Battery back up sump pump in OUTSIDE basin? Electrical question.

[TeamTruett]

I want to install a battery back up pump in my OUTSIDE sump pump basin. The brand I currently have as the primary is Zoller (US made) and I have been very happy with it and customer service. I would need to extend the power cords to go inside the house 25 to 35ft more so that the control box and battery is inside the house. Zoller tech support says some electricians can extend the exsisting 9ft cords, but Zoller doesn't recommend that. So are there any electricians here that can advise me? Zoller not recommending that is understandable since it's a "modification" but is there an issue with doing this?

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[nadogail]

My thoughts are; you need to consider the I squared R (Voltage Drop) over the extended cables. Extending the cables may cause your pump motor to operate in a "Low Voltage" condition with a risk of motor failure.

 

[redmondjp]

Do you know what the operating current of the pump is? As stated above, you are probably going to want to bump up the wire size to account for the voltage drop on the wire. Easiest/most cost-effective way to do this? Parallel two or more type UF 12-2 cables out to there. Make sure to weatherproof the connections inside the basin as you will have a lot of condensation/corrosion in there.

But I see you have A/C power already in the box - why not put your batteries in there?

 

[nh_yota]

I would just stick all that stuff in the pit.

 

[danfromsyr]

indeed
you already have 110v in the pit, I see no reason to put the other stuff in the basement.
the pit won't be as cold/freezing in winter. than a battery under a car hood.
you can put the control box in a better weatherproof casing to protect/preserve the charger electronics against humidity.
use good corrosion inhibitor on the electrical connections.
check and service quarterly. or at least bi-annually

 

[TeamTruett]

Ok thanks for the input guys. The easy way may be to just put it all in the basin. Perhaps build a shelf and mount it with tacom screws. I'll use dielectric grease liberally on all connections and put control box in a weather enclosure.