48 volt 210 watt panels Options for my diff parts

[gregmm]

I came across 36- new 210 watt panels that are 48 volt putting out 68 volt that were made in 2010 by a name brand company. they seem to be some sort of R/D panels as I can not find and info on them at all. I do have to install the connector boxes to them but all came with them... then I came across 70- new 48 volt batt back up batt modules that have eight 12 volt 9ah batt each in a nice metal box with plug in connectors.. so that would be 72 ah x 70= 5040 ah total.. so I am looking at the outback 3600 48 volt inverter x 2 . so I can grid tie then use the system if the grid goes down.. any ideas , as all the parts I have so far are on the odd side

[Naptown]

If these modules are to be placed on your home or an insured building make sure there is a UL or equal listing or certification and CE doesn't count.

[gregmm]

Panel cirts

I own my home free and clear and the panels will be on the ground also all panels have embedded s/n that when i call on them they show as 12 volt but are not that. And it does show ul listed , and has cirts.

i came across 36- new 210 watt panels that are 48 volt putting out 68 volt that were made in 2010 by a name brand company. They seem to be some sort of r/d panels as i can not find and info on them at all. I do have to install the connector boxes to them but all came with them... Then i came across 70- new 48 volt batt back up batt modules that have eight 12 volt 9ah batt each in a nice metal box with plug in connectors.. So that would be 72 ah x 70= 5040 ah total.. So i am looking at the outback 3600 48 volt inverter x 2 . So i can grid tie then use the system if the grid goes down.. Any ideas , as all the parts i have so far are on the odd side

[Naptown]

have a chat with UL or whatever listing lab they are certified with. I am getting mixed signals here. If they are listed for one voltage but producing another voltage there is something wrong with either the listing number or something else. Even if you don't have a mortgage you have much to lose with unlisted modules no matter how good the deal on them was. Think of a fire and no insurance coverage. This is worst case but within the realm of possibility with unlisted (read prototype) modules.

[gregmm]

All solar panels i have tested rate higher then what it is rateted for

have a chat with UL or whatever listing lab they are certified with. I am getting mixed signals here. If they are listed for one voltage but producing another voltage there is something wrong with either the listing number or something else. Even if you don't have a mortgage you have much to lose with unlisted modules no matter how good the deal on them was. Think of a fire and no insurance coverage. This is worst case but within the realm of possibility with unlisted (read prototype) modules.

All solar panels i have tested rate higher then what it is rateted for exergreen panels tahe are called by evergreen 12 volt but put out 21 to 22 volt output not under load.. the panels i have putout 66 to 68 volts, under no load.. it looks like this panel was never released for sale in the US. all are new all have s/n and were made less then 6 months ago. when I test for watt most put out 220 to 230 watt not under load..

[Mike90250]

All solar panels i have tested rate higher then what it is rateted for exergreen panels tahe are called by evergreen 12 volt but put out 21 to 22 volt output not under load.. the panels i have putout 66 to 68 volts, under no load.. it looks like this panel was never released for sale in the US. all are new all have s/n and were made less then 6 months ago. when I test for watt most put out 220 to 230 watt not under load..

To test for watts, you have to place a load on the panel!

Under no load, your voltage is correct, a slightly higher voltage, and then when proper load is applied, the panel voltage drops to it's rated voltage.

[gregmm]

I was told amps x volts = watts

I was told amps x volts = watts is this not true

[Mike90250]

amps x volts = watts
Measure open ckt voltage
measure short ckt amps
multiply, and take 10% off the result, and you will be very close

With homebrew gear, you cannot easily measure Vpmax or Ipmax

But there is no such thing as Watts under no load. That's like measuring MPG on a car sitting in the driveway.

[russ]

I don't know - thought my car got wonderful mileage sitting in the drive.

[gregmm]

The inverter i want

I came across 36- new 210 watt panels that are 48 volt putting out 68 volt that were made in 2010 by a name brand company. they seem to be some sort of R/D panels as I can not find and info on them at all. I do have to install the connector boxes to them but all came with them... then I came across 70- new 48 volt batt back up batt modules that have eight 12 volt 9ah batt each in a nice metal box with plug in connectors.. so that would be 72 ah x 70= 5040 ah total.. so I am looking at the outback 3600 48 volt inverter x 2 . so I can grid tie then use the system if the grid goes down.. any ideas , as all the parts I have so far are on the odd side

I AM LOOKING AT THE OutBack FP2-29 FLEXpower TWO, Pre-wired GVFX3648 Grid Tie Inverter/Chargers, Vented, w/Bypass, Mate2, HUB10 7200 WATTS HAS ANYONE USED THIS UNIT , IT WILL CHARGE MY BATT BANK WHEN HOOKED UP TO THE GRID BUT I HAVE TO BUY A DC SIDE CHARGER FOR WHEN NOT ON GRID, AND THE OUT BACK UNIT DC CHARGERS SEEM PRICEY ANY IDEAS ON A GOOD DC SIDE CHARGER. ABOVE IS THE SYSTEM I HAVE PUT TOGETHER.

[Mike90250]

All the Large 60-80A MPPT chargers from Xantrex, Outback, Morningstar and Midnight are in the ~$500 range. They all work well. You can buy PWM chargers for a lot less, but you loose a lot of power without the DC-DC conversion the MPPT does. There there is ebay and off-name brands which may only be 60% efficient, compared to the 95% big name efficiency. One tester reported a piece of wire has less loss, than a knockoff MPPT controller, it was so bad.