Solar pSEO Landing

UK Winter 48V Off-Grid Solar Calculator P3

Profile 3: size battery Ah and panel watts for UK Winter conditions at 48V using 2.3 peak sun hours and 2-day backup.

Sizing Snapshot

Daily Energy

2780 Wh

Battery Bank

139.9 Ah

Solar Array

1649 W

Inverter Baseline

375 W

Appliance	Power	Daily Runtime	Wh/Day
Fridge (60W x 24h)	60 W	24.00 h	1440 Wh
Starlink (75W x 8h)	75 W	8.00 h	600 Wh
Laptop (90W x 6h)	90 W	6.00 h	540 Wh
LED Lights (40W x 5h)	40 W	5.00 h	200 Wh

Low winter sun window requiring larger battery and panel overhead.

Use local monthly irradiance data to tune peak-sun-hour assumptions before procurement.

Cloud-prone months usually benefit from higher autonomy targets and larger reserve buffers.

For winter-heavy climates, panel overbuild is often cheaper than repeated battery deep cycles.

Yes, the model applies chemistry-specific assumptions for DoD and charging to keep estimates closer to practical planning ranges.

Use this for planning and shortlist decisions, then validate with measured appliance duty cycles and local irradiance history.

For this load profile, estimated LIFEPO4 bank sizing is 139.9 Ah at 48V with 2-day autonomy.

The calculator estimates 1649 W panel capacity after charge and derate factors.