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tealboy's avatar
tealboy
Explorer
Oct 17, 2018

How long will this battery last using inverter?

Ordered a new inverter, Wagan smart ac400,sells for appx $40 and is modified sine w .6 amp draw no load, rated 90 percent efficiency, full time fan and is said to run a true 400 Watts 24 hrs w surge t...
Ed_Gee's avatar
Ed_Gee
Explorer II
Oct 17, 2018
Rule of thumb: for 100W AC , the 12VDC current out of your battery would be ~ 10 Amps, so your 200W load would be drawing about 20 Amps from the battery. That gives you about 2 1/2 hours to reach the battery capacity half point where you should stop. If you run your battery down to 10.5 VDC more than once or twice you most certainly kill your battery.

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