// Solar & BESS sizing & quotation
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Step 1 of 4 — Project
🌍Market / Country
Sets currency, tariff/VAT defaults, and grid-tie assumptions for this design. Regulatory content is advisory only — always verify locally.
If set, key totals also show an approximate USD equivalent.
🏗️Project Information
⚙️Design Parameters
days
Days of battery backup without solar input
%
LFP: 80-90%. GEL: 50%
%
%
%
Accounts for heat, soiling, mismatch losses
%
Additional capacity reserved for future loads
💡Electricity Tariff Configuration
Set the electricity rate used to calculate annual savings and payback period.
Flat Rate (single tariff)
Graduated / Block Tariff
KES
Check your electricity bill. If you have a graduated/block tariff, switch to "Graduated" above.
%/yr
Historical electricity price inflation, used in the payback projection.
💹Commercial & Investment Parameters
%
Used to discount future savings in the payback/NPV projection. Typical: 8–15%.
%
Annual operation & maintenance as % of installed system cost.
%
If you're an installer preparing this quote for a client, add your own margin to cover your installation/service cost. Leave at 0% if this is for your own home or business — Nextritech's report fee is separate and unaffected by this field.
%
🔌Appliance Load Inventory
Enter all appliances and their operating hours per day. Critical loads (inverter-backed) must run during outages. Non-critical loads can shed during outages.
| Appliance | Phase | Watts | Qty | Hrs/Day | Critical | kWh/Day |
|---|
🔋Battery Bank Preference
Based on your load profile above, the engine will size the battery bank. Select your preferred unit size and chemistry below — or leave on Auto to let the engine pick the most cost-efficient option.
days
Days of backup without solar. Updates Design Parameters automatically.
🤖 Auto-SelectOptimised
Engine picks the most cost-efficient unit for your load profile
2.56 kWh25.6V / 100Ah
Small residential · 24V systems
—
5.12 kWh51.2V / 100Ah
Standard residential · 48V · Most common
—
10.24 kWh51.2V / 200Ah
Medium residential / SME · 48V
—
15.36 kWh51.2V / 300Ah
Commercial · 48V rack
—
20.48 kWh51.2V / 400Ah
Large commercial · 48V
—
100 kWhContainerised C&I
Industrial / C&I
—
Estimated bank (energy basis only — final sizing in engine):
Set your loads above to see an estimate
🎯Sizing Basis — Today or Future Load?
Each component can be designed for today's actual load or the future projected load. Today = lower cost, more competitive quote. Future = more headroom.
☀️ Solar PV Array
Always kept at today's load + 8% contingency. Future sizing not recommended for PV.
⚡ Inverter
Today: sizes on current peak demand. Future: adds a growth buffer.
🔋 Battery Bank
Today: most competitive quote. Future: larger bank, higher cost.
🔌System Mode
Solar Hybrid
Solar + Battery + Grid. All three designed.
Off-Grid
Solar + Battery only. No grid connection.
Grid-Tied
Solar + Grid, no battery. Export/import.
Solar Only
No battery, no grid — common for water pumping.
BESS Only
Battery storage, grid-charged. No solar. Pure backup/UPS.
📈Load Planning & Growth
%
% of the full load list running simultaneously — sizes the inverter only.
%/yr
yrs
kWh/day
☀️Solar Resource & Site Data
hrs/day
Kenya average: 5.0–6.5 hrs.
°
Approx. site latitude.
🏠Roof / Installation Area
m²
Determines the mounting/fixing system in the BOQ.
🌡️Environmental & Grid Data
°C
Affects panel output derating.
m
Auto-set from the selected market and phase.
🔋Component Preferences
🤖 Auto-Select (Best Value)
✏ Other (enter below)
Auto-Select picks a standard 540W panel by default. Enter an exact wattage if you know what's available in your market.
⚡ Auto (Engine decides)
48V (Recommended ≥3kW)
24V (Small systems ≤5kW)
48V systems carry more power at lower current — less cable loss, more efficient. 24V is lower cost for small systems.
🤖 Auto-Select (Optimised)
✏ Custom
Auto-Select optimises for the required capacity. Override here if you have a specific product in mind.
🤖 Auto-Optimise (Recommended)
Single Inverter
Parallel Inverters
Premium (top-tier brands)
Mid-Range
Budget-Friendly
KES
🛡️Protection & Monitoring Requirements
Tap to toggle what's included in the design.
📏Cable Run Lengths
Enter actual one-way cable run distances if known. Leave blank to use estimates.
m
m
m
m
°C
Coldest expected dawn temp.
%
Who is this quotation for?
The report is addressed to this name — leave the box checked if you're buying this for yourself.
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Exact PV, inverter & battery sizing for your site
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