DIY - Sun 500W Grid Tie - Off Of Battery Bank Performance Test Part 1

[14103543280]

awsome!  thanx for the info

[rhandsom]

@14103543280 No problem, good fortune to you.

[14103543280]

did ur grid tie inverter ever burn up from connecting it directly to ur battery bank?

thanx

[rhandsom]

@14103543280 Thanks for your question. No, my grid tie is still running fine. With an internal fan blowing hot air out, and an external fan blowing cool air into and around the unit, it only gets warm to the touch. As for power, the unit is rated at 450W normal output power and 500W max output power so 470W for 4hrs is not going to kill it. The draw back to this method, is that the solar conditions must be favorable to use the batteries as a buffer and for rapid recharge. However, it does work.

[sparktastic1]

No sorry, your figures don't add up.

I have SUN-500G's and I know for a fact that at >400W output they are only about 77% efficient. So for a single SUN-500G to put out 450+ watts AC, the input power would be close to 600w! 600w at 24v is 25A not 13A.

For you to produce 450W AC with only 312w DC in (13x24v), your inverter would have to be 150% efficient. You could solve the worlds energy needs with that kind of technology lol.

[rhandsom]

@sparktastic1 Good observations and you are essentially correct. In subsequent videos I found afterwards that the unit peaks at 600w and not 500w as labeled. Thus the actual efficiency is around 79% (473w out / 600w in = .788). And yes, the unit draws 20+ amps from the bank, which is offset by the power coming in from the panels. The battery bank stores 6600w so the unit had max power to draw from and allowed it to peak on average 473w an hr. See verification series for more info, Thanks.