Best Xantrex Technologies 804-0450 High-Wattage 40-Amp Battery Charger Deals

Customer Ratings:

I have been testing battery chargers and batteries for charging efficiency as a byproduct of marine wind turbine testing I am doing. Of the 5 different chargers I tested, this was by far the most efficient.

It is also very powerful; for just a little more than a standard 15 amp charger, you get 40 amps. The 3 stage charging program significantly speeds charging of large capacity batteries.

I bought 1, used it for several months, and was so impressed, I bought a 2nd one to boost the charging capacity of a very large batter bank.

It is ideal for use as a charger for boat battery banks, either cruising sailboat or for bass boat type trolling motor battery banks.

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I really like this charger but it has a major flaw.

The good points are that it provides a lot of current and it's very lightweight. You also get a constant current charge. If you set the charger for 20 amps you get a full 20 amps until the battery is near full charge and then the charger switches to a voltage mode and the current slowly decreases as the battery is fully charged. Very nice.

The major flaw is that you can't charge a completely dead battery. If the voltage is less than 4 volts, the charger is programmed not to work. How stupid is this? Somebody left a light on in my boat and drained the battery. I couldn't charge it. I had to get out my old "stupid" charger and get the voltage up before I could use the Xantrex. So which charger is really stupid?

Since this charger is "smart", it could simply run a few amps through a completely dead battery for a few minutes to see if the voltage comes up. If it does then continue with a normal charge and if it doesn't then give it up. Xantrex needs to re-program.

Best Deals for Xantrex Technologies 804-0450 High-Wattage 40-Amp Battery Charger

Being a commercial fisherman I've dealt with many charges and this is the best portable one I've ever used. The design quality is excellent but the build quality is only fair since it's made in China, you might get a bad one. I had to take mine apart and reposition the control panel because it was shifted to far up and you couldn't see the indicator lights. Charges a full 40 amps and I've had no problems with it for 6 months. A completely dead battery won't charge until you either zap it for a second with jumper cables or use an old style charger for a few minutes. The 3 charging stages work as described.

Honest reviews on Xantrex Technologies 804-0450 High-Wattage 40-Amp Battery Charger

Works well, but sometimes the smarts are not smart enough. Some times it charges a full or nearly full battery at too high an amperage and you know it shouldn't. You turn if off then back on, and it acts properly. Sometimes it won't charge a battery in bad shape, but a simple & stupid charger will. I'm on my second. The first would go into equilizing mode by itself, though the engineers at Xantrex couldn't see how that was possible! All in all it's a nice device and a worthwhile purchase.