Do I need a relay?

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Old 01-18-17, 11:25 AM
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Do I need a relay?

Trying to wire up a 600w at 12v heating element to a Selco OA-50 thermostat and battery bank so that I can give frost free water to our goats. The t-stat is rated 15A/10A at 110v/220v.. It will be wired to 2 L16 type 6v batteries charged by solar panels.

The heater is going to use 50A. I plan on using 10 Awg wire from batteries + to the + on element, then 10 Awg from - to one side of the t-stat, followed by 10 Awg to battery -.

Onto the question:
Will I need a relay in there for 12v @ 50A? It's not an expensive t-stat, but I would hate to burn it up.
If I do need a relay, I have no clue how to wire it up in this situation, so please dumb it down for me (i.e. SPDT or DPDT, what leads to what post, etc.).

Thanks in advance,
Ryan
 
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Old 01-18-17, 11:52 AM
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Welcome to the forums.

Selco OA-50..... closes at 32 and opens at 50.

Yes... you will need a relay and #8 wire

I would use a Cole Hersee 24059BP continuous duty relay. This looks like a starter relay but is completely different. A start relay can only be energized for a few seconds at a time or it will burn up.

Cole-Hersee-24059-BP-Insulated-Continuous/dp/B0064MX7US

Diagram to follow.
 
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Old 01-18-17, 12:14 PM
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Use #8 wiring for the heater wiring.
The wiring to the thermostat can be much smaller like #18.

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600 watts is a tremendous load and will need some big panels to overcome from.
 
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Old 01-20-17, 08:33 PM
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Thanks Pete! I will look into that. And I do have the solar panels to keep it charged. The good and bad about 100% off-grid.
 
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