![]() you might still get that on those rare days at solar noon when it's very cold if the panels are tilted right (all other times you'll get less) and should size appropriately for it. So, even though you might never see 6,226 watts. So, in that case you'd have to size your gear for 4789 x 1.30 = 6226 Watts (~26 amps 240). For example, sunshine on snow (our Montana case) has a very high albedo, so you might see +30% power. That would be the maximum you need to size your gear on if it were a normal panel.īut, with bifacial panels you need to consider the albedo which gives the % bifacial increase. So, the most power that could be generated would be 3950x1.214 = 4,789 watts (~20 amps 240V). The temperature correction for your coldest day is -.36 %/C x (25 - (-34)) = +21.24%. If you had 10 panels it would be 395 x 10 = 3,950 watts. Say you live in Montana and the lowest recorded low temperature is -30F (-34C). If it were a normal panel, you're all set. This LG panel is rated for a maximum of 395 watts and a temperature correction of -0.36 %/C. I didn't see it in the datasheet for the product you mentions, so I grabbed some data from an LG datasheet as an example: And talk to the vendor on those 390w (500w) bifacialsĪpologies to have left you with that impression! No, it's like any other panel with just a plus/minus connector. So, if I have an array say at 4800 and a 4000 or 3800 GTI I should be okay?Īlso I read, from a 3800w GTI, once the DC goes over the rating of 3800.that's all you are going to get.Does say 4200 watts incoming from the panels hurt or overload the GTI.I wouldn't think so.īack to drawing board and research available PV panels to see if I can get over 4k wattage. From input here on the forum I can install a 4000w GTI, 17amp AC output or a 3800 GTI with 16.5amp AC output. I'm coming to the conclusion that 20 amp double at my sub panel in the barn is max. The bifacials at 390w on the front side (10 panels = 3900w (not including any gain from the backsides.maybe 300w-500w extra ?) Really don't want to buy 2 pole mounts ($3k) 12 panels watts =3600 (or 16 panels watts = 4800) I saw a pole mount that holds 6 panels (maybe 8). I am viewing ebay New ZNSHINE Solar Bifacial 500's, 72 split cell ($199 each +ship).With 3 diodes, Junction box IP68.I'll have to inquire if this is wired as one panel and not two.that would make a big difference. Stupid me.actually bifacials have to be wired twice? Because actually they are 2 panels.Now I am not seeing the gain. Max amps should be 20 amp or 30 amp correct? Would this be overloading my main house panel based on rule of 120?Ĭlick to expand.Thank you for the link SAM. So after all that.My question is: can the PV array (3-4KW) tie into the barn sub panel via a 20-30 amp double pole 240 volt breaker? The energy would then travel back to main panel and back feed at the 60amp breaker. That would then feed the main panel and offset some of our utilization. So configure it at the rack and then run a 40-50 ft #6 awg underground and tie into the barn sub panel. Also studying micro inverters (somewhat confusing) I like the SMA grid tie inverter 3800 that has a dc disconnect at the inverter. Why I am reviewing this, our PG&E bill used to be 100 -200 (300 summer) monthly now with more folks here we are at $408, $528 and this month is tracking for $580 this next billing cycle.ĭon't know whether to install a 2kw (and chip away at the monthly) or larger system 4-5kw (or shut it down during winter?) The house uses minimal electric.I have captured specs on what we use.Īround 42 amps unless we use the dryer at 18 amps.That includes freezer 3 amps, refrig 6.5 amps, gas oven 5 amp for igniter, microwave 13.8 amps, room A/C 11k btu at 10 amps.We have on demand lp gas water heater, gas stove, wood burning FP for winter. We have heavy usage right now because we are running both 13500 BTU A/C units with 1250 wattage each.The barn panel is fed 350 feet away sched 40 underground #4 three conductors #8 grnd but I installed a 60 amp breaker at the main service panel for the barn. Our barn has a GE 100 amp panel but minimal breakers. And wire a 20 amp double pole into the barn panel, maybe 30 if i could get away with that? I would like to install the 6 panel array 500 watt bifacial near the barn 40-50 ft away (clearest southern exposure). Newbie here.Reading about the rule of 120? A little confused. ![]()
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