MN3024DIY (Camper Install)

Started by Oldtimmer, May 10, 2022, 08:50:18 AM

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Oldtimmer

When the camper is connected to shore power little to no RFI.
When the shore power cable is plugged into the DIY.
Inverter on -  RFI on 80m is every 60hz
Inverter off â€" greatly reduced 
Solar panels connected and charging - RFI on 80m is every 60khz.
Solar panels disconnected -  greatly reduced
Unplug the shore power cable from the DIY and the noise is greatly reduced. 

Cable lengths
Solar Panel cable 10'
Battery cables 2'
120vac cable to 30a plug 2'

So it looks like I need to put some sort of chock on the shore power cable.
I will have to try  looping the cable.
I still have not figured out how to post pictures.

boB

Quote from: Oldtimmer on May 18, 2022, 05:04:17 PM
When the camper is connected to shore power little to no RFI.
When the shore power cable is plugged into the DIY.
Inverter on -  RFI on 80m is every 60hz
Inverter off â€" greatly reduced 
Solar panels connected and charging - RFI on 80m is every 60khz.
Solar panels disconnected -  greatly reduced
Unplug the shore power cable from the DIY and the noise is greatly reduced. 

Cable lengths
Solar Panel cable 10'
Battery cables 2'
120vac cable to 30a plug 2'

So it looks like I need to put some sort of chock on the shore power cable.
I will have to try  looping the cable.
I still have not figured out how to post pictures.


Sounds like you know what you are doing !

To post a picture, while editing, below the box you are typing in there is a "+Attachments and other options"
that you click on to upload your picture.   Probably no need for a picture yet though because you are describing things very clearly for the moment.

How about at night when it is inverting....  PV connected vs. PV disconnected ?    Then Shore power disconnected.

i.e. in the last case, all that should be connected to the inverter would be the battery wires and inverter AC output wires.

Sounds like the PV wires are certainly adding to the transmitting of noise.


boB 🌜


K7IQ 🌛  He/She/Me

Oldtimmer

Reverified that there is no RFI on shore power.
Little to no RFI with the inverter on and the PV connected or PV disconnected.
Also checked with the unit pluged into shore power at the ac input of the MN3024DIY with the camper shore power cable unpluged little to no RFI.
Only seem to have a problem when the camper shore power cable is pluged in and looping the cable did nothing. 
Thank you to all that have replied.
Jim 

boB


When you say you "looped the cable" earlier I assumed that you were looping it through a ferrite core of some sort.

What exactly does that mean ?  😁😁
K7IQ 🌛  He/She/Me

Oldtimmer

Just 2 turns 12" loop of the cable real didn't expect it to work and it didn't.
The shore cable is almost 3/4" in diameter.
That would require a larger ferrite core.
I guess I need to run 10AWG threw metal conduit to the campers breaker panel.

Oldtimmer

Ordered a Split Core Ferrite, 18 mm, 200 kHz, 30 MHz.
Will see if it reduces or eliminates the interference.

Vic

Hi Jim,

When possible, twisting cables together can reduce conducted emissions, quite a bit.  So, you might try twisting the shorepower AC conductors together, just several turns per foot,  Then, do the same with the PV leads to the DIY, and see that result.  And then, perhaps do a similar thing with the battery cables, if possible.

Twisting will effectively shorten these cables, and there is not always enough excess cable to do this.

Sometimes, having a few 2.4" OD toridial ferrites in type 31 materia (or, even larger outside diameterl, on hand can help.  These have gotten more expensive than they were, but they can be arrows, in your quiver, for emissions-fighting.

73   Good Luck,  Vic
Off Grid - Sys 1: 2ea SW+ 5548, Surrette 4KS25 1280 AH, 5.25 KW PV, Classic 150,WB, Beta Barcelona, Beta KID
Sys 2: SW+ 5548s, 4KS25s, 5.88 KW PV, 2 ea. Classic 150, WB, HB CC-needs remote Monitoring/Control, site=remote.
 MN Bkrs/Bxs/Combiners. Thanks MN for Great Products/Svc/Support&This Forum!!

Oldtimmer

A deferent issue on the DIY the PV output amps on the display reads about 3 amps higher then the battery amp input reads.
Other wise when the DIY reads 10A output the BMS reads 7A input.
Am I missing something here shouldn't they read the same?
 

FNG

I think that is MPPT out before powering any AC loads but I may be wrong

Oldtimmer

#24
That is with no AC load inverter is off.
Can't believe that the DIY would take 2.5 to 3 amps to operate but it may.

Vic

Hi Jim,

There is another DIY Topic.  There was some discussion here about Idle Consumption, FWIW:
http://midniteftp.com/forum/index.php?topic=5671.0

I know nothing, yet, of the DIY units, from personal experience.

Good Luck, 73, Vic
Off Grid - Sys 1: 2ea SW+ 5548, Surrette 4KS25 1280 AH, 5.25 KW PV, Classic 150,WB, Beta Barcelona, Beta KID
Sys 2: SW+ 5548s, 4KS25s, 5.88 KW PV, 2 ea. Classic 150, WB, HB CC-needs remote Monitoring/Control, site=remote.
 MN Bkrs/Bxs/Combiners. Thanks MN for Great Products/Svc/Support&This Forum!!

Oldtimmer

Well first weekend out dry camping.
MN3024DIY two thumbs up flawless operation.
DIY Lifepo4 24v 100ah Battery two thumbs up flawless operation.
PREDATOR 1400 Watt Inverter Generator - Connected to the DIY had to limit to 30a charge but worked grate.
Solar panels 335W 2 x 100W 1 x 135W not so good need more panels and mounted on the roof of the camper.
Did not take any radios this time out.
All in all things went well just need about 6 more panels and another 100ah battery and I will be set.
;D

boB

K7IQ 🌛  He/She/Me