Budget T5 conversion — £500 electrical system

Right, thought I'd share what I've managed on a proper shoestring budget. Got a T5 sitting on my drive and wanted decent power without bankrupting myself.

The Setup:

• 400W of rigid panels (two 200W Renogy units bolted to the roof) — cheap as chips and zero moving parts to fail
• 100Ah LiFePO4 (Fogstar, local supplier so decent support)
• Victron SmartSolar 100/50 MPPT — honestly this is where I splashed out because the rest depends on it working properly
• 3000W pure sine inverter (no-name Chinese unit, £180 on eBay — seems fine so far)
• 100A busbar setup, proper cabling, all the safety bits

Why these choices:

Rigid panels are a fraction of the cost of flexible ones and handle the British weather without degrading. LiFePO4 was the only sensible battery tech at this budget — lead would've cost the earth long-term. The Victron MPPT is the heart of it all; cheap charge controllers just leave power on the table.

Reality check:

It'll run basics easily — fridge, lights, USB charging, laptop work. Won't smash through 3kW constantly but that's not the point. Winter output is predictably rough (isn't it always?) but I'm not living off-grid, just supplementing.

Total came to just under £500 if you're patient sourcing secondhand panels. Takes about an hour to add 2kWh on a decent day, which is plenty for van life or occasional off-grid stints.

Anyone else run minimal systems? Keen to hear how others stretch the budget.

Solid approach for the budget end. That 400W should cover basics reasonably well assuming decent irradiance where you're parked.

Few things worth considering:

Battery capacity — what's your actual Ah figure? 400W panels into even a modest 100Ah LiFePO4 will struggle in winter, and you'll find yourself cycling hard. If you've gone lead-acid to hit that £500 target, monitor voltage drop closely.

Charge controller specs — MPPT vs PWM makes a real difference with smaller arrays. A basic PWM might cost less but you're leaving 20-30% performance on the table, which stings on a tight system.

Inverter load — what's your actual draw like? Kettle, laptop, heating? Van electrics get genuinely temperamental when you're undersized here.

The rigid panels are a good call over flexible ones for longevity, though they're heavier. Just ensure your roof can handle the distributed load properly.

What controller and battery combo have you actually gone with?

That's a cracking budget build. 400W rigid panels are underrated for vans—decent angle and no faffing with tilt brackets.

What's your battery capacity? That's usually where the compromise bites at this price point. If you've gone lithium I'd be genuinely impressed on £500 total, but a decent LiFePO₄ 100Ah module alone pushes past that now.

The real win with a T5 is the roof space. Mine's similar length and I managed to squeeze 600W without it looking mad. Might be worth revisiting if you find yourself short come winter.

What MPPT controller did you land on? The cheaper Victron or Renogy units work fine but the cheap Chinese clones sometimes underperform in cloudy weather.

Mate, I've got to ask — how are you handling the charging profile on that setup? I'm running something similar in my boat (though I've had to be ruthless about panel placement with the mast in the way) and found that without proper MPPT you're leaving serious money on the table.

What controller are you using? If it's just a basic PWM

Absolute madness getting that lot for £500 — either you've found a goldmine of ex-demo kit or you're running on hopes and prayers. The rigid panels are the real MVP here though, no wobbly brackets to rattle your fillings out on every pothole. Just pray you've got south-facing roof space and aren't living under a permanent cloud (hello, UK winter). What's your battery capacity looking like? Because 400W feeding a knackered leisure battery is like trying to fill a bath with a garden hose when someone's left the plug out.

Rigid panels are brilliant until you realise you've mounted them at the angle of a Cornish cliff and your van's permanently aimed at Belgium—speaking from experience in my shepherd's hut where I can at least rotate the whole thing. That said, £500 for a full system is genuinely impressive unless the battery's one of those "definitely not reclaimed" leisure units from a car boot sale. What's the actual capacity and charge controller setup? Knowing offgrid4less, someone's already spotted if you're running Renogy into a proper MPPT or just hoping a PWM charges things before winter.

Fair play on the budget squeeze — T5s are perfect for this sort of thing. What's your battery setup looking like? That's usually where people either save a fortune or get caught out.

Rigid panels are solid if you've got decent roof space and don't mind the weight. The angle thing @Renogy_Nerd mentions is real though — even a few degrees makes a difference on a van where you can't reposition them seasonally like us garden office lot can.

400W should handle basic 12V loads without drama. Just make sure your charge controller's sized properly or you'll be leaving energy on the table. MPPT's worth the extra quid if you've got the headroom in the budget.

Keen to see how it performs once you've got some proper usage under your belt.

Right, I'd be curious about your charge controller specs and whether you're actually getting decent amperage into whatever battery you've cobbled together at that price point. 400W sounds decent on paper but it depends entirely on your controller's MPPT efficiency and how you've wired the panels.

With a T5, you're probably looking at fairly modest consumption if you're not running heating or a compressor fridge. The real bottleneck on budget builds is always the battery—cheap leisure batteries will leave you frustrated within a season. If you've genuinely done this for £500 total, I'd want to know whether that includes the battery or if you're running a smaller setup there.

Also worth mentioning: rigid panels on a van need proper venting underneath or you'll cook the backsheet in summer. Learnt that the hard way.

Ha, @Renogy_Nerd's got a point about the angle — I've seen some crackers mounted like they're trying to signal the ISS.

Real talk though, £500 for a T5 system is decent graft. Question is whether you've left headroom for upgrades? Most people realise after month two they've undersized the battery

Mate, £500 for a T5 electrical system is genuinely impressive — though I'm assuming that's before the inevitable "just one more thing" shopping spree that catches us all. The real question is whether those panels are actually getting sunlight or just giving your van a modern art aesthetic. Rigid mounting's brilliant until you realise you've optimised for August and the rest of the year you're getting sod all. What's your battery capacity looking like? That's where the budget usually explodes — can't run much off a couple of leisure batteries without careful power management, especially if you're thinking EV charging down the line (which would be mental, admittedly).

Decent effort on the budget, mate. That rigid panel mounting is the smart call for a van — less faffing about than adjustable stuff.

Only thing I'd clock is what charge controller you've gone with? MPPT vs PWM makes a proper difference at that wattage, and you can grab a decent Victron 75/15 or Renogy MPPT for not much more than a basic PWM. Especially in UK winter when you're fighting poor angles anyway.

Also curious about your battery setup — lithium or lead? Changes the whole equation cost-wise but affects how you'd actually use the system day-to-day in a van.

Crikey, £500 for a T5 system is a proper feat — that's basically one decent Victron MPPT and a prayer! Rigid panels are the way to go though, saves you from becoming a sun-chasing obsessive like some folk round here. Just make sure you've got decent ventilation round those batteries or you'll have a sauna situation come summer. What's your actual load looking like — just essentials or are you trying to run a kettle and hair dryer simultaneously? Because I learned the hard way in my motorhome that "budget" and "realistic" don't always share the same postcode!

£500? You've either found some dodgy warehouse stock or you're running on fumes and optimism — possibly both, which I respect immensely.

Real talk though: what's the actual battery capacity hiding in there? Because 400W of panels into a modest leisure battery is like filling a teacup with a fire hose. The MPPT controller (assuming it's a proper one and not a PWM unit masquerading as smart) will throttle the lot anyway.

I've got similar rigid setup on my static caravan — zero moving parts, they just sit there being reliable. But I learned the hard way that panel wattage means bugger all if your battery can't absorb it or your loads can't use it.

Post the battery specs and what you're actually powering. That'll tell us whether this is genuinely clever or just very enthusiastic. Either way, respectable effort on the budget — most people spend that on a single Victron component and call it a day.

Curious about your battery setup — did you stretch to LiFePO4 or gone traditional lead? At £500 total I'm wondering where the compromises are sitting.

I'm looking at something similar for my static caravan and trying to figure if it's worth hunting for ex-display Victron gear versus going budget Chinese MPPT. The rigid panel route makes sense, but I'm concerned about whether you're getting decent charge rates in winter with just 400W on a cloudy day.

Also — how are you managing DC distribution? Just basic breakers or have you got proper busbar setup? I've seen some folk cut corners there and it worries me more than undersizing capacity, if I'm honest.

Proper impressive on the budget front, @DorsetSolar. The maths only works if you've either scored panels secondhand or gone with a basic PWM controller rather than MPPT—which honestly isn't the worst shout for 400W if your voltage spread is manageable.

Where you've likely made gains is on the battery side. Reckon you're running lead-acid given the constraints? LiFePO4 would double your budget immediately. Lead's not elegant, but it'll shift electrons reliably enough if you're not planning deep daily cycles.

Real question though: what's your actual consumption profile? A T5 sitting idle draws minimal parasitic loss, so if you're just running leisure fridge, lighting, and occasional phone charging, 400W could legitimately get you through shoulder months. Summer's your friend here.

One thing worth auditing—what's your controller spec? A basic PWM unit loses roughly 15-20% efficiency compared to MPPT, but at this budget you're probably already accepting that trade-off. If you've somehow squeezed a Victron SmartSolar 100/30 in there,