DJI Power 2000 Motorhome Installation

This Was Never the Plan

DJI Power 2000 motorhome installation was not on the vision board. There was no spreadsheet. No grand redesign. This started because I was growing tired of the two AGM batteries under the sofa and realised I’d essentially been carrying around two small gym memberships disguised as “leisure batteries.”

I didn’t think weight was an issue until I physically lifted them. I’m 54 years old, kneeling on a workshop mat, ribs pressed into plywood, knees filing a formal complaint, trying to shift what felt like industrial ballast from a tug boat. When did batteries get this heavy? And when did I get this fragile?

But the real issue wasn’t weight. It was anxiety.

If I woke up to 60 percent on the old system, I’d have celebrated like we’d won the lottery. Sixty would have been luxury. We were waking up in the red. Proper red band graphics at 30 percent. Sometimes lower. Sometimes before we’d even gone to bed. There’s nothing quite like brushing your teeth while silently calculating whether the water pump is about to tap out.

And then, just to spice things up, I nearly set the van on fire.

The Day the Cable Tried to Kill Me

I’d upgraded the inverter feed cable. Or so I thought. 50 AWG looked substantial. It felt substantial. It was not substantial.

Driving along, charging Kathy’s laptop, feeling smug about life off-grid… and the cable starts getting hot. Not warm. Not “hmm that’s odd.” Hot. Melt-the-insulation hot.

There are moments in life where you reassess your decisions. Watching a power cable attempt spontaneous combustion inside your motorhome is one of them.

Buying a 70 AWG replacement was the turning point. I was spending money trying to make a system behave that fundamentally didn’t want to behave. Meanwhile, under the table sat the DJI Power 2000. A lithium unit we’d bought months earlier because the Jackery had started crying every time Kathy plugged in her old laptop. That laptop doesn’t charge. It extracts electricity like it’s revenge.

And when you live in a van, you are the national grid.

So the obvious question became: why am I not running the van off the smart lithium unit I already own?

The Big Red Box of Magic

The motorhome has a power distribution unit that is no longer in production, the Calira EVS 38/20 Fuseboard with Integrated Charger. It works beautifully. It also looks like something you absolutely should not interfere with unless you enjoy sparks.

I call it the Big Red Box of Magic (BRBOM).

It trickle-charges the starter battery on shore power. It feeds the leisure batteries when the alternator wakes up. It clicks with authority. It does things automatically that I do not understand.

The alternator in this van is dumb in the nicest possible way. It produces electricity with enthusiasm and zero emotional intelligence. The BRBOM makes it look clever.

The internet will tell you that fitting lithium into an older van means fitting a DC to DC charger and probably upgrading half your wiring. I have neither. What I do have is money to buy DJI’s 1kW Super Fast Car Charger and a stubborn refusal to give Victron all my money.

The £130 Dream That Became £300 Reality

In my head this was a £130 solution. A couple of adapters. A bit of clever wiring. Done by teatime.

Instead, I bought the wrong SDC to XT60 cable. Then I discovered the fast charge cable only works if you actually own the 1kW Super Fast Car Charger. Which I didn’t. So now I did.

Refunds were processed. Parcels were returned. Amazon gently allowed me to spread the financial embarrassment of buying the 1KW fast Car Charger over six months.

Then I added DJI’s MPPT unit because I was tired of my solar input being measured in amps like it’s 1997. I have 400 watts on the roof. Tell me what they’re doing. Do not make me divide anything while standing in snow.

By this point I was committed.

The Night I Sat in the Dark

Thursday night. Cushions stacked in the cab. Screws everywhere. Cable ties sacrificed. Studio lights rigged because I knew there would be a point where I’d disconnect the system and instantly regret it.

There was one red cable with a 30 amp fuse that looked important. I had no idea what it did. Which is always comforting.

I removed the AGMs. Wired in the 1kW charger. Plugged it into the DJI Power 2000’s SDC port. Switched it on. AC sockets worked. I allowed myself a tiny internal celebration.

The 12V system did absolutely nothing.

I sat there in the dark, wondering how quickly two AGM batteries could be reinstalled if I pretended this never happened.

Out of curiosity more than confidence, I tapped that mystery red lead onto the starter battery cable.

The lights came on.

I removed it.

The lights stayed on.

And that’s when it clicked.

The Moment It All Made Sense

The 1kW Fast Charger works both ways.

It can pull power from the alternator into the DJI when driving. But it can also push power back to maintain the starter battery when stationary. Which means the van’s existing 12V logic still works. The Big Red Box of Magic doesn’t need rewriting. It just needs stable voltage to believe everything is normal.

Instead of bypassing the system, I fed it smarter power.

The next day we drove to Coleraine to sort out the cracked fireplace glass from our house. I barely spoke. My brain was running voltage scenarios. Mrs M gently pointed out I’d gone quiet, which is her way of saying, “You’ve entered electrical monk mode.”

Somewhere during that drive, it all simplified. Stop fighting it. Let the starter battery be the gateway. Let the fast charger manage voltage.

Sometimes the solution isn’t more complicated wiring. It’s understanding what’s already there.

First Night Without Battery Anxiety

We’re parked at Springwell Forest Park. It’s snowing. The dogs are flat out on the floor. Billie Eilish is playing quietly through the speakers. The twinkly lights are on. The heating is doing its thing.

Four hours in and the DJI is sitting at 89%.

On the old system we would have been in the red already. Proper red. I’d be glancing at the monitor every seven minutes like a nervous day trader.

Instead, the starter battery is at 12.7V. The fast charger is gently maintaining it at around 15W. The interior is warm. The world outside is white.

For the first time in a long time, I’m not thinking about power.

I’m just here. Still.

The Bits That Annoy Me

It’s not perfect.

There’s no cigarette lighter-style 12V socket on the DJI. SDC ports are limited (x2). Recharing devices eat them. XT60 connectors are fine but they too only work off the SDC ports.

Right now the old Jackery Explorer 1000 is under the sofa, sharing space with what was meant to be its replacement, powering the Starlink because the cable is about ten inches too short to reach the high-capacity USB-C port. Yes, I had to order an extension cable. Yes, this is mildly embarrassing.

I also had to isolate the shore power so the DJI doesn’t try to charge itself while running AC. That involved a connector block I’m not proud of that either. I even bought a block cover from B&Q, but I didn’t use it. This has not been plug-and-play. It has been think, swear, reorder, rethink.

Would I Do It Again?

Absolutely!

Not because it was easy. It wasn’t. Not because it was cheap. It wasn’t exactly that either.

But because I installed modern lithium into a motorhome that predates lithium being mainstream, without fitting a DC to DC charger, without upgrading the alternator, and without rebuilding the van from scratch.

Everything sits inside DJI’s smart ecosystem. It monitors. It protects. It manages voltage in both directions. For someone who already owned the unit, this made more sense than ripping everything out and going full Victron.

Most importantly, I’ve stopped waking up in winter wondering whether the van will survive until morning.

And honestly, that’s worth more than amp hours.

https://youtu.be/YTEpHxzr0NY