[RE-wrenches] Hydro Diversion Controls

[David Katz]

William,
That big of a load will look like a dead short to the hydro.  If you want to use the diverted energy, you need a load that draws just enough to pull the voltage down below charging voltage.  You only have 50 watt to control.  Get a 12 ohm 100 watt resistor or a 4000 watt 240 volt water heating element. That would draw 60 watts at 30 volts.
I would probably forget diversion and run it through an old C-40 charge control.  Have you measured the voltage from the hydro without a load?  If it is under 70 volts you could use a PV controller like the C40
How big is the battery?  You might not need control at all if it is a few hundred amp hours of flooded battery.
David Katz.

Sent from my HTC smartphone on the Now Network from Sprint!


----- Reply message -----
From: "William Miller" <william at millersolar.com>
To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
Subject: [RE-wrenches] Hydro Diversion Controls
Date: Thu, Nov 22, 2012 12:18 pm



David:

Interesting idea.  The added benefit is if the relay gets stuck, it won't
destroy the battery bank.

The diversion load must equal or exceed the output of the hydro,
correct?  The load we have will draw 38 amps at 24 vdc, the hydro will put
out 2 amps.  Sounds like I have enough headroom

Thanks again to all of you.

William

At 08:32 PM 11/21/2012, David Katz wrote:

>William,
>I always connect the hydro side of the diode to the diversion load with
>the contactor, so I don't pull the battery down while regulating.  The
>diversion load must draw enough current to pull the hydro voltage below
>the absorb voltage. Use ohms law to calculate the resistance.
>David Katz

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