Inverter 3 amp fuse/breaker

Toonces
Toonces Solar Expert Posts: 31 ✭✭
in Off Grid Solar & Battery Systems #1
I have a 300w morningstar inverter that requires a 3 amp AC fuse/breaker on the load side of the inverter. All I can find are DC breakers. Where am I going wrong on this? Thanks in advance!
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,613 admin
    edited October 2015 #2
    I am not sure why they have an AC fuse/breaker on the output. The inverter is capable of 600 Watts for 10 minutes and a 3 amp fuse is way too small--
    • 600 Watts * 1/110 Volts * 1.25 NEC wiring/Breaker deratings = 6.8 amp "recommended by me" wiring+fuse/breaker minimum rating
    Personally, I would not even bother to install one. The AC inverter will turn off way faster in response to an overload than any standard fuse/breaker.

    Your choice.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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  • zoneblue
    zoneblue Solar Expert Posts: 1,220 ✭✭✭✭
    #3
    Yes AC side breakers with inverters are more of a formality. They can be used to isolate the sub circuits is about all. Inverters are inherently current limiting... unfortunately. Would be quite cool if they delivered thousands of amps oaccionally but alas....
    1.8kWp CSUN, 10kWh AGM, Midnite Classic 150, Outback VFX3024E,
    http://zoneblue.org/cms/page.php?view=off-grid-solar


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