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Forum Index : Electronics : DC to DC converter
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| charlie_ruizpr Newbie  Joined: 08/07/2010 Location: Posts: 36 |
Hi, I was giving a UPS of 1600 watts that is 48v and one the is 490 watts that is 24v and plan to use a 24v battery bank, would it be possible to use a DC to DC converter from 24v to 48v to charge the 1600 watt UPS that is 48v? DC to DC converter DC to DC converter 
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Hi Charlie Not easily. You would need a converter rated at at lease 1600 watts, more to allow for losses and surges. Those listed on eBay are only good for 100 watts, so you would need about 20 of them wired up in parallel. Not pratical. I was going to suggest keep the 24V 490Watt inverter as a backup and wire your system for 48 volts, but I see you already have a 24V 2500watt inverter in there. I would see if you can sell the 48V 1600watt UPS on ebay, it would suit someone with a 48V system so should sell. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| charlie_ruizpr Newbie Joined: 08/07/2010 Location: Posts: 36 |
But wouldn't the dc to dc converter charge the maybe 10ah battery at 48v with a charge controller? |
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| charlie_ruizpr Newbie Joined: 08/07/2010 Location: Posts: 36 |
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| Gizmo Admin Group Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Well yes, but what are your trying to achieve. You have a 48V 1600 watt UPS, did you want to use it as a 1600 watt supply, or a 50 watt supply? A 10ah battery would last about 5 minutes on a 1600watt inverter at full load. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| charlie_ruizpr Newbie Joined: 08/07/2010 Location: Posts: 36 |
I do not kno exactly the ah's of the batteries but I wanted to use it because I have seen people use them on youtube and thought that it can be used with a dc to dc converter and a charge controller. Would using an mppt charge controller work well with this? |
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| Warpspeed Guru  Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
If this is for operation of only one very infrequently used appliance, say for example a washing machine or a microwave oven, then short term intermittent operation with fairly lengthy recharge periods may be quite practical. One possibility would be to reconnect the internal UPS battery for 24 volts, and place it in parallel with the main battery for charging, and in series with the main battery for powering the UPS at 48 volts. That would effectively double the Ah capacity of the internal battery. Cheers, Tony. |
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| charlie_ruizpr Newbie Joined: 08/07/2010 Location: Posts: 36 |
i do not understand how to set this up the way you are saying |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
The basic idea, is that there will a 24 volt battery inside the UPS, which could be the original four twelve volt gell batteries reconnected to make it a 24 volt battery. To recharge this 24 volt UPS battery, it just needs to be connected directly across the 24 volt main system battery when the UPS is switched off. To run the UPS at 48 volts, you just connect the 24 volt UPS battery in series with the main 24 volt battery to get the required 48 volts when the UPS is switched on. Cheers, Tony. |
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| charlie_ruizpr Newbie Joined: 08/07/2010 Location: Posts: 36 |
oh ok thanks people great help |
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