My water heater is a 40 gallon tank. It runs 4500watts at 240 volts. I''m guessing that it''s on for an average of 4 hours a day. According to a map I looked at, I should have 4-4.5 hours of sunlight where I live. My latest figures are; I need a 4000w panel setup, and a 750Ah 48v battery system. This will leave roughly half the battery charge
Figure end to end efficiency of an off-grid solar PV system (solar panel to charge controller to battery bank to AC Inverter) is around 52% efficient (yes, you will only get 1/2 the power from your panel out the AC outlet you probably expected). 65 watt panel * 5.5 hours of sun * 0.52 = 185.9 WH per day (average)
Solar panels are more or less current sources (50% sun=50% torque). The LCB takes solar panel power at low current and fixed Vmp (=Vmp*I sun) and converts to high current & low voltage used to start the pump motor). Solar panels, when there is, at least, weak direct sun, run a constant Vmp and low Isun current.
Utilities buy power wholesale at roughly $0.02 to $0.10 per kWH (for base load power)--Solar/RE power is not worth $0.30 per kWH to a utility accountant/engineer. News I had not heard--Turns out China has put the brakes on Solar/Wind/RE power subsidies early in 2018. RE projects have to complete with all other energy sources without subsidies now.
P=V*I= 12 volts * 3 amps = 36 volts to fan. Say >4 amps at panel, and panel will produce 0-18+ volts. 18 volts * 4 amps = 72 Watts from panel (more than 36 watts for fan) 3 volts * 4 amps = 12 watts input to DC converter (less than 36 watts for fan) I am wanting to power a very small 12v brushless fan directly from a 12v solar panel (no battery).
Sep 18, 2023· First of all, you can''t connect a sink that requires a constant power, since the power of a solar cell is intermittent, due to the intermittency of the solar irradiation. 45W will be the peak
With a simple PWM 6 volt charge controller (or a direct connected panel), charging a 6 volt battery will reduce the panel''s "wattage" by about 1/2... For example (just guessing on the numbers). Assume 45 watt "12 volt panel" (actually, Vmp is ~17 volts for the typical panel). So: 45 watts / 17 volts = 2.65 amps
Solar hybrid gasoline generator, 7kw gas, 180 watts of solar, Morningstar 15 amp MPPT, group 31 AGM, 900 watt kisae inverter. Solar roof top GMC suburban, a normal 3/4 ton suburban with 180 watts of panels on the roof and 10 amp genasun MPPT, 2000w samlex pure sine wave inverter, 12v gast and ARB air compressors.
From what I have learned the AC supply from the Samlex inverter is 120V and not 240v and is not directly compatible with standard AC Main Panels and or Main Lugs without some small modifications. I wish to wire my small space with standard outlets and lighting for a small office. Currently my 600 watt solar array wired in series charging 4-6V
Remember, the length of wire is 2x the run length (both positive and negative wires). And, lastly, make sure you use appropriate sized fuses nearest the source of greatest power (i.e., close to the battery + bus). -Bill. Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset. ·Share on Twitter.
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