Giant Power Questions & Answers

Mine never ever reads 100%. The company say this is "normal" but cannot tell me why it doesn't reach 100, not can they tell me why it self discharges at an alarming rate or why it takes several hours to charge.

Sorry mate I cant help you, Aussie Batteries and Solar were so difficult to deal with I gave up, what I can say with absolute certainty is, the batteries they supply are substandard and I would never ever recommend dealing with the company or using their batteries.

Hey mate, talked to a friend he said that it’s normal and the charge will drop around 12.6 apparently that’s the full charge? And I’ve read reviews about these guys and the good way out the bad, I guess it’s one of those hit n miss things?

Sounds like you may have dropped a cell. ( 6 cells x 2.2 volts, fully charged 13.2 volts approx. Most likely cactus I'm afraid) Regards Rod

Take it to a battery place and see if they will do a load test on it. See if they do it for free. I took mine to an auto place and he did a state of charge test and said they were pretty good. Took them to a battery place and they were cactus.

Hi Noel, from memory they run a Daly BMS(battery management system) and can shut-down under certain circumstances Can be reactivated sometimes Biggest problem they don't have active cell balancing, and this can kill them. Read up on Daly BMW'S. I can't remember all the fault codes Hope this helps

hi, Mine is now doing the same thing, Did you find out how to fix yours? any tips? thanks,

I believe batteries lose 1-3% per month if not used /recharged. Double check that though. I know nothing about Lithium batteries. It makes you wonder do sellers of batteries have them on a charger every couple of months. If buying some batteries check the DOM (date of manufacture I assume). In the future I won't buy batteries that are older than 12ths from DOM.

I am not an expert, but its common knowledge that if you try to charge a lithium cell at low temperatures, the cell will be damaged. The Battery Management System "BMS" must have a thermocouple which reads the temperature of the battery. So if it is too hot, it will stop the battery functioning. And if it is too cold, it will stop the battery accepting a charge. This is a good feature and would be preserving your battery. Some Lithium batteries now have heaters inside them, to get around this problem. One way that might fix your problem, is to use the battery, presuming it has some charge left in it, which should warm the battery. When its warm, the thermocouple will also warm, and then the "BMS" will allow charge. Locating the battery another place might assist too, one where its warmer. I've not heard of 12V heaters, but one with a timer might work too ...

Best to charge the battery before use.

Read the Redarc charger manual to check settings. If you don't have the manual, Redarc has them online.

Thanks Ian will do The battery should read 13v fully charged ???

I *think* maximum charging current is about 20-25% of the available supply current, so you'd be pretty safe at 28 amps x 2 because in parallel = 56 amps. The batteries will still charge at lower current, but will take a little longer. Google is probably a better source of information rather than asking on Productreview.

I had 2 x 120Ah batteries and my charger was set on 21amps. I now have 2 x 140 Ah batteries. The charger I have can do 2 - 10 or 21 amps. If I put it on 10 and my fridge needs 6 then only 4 is going to the batteries.

I wouldn't be putting Giant Batteries under a car bonnet. They're not made for that type of positioning and/or heat. I would have thought that with any modern car, van or RV, you'd be hard pressed to find the space to fit them in the engine bay anyway ...

NO. Don’t use Giant batteries under the bonnet – far too hot. I suspect my Giant batteries failed last summer in Qld because my shed was too hot, and it’s well ventilated. Best wishes fr Mike of sth Queensland

The rated maximum temperature for Giant AGM batteries is 40 degrees C, fairly common for AGM. This is in their Specifications, at foot of product page. Fusion AGM is unusual : they are rated for under bonnet use. Staunchcell gel is rated to 60 degrees!! And 2000 cycles at DOD 60% (ie always remains 60 % full) Only $420!

I would hope you would be ok, if assuming thats an inverter draw. On the Aussie batteries site on the Giant 140Ah page at the bottom under specs, it say 1000A for 5 seconds, so you should be good at 50A each.

I hope this helps you out with charging time and rates :) external link . external link 

Yes, AGM batteries are still 0.3 kg per Amp. Nothing has changed except the over stating of battery capacities by retailers

Many things determine a batteries capacity, even AGM batteries. Even though Giant Batteries are Chinese, they are the bit better variety. I think what Giant is saying is that due to more modern manufacturing techniques, the 0.3Kg per amp, may no longer be applicable, depending on battery type - Flooded - AGM - Calcium - Lithium etc may mean it could come down to 0.25Kg, or maybe even 0.2Kg for very expensive ultra modern batteries.

I had 2 120 AH batteries and took to a recycling depot - weighed 62kg. Did this early this year and batteries only 2 yrs old.

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