question

kevgermany avatar image
kevgermany asked

VRM Calculation Wrong

VRM is reporting incorrect figures. See screen shot. Same/similar numbers on CCGX.

There is no load on AC, despite what VRM says.

DC load is actually about 3-15W, one LED plus an Orion feeding a 12V battery at 1A. Fan is running on the Easysolar.

Numbers are usually reasonable, when there's no shore power.

Easysolar 24/1600

CCGX

Orion 24/12 (can't remember the amperage)

screenshot-20221020-084827.png


VRM
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2 Answers
marekp avatar image
marekp answered ·

@kevgermany

Those levels as so low that I am not surprised.

This "nonexistent" AC-out load could be the EasySolar's power draw.

AC-out loads are not measured but calculated.

I have seen systems without DC-loads but when DC-load was selected the values on VRM for it were positive.

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kevgermany avatar image kevgermany ♦♦ commented ·

Even so, I'm out by close to 150W

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Sarah avatar image
Sarah answered ·

Having a shunt installed as a DC energy meter to measure the DC load made a huge difference to the accuracy of this measurement on our boat.

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