Humm. I built a 4800 watt system that is only 1/2 operational. I've only mounted 1/2 my panels and I really have been hitting float about every day there is even a little sun. Mainly because I can fully charge my batteries in about 2-3 hours of any sunlight. So I'm wasting a ton of energy. Right now I'm only powering my server because I don't want to switch back and forth too much. More batteries will allow me to throw a few more of my servers on the system. But if I scaled this, the time to pay off will go down I think. Here are my figures:
12 | 400 Watt panels | $108.00 | $1,296.00 | ||
1 | Victron 150/100 MPPT charge controller | $547.81 | $547.81 | ||
1 | Victron smart shunt | $124.34 | $124.34 | ||
1 | Victron Phoenix 1200VA 48-volt 120v AC Pure Sine Wave Inverter (w/dongle) | $391.04 | $391.04 | ||
1 | Fueses | $39.62 | $39.62 | ||
1 | Bus Bar | $49.80 | $49.80 | ||
4 | Nermak 12v 100Ah LiFoPo4 battery | $199.99 | $799.96 | ||
3 | Ampper on/off disconnect switch | $13.99 | $41.97 | ||
1 | InstallGear 8 gague wire red/black | $55.11 | $55.11 | ||
1 | BougeRV solar y branch connectors (1 to 3) | $15.99 | $15.99 | ||
1 | WindyNation AWG 8 gague 100 ft red/black wire | $187.60 | $187.60 | ||
1 | ANLEMIN Car Battery Covers | $9.59 | $9.59 | ||
1 | 6in Asphalt Mini Rail With Flashing Roof Mount for Panel w/clamps | $450.00 | $450.00 | ||
| Total Cost: | $4,008.83 | ||||
| WH/day supplied: | 4000 | ||||
| WH/month supplied: | 120000 | ||||
| KWH/month supplied: | 120 | ||||
| Cost per KWH from electric company | $0.13 | ||||
| Total cost of electricty produced: | $15.60 | ||||
| Months to pay off: | 257 | ||||
| Years to pay off: | 22 |
I think all the numbers are correct. Feel free to correct me if I got something wrong.
My batteries can only hold 4.8kWh so, even if I drained them every night (which my server gets pretty close to doing. I make it to 8am with about 30% SOC), I couldn't use what I produce.
