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I noticed he wasn't from the US so I don't know if tripplite and APC are over there or not (I think they are both worldwide companies though). A lot of the lower cost brands don't run well for long times.We also had problems with old APC's in the 911 centers being too sensitive, when the center was running from backup power they would never switch off battery to line power because the generators, even the expensive clean power ones, were still too noisy. I would think car power would be close to as noisy, maybe not though.
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