Battery Charger

[Tonks]

Hi all,
Can i run my 12 volt 15 amp 7 stage projecta intelli charge battery charger off a non inverter generator to charge a 105 amp deep cycle battery,

Cheers

[Cuppa]

I would think so. I can't see it damaging the charger, so try it & see. Monitor the charger & if you think it is getting warmer than usual turn it off, but I think it will be fine. In years gone by plenty of folk in the RV world charged their house batteries from a smart charger plugged into a modified square wave inverter powered from the crank battery/alternator, & I can't see that this is much different.

Cuppa

[Tonks]

Thanks Cuppa,

Will an 800 watt generator be sufficient enough to charge the deep cycle battery ?

[Cuppa]

Converting watts & amps between 240v & 12v confuses me, but I *think* that the charger should pull less than 2 amps (240v) at full charge & your 800w gennie can put out a bit over 3 amps.
Whilst travelling our alternator died & I kept a pair of 90ah batteries, paralleled with two N70 starters (24v system) charged with a ctek 24v 14amp smart charger (equivalent of their 25amp 12v model) & a 1Kva gennie for a few weeks. I don't think you'll have a problem unless it's one of those noisy & smelly 2 stroke gennies, in which case your neighbours, if you have any close by, may not be happy!

If you discharge your 105ah battery to 50% (approx before recharging, you would need to run your gennie for around 4 to 5 hours to bring it back to full charge. (the last bit takes longer).

A very rough guide to the state of charge of the battery is measuring the voltage across the terminals. There are many variables that affect the accuracy of this, but if the battery is allowed to stand, with no loads on it for 15 minutes or so, the reading will be close enough.

Cuppa

[trekster]

Use this calculator

http://www.supercircuits.com/resources/tools/volts-watts-amps-converter


Sent from my iPhone using Tapatalk

[Cuppa]

Use this calculator

http://www.supercircuits.com/resources/tools/volts-watts-amps-converter



Thanks,
So,
800watts @ 240volts = 3.3amps
and
180watts @ 12volts = 15amps
and
180watts @ 240v = 0.75amps

So when I suggested the 15amp charger would pull less than 2 amps @240v whilst pumping 15amps into the battery I was correct, but not very precise. In fact it would only be pulling 0.75amps@240v.

The generator would not even raise a sweat doing the job.

Cuppa

[Tonks]

Cheers Guys,
It all makes sense now.