diy solar

diy solar

Thinking of a new panel purchase

Welshman

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Joined
Feb 8, 2022
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If i bought this 400w panel….would it be ok to run it on a renogy 20a mppt controller and a 12v 120ah agm battery. im also connecting up a 300w/500w max inverter for charging tools.

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400w / 12v = 33.3a, you're going to need a 40a MPPT controller to really utilize that panel.

AGM batteries, being a flavor of lead acid, are only good to about 50% Depth of Discharge (DoD) so that battery is only going to be good for 60Ah at 12v or about 720 Wh. Just to be aware that the inverter is going to have a few watts of draw 24/7 if it's just sitting there idle.

As long as you're aware of the limitations you'll be fine. :)
 
Last edited:
400w / 12v = 33.3a, you're going to need a 40a MPPT controller to really utilize that panel.

AGM batteries, being a flavor of lead acid, are only good to about 50% Depth of Discharge (DoD) so that battery is only going to be good for 60Ah at 12v or about 720 Wh. Just to be aware that the inverter is going to have a few watts of draw 24/7 if it's just sitting there idle.

As long as you're aware of the limitations you'll be fine. :)
The inverter will be switched off until needed, its just going to be sat in the shed until i need to charge tool batteries. Everything esle will be run off the 12v side….even a little dashboard heater, to provide a tad of warmth of im pottering down there in the colder months.

this is the specs of the battery

5E07DF95-09F1-4020-B414-A0951164D686.png
 
Yup, 60Ah or 720Wh before you start damaging the batteries. Fortunately there's really no limit on how many you can parallel or series connect.
 
Yup, 60Ah or 720Wh before you start damaging the batteries. Fortunately there's really no limit on how many you can parallel or series connect.
I doubt i will even discharge that much to be honest…….i may just get a 200w panel for now, so i can use the current renogy controller.

im currently running a tv and sound bar off a 500wh solar generator nearly all day when its sunny with a 100w panel up on the deck, as both use less than 50w an hour ( together )
 
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