Inverters

Fronius Automatic Backup Controller

£ 575.73GBP · price may vary

Model: FR-4.240.048.CK
Specifications: 1

MPN4,240,048,CK

Overview

The Fronius Automatic Backup Controller enables automatic backup for up to 35A per phase, ideal for essential loads. DIN rail mountable for compact, integrated installation. 35mm DIN rail mountable 35A

Specifications

MPN	4,240,048,CK

What these specifications mean

Fronius Automatic Backup Controller is listed with 1 published specification from Fronius, including MPN of 4,240,048,CK. Those figures are what decide whether this unit fits your system, so read them against the equipment it will connect to before comparing price.

For an inverter, the figures that matter most are surge or peak rating, which covers the brief inrush of motors and compressors, maximum PV input and the number of MPPT trackers, which set how many panel strings you can connect, the MPPT voltage window, which decides how many panels go in a string and peak and weighted (European/CEC) efficiency, typically 96–98.5%. It is the component that decides what a solar system can do: how much power you can draw at once, whether you can export to the grid, whether the system keeps running in a blackout, and how well the panels and battery are managed day to day.

What to check before ordering

The checks below apply to any inverter. Run them against the specification table above — most disappointing solar purchases are compatible-on-paper units that fail one of these in practice.

Look at the warranty term and what it covers. Five years is the common baseline, ten is offered by stronger brands, and extensions are often cheaper bought with the unit than later.
Size the inverter against the loads you need to run simultaneously, not against the total wattage of every appliance in the building — a 5 kW inverter comfortably runs a fridge, fans, lights and a couple of ACs, but not all of them plus a water pump starting at the same time.
Keep the panel array between roughly 1.0 and 1.3 times the inverter's rating. Slight oversizing (a higher DC-to-AC ratio) captures more energy on cloudy mornings and winter days; going far beyond it wastes generation through clipping.
Check the surge rating if you run motors — deep-well pumps, compressors and older air conditioners can draw two to three times their running current for a few seconds at start-up.

Common mistakes

Overlooking the IP rating. An outdoor installation needs at least IP65; indoor-rated units mounted outside fail early.
Buying on peak-watt price alone. A cheap inverter with a narrow MPPT window forces awkward string layouts and can strand a portion of the array.
Ignoring the ambient temperature rating. Inverters derate in heat, so a unit rated 5 kW at 25 °C may deliver noticeably less on a hot roof-adjacent wall at 45 °C.

Price and availability

Fronius Automatic Backup Controller is listed at £ 576 (GBP). Solar pricing moves with supply, import duties and exchange rates, and distributors set their own margins, so treat this as a comparison reference and confirm the current figure before you order.

SolarBazaar compares equipment rather than selling it. Shortlist here on specification and price, then buy from an authorised distributor or installer in your country: warranty cover on solar hardware is normally honoured through the channel you bought from, so confirm who supports Fronius locally before ordering.

Fronius Automatic Backup Controller — frequently asked questions

How much does Fronius Automatic Backup Controller cost?

Fronius Automatic Backup Controller is listed at £ 576 (GBP). The figure is indicative — solar prices move with supply, duties and exchange rates, and each distributor sets its own margin — so confirm the current price with a supplier before ordering.

What are the specifications of Fronius Automatic Backup Controller?

We hold 1 published specification for this inverter, including MPN 4,240,048,CK. The full table is on this page, listed under model FR-4.240.048.CK.

Who makes Fronius Automatic Backup Controller?

Fronius Automatic Backup Controller is a Fronius product, listed under inverters with model reference FR-4.240.048.CK. The Fronius brand page lists the rest of its range so you can compare across the catalogue.

Is Fronius Automatic Backup Controller right for my system?

That depends on what it has to connect to. For an inverter, check topology — on-grid, off-grid, hybrid or micro, continuous AC output in kW, which caps the load you can run at once and surge or peak rating, which covers the brief inrush of motors and compressors against the rest of your equipment before price enters the decision. Look at the warranty term and what it covers. Five years is the common baseline, ten is offered by stronger brands, and extensions are often cheaper bought with the unit than later.

Where can I buy Fronius Automatic Backup Controller?

SolarBazaar lists and compares equipment rather than selling it. Use the specifications and price here to shortlist, then buy through an authorised distributor or installer — buying in-channel is what keeps the manufacturer's warranty valid.

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