Meter that goes both ways - Page 2 - Ram Promaster Forum
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post #11 of 13 Old 06-17-2019, 10:34 AM
proeddie
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RD,


How about two of these, one on the wire from the solar to the batteries and on from the batteries to the loads.






Read the first review for some ideas.


Also, it seems to me that with a DC hall effect sensor, it can detect the direction of current flow and indicate positive or negative flow if connected to a meter that will display that. if looped around the ground wire, then a hall effect sensor would measure in/out flow, no? if there's current flowing in both directions, I would think you would read the "net difference" on a meter... ie. 20 A from the solar, 5A draw for loads, the meter should indicate 15A of flow (difference)




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post #12 of 13 Old 06-17-2019, 11:55 AM
nebulight
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I may have misunderstood your question by what you meant by "both ways". This question gets asked a lot on facebook groups about the ability to see consumption vs production. In a DC system with storage, if you wanted to be able to view production totals and consumption totals, then you would need two shunts or hall sensors: one on the charge side and one on the discharge side. If you are just looking for NET and don't care about seeing those numbers independently (ie I have 10 amps coming in from solar but am drawing 5 amps, then I have +5 going to the battery is all you'd see), than the one similar to what you linked will work for total net. I wouldn't suggest that specific model as that's a low current version and has a small 20amp shunt built into the unit. You'd need one with an external shunt or hall sensor for your high loads with the inverter. DROK makes a version with a 200amp shunt and it's actually wireless to the display. This is super helpful when installing in an already built out van should you have not access to run the wire. However I think they changed the design as it's not a box anymore:




They have a hall version still, it's not wireless, but it should work the same (note it installs on the positive wire) but I've heard calibration out of the box is an issue and can be a pain in the butt to calibrate properly as you'd need exact current to calibrate (a power supply is generally needed):

https://smile.amazon.com/Ammeter-DRO...gateway&sr=8-7

I'd see if you can find this version with a shunt. I can't find it on amazon and I think they are going to a new design.

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post #13 of 13 Old 06-17-2019, 01:38 PM Thread Starter
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Thanks all I am beginning to see that it is out there... now to decide.

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$500 solar and $700 complete Electrical: https://www.promasterforum.com/forum...ad.php?t=71562
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