Battery backup setup

colinhowlin
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Battery backup setup

Wed Mar 02, 2016 6:50 am

Hi

Looking to deploy a WS-12V-DC on one of our sites with a battery backup system in place.
New territory for me - how does everyone else do this?
What gear do you use as far as battery, controller etc are concerned?

Thanks
Colin

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rockhead
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Re: Battery backup setup

Thu Mar 03, 2016 9:24 pm

I reaaaaaly like AGM batteries as they are unspillable and will only off gas if massively overcharged. Samlex makes good simple reliable charge controllers, there are many more.

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sirhc
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Re: Battery backup setup

Thu Mar 03, 2016 9:30 pm

If using a WS-12-DC unit you need 48V +/- conditioned power.

The WS-12-250-DC unit will accept 9-60V unconditioned power.
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colinhowlin
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Re: Battery backup setup

Fri Mar 04, 2016 5:48 am

Thanks,

When you say it needs 48V+/- conditioned, I take it there is very little tolerance for voltage fluctuations?

So what's my shopping list!
I need something to take mains AC (240V), which will be used to primarily power the switch.
Batteries are for backup in case of mains failure.
Controller?
Rectifier?
Pretty clueless in this area.

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sirhc
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Re: Battery backup setup

Fri Mar 04, 2016 9:19 am

If you are on grid then I would do this:

Trip Lite 750 or 1250 watts inverter charger
They make 120V and 220V versions.
http://www.tripplite.com/products/power ... hgod-woOKQ

2 to 4 AGM 12V batteries
I use Optima Blue top
http://www.optimabatteries.com/en-us/pr ... hgodYXMFEg

I would use an AC powered switch not a DC switch since your on grid


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lligetfa
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Re: Battery backup setup

Fri Mar 04, 2016 10:20 am

I guess it boils down to how (un)reliable the grid is and how much offgrid runtime is needed. A UPS is simpler but will limit the runtime. Once power fails, you are babysitting it more than a DC site. A UPS may need additional monitoring to know when to ignore the alerts and when to act. Also depends on what mitigation steps are available. Do you drag out a genset? Shed load?

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