Author Topic: solar charge help  (Read 611 times)

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Offline Pling

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solar charge help
« on: July 14, 2013, 07:27:46 AM »
Hoping someone can help me, I have recently installed a 200 watt solar panel mounted on my boat rack which runs through a 15amp controller.

Had the camper out in the driveway yesterday to do some work on it and noticed that over the day the voltage on the BM1 monitor went from 12.7v to 12.5v.

I checked with a voltmeter at the wires from the panel and was up over 14v but the wires to the battery were reading 12.5v, over the course of the day It doesnt seem like any charge was taken ???All the lights were on on the controller and the red light was flickering.
Before I used to hook up a portable solar and remember seeing results quite quickly on the BM1 monitor,  hoping someone can offer suggestions of how I can check that my new unit is working?

Any help is appreciated

Offline speewa158

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Re: solar charge help
« Reply #1 on: July 14, 2013, 07:37:30 AM »
Pling   Don't Panic help is on the way , somebodies not out of bed as yet  :cheers:

Offline KingBilly

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Re: solar charge help
« Reply #2 on: July 14, 2013, 08:20:23 AM »
Just looking at the photo, both wires from the panels are black.  You haven't connected them the wrong way around?

KB
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Offline Pling

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Re: solar charge help
« Reply #3 on: July 14, 2013, 08:34:05 AM »
Just looking at the photo, both wires from the panels are black.  You haven't connected them the wrong way around?

KB

Hi KB

The wires are 4mm solar cable from Jaycar, Im sure they are right but now that you say it I will have to go and check..........I have done dumber things!

Offline Pling

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Re: solar charge help
« Reply #4 on: July 14, 2013, 10:03:49 AM »
Ok after removing all the protective tubing and a million zip ties all the wiring is good.
The panel does have a lot of dust on it and even in the garage the red light is still flickering.
Am doing more work on the trailer today so will clean the panel and sit it in the sun and will take note of what happens on the monitor through out the day.


Offline sablesoft

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Re: solar charge help
« Reply #5 on: July 14, 2013, 10:15:34 AM »
Had the camper out in the driveway yesterday to do some work on it and noticed that over the day the voltage on the BM1 monitor went from 12.7v to 12.5v.

Hi Pling,

If your BM1 is connected correctly and the charge from the solar panel is going through the BM1 current shunt into the battery, then you will see a positive current reading if it is charging the battery or a negative reading if current is being drained away.   

How long is the lead from the solar panel to the battery ??

Ray
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Offline Pling

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Re: solar charge help
« Reply #6 on: July 16, 2013, 10:04:23 AM »
Hi Pling,

If your BM1 is connected correctly and the charge from the solar panel is going through the BM1 current shunt into the battery, then you will see a positive current reading if it is charging the battery or a negative reading if current is being drained away.   

How long is the lead from the solar panel to the battery ??

Ray

Thanks Ray,

I connected the solar direct to the battery, so I will swap this around.
I regards to length of the leads (4mm solar cable) are about 3.5 metres long, Im hoping the size of the wire is adequate???

Offline whatsa

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Re: solar charge help
« Reply #7 on: July 16, 2013, 11:03:24 AM »
Hi Pling,
You really need to have the bm1 monitoring everything
as...
your total AH will be messed up
the SoC bar is not only voltage so it will be messed up too

Go into ENG and reset the unit
ie change AH and save, go back in and set to old setting.
( you should do this again when fully charged then you will have discharge values from full)

It does a lot of calcs based on usage and residual voltage and stores this info
to give a more accurate state.

right now you must have a lot of discharged AHs
 
« Last Edit: July 16, 2013, 11:11:50 AM by whatsa »
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Offline Pling

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Re: solar charge help
« Reply #8 on: July 16, 2013, 11:20:17 AM »
Hi Pling,
You really need to have the bm1 monitoring everything
as...
your total AH will be messed up
the SoC bar is not only voltage so it will be messed up too

Go into ENG and reset the unit
ie change AH and save, go back in and set to old setting.
( you should do this again when fully charged then you will have discharge values from full)

It does a lot of calcs based on usage and residual voltage and stores this info
to give a more accurate state.

right now you must have a lot of discharged AHs

Yeah Thanks whatsa,

Obviously I have a bit more to learn about the BM1 and wiring for that matter ;D

Cheers

Offline whatsa

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Re: solar charge help
« Reply #9 on: July 16, 2013, 11:34:37 AM »
The BMs are easy

just a couple of simple things

Only bm shunt is connected to battery neg connector.

Do the reset at full charge then its easier on your head as AH discharge reflects usage from full and not a mid-point.

Thats it really
If you see a discharge charge occurring at idle - no loads on system ( without solar controller connected)

Then you can adjust that too in ENG - 4 presses to a .1v change to zero it out
( sorry thats 8 presses)
Cheers Owen
« Last Edit: July 16, 2013, 12:59:55 PM by whatsa »
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Offline Pling

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Re: solar charge help
« Reply #10 on: July 16, 2013, 11:39:12 AM »
The BMs are easy

just a couple of simple things

Only bm shunt is connected to battery neg connector.

Do the reset at full charge then its easier on your head as AH discharge reflects usage from full and not a mid-point.

Thats it really
If you see a discharge charge occurring at idle - no loads on system ( without solar controller connected)

Then you can adjust that too in ENG - 4 presses to a .1v change to zero it out

Cheers Owen


Owen,

The Solar is permanently connected to the camper does this matter at all?

Offline whatsa

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Re: solar charge help
« Reply #11 on: July 16, 2013, 12:18:21 PM »
Just connect it and see what the draw AH is

you could have a .1-.2 draw or almost nothing?

Up to you what you do

If you have a good regular maintenance cycle then you could leave in place


(I believe that one uses 10ma so should be fine connected but check anyway)

cheers


 
« Last Edit: July 16, 2013, 12:30:20 PM by whatsa »
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