controller and converter sizes

by Brian
(Minneapolis MN)

Using your examples of 100W panels, can you also provide the formula for determining the amp size needed when buying a mppt?


Lastly, the relationship between battery capacity and the ac converter size that can be used?

12v at 75ah is 900 watts of which 540 (60%) is useable. Does that mean I can use a 500w converter?

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Feb 21, 2013
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by: Ric

"Using your examples of 100W panels, can you also provide the formula for determining the amp size needed when buying a mppt?

Lastly, the relationship between battery capacity and the ac converter size that can be used?

12v at 75ah is 900 watts of which 540 (60%) is useable. Does that mean I can use a 500w converter?"

Amp size for MPPT would be at max the watt size of your panels divided by 12 if you directly power off of them. Now if you use a battery you normally have a lot more amps to work with (500 cranking amps per battery or more) so you could run a very large inverter for a shorter time assuming you had a large enough wire. Lastly, I would go on up to a 750 or 1000 watt inverter, they are reasonably priced and your battery should run them just fine. Be sure to use the wire that comes with the inverter or heavier gauge, bigger the better when it comes to wire and an inline fuse wouldnt be a bad idea either ;)
Ric

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