[01] Installations, Alder Valley
Solar roofs, fitted by the people who sign them off.
Ruth Calloway designs every system and Tomás Ibarra’s crew fits it. More than 600 roofs since 2011.
Oct 2026 | Now booking November roof assessments in Halden and Ashby
[02] Roofwork
We design, permit, fit and look after rooftop solar in the Alder Valley.
Taiyo Solar Works is a small company with a workshop on Foundry Lane in Marlow. Ruth Calloway, an electrical engineer, designs every system and files the permits. Tomás Ibarra, a roofer by trade, runs the installs, and the people on your roof are the people who work for us, not a rotating crew of subcontractors.
We work within about sixty miles of Marlow: Kenning, Ashby, Halden, Pell Harbor and Westbrook. We say what a roof can and cannot do, give estimates with their assumptions written down, and come back after the install to check that the numbers made sense.
2011 founded in Marlow600+ roofs since 201115-year workmanship warranty
System size
8.8 kW
+ 13.5 kWh battery
Yearly output (est.)
11,000 kWh
≈ $2,150 a year saved (est.)
[03] Featured installation
A gabled roof in Kenning, with a battery for the evenings.
The Kenning house has a south-facing slope with almost no shade, and a family that cooks and charges the car after six. We fitted 8.8 kW on that slope in 2025 and added a 13.5 kWh battery in the garage so the afternoon surplus carries into the evening.
The figures above are modelled estimates, not a promise: they use the system’s expected yield and a $0.20/kWh household rate. We visit after the first year to compare them with the meter.
[04] Installations
Recent roofs, with the numbers beside them.
Estimates use the system’s modelled yield and a $0.20/kWh household rate. Your bill depends on your tariff, usage and weather. We do not guarantee savings.
[05] Services
What we install, and what it costs to start.
Residential solar
Roof-mounted systems from 4 to 10 kW, designed, permitted and fitted by our own crew.
from $11,800
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Batteries
A 13.5 kWh battery added to a new array or an existing one.
from $10,900
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EV charging
A Level 2 charger installed on its own circuit, with the load checked first.
from $1,450
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Commercial roofs
Flat and pitched roofs, 25 to 150 kW, quoted per site.
$2.10–$2.60 / W
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Maintenance
An annual visit: inspection, cleaning if needed, a written report.
$190 / visit
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Prices are installed, before any incentive. You may be eligible for one; we check this during the assessment.
[06] Free roof assessment
A free roof assessment, then a written proposal.
Nobody needs to commit to anything to have us look at the roof. Sofia Reyes or Marcus Bell will come out, measure the slopes, check the shading and the fuse board, and then we put the result in writing: what we would fit, where, for how much, and what output and saving to expect, with the assumptions written down.
1
Book
Phone, email or the form; we reply within one working day.
2
Visit
45 minutes on site: roof condition, pitch, shading, meter and fuse board.
3
Proposal
Written within 5 working days: system size, layout, price, est. output and saving.
4
Install
Usually 1–3 days on the roof; switch-on after inspection, typically 4–8 weeks from yes.
[07] The crew
The people who will be on your roof.
Every job has a named lead, two people on the roof at all times, harnesses and edge protection set up before the first panel is lifted. The founders still go on site: Ruth checks every layout before it is signed off, and Tomás walks every finished roof.
Marcus Bell
Lead installer, pitched roofs and racking
14 years on roofs
Priya Natarajan
Licensed electrician, batteries and EV chargers
9 years
Jonah Kessler
Commercial and flat-roof systems
11 years
Sofia Reyes
Roof assessments and system layout
7 years
[08] Journal
Field notes
[09] Free roof assessment
Ask us to look at your roof.
We serve Marlow, Kenning, Ashby, Halden, Pell Harbor and Westbrook. Weekday visits from 7:30 to 17:00; Saturday assessments, 9:00 to 13:00, by appointment.
