honda generator

Submitted: Wednesday, Mar 27, 2013 at 12:19
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Hi guy's does anyone have a comment to whether my honda 10ui genny will power a projecta 35 battery charger to my on board batteries in camper,input on charger says 1080w,cheers,Mike
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Reply By: member - mazcan - Wednesday, Mar 27, 2013 at 13:37

Wednesday, Mar 27, 2013 at 13:37
hi mike
so whats the output of that gennie its hard
to comment without the facts
cheers


AnswerID: 507672

Follow Up By: Mike S2 - Wednesday, Mar 27, 2013 at 14:10

Wednesday, Mar 27, 2013 at 14:10
honda 10ui is 1kva inverter type (1000w),seller says it will power charger but I'm unsure,maybe better off with 25a unit instead as some won't refund used purchases
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Reply By: Member -Pinko (NSW) - Wednesday, Mar 27, 2013 at 14:46

Wednesday, Mar 27, 2013 at 14:46
I have a ctek 25 amp charger and a 10i honda.
The honda puts out 8amps on battery charge circuit
I put the ctek into the 240v. outlet and run the honda on eco mode .
All is ok. have done this for 10 years.
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Follow Up By: Mike S2 - Wednesday, Mar 27, 2013 at 14:51

Wednesday, Mar 27, 2013 at 14:51
Thanks for that,I am hoping to go with the 35a but if not then 25a is what it is
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Reply By: Member - Frank P (NSW) - Wednesday, Mar 27, 2013 at 15:30

Wednesday, Mar 27, 2013 at 15:30
Mike,

The specs say the charger pulls 1080 watts for a 35 amp output. Your genny is 1000kVa, about 1000 watts. I think you'll be overloading your generator.

The 25 amp model pulls 792 watts. That should be ok.

Cheers
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Follow Up By: Racey - Wednesday, Mar 27, 2013 at 16:15

Wednesday, Mar 27, 2013 at 16:15
I agree the 25 is as big as yo want to go. The other option is select the 35 and set it to 25 amps, if and when you up grade the genny you will be OK.
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Follow Up By: Member - Frank P (NSW) - Wednesday, Mar 27, 2013 at 16:25

Wednesday, Mar 27, 2013 at 16:25
"Your genny is 1000kVa, about 1000 watts."

An oversimplification.

Some people will think this is BS, but it's not.

In AC appliances there is a thing called Power Factor (PF). It ranges between 0 and 1, the closer to 1 the better.

kVa= kwatts divided by power factor

If your charger rated at 792 watts has a power factor of 0.8, you need 792/0.8 = 0.990kVa to run it - pretty close to the 1kVa max for your generator.

A power factor of 0.8 or better is pretty common. Newer products should be getting better as designers push for better efficiency - you may be lucky with your Projecta. Give them a call and ask them what the PF is (it's not shown in the on-line specs) and do your own math.

Projecta is a reputable manufacturer. I would be surprised if the 25 amp model presents a problem but I think the 35 amp model is definitely a non-starter for you.

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Reply By: Ross M - Wednesday, Mar 27, 2013 at 17:29

Wednesday, Mar 27, 2013 at 17:29
G'day Mike
1080 eh, sounds a bit poisonous!

The Honda Eui 10 is around 800 watts constant.

If the charger you intend using is running at 14v and delivering 35 amps then that is around 500Watts being stuffed into batteries, probably won't be that much at that voltage however.

Given the charger will have a loss factor the 500 watts needed from the generator will be possibly around 600watts. Therefore you have plenty of reserve for continuous running.

The 1080 may be the initial surge at startup of the charger and that wattage won't be while running normally. The Eui10 started off ECO, and then switched to ECO when all is running and stable would seem quite possible.

Ross M
AnswerID: 507680

Follow Up By: Member - graeme W (WA) - Thursday, Mar 28, 2013 at 16:38

Thursday, Mar 28, 2013 at 16:38
Hi Ross.Thats what i do with my xantrax 40 amp charger using the same gennie. Start it off eco till the charger works out what % to charge at which is usually a lot less than 100% then i change to eco setting. Even with 240 volts availible at parks etc i find it easier to leave the charger connected via anderson plug to two auxillarys (165amp) and use 12 volt rather than run 240 to two fridges in the back of the ute. If enough sun the solar does the job.
cheers Graeme
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Reply By: Member - Frank P (NSW) - Wednesday, Mar 27, 2013 at 21:58

Wednesday, Mar 27, 2013 at 21:58
Mike,

I have a friend who has a Honda EU10i and had a 40 amp charger of a different brand to the one you're considering. The generator would not run the charger. The generator would go into overload as the charger started and cut off the power. The charger would shut down the generator would recover and the charger would try to re-start - with the same result. And so it would go until he switched everything off.

That particular charger, though otherwise very good, did not have an adjustable output, so he couldn't wind it down to reduce the load on the generator. The extra 5 amps capacity may have had something to do with it and also, being an older charger, the power factor was down around 0.8.

Ended up he got my 20 amp version of the same brand plus $100.00, and I got his 40 amp. (My genny is a Honda 2kVa and the two are fine together.)

By all means try the 35 amp charger, but make sure you can return it if your generator can't handle it. Many retailers will not accept returns on electrical goods, so beware.

Cheers

FrankP

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AnswerID: 507699

Reply By: The Bantam - Thursday, Mar 28, 2013 at 10:25

Thursday, Mar 28, 2013 at 10:25
As has been mentioned, people consistently have an over optomistic view of what their generators will deliver, and a similarly over optomistic view of what their appliances will draw.

To start with the generators the way they are generally specified these days will not deliver their plated rated output continuously...even as a resistive load with a power factor of 1.

So look at the specs of your generator....other have mentioned it may only have a 800Watt continuous rating on a resistive load.

Now consider if you will be getting any real benifit from this 35 amp charger.

Unless you have batteries in the 400AH range, you probably will not deliver 35 amps into you batteries for very long.

Notice that almost no current smart battery chargers have a AMP meter on em.

As the state of charge of the battery progresses, regradless of the type and capacity of the charger the charge current will reduce......

You may get very little if no advantage at all running a 35 amp charge over a 25.

SO...how much battery capacity do you have.

AND......which of these two devices do you already own .

cheers
AnswerID: 507721

Reply By: kevmac....(WA) - Thursday, Mar 28, 2013 at 15:48

Thursday, Mar 28, 2013 at 15:48
I run a 1kva Yamaha inverter gennie and breeze along with my 21amp Projecta smart charger, as well as powering the Engel at same time. When leading into darkness the occassional 240 light is on as well. Most of the time I run gennie in economy mode also
AnswerID: 507739

Follow Up By: kevmac....(WA) - Thursday, Mar 28, 2013 at 15:50

Thursday, Mar 28, 2013 at 15:50
The high current will only really be needed during boost charge anyways, as I see it.
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FollowupID: 785032

Reply By: Member - kwk56pt - Friday, Mar 29, 2013 at 15:59

Friday, Mar 29, 2013 at 15:59
I had a 4hp Honda coupled up to a 80amp alternator charging 2 x 100amp AGM batteries. I also had a clamp meter to see what amps were going in and I found it would quickly drop back to 35 amps and within usually 3 to 5 mins it would be only putting in 20 to 25 amps.
I now have a Ctek 25 amp charger and Yamaha 1000 Generator, Incidently the Yamaha in its eco mode runs slower and hence quieter than the Eu10 Honda I also had and being a smart charger it seems to charge up in about the same time as the alternator set up. Much quieter so my camping beighbours appreciate it also.I dont allow the batteries to go lower than 50 but mainly 60% so they will get a reasonable lifespan.
AnswerID: 507807

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