inverters ???

Hi all,I have a question for those electricaly mined people out there,I have a projecta 300 watt pure sine wave inverter in a newly aquired van which is supplied by 2 fully charged agm batteries.I also a have a sinergex 300watt inverter in my cruiser ,again pwered by 2 agm batteries.Now when I plug in my recharger for an 18v hitachi drill to recharge the drill battery the sinegex does it no problem .....but the projecta unit refuses to power the recharger and yet both inverters are 300watt. Can anyone explain why this is .

cheers Peter
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