I have a smaller unit that is 200w(250 peak) with 151 amp hrs. At 12 volts it equates to 4.1 amps for both, as mine is the same load as yours(16 and 30). If I am not mistaken, mine should work, but for a shorter time.

Thanks Mel, I just didn't want to damage anything.
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact