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Old 09-25-2020, 06:53 PM   #1
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Exclamation What size charge controller should I buy?

I have a 2500 watt inverter charger, two 12v 200 watt solar panels, one 12v 400 watt wind turbine, and two 200ah AGM batteries, what size charge controller should I get? Will a 60 amp controller be enough?
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Old 09-25-2020, 08:53 PM   #2
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60A * 12V = 720W
200 + 200 + 400 = 800W

I'd rather have a controller capable of more than the input.
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Old 09-25-2020, 09:49 PM   #3
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Believe I would go with separate controllers for solar and wind turbine.
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Old 09-26-2020, 08:14 AM   #4
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Originally Posted by New2RV-ing View Post
I have a 2500 watt inverter charger, two 12v 200 watt solar panels, one 12v 400 watt wind turbine, and two 200ah AGM batteries, what size charge controller should I get? Will a 60 amp controller be enough?
I don't know much about wind.

A solar controller sized to match peak output is the minimum to harvest all the solar produced at peak output. 400 watt / 12 volts is 33 amps. Add a little for conversion loss. A bigger controller won't provide higher wattage than the panels produce.

The inverter charger sized to match what the battery bank is capable of absorbing when the bank is deeply discharged will be most efficient especially for some brands of AGM's. Check mfg. specs. This is especially important for genrator charging where you want to minimize charging time.

Legacy or Legend brand AGM's (I can't remember), give more life time discharge cycles when charged fast. Check battery mfg. specs. Possibly it was 20 amps per 100 amp hours of batteries. So, 80 amps or so. (This is not the same as the inverter watts. The charging circuits will have their own output rating.)

Generally speaking a small charger will work OK. It may take longer for deeply discharged batteries. A larger charger up to a point will decrease early fast charging time. Batteries have an absorption limit. A charger that is larger than the limit will not charge the bank faster.

I wish you good luck and happy trails ahead!
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Old 09-28-2020, 09:27 PM   #5
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If you're typical, you'll eventually graduate to more solar, and if you do, I'd suggest an MPPT Controller for anything over 400W. And, I'd get one rated at higher amps, so as to allow for more panels without having to - again - replace the controller with one that has more capacity.

I may have gone overboard, but I have 480W solar on the roof, and my former 30A controller only had about 4 amps to go before it couldn't handle the input. So, I replaced it with a 100/50 controller, in part because I don't have a 75 foot MH roof to mount enough solar to use it all up... but it DOES have enough to add a couple more panels at around 400-600W...

You can figure you'd gain about 5.2 amps for every 100W of solar, so might be worthwhile to do an inventory of typical daily wattage needs, and go from there...

X watts divided by 12 V = Y amps, then maybe add 25% for a buffer, energy loss, etc.
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Old 09-29-2020, 12:33 AM   #6
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Quote:
Originally Posted by New2RV-ing View Post
I have a 2500 watt inverter charger, two 12v 200 watt solar panels, one 12v 400 watt wind turbine, and two 200ah AGM batteries, what size charge controller should I get? Will a 60 amp controller be enough?
Thank ya'll for all the info!
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Old 09-29-2020, 02:36 AM   #7
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Might have a conversation with these guys. They can help to spec out what's needed.

https://www.continuousresources.com/...s-and-hardware
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Old 09-29-2020, 11:58 AM   #8
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Wind is more fickle than solar. Just thinking about it for a second, if the weather is such that your wind generator is anywhere close to rated output your solar panels probably won't be putting much out. Think thunderstorm, or tornado...

It's hard to get a wind generator up high enough to do much good. Better than nothing I guess but your solar will likely far outdo the wind generator over time.

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