You want 10,000 watt hours at 12 volts you need a 833 AH battery. Capacity is the size of the TANK he referred to. So your installer comment is pure rubbish I can give you any amount of battery capacity you want at any voltage. With 48 volts you can grow up to 400o watts. Example above if using a 80 amp controller you are limited to 1000 watts max at 12 volt battery. Allows higher power inputs for a Charge Controller rating. This means it is more efficient because line losses are less.Ģ. The higher the voltage, means less current for a fixed power. To conclude operating at higher voltages give you too thingsġ. So the maximum panel wattage vs battery voltage is thus" For example the largest MPPT Charge Controller is 80 amps. What you are missing is the relationship of Power, Voltage, and Current. In addition all three example will receive the exact same charge rate of C/8, but that C/8 current is the same. So try all three and you will get 7680 Watt Hours. With respect to batteries battery Watt Hour Capacity = Battery Voltage x Battery Amp Hour. OK if you had a 1000 watt panel, the minimum size battery for a C/8 charge rate where C = the battery AH capacity isĪll three batteries above have the exact amount of energy expressed in Watt Hours. For example if you have a fixed panel wattage of 1000 watts and use a MPPT controller the maximum charge current vs battery voltage is: My understanding is the wiring of panels and batteries for 48 volts would halve the number of amps but would double the volts, thus provide roughly the same wattage. I'm confused, can anyone shed more light on this? So what I don't get is why would that cause the battery charging to become less efficient and cause me to have to double the # of panels? He said running at 48 volts is like doubling the size of a gas tank so you'd need twice the gas to fill it up (i.e. I asked why not do the 48 volt system as it is supposed to be more efficient however my installer said not as the charge side would be less efficient and I'd need to double the size of my solar array to 12 panels to get same charge effect. I saw the charge controller can do 24 or 48 volts meanwhile the XW4548 inverter at 48 volts is the same price as 24 volt inverter. My installer has me going with a 24 volt setup with a Xantrex XW4024 inverter and XW MPPT charge controller with six 235 watt panels. Am in the process of ordering parts for my off grid cabin system.
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