In the Cornwall countryside, a stone farmhouse built in the 19th century is home to James and Emily and their three children. The property was originally the dwelling of a small dairy farm; today, James runs a boutique cheese-making workshop here, while Emily looks after the children and manages the farm's online sales. Like many rural British families, they faced a double burden: the farm's electricity costs were climbing steeply, and the reliability of the rural grid was, to put it mildly, unreliable. They decided to bid farewell to the roar of their diesel generator once and for all, and instead transform this ancient farmhouse into a modern, clean, energy-independent "micro power plant" with a complete solar-plus-storage system.

James's cheese workshop requires constant-temperature maturation rooms, refrigerated display cabinets, mixing equipment, and packaging machines - most of which run for hours on end. Add to that the daily electricity demand of a four-bedroom home - water pumps, water heaters, fridge, washing machine, and the electronic devices of three children - and the family's electricity bill was never a small line item.

"I ran the numbers," says James. "Between the cheese workshop and the house, we were buying about 900kWh from the grid every month on average. At current prices, that's roughly £260 a month - over £3,000 a year. For a small family operation, that's no small expense."

Even more frustrating were the power outages. Cornwall's rural grid is notoriously fragile - winter storms frequently bring down power lines, sometimes for five or six hours at a time. In the autumn of 2024, a gale toppled an old oak tree at the farm gate, which brought down the power lines. The entire farm was without electricity for nine hours. The temperature in the cheese maturation room fluctuated by nearly 3°C, and James feared that the batch of Cheddar destined for market might be ruined. Though it survived, that experience was the final straw - he decided something had to change.

James already had a diesel generator as backup, but every outage meant dragging it out of the tool shed, refuelling, pull-starting - and dealing with the noise, black smoke, and regular maintenance. "Every litre of diesel hurts," he said. "Not just because it's expensive, but because I have all that roof space for solar panels - why should I be burning fuel?"

James began researching home storage solutions, but quickly found that most all-in-one systems, while appearing "hassle-free," were essentially "black boxes that lock you in."

"My situation is a bit special," says James. "I'm not just looking for a backup battery for the house. I have a cheese workshop running, with lots of refrigeration equipment and temperature-controlled maturation rooms - these loads have very different usage patterns from a typical home. I need a system that lets me set my own strategies, adjust as I go, and see exactly where every kilowatt-hour goes."

Then he came across a post from another smallholder who had built a custom storage system using Victron Energy equipment. The post highlighted modular design, remote monitoring, and third-party battery compatibility. James was immediately intrigued.

"Victron's modular design means I can start with one inverter and one battery, then scale up," says James. "And Wysher's Auran 48100ESS R batteries support both CAN and RS485 communication, integrating perfectly with Victron's Cerbo GX controller - which gives me full system monitoring and intelligent management. Best of all, this system is open and transparent - I can configure it exactly the way I want."

The Final System Configuration

After multiple consultations with a system designer - factoring in the cheese workshop's electricity needs and the household's daily loads - James finalised a "start with 15.36kWh, with plenty of room to expand" setup:

(Note: The above reflects James's actual farm setup. The Wysher Auran 48100ESS R supports modular parallel connection for future expansion. The two MultiPlus units in parallel not only provide higher power output but also deliver redundancy - even if one fails, the other can keep critical loads running.)

The biggest challenge of the installation wasn't the equipment itself - it was the 19th-century stone farmhouse. The walls are thick local granite with no load-bearing issues, but routing the cables was a major undertaking. The installation team spent two days safely bringing the DC cabling from the roof into the barn equipment room.

The 24 × 455W panels were installed on the south-facing pitched roof of the main barn - the best-lit spot on the entire farm. Every 12 panels are wired in series into two strings, feeding the two SmartSolar MPPT 250/100 charge controllers respectively. Peak PV power: 10.92kWp - on a summer's day in Cornwall, this array can generate over 50kWh.

The three Wysher Auran 48100ESS R batteries were installed in the equipment room on the ground floor of the barn - right next to the cheese workshop for efficient nearby power delivery. Each unit measures 442×440×133.5mm and weighs 41.5kg; the three are mounted side-by-side on a dedicated rack, occupying about 1.5m² of wall space. The parallel connection between batteries uses dedicated communication and power cables - CAN-bus synchronises the BMS data from all three to the Cerbo GX controller.

The two Victron MultiPlus 48/5000 units are mounted on the distribution board next to the batteries - one as master, one as slave, running in parallel synchronisation via VE.Bus cables. Their AC inputs connect to the farm's main consumer unit through a dedicated 100A breaker; the AC output is split into two circuits: one feeding the "cheese workshop critical loads sub-panel" (maturation room, refrigerated display cabinets, mixing equipment), and the other feeding the "household critical loads sub-panel" (fridge, freezer, router, security cameras, water pump). This means that even during a complete grid outage, the workshop's core production and the family's basic living needs remain uninterrupted.

James also installed a GX Touch 70 screen on the wall of the cheese workshop - though he mostly checks data via the VRM app on his phone, glancing up at the live numbers has become a daily habit. "First thing every morning when I walk into the workshop, I look at how much battery is left and how much solar we're expecting today," James laughs. "It's more punctual than my coffee machine."

One evening in November 2025, a winter storm hit Cornwall. Strong winds brought down a power pole near the farm, cutting power to the entire area. The outage happened at 8 p.m. - right after dinner, just as the children were getting ready for their baths.

The system instantly switched to island mode the moment the grid went down. The maturation room's temperature control was unaffected - the fluctuation was less than 0.5°C. The refrigerated display cabinets ran normally, with no cheese loss. The lights didn't flicker, the router kept working, and the children didn't even notice the outage - until James told them the next morning: "Did you know we had a power cut last night?"

The outage lasted nearly 14 hours - from 8 p.m. to 10 a.m. the following day. The three Wysher batteries discharged from 100% to about 35%, still holding over 5kWh of reserve. When the grid was restored the next morning, the system automatically reconnected and began recharging the batteries from the grid - all without any manual intervention.

"Before, every outage meant I'd have to get up in the middle of the night to start the generator," says James. "Now, I slept soundly, checked VRM in the morning, and saw the batteries were at 35% with solar already generating. That feeling is hard to put into words."

From an ancient farm reliant on an expensive grid and a noisy diesel generator, to a modern family workshop powered by solar generation and battery storage - James's story isn't unique. Across Cornwall, thousands of rural families and small agricultural operators face the same challenges: remote locations, unstable grids, and high energy costs.

What sets this story apart is that they chose a different path from the mainstream all-in-one solutions - using modular Wysher batteries and Victron equipment to build a home and farm energy system that truly belongs to them, one that can keep evolving and that they can fully control.