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Installation report: 100 Ah lithium battery and charging booster in the Sunlight T66

Installation report of the Supervolt 100 Ah LiFePO4 battery and the 30 A charging booster in the Sunlight T66 motorhome, which was provided to us by our customers.

Guest article: Installation report 100 Ah Supervolt lithium battery and charging booster in the Sunlight T66

Our customer sent us a field report on the installation of our 100 Ah Supervolt LiFePO4 battery and the (12V 30A) charging booster in his Sunlight T66 motorhome. In this article, he explains the details of the installation, the advantages of the new power supply and what to look out for when converting.

Table of contents

Sunlight T66 profile

  • Semi-integrated motorhome on a Fiat base
  • First registration: 2018
  • A solar panel on the roofUnder the driver’s seat an EBL 119 from Schaudt
  • Body battery AGM 95AH under the passenger seat
  • Our power consumption: quite low

Planning the power setup

After extensive internet research, I decided on the Supervolt battery because I liked the price, performance and company philosophy best.

Do I need a charging booster?

Once this was clear, the difficult question arose as to whether a charging booster was needed. Opinions differ widely on the Internet. To be able to form a better opinion, I phoned Supervolt’s technical support team, who recommended that I install a booster in any case.
So before I start removing everything again in six months’ time to retrofit the charging booster, I decided to install it straight away and ordered the Charging booster B2B 12V 30A.

You can find a blog post about charging boosters here:

Charging booster in the motorhome

Charging booster in the motorhome

2. May 2024 No Comments

The installation of a charging booster in a motorhome is always recommended. In this article, you can find out why this is the case and what a charging booster actually does.

Read more "

Selection of additional components

For the battery, I chose the Supervolt LiFePO4 100Ah (105Ah) 12.8V lithium battery with Bluetooth, as it is installed in the interior of the vehicle and therefore does not require heating.
At this point, I was so immersed in the subject that I also considered installing an inverter so that I no longer had to use the mobile inverter on the 12V socket for my laptop, for example. Because the inverters from Supervolt seemed a little too big for me, I chose an inverter from another company.
Now all that was missing were the cables. There is a link to another provider on the Supervolt website where I was able to configure and order the cables.
The ordered components were delivered promptly after the order was placed. Supervolt was particularly quick to deliver. I ordered on Sunday evening and received the delivery on Tuesday (Supervolt also offered me express delivery for an extra charge). By the end of the week, I also received the suitably assembled cables.

Here you can access the Supervolt cable cross-section calculator.

Note:
With the introduction of our new battery series at the beginning of October 2025, the SE series models no longer have RJ45 interfaces to external devices (e.g. Victron, Truma iNet, etc.), as these are not required by all users.
Due to the elimination of these interfaces, we can no longer offer the SE seriesat a lower price with immediate effect.
The PRO series however, still has the corresponding interfaces.

>> Discover our LiFePO4 SE batteries directly in the online store <<

Installation of LiFePO4 battery & charging booster

Preparatory steps

Installation began with the removal of the two seats. These are each screwed into the console with six hexagon socket screws. Once I had also disconnected the plugs for the airbag, I was able to remove the seats.
Caution: To avoid error messages in the vehicle, the ignition should not be switched on until the seats have been fully reinstalled.
Then I de-energized the entire system by disconnecting the starter battery and the body battery and setting the battery isolator switch on the EBL to “off” (so that no power comes from solar).
In order to be able to lay cables between the two seat consoles, I had to remove the floor cover between the cab and the body (this is no longer original, as I had already modified it earlier).
Finally, remove the old battery and the reassembly could begin.
The new battery was quickly installed because it fitted exactly in the place of the previous one.

Installation of charging booster

Of course, things turn out differently than you think and not everything could be implemented as I had planned. The charging booster didn’t fit under the driver’s seat, which I only realized after the console trim had been removed. So I had to mount it outside and replace the plastic paneling with a stable base plate made of floor laminate. In retrospect, I actually like this solution better, as the charging booster can cool better.
I connected the positive cable from the starter battery, which was previously clamped to the back of the EBL, to “Start II” positive on the B2B and connected the “Bord I” positive to the positive terminal input on the EBL. I routed the earth cable from the charging booster via the floor duct to the negative terminal of the body battery under the passenger seat.
Now I needed the D+ signal for the charging booster. I found it on the front of the EBL, the purple cable on block 2. I cut the cable at the point where the signal for the SAT system was tapped with the “current thief” in order to reconnect all three connections with a Wago terminal.

Inverter installation

My original project would have been finished if I hadn’t had to install the inverter. I placed it close to the body battery, on the right-hand side of the passenger seat console. Although it is on the door side, it doesn’t get in my way when getting in and out of the car. Here, too, I used a laminate panel as a substructure. I connected the inverter directly to the body battery. The inverter is fused with 175 amps. I installed a Victron mega fuse holder with a corresponding fuse.
For the cable dimensions, I used the cable configurator as a guide. The cables between the charge booster and battery are 8 mm² and from the battery to the inverter 22 mm².

Last steps

For visual reasons, I also covered the rear passenger seat console with laminate instead of the original plastic part.
Before installing the seats, I attached the battery terminals to the new lithium battery. I secured the seat screws with liquid threadlocker (e.g. Loctite) to avoid any nasty surprises on the road.
Finally, I put the terminal clamps back on the starter battery. There was a lot of tension when starting the ignition. But everything worked, and it still does today. The Bluetooth connection between the battery and the cell phone works great and the app is also very easy to use.

Conclusion on LiFePO4 installation and initial experience

At first I had a lot of respect for this project. But if you read the Supervolt website carefully, a lot is explained and you can find useful links.
Both before the purchase and during the conversion phase, Supervolt’s telephone support was easy to reach and I always received competent help and advice. The decision to go with Supervolt was exactly right for me!
Converting to a lithium battery gives me a much better feeling when traveling, as we spend most of the time without a shore power connection. I can view consumption and charge status at any time via the app. Using this data, I also discovered that our satellite system and the TV don’t draw any power from the body battery at all, but are connected to the starter battery. I changed this so that the power now comes from the body battery and I no longer have any nasty surprises when starting the car.
We’ve been on the road for over a week since the conversion. Everything works great and I always have a good overview of the power consumption and charge status with the battery app.
In summer weather, the 100 Ah battery seems to be somewhat oversized, as I have only used a maximum of 15% of its capacity so far. The charging booster has also hardly had anything to do so far, as the PV module did most of the work until the onward journey.
But I think that the power requirement will be significantly higher in the other seasons and that I have chosen the right components.
Many thanks to the Supervolt team!

Acknowledgments

We would like to take this opportunity to thank our customer for the very well-described report! By publishing these instructions, we hope to be able to help you replace AGM batteries with our lithium batteries in your Sunlight T66 motorhome.

With the new battery, nothing stands in the way of your next vacation. We wish you a safe journey and unforgettable trips.

If you are also planning to convert your vehicle yourself, please write to us ([email protected]). We will be happy to give you a discount on the purchase of your battery for a report.

Supervolt LiFePO4 batteries and accessories

You can find all our LiFePO4 batteries in our store. Whether for motorhomes, boats or solar systems – our batteries can be used anywhere
You can also find suitable installation accessories such as solar regulators, charging boosters and inverters directly from us:

Lithium batteries
Accessories

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