VAN POWER BUILDER

Off-grid power, designed around your van.

Tell us how you travel and what you want to power. We’ll build an indicative SkyEnergi + SRNE system around your real-world usage.

Explore SRNE range

Planning tool only. The system recommendations and appliance power figures shown are estimates based on typical usage and are provided as a guide only. It is the customer's responsibility to confirm that all products are suitable for their vehicle, electrical system and intended use, and to check the actual power consumption and specifications of their appliances before making any purchase. Final cable sizes, fuse ratings, protection, compatibility and installation requirements must be confirmed for the specific vehicle and application. If in doubt, please consult a suitably qualified installer.

Build your SkyEnergi power system
Step 1 of 7

What are you building?

Vehicle size helps us make sensible recommendations around battery format, charging and available space.

How do you use the van?

This tells us how much battery reserve to build in between opportunities to recharge.

2 nights
We’ll use this as the storage target before any recharge is taken into account.

Build your daily power use

First tell us whether you want 230V mains-style power away from hook-up. That choice determines whether the system needs an Inverter Charger. Then add the appliances you actually use so we can calculate the battery demand.

Choose Yes or No before continuing. This is the main Inverter Charger requirement question.
For intermittent appliances, enter the approximate total run-time across the whole day rather than the time they are switched on at the wall.
0WhWh / day
0AhAh / day
0Wh230V battery-side use

The total is the sum of the appliances you have selected. For 230V loads, the calculation applies a 92% inverter efficiency allowance so the battery-side energy use is represented accurately.

How much battery reserve do you want?

Choose how much spare battery capacity you would like to keep in reserve. We’ll use this together with your daily power use and planned time off-grid to size the battery bank.

50%
The builder defaults to a 50% reserve for conservative planning and will not calculate below a 20% reserve. A further battery-sizing safety margin is applied automatically to allow for real-world variation, ageing, temperature and unexpected loads.
Battery requirement before recharge
0Ah

Based on your daily power use, time off-grid and selected reserve.

How will you recharge?

The charging architecture changes depending on whether you need off-grid 230V power. If an Inverter Charger is required, the SRNE MD1250 or MD12100 manages alternator and solar charging while the Inverter Charger handles hook-up charging. If no Inverter Charger is required, the SRNE SAA1250 3-in-1 combines alternator, solar and 230V hook-up charging in one unit. We also use your normal driving time to estimate how much energy the DC-DC charger can put back each day.

For conservative sizing, DC-DC recovery is based on the actual charging device selected and calculated at 75% of its rated alternator charge output. A 50A SAA1250 or MD1250 is therefore modelled at 37.5A, while a 100A MD12100 is modelled at 75A. We calculate Rarely as 0 hours, 1–2 hours as 1 hour, and 3–4 hours as 3 hours of DC-DC charging per day. Ah and Wh recovery figures shown below use the selected device, this 75% planning factor and a nominal 12.8V battery voltage. To stop recharge assumptions making the battery too small, no more than 50% of the calculated daily demand is credited back when sizing storage, and a further 15% battery-capacity margin is then applied. Actual charge rate varies with alternator output, battery state of charge, temperature and system limits.
Fit check uses the stated rectangular roof size and allows a 20mm gap between two panels. Rooflights, vents, rails, curvature and required mounting clearance can reduce the real usable area.
Choose No solar panel if you do not want roof-mounted PV. For planning, solar yield is estimated from panel wattage × 4 peak-sun-hours × 75% system efficiency. Solar package prices shown are panel-only; brackets, solar cable, connectors and protection are included in the installation hardware allowance below. With an Inverter Charger, MD1250 supports up to 700W PV and the 730W package steps up to MD12100. Without an Inverter Charger, SAA1250 is the all-in-one alternator + solar + AC charging solution up to 700W PV on 12V.
0Wh / 0AhEstimated DC-DC/day
0Wh / 0AhEstimated solar/day
0Wh / 0AhNet daily battery demand
0AhConservative battery capacity

How much control do you want?

Every recommended core component already gives you solid power management. The SRNE ecosystem can add central touchscreen control, accurate shunt monitoring and connected switching.

Compact / tidy install will never reduce the battery below the conservative calculated requirement. Maximum battery reserve adds further headroom above the normal conservative recommendation.

Ready to build your recommendation?

We’ll combine your appliance-by-appliance energy calculation, autonomy, reserve target, charging sources and peak load into an indicative SkyEnergi / SRNE system.

—Daily demand
—Peak 230V load
—Solar selected
—Conservative capacity

The result is a planning recommendation, not an installation specification. Cable cross-sections, fuse sizes, isolators, earthing, AC protection, battery mounting, PV arrangement and vehicle-specific requirements must be verified before purchase or installation.

Your recommended build

SkyEnergi Touring System

A balanced system for regular off-grid touring.

230Ah
SkyEnergi Core2 230AhDimensions: 384 × 194 × 255mm (L × D × H)Sized for your daily energy use and inverter charger demand.
0Wh / 0AhEstimated daily use
0Wh / 0AhFair-weather solar/day
0Wh / 0AhDC-DC recovery/day
0 daysIndicative autonomy*
Final installation should be checked by a competent installer.
Email this build to SkyEnergi

*Autonomy is an indicative energy balance only. Ah equivalents are calculated at a nominal 12.8V battery voltage. The load calculator applies 92% inverter efficiency to 230V loads, a small system-overhead allowance, estimated solar yield based on 4 peak-sun-hours at 75% system efficiency, and a conservative DC-DC recovery estimate using 75% of the selected charger's rated alternator output and the lower end of the selected driving-time range. Real performance varies with season, location, shading, alternator output, battery state of charge, temperature, travel pattern and appliance use. Prices shown are indicative including VAT at time of build and may change. The installation hardware figure is an allowance, not a fixed kit price; labour is not included.

SkyEnergi Core2 lithium105Ah to 680Ah, with Bluetooth monitoring and integrated heat-pad options across the Core2 range.
Smart charging architectureMD1250 / MD12100 with an Inverter Charger, or SAA1250 3-in-1 when no Inverter Charger is required.
230V mains chargingRIC12 Inverter Charger when off-grid 230V is needed; otherwise the SAA1250 provides integrated AC hook-up charging with no separate AC charger.
UK supportTalk through the result with SkyEnergi before ordering and turn the recommendation into a vehicle-specific bill of materials.