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Cottage power

Solar kits for cottages and chalets that match your loads.

List the appliances, daily energy, starting loads, season, and autonomy target before choosing panels or batteries.

See the buildsSize mine first

Direct answer

A weekend cottage using 2.5 kWh per day needs about 880 W of panel, a 60 A MPPT controller, and roughly 5.6 kWh of lithium storage for two days of autonomy. That is the Recommended build below.

Before the hardware

Collect these four inputs.

  1. 01Daily energy use
  2. 02Starting loads
  3. 03Winter access
  4. 04Required autonomy

Worked example

Weekend cottage reference case

Assumptions

  1. 2,500 Wh of energy used each day
  2. 4.0 peak sun hours and a 0.78 system derate
  3. Two autonomy days at 90% usable lithium depth
  4. 24 V battery bank

Calculation

  1. 2,500 ÷ (4.0 × 0.78) = about 800 W of array
  2. Two PH440BI panels provide 880 W
  3. 880 ÷ 24 × 1.25 = about 46 A, so use a 60 A controller
  4. 2,500 × 2 ÷ 0.90 = about 5,600 Wh of storage

Result:880 W of panel, a 60 A MPPT controller, and a 24 V lithium bank near 5.6 kWh.

Sources and assumptions (2)
  • Enerwav sizing rules reviewed on 2026-07-22.
  • Product records and specifications are checked again at quote.
Read the full method

Build tiers

Compare the hardware and see what still needs checking.

No price is public. Every item uses Dixon web price times 1.0 as the internal basis and must be repriced before publication.

Base

A DC-first seasonal build. The battery bank and small inverter remain supplied on quote.

Request priceRepricing required
Base included items
QtyProductKey specNote
1PH440BI panelPH440BI440 WCatalog item
1ML2440 controllerML244040 ACatalog item
1AGM bank selectionCapacity from load sheetSupplied only after model and series check
A wiring diagram PDF is included after protection, cable, and compatibility checks.
Held by a missing input or partRequest this build

What makes it work

Three choices that need to be checked together.

Panel choice

Array watts come from daily energy and seasonal sun, not roof size alone.

View the category

Controller headroom

Array watts divided by bank voltage, then multiplied by 1.25, sets the minimum current.

View the category

Battery chemistry

Usable depth, winter temperature, charge settings, and BMS current all matter.

View the category

Help around the hardware

A product record does not replace a system review.

Free

Free sizing review

A load worksheet review with the assumptions, missing inputs, and a hardware direction.

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Quoted

Custom battery bank assembly

Series or parallel configuration with cables cut, crimped, and labelled after compatibility review.

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Keep checking

The method and terms used here.

Read the sizing method

See the assumptions, suppression rules, and evidence standard used here.

Read the guide

Check the energy glossary

Confirm the meaning of capacity, energy, current, and autonomy.

Read the guide

Honest limits

Know before you buy

  • The listed inverter provides 120 VAC only. It does not serve a 240 V well pump.
  • The BB250 busbar is excluded until its 24 V or higher rating is confirmed.
  • Battery BMS continuous current and winter capacity must be checked before the kit is quoted.

Read the method and limits

Common questions

Short answers, limits included.

Can this run a 240 V well pump?

No. The listed reference inverter is 120 VAC only. A 240 V pump needs a different design.

Why use winter sun in a year-round cottage?

Use the season that must work. A summer-only array can be smaller than a winter-critical array.

Is 5.12 kWh exactly two days of storage?

No. The calculated target is about 5.6 kWh. The listed battery is a nearby catalog option and needs a load review.

Does the quote include a wiring diagram?

A wiring diagram is included after protection, cable, and compatibility checks are complete.