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Justin Tierney avatar image
Justin Tierney asked

Multiplus ii vs Converter Charging

passthru-converter.pnginverter-charger.png

This is in my RV. So the first picture is with charging of the multi disabled but the breaker for the converter on so it will do the charging. The multi ii 2x120 is newly added so I use to seeing the negative value when connected to grid power.

The second picture is with the converter breaker off and the multi set to do the charging.

Any thoughts as to why the converter shows negative (which I understand is providing power and I use to seeing) but the multi shows as consuming DC power when AC is connected? This seems like it'd be a loop. I know the DC power is a rough estimation, it just seems like a big difference.

Multiplus-II
inverter-charger.png (45.6 KiB)
passthru-converter.png (47.7 KiB)
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snoobler avatar image
snoobler answered ·

DC power is the bucket of stuff that's leftover between known loads (inverter) and known inputs (MPPT, inverter charging, etc.).


DC Power reports those "leftover" loads as a positive consumption. Since you are charging from an "unknown" source, it shows up as a negative "load."


The Multiplus is reporting it's charging to the GX, so the GX knows that this is charging and reports it as such. The converter is just shoving current through the shunt, and the GX has no idea what's going on other than there is more DC current flowing INTO the battery than can be accounted for by AC loads, so it shows up as a negative load.

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Justin Tierney avatar image Justin Tierney commented ·
ok that makes sense. It was just a test honestly because with no load or in float charging mode the AC in will show a -10w or -1.1a and my dealer said they weren't sure what that was so I didn't know if maybe there was a tie into the above question. Thanks for the response.
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