A

1, Voc (open circuit voltage) 37.5.2V, it can be judged that it is a battery panel with 72 cells connected in series, and the corresponding output voltage should be 24V

< p> Therefore, the battery can only be used with 24V, and the same is true for the inverter

2. Two 260w solar panels generate electricity a day: 2*260*8 hours*effective power generation = 4000 watt hours

And 10 50W loads are used for 6 hours at night, 500W*6 hours = 3000 watt hours, which is enough

B

1. 48V is rarely used, so two Two battery boards are connected in parallel for use by 24V batteries.

The controller is 24V2*7.6A, so 15A--30A is acceptable. The price of 24V30A is 100--120RMB

2. The battery is 24V , 4000Wh/24V=167AH capacity, the battery selection is two 100AH

(or one 100AH ??and one 75AH in parallel, due to the low battery efficiency it is impossible to fully charge and discharge, so it is best to have two 100AH)

I am also using it. I choose 4 12V100AH ??batteries, 450RMB each, and connect every two in series and then in parallel

3. The inverter is 24V500W. Note that during inversion, the current of the DC terminal from the battery to the inverter wire is more than 20 A. Use wires of more than 6 square meters

If you also need to carry other AC loads, the inverter can be selected from 800W to 1200W. It is directly connected to the battery and has nothing to do with the controller, that is, it is connected in parallel with the controller on both sides of the battery.

The inverter has imitation sine wave or modified sine wave, which is very cheap, but can only drive stable currents such as light bulbs

If you bring a refrigerator, etc., because there is a motor compressor For large starting currents, you can only use a pure sine wave inverter

I bought a 1200W pure sine wave inverter. The manufacturer shipped a 24V one that I can’t use. It’s cheap. (kingwatt-com bought another 12V one)

4. Other equipment, such as the light-controlled switch TAOBAO, is available for 15 yuan each, suitable for 12---36V. . . .

For light bulbs, LEDs exceeding 7W are more expensive. You can use two 6--7W LEDs instead of 50W AC lamps, and the lighting will be the same

The 12V6W LED bulbs I use are priced on Taobao. For less than 30 yuan, you can connect two in series to form 24V.

Suggestion:

If you use 10 50w 220v bulbs, you can use 24V LED lights instead, which are brighter and more energy-efficient. It saves energy consumption, so the expensive inverter can be omitted