question

jack-reeves avatar image
jack-reeves asked

No real load. MPPT shows 500w daily. Normal?

screenshot-20210117-161709.pngHello. Just recently had to travel for a few days. Unplugged load from invertor but left panels connected via Victron MPPT to FLA batteries. Also had battery sense and battery safe connected.


When I returned I saw that each day seems to have used 500w. Is this normal and where does this energy go?

MPPT SmartSolar
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2 Answers
seb71 avatar image
seb71 answered ·

Wh, not W.

The energy went into your battery and also to power all devices you still have powered by the battery.

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jack-reeves avatar image jack-reeves commented ·

No I didn't turn the invertor off. Sorry yeah wh. I guess what I mean is if no ther systems are connected except 1000w invertor, MPPT, batterymonitor and batteryconnect is this use normal.seems my normal use is 1.6kwh so 550wh without anything seems high.

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seb71 avatar image seb71 jack-reeves commented ·

Let's say your inverter draws only 10W with no loads (but not powered off).

In 24 hours that means 240Wh.

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jack-reeves avatar image jack-reeves seb71 commented ·

Thanks for helping me home in my question. So is the wh displayed on the screenshot being used - it's not something displayed to keep batteries in good condition that doesn't really exist or something. Only have a small 1000w must invertor so 20w an hour feels like a lot of "leakage"

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lehrling avatar image
lehrling answered ·

You removed the load from your inverter but did you turn the inverter power off?

Inverters use a small amount of power even without a load.

Best practice might be to have a switchable breaker in the inverter power feed circuit.

Many places power could be going including battery as seb71 suggested.

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jack-reeves avatar image jack-reeves commented ·

No I didn't turn the invertor off. Sorry yeah wh. I guess what I mean is if no ther systems are connected except 1000w invertor, MPPT, batterymonitor and batteryconnect is this use normal.seems my normal use is 1.6kwh so 550wh without anything seems high.

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