# PROFESSOR SPARKS’ VERDICT: VANILLA’S CHARGING SYSTEM IS NOW A PROPER LITTLE POWER STATION ⚡🔋🚐

I have spent some time looking over John’s latest electrical setup in Vanilla, and I must say, this has moved well beyond the realm of “a few campervan upgrades.”

What he now has is a coherent charging system.

That distinction matters.

A battery on its own is merely stored energy.

A battery with one charger is useful.

A battery with several carefully configured charging sources, proper monitoring, defined voltage targets, low-temperature protection, solar recovery, alternator charging and mains backup becomes something else entirely.

It becomes an energy system.

And in this case, a rather good one.

The heart of it is the Fogstar Drift 105Ah LiFePO₄ battery, but the real sophistication lies in how John has arranged to refill it.

He now has three principal charging routes:

☀️ Solar via a Victron SmartSolar MPPT 75/15

🚐 Alternator charging via a Victron Orion-Tr Smart 12/12-30

🔌 Mains charging via a Victron Blue Smart IP65 12V/25A

And overseeing the whole operation is the:

📊 Victron SmartShunt 500A

From an engineering point of view, that is exactly the sort of architecture I like to see.

Different energy sources.

One central battery.

Consistent charging philosophy.

Proper monitoring.

And, crucially, a user who has bothered to understand the settings rather than simply selecting “Lithium” and wandering off.

That last point is rarer than you might think.

Let us begin with the central component.

The Fogstar Drift stores approximately:

12.8V × 105Ah = 1,344Wh

So we are looking at roughly:

1.34kWh of nominal stored energy

That is a very respectable amount for a campervan leisure battery, particularly because LiFePO₄ chemistry allows John to use a much greater proportion of that capacity than he could sensibly use from a traditional AGM battery.

That immediately changes the practical experience.

With AGM, users often spend their time protecting the battery.

With LiFePO₄, the system becomes far more usable.

The voltage remains flatter under load.

Charging efficiency is high.

The battery accepts substantial current well.

And the Fogstar’s built-in BMS adds important layers of protection.

Voltage protection.

Current protection.

Cell supervision.

Temperature protection.

And, importantly for John’s plans:

battery heating.

That last feature is particularly relevant because this system is not being built purely for pleasant summer touring.

John intends to use Vanilla through winter.

That means cold mornings, long dark evenings, Webasto heating, lighting, refrigeration and potentially days when solar contribution is modest.

In that context, a heated LiFePO₄ battery makes excellent sense.

This is the most elegant charging source in the system.

No moving parts.

No fuel.

No mains cable.

Just sunlight.

The 200W PV Logic panel feeds the Victron SmartSolar MPPT 75/15.

The controller’s job is to extract the best available power from the panel and convert that into the voltage and current profile the battery needs.

John’s current settings are:

Battery voltage: 12V Maximum charge current: 15A Absorption voltage: 14.20V Absorption mode: Fixed Absorption time: 30 minutes Float voltage: 13.50V Re-bulk offset: 0.10V Automatic equalisation: OFF Temperature compensation: OFF Low-temperature cut-off in charger: OFF

I approve of this configuration.

The 14.20V absorption setting is sensible and conservative.

There is no need to push the battery to a more aggressive upper voltage simply to squeeze out the last tiny amount of charge.

A 14.20V target is entirely suitable for a well-managed LiFePO₄ installation.

The 30-minute fixed absorption period is also sensible.

Lithium chemistry does not benefit from the long absorption phases associated with traditional lead-acid charging.

Once the battery reaches the upper target, a relatively brief absorption phase is all that is required.

After that, the controller drops to:

13.50V float

This is a good choice because it avoids holding the battery at a high voltage unnecessarily.

Equalisation is disabled, quite correctly.

That is a lead-acid function.

Reconditioning a lithium battery would be entirely inappropriate.

Temperature compensation is also off, because lithium batteries do not use the same temperature-adjusted charging strategy as lead-acid batteries.

So the solar side is behaving exactly as it should.

It harvests what it can.

It charges efficiently.

And then it backs away.

Splendid.

Victron SmartSolar setup and monitoring

https://www.youtube.com/results?search_query=Victron+SmartSolar+MPPT+75+15+setup

How MPPT solar charging works

https://www.youtube.com/results?search_query=how+MPPT+solar+charge+controller+works+Victron

Now we come to the muscular part of the system.

The Orion can provide up to:

30A

while Vanilla is running.

This is enormously useful because it transforms ordinary driving into energy recovery.

If John has used a meaningful amount of battery overnight, an hour of driving the following day can replace a substantial portion of that energy.

His configured charging values are:

Maximum charge current: 30A Absorption voltage: 14.20V Absorption time: 30 minutes Float voltage: 13.50V Maximum bulk time: 10 hours Re-bulk offset: 0.10V

His engine detection settings are:

Alternator start detection: 14.00V Delayed start level: 13.30V Start delay: 120 seconds Engine shutdown detection: 13.10V Input voltage lockout: 12.50V Restart: 12.80V

This is where a properly configured DC-DC charger earns its keep.

A modern vehicle charging system is not something I would recommend connecting directly to a lithium leisure battery and hoping for the best.

The Orion regulates the charging process.

It limits current.

It applies the correct profile.

And it avoids draining the starter battery once the engine has stopped.

The engine-detection logic ensures that charging begins only when the vehicle electrical system indicates that the engine is genuinely running.

Then, once the voltage falls sufficiently after shutdown, the charger disengages.

This is important.

The leisure system must never become an accidental extension of the starter battery.

In practical terms, the Orion gives John an extremely valuable winter capability.

Use power overnight.

Start Vanilla the next morning.

Drive.

Recover energy.

That single cycle is going to underpin a great deal of his off-grid winter travel.

Victron Orion-Tr Smart 12/12-30

https://www.youtube.com/results?search_query=Victron+Orion+Tr+Smart+12+12+30

DC-DC charging explained

https://www.youtube.com/results?search_query=campervan+DC+DC+charging+explained

This is the newest major piece of the charging system.

And it is a significant improvement.

A 25A mains charger on a 105Ah battery gives a charge rate of roughly:

0.24C

That is a very sensible rate.

Strong enough to make a real difference.

Gentle enough to remain comfortably within the battery’s capabilities.

John’s settings are:

Maximum charge current: 25A Absorption voltage: 14.20V Absorption mode: Fixed Absorption time: 30 minutes Float voltage: 13.50V Storage voltage: 13.50V Adaptive absorption: OFF Tail-current termination: OFF Recondition: OFF Temperature compensation: OFF

Again, this is logically configured.

The charger has been stripped of functions intended for lead-acid chemistry.

No reconditioning.

No unnecessary adaptive absorption.

No temperature compensation.

No clever tricks that are irrelevant to LiFePO₄.

The charger is simply told:

Bulk charge.

Reach 14.20V.

Spend 30 minutes at absorption.

Then reduce to 13.50V.

That is clear.

Predictable.

And easy to verify.

Which is exactly what I want from a charging system.

And the 25A current means that if John arrives somewhere with mains after having used a substantial portion of the battery, he can restore useful capacity relatively quickly.

That makes the Blue Smart more than a backup charger.

It is a proper high-output recovery method.

Victron Blue Smart IP65

https://www.youtube.com/results?search_query=Victron+Blue+Smart+IP65+25A

Victron lithium charging settings

https://www.youtube.com/results?search_query=Victron+LiFePO4+charger+settings

Victron SmartShunt setup

https://www.youtube.com/results?search_query=Victron+SmartShunt+setup

This is the part I find most satisfying.

Each charging system is different.

Solar.

Alternator.

Mains.

But they are all configured around the same basic charging philosophy.

14.20V absorption

30-minute fixed absorption

13.50V float/storage

That consistency is excellent.

The battery is not being treated differently according to whichever charger happens to be active.

Instead, the entire installation is built around one coherent profile.

That is how systems should be designed.

If we look at the maximum nominal current capability:

Solar:

15A

Alternator:

30A

Mains:

25A

That gives a theoretical total of:

70A

Now, I would not interpret this as an instruction to force all three chargers to maximum simultaneously.

That is not the point.

The significance is redundancy and flexibility.

John has multiple ways of replenishing energy.

Sunny day?

Solar.

Driving?

Orion.

Mains available?

Blue Smart.

That means the system is not dependent upon one source.

And that is exactly what you want when travelling off-grid in winter.

John has also isolated the old Sargent EC155 charger.

I consider that a sensible move.

The habitation system can continue doing what it does well.

But charging the lithium battery is now left to equipment that is specifically configurable and easily monitored.

That provides consistency.

Visibility.

And control.

Three things I value greatly.

The Fogstar is only one part of John’s wider electrical picture.

He also carries several Jackery power stations.

So while the Fogstar handles the core 12V habitation loads:

Webasto

fridge

lighting

general van systems

the Jackerys can handle the larger AC loads:

induction cooking

microwave use

portable mains devices

high-draw appliances

Across the whole setup, John has around:

5kWh of stored energy

including the Fogstar.

That is substantial.

More importantly, those energy stores are supported by several charging routes.

Stored energy is useful.

Recoverable energy is far more useful.

This is where the system stops being an engineering exercise and becomes genuinely interesting.

John intends to use Vanilla throughout winter.

That means scenarios such as:

a pub stop in December

3°C outside

Webasto running

fridge cycling

lights on

music playing

perhaps a projector

phones charging

and no electrical hookup

This is exactly the sort of use for which the system is now well suited.

The Fogstar handles the overnight habitation load.

The SmartShunt shows precisely what has been used.

The Orion recovers energy on the next drive.

The solar contributes whatever the winter sun can provide.

And if mains appears, the Blue Smart can rapidly restore capacity.

It is not a single battery trying to survive.

It is a managed energy loop.

That is an important distinction.

John arrives after driving.

Battery is well charged.

The Webasto runs overnight.

The fridge remains on.

Lights are used.

Phones charge.

The next morning, the SmartShunt shows exactly what has been consumed.

Vanilla starts.

The Orion begins replenishing.

If the sun appears, the SmartSolar contributes.

That is a very sustainable rhythm:

use

drive

recover

park

Here, solar becomes more important.

Winter output will obviously be lower than summer output.

Shorter days.

Lower sun angle.

More cloud.

But solar does not need to replace everything to be useful.

Every watt-hour harvested is a watt-hour that has not been permanently removed from storage.

That extends endurance.

And because John has both the Fogstar and the Jackery reserve, one poor solar day is not a crisis.

This system has margin.

Margin is one of the best things any off-grid system can have.

Now the system starts behaving more like a small microgrid.

The Fogstar carries the 12V loads.

The Jackerys carry heavier AC loads.

The solar contributes when available.

Driving replenishes the Fogstar.

Mains is available as a strong recovery option.

At that point, the question is no longer:

“Will the battery last?”

It becomes:

“How shall I manage the energy?”

That is exactly the shift I would hope to see.

I have seen many campervan electrical systems built around one of two philosophies.

Either:

“Fit the biggest battery possible.”

Or:

“Add gadgets until there is no free plywood left.”

John’s system is better than that.

It is balanced.

It is understandable.

It is measurable.

It is repairable.

And it is matched to the way he actually wants to use Vanilla.

The battery is not excessively large.

The solar is sensible.

The DC-DC charging is strong.

The mains charging is strong.

The monitoring is excellent.

The wider Jackery reserve adds another layer of resilience.

Most importantly, the charging settings are now coherent.

That is what gives me confidence in the system.

Not the headline amp-hours.

Not the number of blue boxes.

The logic.

Here are the key numbers:

14.20V absorption

30-minute fixed absorption

13.50V float/storage

15A solar

30A alternator

25A mains

105Ah LiFePO₄

4% SmartShunt tail current

Put those numbers together and what you have is not merely a battery installation.

You have a carefully configured off-grid charging architecture.

And from my point of view, the most impressive part is not that John can now stay off-grid longer.

It is that he understands why.

That matters.

Because once you understand where the energy comes from, where it goes and how quickly you can replace it, battery anxiety begins to disappear.

And this winter, I suspect Vanilla is going to spend considerably less time parked up at home.

Quite right too.

The experiment is ready.

The instruments are calibrated.

The Webasto is standing by.

The SmartShunt has its clipboard.

And Professor Sparks will be watching the graphs with considerable interest.

⚡🔬🚐🔋

My recommendation?

Take Vanilla out this winter and use the system properly.

A well-designed electrical system deserves field testing.