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Leisure Battery Install

IneosGrenadierTech

IneosGrenadierTech

Grenadier Owner
INEOS Agent/Dealer (verified)
Local time
5:27 PM
Joined
Mar 19, 2025
Messages
36
Location
Carlisle, UK
Hi all,

I was asked to design and build a completely custom leisure battery system, including split charging and multiple auxiliary outputs to support a range of devices—from Starlink satellite systems to basic USB phone chargers. All components were hand-selected by the customer to balance reliability, efficiency, and expandability.

This was actually my first project of this kind, and I built it from the ground up with future installations in mind. The system’s modular design means it can be easily adapted or scaled for future custom builds.

One of the key goals was future-proofing the setup. The system was designed with easy integration points for solar power—so adding panels down the line is as simple as plug-and-play. Whether for trickle charging or full off-grid capability, the groundwork is already there.

The project involved careful load analysis, planning for upgrades, and ensuring everything could run safely and independently of the vehicle’s main power system. From fusing and cable sizing to the mounting hardware and monitoring systems, every detail was tailored to meet the user’s unique needs.
 

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IneosGrenadierTech said:
Hi all,

I was asked to design and build a completely custom leisure battery system, including split charging and multiple auxiliary outputs to support a range of devices—from Starlink satellite systems to basic USB phone chargers. All components were hand-selected by the customer to balance reliability, efficiency, and expandability.

This was actually my first project of this kind, and I built it from the ground up with future installations in mind. The system’s modular design means it can be easily adapted or scaled for future custom builds.

One of the key goals was future-proofing the setup. The system was designed with easy integration points for solar power—so adding panels down the line is as simple as plug-and-play. Whether for trickle charging or full off-grid capability, the groundwork is already there.

The project involved careful load analysis, planning for upgrades, and ensuring everything could run safely and independently of the vehicle’s main power system. From fusing and cable sizing to the mounting hardware and monitoring systems, every detail was tailored to meet the user’s unique needs.
Click to expand...
A very clean install. Well thought out.
 
IneosGrenadierTech said:
Hi all,

I was asked to design and build a completely custom leisure battery system, including split charging and multiple auxiliary outputs to support a range of devices—from Starlink satellite systems to basic USB phone chargers. All components were hand-selected by the customer to balance reliability, efficiency, and expandability.

This was actually my first project of this kind, and I built it from the ground up with future installations in mind. The system’s modular design means it can be easily adapted or scaled for future custom builds.

One of the key goals was future-proofing the setup. The system was designed with easy integration points for solar power—so adding panels down the line is as simple as plug-and-play. Whether for trickle charging or full off-grid capability, the groundwork is already there.

The project involved careful load analysis, planning for upgrades, and ensuring everything could run safely and independently of the vehicle’s main power system. From fusing and cable sizing to the mounting hardware and monitoring systems, every detail was tailored to meet the user’s unique needs.
Click to expand...
The led battery monitor..is it specified for Li batteries or lead acid? I suggest that a smart shunt which " counts coulombs" going in/out is the better way to monitor battery charge/discharge due to the Lithium battery's much flatter voltage-discharge curve.
 
DenisM said:
The led battery monitor..is it specified for Li batteries or lead acid? I suggest that a smart shunt which " counts coulombs" going in/out is the better way to monitor battery charge/discharge due to the Lithium battery's much flatter voltage-discharge curve.
Click to expand...
Absolutely Correct... On NL's instruction sheet it states for "two lead-acid batteries".... An LED monitor showcasing voltage alone isn't going to be very helpful with a LiFePO4 battery unfortunately as they maintain very flat voltage curves until depleted
 
There's no voltage sensing circuit in the world that will detect or display Li battery capacity with any meaningful levels of accuracy. Would have been better off using a smart LiFePO4 battery with built-in Bluetooth and shunt and simplify the install. I'm an EE by education and trade if you need any assistance.
 
PDX_Keith said:
There's no voltage sensing circuit in the world that will detect or display Li battery capacity with any meaningful levels of accuracy. Would have been better off using a smart LiFePO4 battery with built-in Bluetooth and shunt and simplify the install. I'm an EE by education and trade if you need any assistance.
Click to expand...
The battery fitted does come with Bluetooth monitoring @IneosGrenadierTech kindly sent me a link for it
 
Is there an actual battery to battery charger with adjustable charge voltage or is it just a solenoid relay? The manufacturer website insinuated it's a relay controller which would be horrible on several fronts....
 
PDX_Keith said:
Is there an actual battery to battery charger with adjustable charge voltage or is it just a solenoid relay? The manufacturer website insinuated it's a relay controller which would be horrible on several fronts....
Click to expand...
???? I'm clueless on all this, which is why I was asking IneosGrenadierTech for help.
 
PDX_Keith said:
Out of all of the B2B lithium charging options on the market, what drove you to chose that National Luna?
Click to expand...
It was all down to the customers research into it, he holds credit for the parts selected.

The batteries are managed using a Victron DC-DC charger, with bluetooth control and smart managing within the Ttian battery itself. The entire system is self managing with great capability
 
The customer wanted an easily accessible monitor that can be seen without needing to visit an app on their phone for a rough idea of what life the Lithium has left when running consumers overnight. It is not necessary, but was something the customer opted to have. It has no effect on the battery system in any capacity.
 
IneosGrenadierTech said:
The customer wanted an easily accessible monitor that can be seen without needing to visit an app on their phone for a rough idea of what life the Lithium has left when running consumers overnight. It is not necessary, but was something the customer opted to have. It has no effect on the battery system in any capacity.
Click to expand...
What everyone is saying is that a voltage based SoC monitor (like the National Luna) is completely irrelevant and won't show any useful data on a lithium set up as they have nearly flat voltage curves
 
The monitor is something the customer opted for, it wasn't under my guidance. The charge and discharge rate is viewed using the bluetooth application, the customer can use the Luna to monitor the main battery also.
 
IneosGrenadierTech said:
The customer wanted an easily accessible monitor that can be seen without needing to visit an app on their phone
Click to expand...
Hence the nice LED display on the Victron. 😁

Then a couple posts later you state the customer can and will open the app. 🤔

As an installer I'd just hope you gave them feedback that what they wanted and purchased was useless and suggest an alternative that actually functions. It's not the same dual battery system that they read about in their 2015 issue of Overland Journal.
 
My custom install was precisely that, custom. Directly applied from the customers demands.

If there were any items in the list that directly affect the workings, inflict damage to other components, or are entirely pointless, I would (as you expect) advise against. To a degree, I have.

A simple battery monitor to show state of charge for both batteries, not entirely precise to minimal voltage, has no complications to the install and has some, albeit very little, reason for being there in my customers eyes.

I appreciate your interest in my post.
 
I've literally just put a Titan/Victron setup in. You've done a tidy job, very envious.

Regarding that 12v isolator - Titan ship you an isolator which disconnects the +ve pole using the press button, it clicks into port 1 on the ethernet of the BMS. Would have saved the unsightly isolator for a small press button which can be surface mounted.
 
CloudVisual said:
I've literally just put a Titan/Victron setup in. You've done a tidy job, very envious.

Regarding that 12v isolator - Titan ship you an isolator which disconnects the +ve pole using the press button, it clicks into port 1 on the ethernet of the BMS. Would have saved the unsightly isolator for a small press button which can be surface mounted.
Click to expand...
Very much appreciated.

Yes, the button is a very nice little touch from Titan. But, again, customer specified for a mechanical switch mounted in plain sight.

Did you mount the button? I noticed there is no securing tabs or back nut to locate it neatly onto a panel.
 
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