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Solar Controller problem


By iFred, Section Controls
Posted on Tue May 24th, 2005 at 11:24:50 AM MST
Please help solve controller issue

Solar control Problem

I have 1kw of solar hooked to a xantrex 35amp trace controller charging batteries which then goes to an inverter. The problem is that once the charge controller is finished charging the batteries it just sits their and does nothing else. I would like to have that non charging power/current diverted to my hot water heater or some other load. The problem is that the xantrex controller can only do one function, charge or divert depending on wiring , so how can I divert if it's charging?

If it is charging then the wiring is good for only one thing, charging, which I assume means drain load from battery so the charger can keep up and maintain charging the batts. which is kinda silly when you think about it.. if your load is large and the sun goes down, your batts don't get fully charged while draining them. this is just to silly to think about.

If you wire it for diversion mode, then that's all it will do, and won't charge the batts.

This has to be the stupidest thing yet or I am missing something?

Of coarse I have to ask the silly question of why the manufacture didn't just put a simple relay or scr/triac circuit in place and an extra lug for connection for a diversion load, so that when it's done charging then it could simply divert the load, but nope, so such beast exists in any small charge controllers to date that I have seen, so why are they doing this and what am I missing???

Can I put a relay/scr/triac in circuit with the charge controller to do this? has it been done? The manual states that I cannot remove the charge without removing the load first.

Dazed and confused...

Thank you in advance for your replies and suggestions.

Solar Controller problem | 5 comments (5 topical, 0 editorial)

Re: Solar Controller problem (3.00 / 0) (#1)
by ghurd on Tue May 24th, 2005 at 06:58:54 AM MST
(User Info)

""If you wire it for diversion mode, then that's all it will do, and won't charge the batts. ""

My understanding, is that when the battery control V is reached, diversion mode sends the extra power to the diversion load. When the battery V drops, the diversion shuts off, and the battery charges.
That means the diversion load is not active until the battery is 'full'.

Charging mode just shuts off all the available power.

G-



Re: Solar Controller problem (3.00 / 0) (#2)
by pyrocasto (pyrocasto at hotmail dot com) on Tue May 24th, 2005 at 07:54:15 AM MST
(User Info)

I believe that's exactly how they work. The reason your charge controller even has a non-diversion load setting is because you dont need one with solar. It is handy to have so you can actually use your extra power, but not neccessary. Your panels will not spin out of control like your wind genny would, so it just opens the circuit.

Mine doesnt have a diversion load setting. This way, they are more simple to control and the average person doesnt have to worry about the other load.

[ Parent ]



Re: Solar Controller problem (3.00 / 0) (#3)
by fishfarm on Tue May 24th, 2005 at 09:12:19 AM MST
(User Info)

If your inverter does not have an auxiliary relay, you will need to use something like a voltage controlled switch. Solar Converters, Inc. makes one, there are probably others.



Re: Solar Controller problem (3.00 / 0) (#4)
by Nando (nando37-at-tx-dot-rr-dot-com Correct theanti-spam) on Wed May 25th, 2005 at 09:04:08 AM MST
(User Info)

iFred:

The solution is to add a detector to determine the charge controller behavior to turn a secondary load.

The circuit is simple but is difficult for me to tell you what to do because I do not know the Xantrex internal circuitry.

The easiest way is to detect the current being fed to the battery and once defined to a low value, like 2 or 5 % of the total, to turn the secondary load that could be a fixed load or a PWM with MPPT to maximize the harvesting of energy.

What is the battery bank and the solar panel voltages?

Regards

Nando




Re: Solar Controller problem (3.00 / 0) (#5)
by iFred (ifred2006@yahoo.com) on Thu May 26th, 2005 at 07:56:58 AM MST
(User Info)

Thank you for your comments. I understand what I have to do now. I'll scope out the controller and look for a full charge indication point. I beleive even the blinkin LED which goes solid might even do it, and would then trip a circuit to relays to divert. I think i got it now. Thanks!

>> all energy used to produce this comment or post came from solar and wind energy! It works!


Solar Controller problem | 5 comments (5 topical, 0 editorial)
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