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Author Topic: UPS used on external battery bank 8hours our of 24?  (Read 9721 times)
martin W
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« Reply #30 on: September 08, 2013, 05:48:41 PM »

Thanks for the reply biff, I'll give that a try tomorrow if sun comes out to play... I guessed doing an equalisation charge (30v?) on sealed batteries was asking for trouble  Grin


Just reassessed exactly what I 'need' to run off the UPS. its a netbook which doubles as the server, printer (not used 22:00-05:00 so switched off then), router and a network switch. all 4 items use around 35watts total.

APC UPS700xl uses around 34 watts without a load / 44 watts with 10 watt load (running from mains). Interestingly its using around 1.1amp when running on the battery with no load, so I assume around 28-30 watts (26v on batteries).

I wonder if there is a cheap 100watt true sine wave inverter about will less of an overhead?
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marcus
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« Reply #31 on: September 08, 2013, 09:37:37 PM »

Quote
I wonder if there is a cheap 100watt true sine wave inverter about will less of an overhead?

do you really need pure sine wave? most things work fine on MSW (including computers and their power supplies), and MSW are cheaper and have less overhead.
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