Solar PV sizing
Calculate what solar array size (kWp) and panel count you need to cover a chosen share of your annual electricity consumption.
Open calculatorPV kit configurator
Add catalogue products or custom items, set quantities and compare the estimated kit cost. Prices are indicative for Poland and are not a quote. For one panel model, one inverter and at most one battery, the calculator shows indicative electrical checks, including voltage at −25 °C. An installer must verify the design.
PV module
1 item
Net unit price: 45.74 GBP/item
Mounting system
1 item
Net unit price: 42.22 GBP/module
Quantity from panels: 20 modules
Inverter
1 item
Net unit price: 1,090.77 GBP/item
Battery storage
1 item
Net unit price: 1,864.86 GBP/item
Accessories and protection
8 items
Initial quantities are illustrative. An installer must confirm the selection and quantities of protection devices, cables and optimizers.
Net unit price: 19.00 GBP/item
Net unit price: 41.80 GBP/item
Net unit price: 34.20 GBP/item
Net unit price: 1.05 GBP/m
Net unit price: 47.50 GBP/item
Net unit price: 19.00 GBP/item
Net unit price: 6.65 GBP/item
Net unit price: 3.80 GBP/item
Installation labour
1 item
Net unit price: 190.00 GBP/kWp
Quantity from panels: 9 kWp
Catalogue prices are manually entered estimates, not live shop offers. Accessory prices are illustrative net amounts; compare current offers before purchasing.
Catalogue prices are Polish market prices in PLN net, converted at the ECB reference rate of November 5, 2026 (1 PLN = 0.19 GBP). They are not local prices in your market.
Rate checked 2026-11-05. Source
Estimated gross cost
9,498.29 GBP
Net cost
9,498.29 GBP
VAT 0%
0.00 GBP
Gross cost per kWp
1,055.37 GBP/kWp
Array capacity
9 kWp
Total module area
40 m²
Nominal battery capacity
20.48 kWh
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What next with this result?
Passes 9 kWp and 49,989.80 PLN gross to the payback calculator. The numbers stay in this browser tab and are not added to the address.
The payback calculator works in PLN: the gross amount is converted at the ECB rate of November 5, 2026 (1 PLN = 0.19 GBP).
The kit’s battery sets self-consumption to about 54%.
Calculate payback timeCalculation report (A4 / PDF)
Live previewThis report contains your inputs. Printing and sharing are your choice; it was prepared locally.
Bill of materials estimate based on component list prices and selected VAT rate. Actual installation costs may vary depending on site conditions.
100% local in browser
rivermath.com · Prepared locally
This document is for informational purposes only and does not constitute a commercial offer or energy audit.
Your kit at a glance
Illustrative only; electrical connections are not shown. An installer must confirm accessory quantities.
20 panels
9 kWp1 inverter
1 × Deye SUN-10K-SG05LP3-EU-SM2
2 batteries
2 × Deye SE-G10.2 (51.2 V) · 10.24 kWh
Mounting
1 item · 20 modules
Installation
1 item · 9 kWp
Accessories and protection
- 12-module distribution enclosure1 item
- Type 2 DC surge protection device2 item
- Type 2 AC surge protection device1 item
- 6 mm² DC solar cable40 m
- Power optimizer20 item
- DC isolator switch2 item
- DC fuse holder4 item
- Pair of solar connectors4 item
| Component | Qty | Net cost (GBP) |
|---|---|---|
1.Jinko Solar Tiger Neo JKM450N-54HL4R-B · 450 W | 20 × 45.74 GBP | net: 914.80 GBP |
2.K2 Systems SolidRail / SingleRail, tiled roof | 20 × 42.22 GBP | net: 844.40 GBP |
3.Deye SUN-10K-SG05LP3-EU-SM2 | 1 × 1,090.77 GBP | net: 1,090.77 GBP |
4.Deye SE-G10.2 (51.2 V) · 10.24 kWh | 2 × 1,864.86 GBP | net: 3,729.72 GBP |
5.12-module distribution enclosure | 1 × 19.00 GBP | net: 19.00 GBP |
6.Type 2 DC surge protection device | 2 × 41.80 GBP | net: 83.60 GBP |
7.Type 2 AC surge protection device | 1 × 34.20 GBP | net: 34.20 GBP |
8.6 mm² DC solar cable | 40 × 1.05 GBP | net: 42.00 GBP |
9.Power optimizer | 20 × 47.50 GBP | net: 950.00 GBP |
10.DC isolator switch | 2 × 19.00 GBP | net: 38.00 GBP |
11.DC fuse holder | 4 × 6.65 GBP | net: 26.60 GBP |
12.Pair of solar connectors | 4 × 3.80 GBP | net: 15.20 GBP |
13.Standard installation | 9 × 190.00 GBP | net: 1,710.00 GBP |
What the sizing check covers
Electrical compatibility was not checked: optimizers or custom accessories need separate verification by an installer.
shading and roof planes, cable cross-sections and protection, roof load, DSO connection terms, current datasheets and device firmware
Checks rely on indicative datasheet values (STC, Voc temperature coefficient). They do not replace sizing by an installer or an electrical design.
This is an estimate, not a quote. It covers only the items added; an installer should verify the accessories and complete the quote.
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Educational estimate only. Not medical, tax, legal or financial advice.