About Romain

Romain is living off-grid with his family in one of the most beautiful tropical islands, Palawan, in the Philippines.

Romain is a Chemical Engineer with a Ph.D. in Chemistry from Ecole Polytechnique, France. He is a surface science specialist and an electrochemist.

He dedicated his studies and early career to scientific research in renewable energy. His first research project goes back to 2006 when he contributed to developing hydrogen storage material for Philips in the Netherlands. In 2010, he completed his Ph.D. thesis: “Toward hydrogen photoproduction by immobilized bio-inspired catalysts.” The thesis was supported by a co-authored article published in Science.

In 2011, he joined the French National Research Agency to support ambitious research projects in the field of Energy. For 7 years, he supervised hundreds of fundamental and applied research projects covering a broad spectrum, including the Energy economy, solar energy, battery storage, smart grids, hydrogen technology, and thermoelectricity.

Currently, he is developing an eco-resort in the Ulugan Bay, near one of the natural wonders of our world, The Sabang Underground River, Palawan, Philippines. Ocean Green is a project focused on sustainability and self-sufficiency. It’s a lodge and an experimental field for sustainable resort development.

Romain led the project in developing an 11 – 30kW off-grid solar system, rainwater collectors, and geo-filters alongside an organic garden for their farm-to-table restaurant and to supply the local market.

Romain also loves sharing his knowledge and practical applications. That’s why he was one of the first to join the team at Climatebiz in 2020.

You will find most of his articles on the topics related to solar energy and battery storage.

Romain Metaye can also be found on, Research Gate, Google Scholar & LinkedIn


PhD in Chemistry, Ecole Polytechnique, CEA Saclay
Engineering degree and Master’s degree in Chemistry, Ecole Nationale Supérieure de Physique et de Chimie de Bordeaux (ENSCBP)

User Posts: Romain Metaye

With the arrival of modular lithium battery technology, building a DIY battery bank is now accessible to non-specialists at a fraction of the cost of a ...

PV panels and batteries both operate with direct current (DC). It's, therefore, natural to assume that you can connect solar panels directly to a ...

The Generac PWRcell vs. Tesla Powerwall — two of the most advanced battery energy storage solutions (BESS) on the market.As a prospective buyer, you may ...

A 1000-watt inverter can power tablets, laptops, and gaming devices, but is it enough for your refrigerator to run efficiently?A refrigerator is the ...

Powerwalls are unique and efficient energy storage solutions. That said, they aren't exactly cheap. It stands to reason why a homeowner would be eager to ...

Running power tools with an inverter is doable if you have the correct size component.Inverters come in many sizes, from a few hundred watts (W) to ...

If you're curious about the number of Tesla Powerwalls your household requires, you've come to the right place!The Powerwall is an efficient way to store ...

Building a DIY solar water pump is an effective and cost-saving way to fulfill all your water needs.Pumping water is essential for many domestic and ...

You'll need the best solar generators to power your house and protect your appliances during power outages.In the US, power outages affect millions' ...

Without a utility grid connection, you’ll need the best off-grid inverter to ensure a steady supply of electricity from your solar panels to your house.An ...

Bluetti vs Jackery – two pioneers’ companies at the forefront of portable solar storage solutions.If you’re an outdoor enthusiast, chances are you’ve ...

Building a DIY solar battery box is your best cost-saving option if you're looking for a portable power station that matches your solar panels.You may ...

Browsing All Comments By: Romain Metaye
  1. Hello Neil, thanks a lot for your comment. You are correct, you only need a DC to DC charger connected to your alternator.
    The alternator will deliver a steady 14V DC and the DC converter will modify it to the right charging profile for your batteries. If you’re looking at some quality DC converters, Victron’s products are a good pick.

  2. Hello Terrence, thanks for your comment. Indeed, charging a lithium battery is not a 100% efficient process. You’ll loose between 1 and 5% of energy. For a 1kWh battery that’s between 50Wh and 10Wh. Then discharging is 99% efficient so you’ll lose 10Wh for a 1kWh battery.
    The cost of the electricity for charging is not included in our lithium battery price because it is a variable information. One could use Solar energy at $0.05/kWh or an other charge it with utility electricity in Hawaii at $0.5/kWh. In addition the price of grid electricity fluctuates over the years.

  3. You’re welcome! You should wire your DC charger directly to the battery.

  4. Hello Red, thank you for your comment. Yes you can charge and power loads at the same time. For example, if your load is 500W and your charging power is 1000W, then only 500W will go into the battery.

  5. Thank you for your comment Dirk !
    All the ESS featured in the article offer time-of-use (TOU) management. As you mention it, without solar panels, the ESS charges when the electricity price is low and power your house when electricity prices are high.
    Now, let’s do the math.
    I’ll take for example, the TOU in California. They have a rate plan named TOU-D PRIME.
    During weekdays, electricity costs $0.21/kWh between 9pm and 4pm and $0.54/kWh during peak hours between 4pm-9pm.
    That’s $0.33/kWh difference!
    If one gets the PowerPod 2 featured in this article, it has a Levelized Cost of Storage (LCOS) of $0.18/kWh. This figure is based on the total number of cycles for this ESS (6000 cycles) divided by its price, inc. installation.
    It means that every kWh that you will charge and discharge from the ESS will cost you $0.18.
    The battery will charge during low hours at $0.21/kWh, add $0.18 and you’ll get a real cost of $0.39/kWh.
    During peak hours, you will be saving: $0.15/kWh with your ESS.
    In the end, you can save money even without solar panels, it all depends on the rate of your local TOU and the LCOS of your Energy Storage Solution.
    To save even more, add solar panels, self-consume your electricity as a priority, then sell the surplus to the utility company.