Running a PC, monitors and router off solar

Been planning my garden office setup and want to go fully off-grid for the workspace. Currently looking at running:

• Desktop PC (gaming-capable, so decent power draw)
• Dual 27" monitors
• WiFi router + modem

My setup so far:

• 4.8kWp solar array (south-facing, decent angle)
• Victron Multiplus II 48/5000
• 15kWh LiFePO₄ battery bank (Fogstar cells)

The issue I'm hitting is peak winter performance. I can comfortably run this lot through summer, but come November-January the solar output drops significantly. Currently I'm supplementing with grid power during those months, which defeats the purpose somewhat.

Few questions:

1. Should I size purely for worst-case winter, or accept grid backup? Seems mad to oversize for three months of marginal sun.

2. Anyone actually running a gaming PC setup off solar year-round? What's your approach — do you restrict usage, dial back GPU performance, or just accept battery drain?

3. PC idle draw vs usage draw — the PC sits at maybe 150W idle but spikes to 400W+ gaming. Router's negligible at 15W. Worth getting a smart switch to cut the PC entirely during low-production days?

4. Monitor choice — are there power-efficient 27" options that don't compromise on image quality? Currently got some Dell IPS panels that are reasonably efficient.

Keen to hear how others have solved this without going full grid-tie.

Have you calculated your actual power draw? Gaming PCs can spike to 300-400W easily, and dual 27" monitors add another 80-120W depending on brightness and panel type. That's a serious inverter requirement.

I'm running a similar setup in my van conversion and found the real challenge isn't the solar generation—it's the battery bank needed to handle those loads during grey winter days. You'd be looking at a decent lithium setup (8-10kWh minimum) to avoid throttling your PC when clouds roll in.

What's your internet situation? If you're relying on a standard router, factor in backup power for that too. Nothing worse than losing connection mid-work because your solar dipped.

What size roof space are you working with for panels? That'll dictate whether this is genuinely feasible or whether you'd be better hybrid-ing it back to grid for stability.

Right, so you're looking at roughly 500W sustained if you're not actively gaming, then spikes to 700W+ when things get spicy – that's where most folks come unstuck. I've got my shepherd's hut office running a modest setup (single monitor, work PC) and even that taught me solar alone is a fantasy in winter.

You'll need serious battery capacity to bridge those peak hours. I'm talking 10kWh minimum if you want to game through an overcast afternoon without everything dropping to 1fps. A decent Victron inverter (Phoenix or similar) will handle the spikes, but the real expense is batteries – I'd budget for LiFePO₄, not lead-acid.

What's your actual solar capacity look like? That's where reality meets ambition.

You'll need to be realistic about battery sizing here. @FormerMariner1 and @CamperCarl have nailed the power requirements — the challenge is covering those spikes without massively oversizing your system.

I'd recommend logging actual consumption first. Use a Kill-A-Watt meter on your existing setup for a week. Gaming workloads are bursty, so you're not drawing 700W continuously, but your battery bank needs to handle those peaks without voltage sag killing your PC (especially annoying mid-render).

For a shepherd's hut setup I tested, I went Victron MultiPlus 3000 with 10kWh LiFePO₄ — overkill for office work, but the MPPT controller handles my solar variability. You'd likely get away with 5-6kWh if you're disciplined about not gaming during poor weather.

Router's trivial (15W constant), but dual 27" panels pull more than most assume — closer to 100W combined under load, not 80W.

Real question: can you shift gaming to evenings and accept cloud-day

The elephant in the room here is duty cycle. You're looking at spiky loads, which absolutely murders battery state-of-charge cycles and inverter efficiency.

What you actually need to establish is: how many hours daily are you under load? If it's 8 hours of solid work with occasional gaming, that's manageable. If it's 12 hours with frequent gaming sessions, you're heading toward a 15-20kWh battery bank just to get comfortable margins — and that gets expensive fast.

I'd suggest running the setup grid-connected initially, or at minimum having grid backup via a hybrid inverter (Victron Multiplus is the standard here). The reality is garden offices get used inconsistently — weather, seasonal daylight variation, unexpected high-load periods. Pure off-grid with gaming workloads is doable but you'll spend more on batteries than solar generation capacity.

As @FormerMariner1 noted, actually log your PC's draw under realistic conditions first. Gaming benchmarks mean nothing; your actual usage pattern is what matters. Once you've got that data, the battery sizing becomes straightforward. Without it, you're just guessing.

The spiky load issue that @LH_Marine's flagging is precisely why I ditched a straight lithium setup for my workshop. Gaming PC loads aren't linear — you get massive inrush when the GPU kicks in, and that can wreck your inverter's efficiency if you're undersized.

What's actually worked for me is hybrid approach: Victron Multiplus II handling the sustained stuff (router, monitors in idle), with a dedicated small lead-carbon bank for the PC peaks. Sounds daft, but the lead-carbon soaks those transients without cooking your lithium's management system.

You'll also want to honestly measure your actual gaming sessions. If it's couple hours daily, you can actually get away with smaller battery if you're willing to shift intensive workloads to grid hours or top up via solar midday. Most garden office folk massively overestimate their real sustained draw versus their peak fantasies.

One practical point: those 27" monitors are thirsty. Look at running them off separate 12V step-down rather than through your main inverter — saves conversion losses and keeps your DC side cleaner for sensitive gear.

What's

The spiky load thing is real, mate. I learned this the hard way with my setup—got a Victron MultiPlus doing the heavy lifting, and it's transformed how the system behaves during those CPU power surges.

What nobody mentions enough is that your gaming PC's PSU will have inrush current that can trash an undersized inverter. I'm running a 3kW unit and it still gets a bit twitchy when the rig boots. You might get away with smaller, but honestly, I'd budget for at least 2-3kW sine wave to keep everything happy.

The monitors are actually the least of your worries—that's steady draw. Router's negligible. It's the PC that'll dictate your battery requirements because of those spikes, not the average consumption.

If you're serious about this, I'd suggest working out your actual peak draw (look at the specs on your PSU) and running it past a Victron inverter calculator. Then size your battery as if you're covering winter days when the sun's barely showing up. That's where most people get caught out in the UK.

What's your current panel

The spiky load crowd are spot on, and I've been down this exact road with my motorhome setup. A gaming PC pulling 300-400W when you load a demanding game is a nightmare for battery management—that's not a steady drain, it's a spike that hammers your BMS.

Here's what actually worked for me: oversized battery bank relative to your inverter size. Sounds counterintuitive, but a larger LiFePO4 bank spreads that spike across more cells, keeping individual cell voltage stable and preventing the inverter from cutting out. I'm running 10kWh for what looks like a 3kWh job, and it's night and day.

Pair this with a quality pure sine inverter—your PC power supply will tolerate voltage sag far better with Victron or Fogstar gear than budget stuff. And be ruthless: can you game during peak solar hours? Can the monitors go to sleep mode?

The router's nothing—that's your freebie. It's the PC that'll make you regret this decision in winter if you don't plan properly.

What's your

The gaming PC spikes are the real killer here—you're looking at 400-500W+ when those GPUs wake up. I run a similar setup on my narrowboat and learned quickly that you need two things working together.

First, your battery chemistry matters less than your inverter spec. A Victron MultiPlus (or even the cheaper Fogstar equivalent) with proper AC coupling handles those spikes far better than you'd expect, even with modest lithium. The key is its ability to draw from mains/generator briefly during transients.

Second, stack your capacity. Don't just size for average draw—account for the peak and recovery time. A 48V 10kWh system handles a 500W spike differently than a 5kWh one, even if daily consumption is identical.

What's your actual budget range? If you're under £3k total I'd honestly suggest a smaller system with a petrol genset as backup rather than overspeccing batteries. If you've got breathing room, a hybrid setup (oversized panels + modest battery + grid fallback to router/charger) takes the edge off everything.

How

Gaming rigs are brutal for solar setups, mate. The PSU itself draws loads of phantom power even idle. I'd honestly suggest sizing your battery for the spikes—LiFePO4 handles them better than lead acid. Check your actual draw with a kill-a-watt first though, saves guessing. What's your battery capacity looking like currently?