Targa 40 Inverter

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LUNA

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Morning.. ive just fitted a 240v inverter as we dont have a genny.. its a quality piece of kit and done a neat job on install. But... just testing it all today and for some reason my charger ( SBC NRG 700 3 BANK 60 AMP ) " is this standard Targa equipment? " ) seems to make a buzzing sound when inverter switched on. i dont like it so i turn off quickly as dont want to kill my charger.

im lost why it would do this. i have turned off charger on trip switches so def no power going to it but it still does it. only way charger is connected is the buzz bar near batterys + - ( to charge them) inverter is connected to same place to power it .. :rolleyes:

any ideas .. working on it now and would like to try get sorted .. cheers all :encouragement:

pic of charger .. same one but 80amp vers . only pic i could find for min

K14oM95.jpg
 
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To answer your question about the charger, no, that's not the OE charger, which was a Jenelec JE/SM12-50.

What happens when you physically disconnect the inverter - does the charger still make the same sound? What size is the inverter?
 
The only thing i can think of is that the inverter is putting noise on the supply line at 50hz as it takes power.

I assume that the transformer output of the charger is in some way connected to the 12v supply even when off and it is buzzing.

Which we can all agree is odd!

Are you sure it is the charger, and not the inverter buzzing but bolted to the same panel? The charger may not be totally secured and it maybe the one then delivering the noise?

What happens when the charger is on?
 
jimmy_the_builder said:
To answer your question about the charger, no, that's not the OE charger, which was a Jenelec JE/SM12-50.

What happens when you physically disconnect the inverter - does the charger still make the same sound? What size is the inverter?
Click to expand...

ok cheers jimmy ..

yeah this charger seems nice bit of kit so dont want to kill it.. if disconnect or turn off inverter off this noise stops from charger straight away.. havnt left it on for any longer than say 5 secs because not sure if its doing any damage, its strange .. inverter is 2000w .
 
jrudge said:
The only thing i can think of is that the inverter is putting noise on the supply line at 50hz as it takes power.

I assume that the transformer output of the charger is in some way connected to the 12v supply even when off and it is buzzing.

Which we can all agree is odd!

Are you sure it is the charger, and not the inverter buzzing but bolted to the same panel? The charger may not be totally secured and it maybe the one then delivering the noise?

What happens when the charger is on?
Click to expand...

ok cheers. yeah does seem bit strange, ive had to pop out but going back down boat bit later to have a go.. yeah pretty sure its the charger , ive mounted inverter about a meter away from charger..

when charger is on 240 v shore power which it is 24 -7 its totally quiet.. no noises :ambivalence:

but turn it off totally.. even at trip switches.. turn on inverter charger makes weird noises which dont sound too healthy

i have a go later see what can find out
 
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LUNA said:
ok cheers jimmy ..

yeah this charger seems nice bit of kit so dont want to kill it.. if disconnect or turn off inverter off this noise stops from charger straight away.. havnt left it on for any longer than say 5 secs because not sure if its doing any damage, its strange .. inverter is 2000w .
Click to expand...

2000w is a hell of a big inverter for such a titchy battery installation as that on the T40 - the domestic bank is only two batteries, OE was 140Ah I think and about the max you can fit in there is about 180Ah I think. If your inverter rating is consumption then 2000w at 12v = 166A. If it is the output of the inverter then the current draw is way north of that, depending on inverter efficiency. I don't think your batteries will be up to it and so perhaps the noise you are hearing is the charger being overloaded, trying to keep up with the inverter.
 
jimmy_the_builder said:
2000w is a hell of a big inverter for such a titchy battery installation as that on the T40 - the domestic bank is only two batteries, OE was 140Ah I think and about the max you can fit in there is about 180Ah I think. If your inverter rating is consumption then 2000w at 12v = 166A. If it is the output of the inverter then the current draw is way north of that, depending on inverter efficiency. I don't think your batteries will be up to it and so perhaps the noise you are hearing is the charger being overloaded, trying to keep up with the inverter.
Click to expand...

Sorry its 1000 w cont power / 2000 w Peak . i wont be running anywhere near that, its only just for few bits while anchored up.. i just thought safer go bit bigger..

well the noises are without even running anything.. i literally turned off all 240v trips so nothing much really running in 240v apart from the leds on the main board.. so not drawing much .. charger off too.. then charger makes weird noises switched off ..
 
You would still pick it up through the line though. Sometimes a Pie filter may work but then you need to worry about mosfetts getting too hot.
 
Are you saying this noise happens when the charger is running on the invertor output?

If so that is not a situation you need or want to happen so it doesn't matter, just don't do it.

Sounds like the charger is a transformer style not switched mode & doesn't like the AC invertor output.
 
Forty_Two said:
Are you saying this noise happens when the charger is running on the invertor output?

If so that is not a situation you need or want to happen so it doesn't matter, just don't do it.

Sounds like the charger is a transformer style not switched mode & doesn't like the AC invertor output.
Click to expand...

no .. im saying before i switch inverter on i turn off all the 240v breaker switches that we wont use on inverter power ( battery charger / immersion heater etc ) turn on inverter .. works great ie laptop .. tv etc .. but the charger starts making a hissing sound and sounds like something is wrong
 
ive tryed figuring it out this evening..

still no luck. tryed disconnecting charger Battery cables .. only way is to physically disconnect the blue Neutral wire from junction box in engine room then its fine. noise gone.. :ambivalence:
 
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Ok I have just tumbled this

You are running the inverter. This is probably a modified sine wave variety.

You are now energising the 240v circuit with dirty 240v.

The charger turns on and off using an electronic switch not an actual switch. So when it is off it is not really off

The dirty supply is then causing it to buzz

The inverter should be installed in such as way that if can’t power the charger. You can’t use the batteries to generate 240v which the goes to a charger to charge the very same batteries that are powering the inverter

You should have a true dual pole change over switch anyway to change over the 240v. You should get one with 2 dual poles so you can also isolate the charger and given how it is installed it will never be possible for the charger to be on when the inverter is selected.
 
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