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HardTopRog

Member Since: 13 Aug 2025
Location: Bristol
Posts: 4

How good is the Alternator? Ecoflow Alternator Charger

Hello.

I have an Ecoflow Delta 2 battery generator, which usually comes around with me in my current vehicle.

I'm waiting on the arrival of a D250 Defender Hard Top.

I'm looking into the Ecoflow Alternator to charge my Delta battery on the go.

Here is the product:
https://eu.ecoflow.com/products/800w-alternator-charger

In short, you attach the "Alternator Charger" to the battery terminals, and when the voltage of a running car kicks in, the Delta is charged using up to 800W via the car's alternator.

You can set it to turn off when the voltage reduces, thus not draining the car battery when ignition is turned off.

You can also reverse charge, so the Delta battery can top up the charge of the car's battery.

My question to anyone in the know:

How much resolve does the Defender D250 alternator have, can it handle the extra load?*

*The Alternator Charger can demand up to 74A draw from the alternator when it full whack (I believe this can be throttled, or the smaller 500w version can be used instead if the Defender Alternator can't handle it)
*Ecoflow states an alternator of above 150A is best suited to the alternator charger. Quick research suggests an A output rating is not quite so simple on the Defender alternator (I am about to deep dive, but if anyone can explain it's unique system in lamen terms, it could save me some time).

Thanks,

8th Sep 2025 1:58pm

TexasRover

Member Since: 24 Nov 2022
Location: Paris
Posts: 1322

2002 Defender 110 Td5 DCPU Chawton White

I suppose that depends on any other loads, because you will be using the spare generating capacity to charge your EcoFlow. All might be fine till you switch on the heated seats, windscreen, headlights etc.

As the load builds to a maximum, eventually the voltage will start dropping. Maybe your Alternator Charger devise will cut back on the amp draw if it detects it is pulling too much. There seems to be a fair bit of cleverness build into that box, maybe see if you can get hold of a technical data sheet.

Edit: In fact thinking about it, there must be a charge limitation because when your engine is idling the alternator will never provide full Amps. I doubt anyone will think it's a good idea to pull 75A on a cold morning when the engine just fired up..

8th Sep 2025 2:40pm

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