# THE LITTLE BLUE BOX THAT MIGHT FINALLY CURE MY BATTERY ANXIETY 🔵⚡🚐

I have bought another blue box.

That sentence probably tells you everything you need to know about how far down the campervan electrical rabbit hole I have now disappeared.

This particular blue box is a Victron Blue Smart IP65 12V/25A battery charger.

It does not have wheels.

It does not have a touchscreen.

It does not contain two kilowatt-hours of lithium.

It will not make Vanilla faster, warmer, prettier or louder.

And yet I have a feeling this unassuming little charger might become one of the most important bits of electrical kit I have ever added to the van.

Because this is not really a story about a battery charger.

It is a story about finally making Vanilla's entire power system join up.

And possibly, at long last, killing off the last traces of something I have suffered from ever since I started camping off-grid:

Anyone who has slept off-grid in a campervan will understand this.

You go to bed.

The fridge is running.

The Webasto is quietly keeping the van warm.

The lights have been on.

Phones have charged.

Maybe the projector has been running.

Perhaps the MacBook has been out.

You look at the battery level.

Everything is fine.

You go to sleep.

Then at some stupid hour of the morning your brain decides to wake you up and ask:

“I wonder what percentage the leisure battery is on?”

Completely unnecessary.

Completely irrational.

But there it is.

You resist looking.

Ten minutes later you are checking VictronConnect in bed.

That is not camping.

That is electrical surveillance. 😂

I have spent the last few months slowly engineering that feeling out of Vanilla.

The biggest change was replacing the old AGM leisure battery with my Fogstar 105Ah LiFePO₄.

That immediately transformed things.

The Fogstar gives me around:

105Ah × 12.8V = 1,344Wh

So roughly 1.34kWh of permanent lithium energy sitting under the seat.

That means the fridge, lights, Webasto and normal 12V equipment have a proper lithium reservoir to work from.

Not theoretical capacity.

Actually usable capacity.

And lithium does something psychologically useful too.

The voltage stays strong.

The battery feels much less fragile.

It makes the whole van feel more capable.

But naturally, that wasn't enough.

Vanilla now carries a 200W PV Logic solar panel.

Which means on a decent day, while Vanilla is sitting there doing absolutely nothing, photons are quietly arriving from space and becoming electricity.

I still find that brilliant.

Sunlight hits roof.

Roof makes amps.

Amps go into Fogstar.

Fridge gets cold.

Beer remains civilised.

Physics is wonderful.

The solar feeds through my Victron SmartSolar MPPT, and I have become the sort of person who gets genuinely excited when I see a good wattage figure appear on my phone.

Normal people look out of the window and say:

“Lovely sunny day.”

I look out and think:

“That'll be good for 120 watts.”

Driving adds another route.

The Victron Orion Smart 30A DC-DC charger means Vanilla can replenish the Fogstar from the alternator while I am moving.

So already I had two proper energy sources:

☀️ Sun

🚐 Engine

That is pretty powerful in itself.

Park up and solar charges.

Drive away and alternator charges.

But then my power setup got slightly out of hand.

I somehow ended up with several Jackery power stations.

There is the smaller stuff.

There is the 1000 v2.

And then there is the big one.

Forge.

My Jackery 2000 v2.

Calling it Forge probably says quite a lot about how seriously I have started taking all this. 😂

Between the Fogstar and the Jackerys, Vanilla now has roughly 5kWh of total stored energy available.

Five kilowatt-hours.

Inside and around a short-wheelbase VW Transporter.

That is bonkers.

Years ago, campervan electrical systems were basically:

Battery.

Light.

Water pump.

Possibly a leisure socket if you were feeling extravagant.

Now I can potentially run an induction hob while simultaneously charging a drone, laptop and camera, with a diesel heater running from another lithium battery and solar quietly replacing some of it from the roof.

Campervans have changed.

Mine perhaps more than most.

The Jackerys are separate.

That is deliberate.

They are not permanently wired into Vanilla's 12V system.

I like that.

Fogstar runs the van.

Jackery runs the heavy portable stuff.

Two different worlds.

Except there are situations where I want those worlds to meet.

Imagine this:

It is November.

I have found a cracking pub stop somewhere.

Outside it is filthy.

Rain on the roof.

Dark by half past four.

Wind knocking around the trees.

But inside Vanilla?

Warm.

Webasto set around 21°C.

Fridge humming.

Lights on.

Maybe Underworld playing quietly.

Nebula projector on the wall.

Proper winter campervan heaven.

Then I check the Fogstar.

Maybe the previous night was cold.

Maybe solar has been hopeless all day.

Maybe I haven't driven far enough to put much back through the Orion.

The leisure battery is getting low.

Now normally that means choices.

Turn things off?

Go for a drive?

Find hookup?

Start watching every amp?

Not anymore.

Because now I have the blue box.

The new charger is a Victron Blue Smart IP65 12/25.

It can deliver up to:

into the Fogstar.

At roughly 14 volts, that means something like:

heading into the battery.

That is not a maintenance trickle.

That is meaningful charging.

My Fogstar is 105Ah.

So a 25A charge rate works out at about:

0.24C

Which is a very comfortable lithium charging rate.

Not brutal.

Not painfully slow.

Just useful.

If the Fogstar is down around 20%, I can restore a substantial amount of energy in a few hours.

That is the first important bit.

But it still isn't the really interesting bit.

The Victron Blue Smart is a mains charger.

So normally you would plug it into:

🏠 House mains

or

🏕 Campsite hookup

Perfectly sensible.

But I can also plug it into:

And that creates this:

Jackery Forge

⬇️

⬇️

Victron Blue Smart

⬇️

14.2V DC charging

⬇️

Fogstar

⬇️

Vanilla's entire 12V system

That is where the whole project suddenly clicks into place.

My Jackery becomes a portable reserve battery for the leisure battery.

Not permanently connected.

Not complicated.

Not some giant rewiring job.

Just a controlled emergency or tactical energy transfer.

This is the best way I can describe Forge now.

It is basically an:

Years ago, if you were heading somewhere remote, you might carry spare fuel.

Now I carry spare electricity.

And instead of being a red plastic can smelling of diesel, it has USB-C and a display.

Progress. 😂

The Fogstar is my main tank.

Forge is my reserve tank.

The Blue Smart is the funnel between them.

That simple idea completely changes the way I look at the system.

Summer off-grid camping is almost cheating.

Long daylight.

Strong solar.

Milder nights.

The fridge works harder, yes, but the heater barely gets involved.

Winter is the proper test.

Winter means:

🔥 Webasto running for hours

🌙 Long nights

☁️ Weak solar

🌧️ Grey days

💻 More time inside

📽 More projector use

💡 More lighting

And ironically, winter is when I most want Vanilla to be comfortable.

I don't want to sit inside wearing four jumpers because I am protecting the battery.

I don't want to turn the heater off because the SmartShunt says 42%.

I want to use the van.

That is the whole point of building it.

So the Blue Smart is not really about charging faster.

It is about removing another reason to worry.

Imagine a proper winter weekend.

Friday afternoon.

I leave Stafford.

Vanilla's Fogstar is full.

Forge is full.

Fridge is cold.

Diesel tank has fuel.

I head somewhere interesting.

A good pub.

Nice village.

Maybe a walk.

Maybe the drone goes up if conditions are decent.

Back to Vanilla.

Webasto on.

Dinner.

Couple of pints.

Music.

Film.

Sleep.

Next morning the Fogstar has obviously dropped.

During daylight the solar panel puts something back.

Maybe not much.

I move on.

Orion puts another chunk back.

Then Saturday night, same again.

By Sunday morning perhaps the Fogstar has had a proper hammering.

No panic.

I still have Forge.

I plug:

Forge → Blue Smart → Fogstar

Make breakfast.

Have coffee.

Go for a walk.

Come back.

The leisure battery has gained a serious lump of energy.

That is not merely a charger.

That is resilience.

There is absolutely no possibility of me simply plugging this thing in and forgetting about it.

That would be far too normal.

I want to know exactly what happens.

I am planning a proper NIX Power Lab experiment.

Start with the Fogstar at a known state of charge.

Record the Jackery percentage.

Switch on Forge AC.

Connect the Blue Smart.

Then record:

⚡ AC watts leaving Forge

🔵 Blue Smart output current

🔋 Fogstar voltage

📉 Fogstar starting SOC

📈 Fogstar finishing SOC

🔌 SmartShunt amp-hours received

⏱ Total charge time

🌡 Charger temperature

🔋 Jackery energy consumed

And then calculate:

Because there will be losses.

The Jackery converts DC battery energy into 230V AC.

The Victron converts that back into DC.

So 1,000Wh leaving Forge will not mean 1,000Wh entering Fogstar.

The question is:

How close?

900Wh?

850Wh?

800Wh?

That is going to be a genuinely useful number.

Especially for winter planning.

Victron's own introduction gives a good overview of how the Blue Smart range works and how it connects through Bluetooth.

This one is particularly relevant because it looks specifically at the 25A IP65 model, including VictronConnect and its main charging functions.

This is the bit I love.

Vanilla now effectively has several different ways of finding energy.

200W on the roof.

Silent.

Free.

Automatic.

30A through the Orion.

Drive somewhere and charge on the way.

Blue Smart 25A.

House or campsite power.

Jackery power stations.

Including Forge.

And because of the Blue Smart, that portable energy can now replenish the fixed leisure battery.

That is proper redundancy.

Clouds?

Drive.

Not driving?

Use mains.

No mains?

Use Forge.

Fogstar low?

Transfer power.

Jackery low?

Charge it while moving.

There is always another route.

I think this sort of setup appeals to something quite old-fashioned in me.

Redundancy.

Backup systems.

Never rely on one thing if two are practical.

A system should still work when one bit does not.

That thinking is completely normal on ships.

You don't want one failure taking down everything.

And gradually, without really planning it from day one, that is what Vanilla's electrical system has become.

Solar can fail and the alternator still works.

Alternator charging can disappear and mains still works.

No mains?

Portable reserve.

One battery system goes down?

The other remains independent.

It is becoming far more robust than the simple leisure-battery setup I started with.

At first I wanted more battery capacity.

Then I wanted more solar.

Then I wanted better monitoring.

Then better charging.

Then portable power.

But the goal was never actually to own lots of electrical equipment.

The real goal was simpler.

I want to go somewhere.

Park.

And stop thinking about electricity.

That's it.

I want the technology to disappear into the background.

I want to worry about whether the pub kitchen is still serving food.

Whether the sunrise will be worth getting the drone up for.

Whether my next e-bike route is going to involve an unexpectedly enormous hill.

Whether I've remembered the coffee.

Not whether the heater has used another 8Ah.

But somehow that undersells it.

What I have really bought is the missing bridge between two previously separate energy systems.

Fogstar on one side.

Jackery on the other.

And sitting between them:

A little blue Victron box capable of moving 25 amps.

Quietly.

Efficiently.

Without drama.

Which is slightly ironic, because the result is probably the most elaborate electrical arrangement I have ever had in a campervan.

Vanilla now carries solar generation, alternator charging, mains charging, lithium storage, portable lithium reserve, Bluetooth monitoring and roughly 5kWh of combined stored energy.

All so I can sit in a pub car park in November with the heating on.

Perfect.

Absolutely perfect. 😂🧡

How much energy leaves the Jackery?

How much reaches the Fogstar?

How much disappears as heat?

How fast can the 25A Blue Smart really replenish Vanilla?

And, most importantly...

Can I finally get through an entire winter night without checking VictronConnect at 3am?

We are going to find out.