Minimizing parasitic loads

I have an AC200MAX that I put on my boat, connected to the bilge pumps, because I’ve pulled the house and starter banks while I do some remodelling, and I don’t much care for the idea of a boat in the water without working pumps.

The bilge pumps are mechanically switched, and so draw zero power, unless I get enough water in the bilge to switch them, which has not happened.

I have the DC output on, it the AC output off. I was away from the boat for three days, and was surprised on my return that the state of charge was down to 20%.

The display shows 0 output. The pumps have not run, and there’s nothing but the pumps connected. The only drain should be the parasitic loads of the AC200MAX itself.

The AC200MAX is supposed to store 2048Wh. If it drains in four days, that’s 512Wh/day, or 21.3W. That’s close to 2A in parasitic load, and that seems a bit much.

Is that level of parasitic drain normal?

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@jdege Hi, could you please provide me with the SN and the firmware version of the AC200MAX?

That level of drain is normal for a larger unit like this. You are seeing the operational drain plus the regulated DC drain. You could add a solar panel to keep charged or keep your boat battery charged directly with a solar panel.

Hi, could you please provide me with the SN and the firmware version of the AC200MAX?

Model: AC200MAX
SN: 214000209233
DSP Version: 4005.07
ARM Version: 4030.12
BNS Version: 1010.07
HMI Versión: 6023.10

Adding one of the expansion batteries would double or better the stored energy. Would it also double the parasitic load?

No, the parasitic load is caused by the operation of the base controller. 10 watts over 4 days is 960 watt-hours.
Even a small solar panel (make sure it’s more than 12 watts) will help with that.