purchase.

      Subject to status. Min monthly payment applies. Terms apply. UK residents only. For full details please proceed to checkout and select your preferred credit option.

      Where do you live?