SRNE SAA 3-in-1 MPPT — The Ultimate All-in-One Charger for Campervans

Modern campervans and motorhomes often rely on three different ways to charge their leisure batteries: solar panels, the vehicle alternator, and 230V mains hook-up. Traditionally, this meant three separate devices — an MPPT solar controller, a DC-DC charger and an AC charger — plus all the wiring to connect them.

The SRNE SAA 3-in-1 charge controller simplifies everything. It combines MPPT solar charging, DC-DC alternator charging and AC mains charging into a single, compact unit designed specifically for RVs, campervans and off-grid systems.

SRNE SAA 3-in-1 MPPT DC-DC and AC charger unit

The SRNE SAA 3-in-1 charger combines MPPT solar, DC-DC alternator and AC mains charging in one compact unit.

What Is the SRNE SAA 3-in-1 MPPT Charger?

The SRNE SAA is a multi-function power management unit designed for 12V and 24V leisure systems. Instead of using three separate boxes, the SAA integrates:

High-efficiency MPPT solar charging from your roof-mounted solar panels.
DC-DC charging from your vehicle alternator while driving.
AC mains charging from a 230V hook-up or generator.

For van converters and RV owners, this means a cleaner installation, fewer components to mount, and a smarter way to manage every charging source feeding your leisure battery.

Three Charging Functions in One Box

1. MPPT Solar Charging

The SAA uses Maximum Power Point Tracking (MPPT) to extract as much energy as possible from your solar panels. MPPT adjusts to changing light conditions, making it especially effective in the UK’s mixed weather.

2. DC-DC Alternator Charging

When the engine is running, the SAA takes power from the vehicle alternator and delivers a controlled charge to your leisure battery. This is essential for modern smart alternators and for safely charging lithium batteries.

3. AC Mains Charging

On a campsite or driveway, you can plug into 230V hook-up and the SAA works as a mains charger, topping up your leisure battery without any external charger needed.

SRNE SAA 3-in-1 MPPT kit with solar panel and wiring

SkyEnergi offers SRNE SAA kits that include solar panel, cabling, fuses and mounting hardware for a complete installation.

Why the SRNE SAA Is Ideal for Campervans & Motorhomes

Simpler installations – one unit instead of three separate chargers.
Cleaner wiring – fewer cables, fewer failure points and a tidier electrical cupboard.
Space saving – crucial in compact campervan builds.
Smart charging logic – coordinates solar, alternator and mains so they work together efficiently.
Configurable for different batteries – including modern LiFePO₄ lithium leisure batteries.

Perfect Match for SkyEnergi Lithium Leisure Batteries

Pairing the SRNE SAA with a SkyEnergi lithium leisure battery creates a powerful, efficient and future-proof electrical system for off-grid use.

SkyEnergi lithium leisure battery integrated into campervan power system

SkyEnergi LiFePO₄ batteries integrate perfectly with SRNE SAA charging systems for high-performance campervan power.

With lithium’s fast charging and high usable capacity, the SAA’s combined MPPT, DC-DC and AC charging can keep your battery topped up whether you’re:

Driving between locations,
Parked on a campsite with hook-up, or
Off-grid relying purely on solar.

How the SRNE SAA Fits Into a Typical System

A common campervan setup using the SRNE SAA might look like this:

Roof-mounted solar panels feed DC power into the SAA’s MPPT input.
Vehicle alternator connects to the SAA’s DC-DC input via appropriate fuses and cabling.
230V hook-up socket connects to the SAA’s AC input through an RCD/MCB consumer unit.
The SAA’s battery output connects directly to the leisure battery via correctly sized cables and protection.
From the leisure battery, power is distributed to 12V circuits and, if fitted, an inverter.

The result is a single brain managing all charging sources, keeping the battery within safe voltage and current limits.

Integration with SRNE CU2 & RMA7 (Smart RV Ecosystem)

The SAA becomes even more powerful when integrated into the wider SRNE RV ecosystem, using the CU2 control unit and RMA7 touchscreen for monitoring and control.

View solar, alternator and AC charging in real time.
Monitor battery state of charge, voltage and current.
Control 12V outputs, lighting circuits and more via relays.
Access system data via Bluetooth and Wi-Fi using the SRNE app.

This combination turns your campervan or motorhome into a truly smart power system, with everything visible on a single screen.

Who Is the SRNE SAA 3-in-1 MPPT For?

The SAA is a great fit if you:

Are planning a new campervan or motorhome conversion.
Want to tidy up an existing system that currently uses separate chargers.
Run a lithium leisure battery and want fast, efficient charging.
Value a compact, integrated and professionally engineered solution.

Frequently Asked Questions

Do I still need a separate solar controller, DC-DC charger or mains charger?

No — the SRNE SAA is designed to replace separate MPPT, DC-DC and AC chargers by combining all three into a single unit.

Is the SRNE SAA suitable for lithium leisure batteries?

Yes. The SAA can be configured for lithium (LiFePO₄) charging profiles, making it an excellent match for SkyEnergi lithium leisure batteries.

Can I use the SRNE SAA with a standard lead-acid or AGM battery?

Yes. The SAA can also be set up for traditional lead-acid and AGM batteries. However, the best performance and lifespan benefits are seen when paired with lithium.

Do I need the CU2 and RMA7 for the SAA to work?

No. The SAA will operate as a standalone 3-in-1 charger. The CU2 and RMA7 simply add enhanced monitoring, control and system integration.

Explore SRNE SAA Systems at SkyEnergi

SkyEnergi is a UK supplier of SRNE RV products, including the SAA multi-function charger, control units and complete kits with solar panels, cabling and protection.

All systems are backed by fast UK delivery, expert technical support and long warranties, helping you build a clean, powerful and reliable campervan electrical system.