Hi, I have 4 100w panels that are wired to a PWM controller. I would like to add a 100A Dc volt amp display panel + Shunt resistor 100A 75mV FL-2 to measure the volts and amps from the panels to the charge controller. I have tried googling but could not find a schematic to connect the meter. Anybody able to assist please.

It should be identical to your diagram. You just replace the battery with the solar panels +/-  

26 minutes ago, PowerUser said:

It should be identical to your diagram. You just replace the battery with the solar panels +/-  

Here is what PowerUser is saying:

I think the PV panels have to output less than 28V and I am not sure how they will like the startup voltage.

One could put this in the battery loop because PWM current from the panels is the same as the battery charging current... although it might blow up.

 

Thanks everybody. I will try read up about the start voltage for the meter. I will give it a go in the morning

Ok so I got the meter setup this morning. I have 4 100w panels connected and all seemed good for about an hour or so then the meter cut out. Think I might have blown it.

It was supposed to be 100v and 100A meter so wondering now???

 

 

 

Edited September 5, 20232 yr by Malcolm

3 minutes ago, Malcolm said:

Ok so I got the meter setup this morning. I have 4 100w panels connected and all seemed good for about an hour or so then the meter cut out. Think I might have blown it.

It was supposed to be 100v and 100A meter so wondering now???

 

 

 

Are your 4 panels in parallel? 

3 minutes ago, Scorp007 said:

Are your 4 panels in parallel? 

Yes they are in parallel

38 minutes ago, Malcolm said:

Yes they are in parallel

When they are self driven without a Aux supply the maximum volts can only be about 35V. When you want to use it for higher volts you must use the yellow and black wire that was not connected and wire it to a 9-18V separate Aux supply. 

For up to 60V and 100A you can try this meter which also accumulates Ah, kWh. Also keeps peak amps, peak Wh. These accumulated values can accumulate during the day and reset to zero when there is no power from the panel. 

Just one point. The Wh resets after about 580 and the Ah after 65 during the day.

Power can flow in reverse but no readings will show. Clear source and load prewired with short flying leads. 

Edited September 5, 20232 yr by Scorp007

1 minute ago, Scorp007 said:

When they are self drive without a Aux supply the maximum vts can only be about 35V. When you want to use it for higher volts you must use the yellow and black wire that was not connected and wire it to a 9-18V separate Aux supply. 

For up to 60V and 100A you can try this meter which also accumulates Ah, kWh. Also keeps peak amps, peak Wh. These accumulated values can accumulate during the day and reset to zero when there is no power from the panel. 

Just one point. The Wh resets after about 580 and the Ah after 65 during the day.

Power can flow in reverse but no readings will show. Clear source and load prewired with short flying leads. 

Thanks i will source a meter like this.

1 hour ago, Malcolm said:

Thanks i will source a meter like this.

Bottom left scrolls through all the values recorded while the other 3 are real time values. Handy to always see the Watts without the need for calculating it.